阅读说明：本技术 一种热连轧机组单面不锈钢复合板的生产工艺 (Production process of single-sided stainless steel composite plate of hot continuous rolling unit ) 是由 张华伟 焦四海 王治宇 于 2020-04-21 设计创作，主要内容包括：本发明公开了一种热连轧机组单面不锈钢复合板的生产工艺,将普碳钢基板和不锈钢复板组坯后经复合法制备成单面不锈钢板坯；再通过将单面不锈钢板坯经过加热炉加热、粗轧、精轧、层冷以及卷取等工艺,制成单面不锈钢复合板。本发明的热连轧机组单面不锈钢复合板的生产工艺,通过热轧工艺过程控制,充分利用现有的轧制设备,在常规热连轧机组上实现了单面不锈钢复合板的直接热轧,生产的单面不锈钢复合板复层厚度均匀,轧制过程稳定,基层与复层完全结合,未出现分层现象,避免了轧制、层冷、卷取过程的翘扣头废钢问题,解决了组织性能之间的矛盾,同时可实现单面不锈钢复合板的连续、大批量生产。(The invention discloses a production process of a single-sided stainless steel composite plate of a hot continuous rolling mill, which comprises the steps of assembling a common carbon steel substrate and a stainless steel composite plate into a blank, and preparing the blank into a single-sided stainless steel plate by a compounding method; and then the single-sided stainless steel plate blank is subjected to the processes of heating by a heating furnace, rough rolling, finish rolling, layer cooling, coiling and the like to prepare the single-sided stainless steel composite plate. According to the production process of the single-sided stainless steel composite plate of the hot continuous rolling mill set, the existing rolling equipment is fully utilized through the control of the hot rolling process, the direct hot rolling of the single-sided stainless steel composite plate is realized on the conventional hot continuous rolling mill set, the thickness of the produced single-sided stainless steel composite plate is uniform, the rolling process is stable, the base layer and the composite layer are completely combined, the layering phenomenon is avoided, the problem of warping and buckling head scrap steel in the rolling, layer cooling and coiling processes is avoided, the contradiction between the structure performance is solved, and meanwhile, the continuous and large-batch production of the single-sided stainless steel composite plate can be realized.)

1. A production process of a single-sided stainless steel composite plate of a hot continuous rolling unit is characterized by comprising the following steps:

s1, preparing a single-sided stainless steel plate blank, assembling the common carbon steel substrate and the stainless steel clad plate, and preparing the single-sided stainless steel plate blank by adopting a compounding method;

s2, heating by a heating furnace, and feeding the single-sided stainless steel plate blank prepared in the step S1 into the heating furnace for heating after steel loading;

s3, rough rolling, namely, after descaling through a descaling box, feeding the single-sided stainless steel plate blanks heated and discharged from the furnace in the step S2 into a rough rolling mill group for rolling;

s4, finish rolling, namely, descaling the single-sided stainless steel plate blank rolled in the step S3 by a descaling box, and then feeding the single-sided stainless steel plate blank into a finishing mill group for rolling;

s5, cooling;

and S6, coiling.

2. The process for producing hot continuous rolling mill train single sided stainless steel composite plate according to claim 1, wherein in step S2,

when the single-sided stainless steel slab is used for loading steel, the stainless steel surface is arranged on the lower surface, and the carbon steel surface is arranged on the upper surface;

when the heating furnace is used for heating, the temperature of the lower surface of the single-sided stainless steel slab is higher than that of the upper surface, and the temperature difference is 0-50 ℃;

the in-furnace time of the single-sided stainless steel plate blank is more than or equal to 150min, and the discharging temperature is 1100-1270 ℃.

3. The process for producing the single-sided stainless steel composite plate of the hot continuous rolling mill train according to claim 2, wherein the tapping temperature of the single-sided stainless steel slab is 1180 to 1240 ℃.

4. The process for producing hot continuous rolling mill train single sided stainless steel composite plate according to claim 1, wherein in step S3,

during rough rolling, the side pressure of a large side press in a rough rolling unit is less than or equal to 80mm, and the side pressure of a vertical roll is less than or equal to 35 mm;

the rolling speed of the upper roller of the working roller of the roughing mill set is lower than that of the lower roller.

5. The production process of the single-sided stainless steel composite plate of the hot continuous rolling mill set according to claim 4, wherein the single-sided stainless steel plate blank is subjected to rough rolling in multiple passes, and the rough rolling pass is more than or equal to 4 passes.

6. The process for producing the single-sided stainless steel composite plate of the hot continuous rolling mill according to claim 4, wherein the large side press in the roughing mill is empty, i.e. the side pressure of the large side press is 0 and the side pressure of the vertical roll is 10-35 mm.

7. The process for producing hot continuous rolling mill train single sided stainless steel composite plate according to claim 1, wherein in step S4,

the diameter of an upper roller of a working roller of the finishing mill group is less than or equal to that of a lower roller;

the finish rolling temperature of the finish rolling is 910 +/-60 ℃.

8. The process for manufacturing a hot continuous rolling mill train single-sided stainless steel clad plate according to claim 7, wherein, in the finish rolling, water sources except for the cooling water of the rolls of the finish rolling mill train and the water spray at the rear side of the last stand of the finish rolling mill train are turned on and the other water sources are turned off.

9. The process for producing a hot continuous rolling mill train single face stainless steel composite plate according to claim 7, wherein the finishing mill train is opened with only surface water during finish rolling.

10. The process for producing a hot continuous rolling mill train single-sided stainless steel composite plate according to claim 7, wherein the finish rolling temperature of the finish rolling is 910 ± 30 ℃.

11. The process for producing the single-sided stainless steel composite plate of the hot continuous rolling mill according to any one of claims 1 to 10, wherein in the step S1, the common carbon steel substrate and the stainless steel composite plate are subjected to explosion or rolling composite to prepare a single-sided stainless steel slab.

Technical Field

The invention relates to a manufacturing process of stainless steel, in particular to a production process of a single-sided stainless steel composite plate of a hot continuous rolling unit.

Background

At present, two methods are mainly used for industrially producing the stainless steel composite plate, namely an explosion cladding method and a direct rolling method.

The explosion method is characterized in that the composite metal and the base metal are impacted mutually by using the impact of detonation waves generated by explosive explosion, so that the welding of the two metals is realized; the method can only be used for producing thicker stainless steel composite plates generally, and can only be used for producing thicker stainless steel composite plates due to thicker compound layers, and meanwhile, the method is not easy to popularize and use due to serious pollution in the explosion process.

The direct rolling method is to stick the stainless steel with clean surface and the substrate together, weld and seal the edge, and realize the compounding of the stainless steel and the substrate under certain temperature and rolling pressure.

The process for producing the stainless steel composite plate by adopting the hot rolling method on the basis of the direct rolling method is adopted, but the stainless steel composite plate produced by adopting the hot rolling method in the prior art still has the defects, mainly because the base layer and the composite layer of the plate are composed of two stainless steels and substrates with different deformation resistances and thermal expansion coefficients, serious 'head warping' or 'head buckling' phenomena are generated due to uneven deformation of the two materials during normal hot rolling, the normal rolling of a rolling mill is influenced, and the faults are caused.

For the production of single-sided stainless steel composite plates, for example, application No. 200710048375.5 discloses a production method of a stainless steel composite plate, which is used for the production of single-sided stainless steel/carbon steel or low alloy steel composite plates, and the main technical scheme is that a single-sided stainless steel composite plate blank is produced by an explosion method, the surface roughness of a single-sided stainless steel composite layer of the plate blank is polished to Ra (Ra) less than or equal to 25, a layer of isolating agent is uniformly sprayed on the polished stainless steel composite layer, two plate blanks are overlapped and welded after being dried in the shade, then heating and hot rolling are carried out, and finally the hot rolled plate blank is cut to the edge and separated into two stainless steel composite plates; the single-sided stainless steel composite board produced by the manufacturing method needs polishing the surface of the stainless steel composite layer, spraying the separant, overlapping and welding two board blanks, and trimming and separating after rolling, so the method has the advantages of complex production process flow, high production cost and low production efficiency.

At the present stage, with the increase of the construction strength of the industries such as civil use, building, petroleum, chemical industry, storage and transportation, water conservancy and hydropower, the production method in the prior art cannot meet the requirements of the industries on the single-sided stainless steel composite plate, and cannot fully embody the unique low-cost advantage of the single-sided stainless steel composite plate.

In view of the above, it is desirable to develop a novel method for manufacturing single-sided stainless steel, which can make full use of the existing rolling equipment, so that the produced stainless steel composite plate has obvious advantages in plate shape and surface quality control, and can realize continuous and mass production of the single-sided stainless steel composite plate.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a production process of a single-sided stainless steel composite plate of a hot continuous rolling mill set, which is characterized in that the existing rolling equipment is fully utilized through the control of the hot rolling process, the direct hot rolling of the single-sided stainless steel composite plate is realized on the conventional hot continuous rolling mill set, the thickness of the multiple layers of the produced single-sided stainless steel composite plate is uniform, the rolling process is stable, the base layer and the multiple layers are completely combined, the layering phenomenon is avoided, the problem of warping and buckling head scrap steel in the rolling, layer cooling and coiling processes is avoided, the contradiction between the structure properties is solved, and the continuous and mass production of the single-sided stainless steel composite plate is realized.

In order to achieve the purpose, the invention adopts the following technical scheme:

a production process of a single-sided stainless steel composite plate of a hot continuous rolling unit comprises the following steps:

s1, preparing a single-sided stainless steel plate blank, assembling the common carbon steel substrate and the stainless steel clad plate, and preparing the single-sided stainless steel plate blank by adopting a compounding method;

s2, heating by a heating furnace, and feeding the single-sided stainless steel plate blank prepared in the step S1 into the heating furnace for heating after steel loading;

s3, rough rolling, namely, after descaling through a descaling box, feeding the single-sided stainless steel plate blanks heated and discharged from the furnace in the step S2 into a rough rolling mill group for rolling;

s4, finish rolling, namely, descaling the single-sided stainless steel plate blank rolled in the step S3 by a descaling box, and then feeding the single-sided stainless steel plate blank into a finishing mill group for rolling;

s5, cooling;

and S6, coiling.

Preferably, in step S2, when the single-sided stainless steel slab is installed with steel, the stainless steel surface is on the lower surface, and the carbon steel surface is on the upper surface;

when the heating furnace is used for heating, the temperature of the lower surface of the single-sided stainless steel slab is higher than that of the upper surface, and the temperature difference is 0-50 ℃;

the in-furnace time of the single-sided stainless steel plate blank is more than or equal to 150min, and the discharging temperature is 1100-1270 ℃.

Preferably, the tapping temperature of the single-sided stainless steel slab is 1180-1240 ℃.

Preferably, in step S3, during rough rolling, the lateral pressure of the large lateral press in the rough rolling mill set is less than or equal to 80mm, and the lateral pressure of the vertical roll is less than or equal to 35 mm;

the rolling speed of the upper roller of the working roller of the roughing mill set is lower than that of the lower roller.

Preferably, the single-sided stainless steel plate blank is subjected to multiple-pass rough rolling, and the rough rolling pass is more than or equal to 4.

Preferably, the large side press in the roughing mill group is empty, namely the side pressure of the large side press is 0, and the side pressure of the vertical roll is 10-35 mm.

Preferably, in the step S4, the diameter of the upper roll of the work roll of the finishing mill group is less than or equal to the diameter of the lower roll;

the finish rolling temperature of the finish rolling is 910 +/-60 ℃.

Preferably, when finish rolling is performed, all water sources except the cooling water of the rolls of the finishing mill group and the water spray on the rear side of the last stand of the finishing mill group are closed.

Preferably, when finish rolling, the finishing mill group is opened with only surface water.

Preferably, the finish rolling temperature of the finish rolling is 910. + -. 30 ℃.

Preferably, in step S1, the common carbon steel substrate and the stainless steel clad plate are prepared into a single-sided stainless steel slab by an explosion method or a rolling and cladding method.

The invention has the beneficial effects that:

1. according to the production process of the single-sided stainless steel composite plate of the hot continuous rolling mill set, direct hot rolling of the single-sided stainless steel composite plate is realized on a conventional hot continuous rolling mill set through hot rolling process control without surface polishing, spraying of a separant, welding and edge shearing machine separation procedures, the production process flow is short, the expenses of labor, materials, fields and the like can be saved, the production cost of the composite plate is greatly reduced, the production efficiency is obviously improved, the production process is pollution-free, and the production process is a green and environment-friendly process for producing the composite plate;

2. according to the production process of the single-sided stainless steel composite plate of the hot continuous rolling unit, the warping and buckling head scrap steel and the like are avoided through the control of the hot rolling process, stable batch production can be realized, and the steel coil has better steel coil quality and organization performance;

3. according to the production process of the single-sided stainless steel composite plate of the hot continuous rolling unit, the base layer and the multiple layers of the produced single-sided stainless steel composite plate are completely combined, the layering phenomenon is avoided, and the product performance and the quality meet the requirements;

4. compared with a plate-state composite plate product, the single-sided stainless steel composite plate steel coil produced by the production process of the hot continuous rolling unit can be further subjected to units for continuously removing iron scales (such as acid washing, shot blasting and the like), continuous cold rolling, continuous pipe making and the like, so that the operation efficiency is greatly improved, and the application field of the composite plate is widened.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

fig. 1 is a process flow chart of the production process of the single-sided stainless steel composite plate of the hot continuous rolling unit.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way.

As shown in fig. 1, a production process of a single-sided stainless steel composite plate of a hot continuous rolling mill group comprises the following steps:

s1, preparing a single-sided stainless steel slab, assembling the common carbon steel substrate and the stainless steel clad plate, and preparing the single-sided stainless steel slab by adopting an explosion method or a rolling composite method;

s2, heating by a heating furnace, and feeding the single-sided stainless steel plate blank prepared in the step S1 into the heating furnace for heating after steel loading; when the single-sided stainless steel slab is used for loading steel, the stainless steel surface is arranged on the lower surface, and the carbon steel surface is arranged on the upper surface; when the heating furnace is used for heating, the temperature of the lower surface of the single-sided stainless steel slab is higher than that of the upper surface, the temperature difference is 0-50 ℃, and the temperature difference is 30 ℃ as a preferred scheme; the furnace time of the single-sided stainless steel plate blank is more than or equal to 150min, and the discharging temperature is 1100-1270 ℃; as a preferred scheme, the discharging temperature of the single-sided stainless steel plate blank is 1180-1240 ℃;

s3, rough rolling, wherein the single-sided stainless steel plate blank heated and discharged from the furnace in the step S2 is descaled by a descaling box, and then is sent to a rough rolling mill set for rolling, and the single-sided stainless steel plate blank is subjected to rough rolling in multiple passes, wherein the rough rolling pass is more than or equal to 4 passes; during rough rolling, the side pressure of a large side press in a rough rolling unit is less than or equal to 80mm, and as a preferred scheme, the large side press passes through the rough rolling unit in a null mode, namely the side pressure of the large side press is 0; during rough rolling, the side pressure of each pass of a vertical roll in a rough rolling unit is less than or equal to 35mm, and as a preferred scheme, the side pressure of the vertical roll is 10-35 mm; the rolling speed of the upper roller of the working roller of the roughing mill set is lower than that of the lower roller.

S4, finish rolling, namely, descaling the single-sided stainless steel plate blank rolled in the step S3 by a descaling box, and then feeding the single-sided stainless steel plate blank into a finishing mill group for rolling; the diameter of an upper roller of a working roller of the finishing mill group is less than or equal to that of a lower roller; putting the descaling boxes into 1 group; the finish rolling temperature of the finish rolling is 910 +/-60 ℃, and as an optimal scheme, the finish rolling temperature of the finish rolling is 910 +/-30 ℃;

during finish rolling, except for the water spray of the cooling water of the roller of the finishing mill group and the water spray positioned at the rear side of the last frame of the finishing mill group, all the other water sources are closed; the rest water sources comprise front top water spraying, inlet side water spraying, loop bottom water spraying, rolling lubrication system water, anti-stripping falling water and outlet side water spraying of the 5 th and 6 th racks which are all closed in the finish rolling process;

or only opening surface water in the finishing mill group during finishing rolling; the surface water comprises water sprayed from the top of an inlet and an outlet of each rack, water sprayed from the inlet and the outlet, water of a rolling lubricating system, peeling-proof water falling, dust pressing water and the like acting on the upper surface of the stainless steel plate blank.

And S5, cooling.

S6, coiling, wherein the coiling temperature is controlled to be 20-750 ℃ according to the design requirement of the product.

The process for producing a hot continuous rolling mill train single-sided stainless steel clad plate according to the present invention is described in more detail below by selecting the grades of Q235 carbon steel and 304 stainless steel as the base plate and clad plate raw materials (see Table 1 for chemical composition).

TABLE 1

Example 1

The production process of the single-sided stainless steel composite plate of the hot continuous rolling unit in the embodiment comprises the following steps:

s1, preparing a single-sided stainless steel plate blank, selecting Q235 carbon steel and 304 stainless steel as base plate and clad plate raw materials (chemical components are shown in Table 1), assembling, and cogging by a single-stand hot rolling mill by adopting a rolling compounding method into the single-sided stainless steel plate blank which is 3600-12000 mm (length) multiplied by 1030-1900 (width) multiplied by 150-280 mm (thickness) and suitable for being rolled by a hot continuous rolling mill.

S2, heating by a heating furnace, and feeding the single-sided stainless steel plate blank prepared in the step S1 into the heating furnace for heating after steel loading; when the single-sided stainless steel slab is used for loading steel, the stainless steel surface is arranged on the lower surface, and the carbon steel surface is arranged on the upper surface; when the heating furnace is used for heating, the lower surface temperature of the single-sided stainless steel slab is higher than the upper surface temperature, and the temperature difference between the upper surface and the lower surface is 30 ℃; at the moment, the in-furnace time of the single-sided stainless steel plate blank is 240min, and the discharging temperature is 1230 ℃.

S3, rough rolling, wherein the single-sided stainless steel plate blank heated and discharged from the furnace in the step S2 is descaled by a descaling box, and then is sent to a rough rolling mill set for rolling, and the single-sided stainless steel plate blank is subjected to rough rolling in multiple passes, wherein the rough rolling pass is more than or equal to 4 passes; during rough rolling, a large side press in a rough rolling unit is empty, namely the side pressure of the large side press is 0, and the side pressure of each pass of a vertical roll is 20 mm; in order to control the rough rolling buckle head, when the rough rolling mill is bitten by each pass, the ratio of the rolling speed of the upper roll to the rolling speed of the lower roll of the working roll is 1: 1.07.

s4, finish rolling, namely, descaling the single-sided stainless steel plate blank rolled in the step S3 by a descaling box, and then feeding the single-sided stainless steel plate blank into a finishing mill group for rolling; the finish rolling temperature of finish rolling is 910 +/-30 ℃; in order to control the finish rolling buckle, the diameter of an upper roller of a working roller of a finish rolling unit is less than or equal to that of a lower roller;

during finish rolling, except for the water spray of the cooling water of the roller of the finishing mill group and the water spray positioned at the rear side of the last frame of the finishing mill group, all the other water sources are closed; and other water sources comprise front top water spraying, inlet side water spraying, loop bottom water spraying, rolling lubricating system water, stripping-proof water falling and outlet side water spraying of the 5 th and 6 th racks which are all closed.

And S5, cooling.

S6, coiling, wherein the coiling temperature is controlled to be 20-750 ℃ according to the design requirement of the product.

The steps of the method can realize stable, continuous and mass production, the prepared single-sided stainless steel composite plate has the thickness of 6mm, the width of 1500mm, the interface shear strength of 194Mpa (standard is more than or equal to 100Mpa), the upper yield strength of 295Mpa (standard is more than or equal to 235Mpa), the post-fracture elongation of 33.0% (standard is more than or equal to 26.0%), the internal and external bending is qualified (d is 2a), the single-sided stainless steel composite plate has good shape, the surface has no buckling phenomenon, and the surface quality is qualified.

Example 2

The production process of the single-sided stainless steel composite plate of the hot continuous rolling unit in the embodiment comprises the following steps:

s1, preparing a single-sided stainless steel plate blank, selecting Q235 carbon steel and 304 stainless steel as base plate and composite plate raw materials (chemical components are shown in Table 1), assembling the blank, and preparing the single-sided stainless steel plate blank which is 3600-12000 mm (length) multiplied by 1030-1900 (width) multiplied by 150-280 mm (thickness) and is suitable for being rolled by a hot continuous rolling mill by adopting an explosion method.

S2, heating by a heating furnace, and feeding the single-sided stainless steel plate blank prepared in the step S1 into the heating furnace for heating after steel loading; when the single-sided stainless steel slab is used for loading steel, the stainless steel surface is arranged on the lower surface, and the carbon steel surface is arranged on the upper surface; when the heating furnace is used for heating, the lower surface temperature of the single-sided stainless steel slab is higher than the upper surface temperature, and the temperature difference between the upper surface and the lower surface is 30 ℃; at the moment, the in-furnace time of the single-sided stainless steel plate blank is 240min, and the discharging temperature is 1230 ℃.

S3, rough rolling, wherein the single-sided stainless steel plate blank heated and discharged from the furnace in the step S2 is descaled by a descaling box, and then is sent to a rough rolling mill set for rolling, and the single-sided stainless steel plate blank is subjected to rough rolling in multiple passes, wherein the rough rolling pass is more than or equal to 4 passes; during rough rolling, a large side press in a rough rolling unit is empty, namely the side pressure of the large side press is 0, and the side pressure of each pass of a vertical roll is 20 mm; in order to control the rough rolling buckle head, when the rough rolling mill is bitten by each pass, the ratio of the rolling speed of the upper roll to the rolling speed of the lower roll of the working roll is 1: 1.07.

s4, finish rolling, namely, descaling the single-sided stainless steel plate blank rolled in the step S3 by a descaling box, and then feeding the single-sided stainless steel plate blank into a finishing mill group for rolling; the finish rolling temperature of finish rolling is 910 +/-30 ℃; in order to control the finish rolling buckle, the diameter of an upper roller of a working roller of a finish rolling unit is less than or equal to that of a lower roller;

during finish rolling, only surface water is opened in a finishing mill group; the surface water comprises water sprayed from the top of an inlet and an outlet of each rack, water sprayed from the inlet and the outlet, water of a rolling lubricating system, peeling-proof water falling, dust pressing water and the like acting on the upper surface of the stainless steel plate blank.

And S5, cooling.

S6, coiling, wherein the coiling temperature is controlled to be 20-750 ℃ according to the design requirement of the product.

The steps of the method can realize stable, continuous and mass production, the prepared single-sided stainless steel composite plate has the thickness of 4mm, the width of 1500mm, the interface shear strength of 202Mpa (standard is more than or equal to 100Mpa), the upper yield strength of 301Mpa (standard is more than or equal to 235Mpa), the post-fracture elongation of 34.0% (standard is more than or equal to 26.0%), the internal and external bending is qualified (d is 2a), the single-sided stainless steel composite plate has good shape, the surface has no buckling phenomenon, and the surface quality is qualified.

Example 3

The production process of the single-sided stainless steel composite plate of the hot continuous rolling unit in the embodiment comprises the following steps:

s1, preparing a single-sided stainless steel plate blank, selecting Q235 carbon steel and 304 stainless steel as base plate and clad plate raw materials (chemical components are shown in Table 1), assembling, and cogging by a single-stand hot rolling mill by adopting a rolling compounding method into the single-sided stainless steel plate blank which is 3600-12000 mm (length) multiplied by 1030-1900 (width) multiplied by 150-280 mm (thickness) and suitable for being rolled by a hot continuous rolling mill.

S2, heating by a heating furnace, and feeding the single-sided stainless steel plate blank prepared in the step S1 into the heating furnace for heating after steel loading; when the single-sided stainless steel slab is used for loading steel, the stainless steel surface is arranged on the lower surface, and the carbon steel surface is arranged on the upper surface; when the heating furnace is used for heating, the lower surface temperature of the single-sided stainless steel slab is higher than the upper surface temperature, and the temperature difference between the upper surface and the lower surface is 30 ℃; at the moment, the in-furnace time of the single-sided stainless steel slab is 230min, and the discharging temperature is 1180 ℃.

S3, rough rolling, wherein the single-sided stainless steel plate blank heated and discharged from the furnace in the step S2 is descaled by a descaling box, and then is sent to a rough rolling mill set for rolling, and the single-sided stainless steel plate blank is subjected to rough rolling in multiple passes, wherein the rough rolling pass is more than or equal to 4 passes; during rough rolling, the large side press in the rough rolling unit is empty, namely the side pressure of the large side press is 0, and the side pressure of each pass of the vertical roll is 0; in order to control the rough rolling buckle head, when the rough rolling mill is bitten by each pass, the ratio of the rolling speed of the upper roll to the rolling speed of the lower roll of the working roll is 1: 1.07.

s4, finish rolling, namely, descaling the single-sided stainless steel plate blank rolled in the step S3 by a descaling box, and then feeding the single-sided stainless steel plate blank into a finishing mill group for rolling; the finish rolling temperature of finish rolling is 910 +/-30 ℃; in order to control the finish rolling buckle, the diameter of an upper roller of a working roller of a finish rolling unit is less than or equal to that of a lower roller;

during finish rolling, except for the water spray of the cooling water of the roller of the finishing mill group and the water spray positioned at the rear side of the last frame of the finishing mill group, all the other water sources are closed; and other water sources comprise front top water spraying, inlet side water spraying, loop bottom water spraying, rolling lubricating system water, stripping-proof water falling and outlet side water spraying of the 5 th and 6 th racks which are all closed.

And S5, cooling.

S6, coiling, wherein the coiling temperature is controlled to be 20-750 ℃ according to the design requirement of the product.

The steps of the method can realize stable, continuous and mass production, the prepared single-sided stainless steel composite plate has the thickness of 12mm, the width of 1500mm, the interface shear strength of 165Mpa (standard is more than or equal to 100Mpa), the upper yield strength of 296Mpa (standard is more than or equal to 235Mpa), the post-fracture elongation of 31.0% (standard is more than or equal to 26.0%), the internal and external bending is qualified (d is 2a), the single-sided stainless steel composite plate has good shape, the surface has no warping and buckling phenomenon, and the surface quality is qualified.

Example 4

The production process of the single-sided stainless steel composite plate of the hot continuous rolling unit in the embodiment comprises the following steps:

s1, preparing a single-sided stainless steel plate blank, selecting Q235 carbon steel and 304 stainless steel as base plate and clad plate raw materials (chemical components are shown in Table 1), assembling, and cogging by a single-stand hot rolling mill by adopting a rolling compounding method into the single-sided stainless steel plate blank which is 3600-12000 mm (length) multiplied by 1030-1900 (width) multiplied by 150-280 mm (thickness) and suitable for being rolled by a hot continuous rolling mill.

S2, heating by a heating furnace, and feeding the single-sided stainless steel plate blank prepared in the step S1 into the heating furnace for heating after steel loading; when the single-sided stainless steel slab is used for loading steel, the stainless steel surface is arranged on the lower surface, and the carbon steel surface is arranged on the upper surface; when the heating furnace is used for heating, the lower surface temperature of the single-sided stainless steel slab is higher than the upper surface temperature, and the temperature difference between the upper surface and the lower surface is 30 ℃; at the moment, the in-furnace time of the single-sided stainless steel plate blank is 200min, and the discharging temperature is 1200 ℃.

S3, rough rolling, wherein the single-sided stainless steel plate blank heated and discharged from the furnace in the step S2 is descaled by a descaling box, and then is sent to a rough rolling mill set for rolling, and the single-sided stainless steel plate blank is subjected to rough rolling in multiple passes, wherein the rough rolling pass is more than or equal to 4 passes; during rough rolling, a large side press in a rough rolling unit is empty, namely the side pressure of the large side press is 0, and the side pressure of each pass of a vertical roll is 30 mm; in order to control the rough rolling buckle head, when the rough rolling mill is bitten by each pass, the ratio of the rolling speed of the upper roll to the rolling speed of the lower roll of the working roll is 1: 1.07. .

S4, finish rolling, namely, descaling the single-sided stainless steel plate blank rolled in the step S3 by a descaling box, and then feeding the single-sided stainless steel plate blank into a finishing mill group for rolling; the finish rolling temperature of finish rolling is 910 +/-30 ℃; in order to control the finish rolling buckle, the diameter of an upper roller of a working roller of a finish rolling unit is less than or equal to that of a lower roller;

during finish rolling, except for the water spray of the cooling water of the roller of the finishing mill group and the water spray positioned at the rear side of the last frame of the finishing mill group, all the other water sources are closed; and other water sources comprise front top water spraying, inlet side water spraying, loop bottom water spraying, rolling lubricating system water, stripping-proof water falling and outlet side water spraying of the 5 th and 6 th racks which are all closed.

And S5, cooling.

S6, coiling, wherein the coiling temperature is controlled to be 20-750 ℃ according to the design requirement of the product.

The steps of the method can realize stable, continuous and mass production, the thickness of the prepared single-sided stainless steel composite plate is 8mm, the width is 1550mm, the interface shear strength is 177Mpa (standard is more than or equal to 100Mpa), the upper yield strength is 276Mpa (standard is more than or equal to 235Mpa), the post-fracture elongation is 34.0% (standard is more than or equal to 26.0%), the internal and external bending is qualified (d is 2a), the single-sided stainless steel composite plate has good shape, the surface has no warping and buckling phenomenon, and the surface quality is qualified.

Example 5

The production process of the single-sided stainless steel composite plate of the hot continuous rolling unit in the embodiment comprises the following steps:

s1, preparing a single-sided stainless steel plate blank, selecting Q235 carbon steel and 304 stainless steel as base plate and clad plate raw materials (chemical components are shown in Table 1), assembling, and cogging by a single-stand hot rolling mill by adopting a rolling compounding method into the single-sided stainless steel plate blank which is 3600-12000 mm (length) multiplied by 1030-1900 (width) multiplied by 150-280 mm (thickness) and suitable for being rolled by a hot continuous rolling mill.

S2, heating by a heating furnace, and feeding the single-sided stainless steel plate blank prepared in the step S1 into the heating furnace for heating after steel loading; when the single-sided stainless steel slab is used for loading steel, the stainless steel surface is arranged on the lower surface, and the carbon steel surface is arranged on the upper surface; when the heating furnace is used for heating, the lower surface temperature of the single-sided stainless steel slab is higher than the upper surface temperature, and the temperature difference between the upper surface and the lower surface is 40 ℃; the in-furnace time of the single-sided stainless steel plate blank is 220min, and the discharging temperature is 1200 ℃.

S3, rough rolling, wherein the single-sided stainless steel plate blank heated and discharged from the furnace in the step S2 is descaled by a descaling box, and then is sent to a rough rolling mill set for rolling, and the single-sided stainless steel plate blank is subjected to rough rolling in multiple passes, wherein the rough rolling pass is more than or equal to 4 passes; during rough rolling, a large side press in a rough rolling unit is empty, namely the side pressure of the large side press is 0, and the side pressure of each pass of a vertical roll is 10 mm; in order to control the rough rolling buckle head, when the rough rolling mill is bitten by each pass, the ratio of the rolling speed of the upper roll to the rolling speed of the lower roll of the working roll is 1: 1.06.

s4, finish rolling, namely, descaling the single-sided stainless steel plate blank rolled in the step S3 by a descaling box, and then feeding the single-sided stainless steel plate blank into a finishing mill group for rolling; the finish rolling temperature of finish rolling is 910 +/-30 ℃; in order to control the finish rolling buckle, the diameter of an upper roller of a working roller of a finish rolling unit is less than or equal to that of a lower roller;

during finish rolling, except for the water spray of the cooling water of the roller of the finishing mill group and the water spray positioned at the rear side of the last frame of the finishing mill group, all the other water sources are closed; and other water sources comprise front top water spraying, inlet side water spraying, loop bottom water spraying, rolling lubricating system water, stripping-proof water falling and outlet side water spraying of the 5 th and 6 th racks which are all closed.

And S5, cooling.

S6, coiling, wherein the coiling temperature is controlled to be 20-750 ℃ according to the design requirement of the product.

The steps of the method can realize stable, continuous and mass production, the prepared single-sided stainless steel composite plate has the thickness of 10mm, the width of 1600mm, the interface shear strength of 135Mpa (standard is more than or equal to 100Mpa), the upper yield strength of 287Mpa (standard is more than or equal to 235Mpa), the post-fracture elongation of 33.0% (standard is more than or equal to 26.0%), the internal and external bending is qualified (d is 2a), the single-sided stainless steel composite plate has good shape, the surface has no buckle head warping phenomenon, and the surface quality is qualified.

Example 6

The production process of the single-sided stainless steel composite plate of the hot continuous rolling unit in the embodiment comprises the following steps:

s1, preparing a single-sided stainless steel plate blank, selecting Q235 carbon steel and 304 stainless steel as base plate and clad plate raw materials (chemical components are shown in Table 1), assembling, and cogging by a single-stand hot rolling mill by adopting a rolling compounding method into the single-sided stainless steel plate blank which is 3600-12000 mm (length) multiplied by 1030-1900 (width) multiplied by 150-280 mm (thickness) and suitable for being rolled by a hot continuous rolling mill.

S2, heating by a heating furnace, and feeding the single-sided stainless steel plate blank prepared in the step S1 into the heating furnace for heating after steel loading; when the single-sided stainless steel slab is used for loading steel, the stainless steel surface is arranged on the lower surface, and the carbon steel surface is arranged on the upper surface; when the heating furnace is used for heating, the lower surface temperature of the single-sided stainless steel slab is higher than the upper surface temperature, and the temperature difference between the upper surface and the lower surface is 10 ℃; at the moment, the in-furnace time of the single-sided stainless steel plate blank is 250min, and the discharging temperature is 1250 ℃.

S3, rough rolling, wherein the single-sided stainless steel plate blank heated and discharged from the furnace in the step S2 is descaled by a descaling box, and then is sent to a rough rolling mill set for rolling, and the single-sided stainless steel plate blank is subjected to rough rolling in multiple passes, wherein the rough rolling pass is more than or equal to 4 passes; during rough rolling, a large side press in a rough rolling unit is empty, namely the side pressure of the large side press is 0, and the side pressure of each pass of a vertical roll is 35 mm; in order to control the rough rolling buckle head, when the rough rolling mill is bitten by each pass, the ratio of the rolling speed of the upper roll to the rolling speed of the lower roll of the working roll is 1: 1.06.

s4, finish rolling, namely, descaling the single-sided stainless steel plate blank rolled in the step S3 by a descaling box, and then feeding the single-sided stainless steel plate blank into a finishing mill group for rolling; the finish rolling temperature of finish rolling is 910 +/-30 ℃; in order to control the finish rolling buckle, the diameter of an upper roller of a working roller of a finish rolling unit is less than or equal to that of a lower roller;

during finish rolling, except for the water spray of the cooling water of the roller of the finishing mill group and the water spray positioned at the rear side of the last frame of the finishing mill group, all the other water sources are closed; and other water sources comprise front top water spraying, inlet side water spraying, loop bottom water spraying, rolling lubricating system water, stripping-proof water falling and outlet side water spraying of the 5 th and 6 th racks which are all closed.

And S5, cooling.

S6, coiling, wherein the coiling temperature is controlled to be 20-750 ℃ according to the design requirement of the product.

The steps of the method can realize stable, continuous and mass production, the prepared single-sided stainless steel composite plate has the thickness of 10mm, the width of 1200mm, the interface shear strength of 175MPa (standard is more than or equal to 100MPa), the upper yield strength of 269MPa (standard is more than or equal to 235MPa), the post-fracture elongation of 35.0 percent (standard is more than or equal to 26.0 percent), the internal and external bending is qualified (d is 2a), the single-sided stainless steel composite plate has good shape, the surface has no buckling phenomenon, and the surface quality is qualified.

Comparative example 1

The production process of the single-sided stainless steel composite plate of the hot continuous rolling unit in the embodiment comprises the following steps:

s1, preparing a single-sided stainless steel plate blank, selecting Q235 carbon steel and 304 stainless steel as base plate and composite plate raw materials (chemical components are shown in Table 1), assembling the blank, and cogging the blank by a single-stand hot rolling mill by adopting a rolling compounding method into the single-sided stainless steel plate blank which is 3600-12000 mm (length) multiplied by 1030-1900 (width) multiplied by 150-280 mm (thickness) and is suitable for being rolled by a hot continuous rolling mill;

s2, heating by a heating furnace, and feeding the single-sided stainless steel plate blank prepared in the step S1 into the heating furnace for heating after steel loading; when the single-sided stainless steel slab is used for loading steel, the stainless steel surface is arranged on the lower surface, and the carbon steel surface is arranged on the upper surface; when the heating furnace is used for heating, the lower surface temperature of the single-sided stainless steel slab is higher than the upper surface temperature, and the temperature difference between the upper surface and the lower surface is 30 ℃; at the moment, the in-furnace time of the single-sided stainless steel plate blank is 210min, and the discharging temperature is 1080 ℃.

S3, rough rolling, wherein the single-sided stainless steel plate blank heated and discharged from the furnace in the step S2 is descaled by a descaling box, and then is sent to a rough rolling mill set for rolling, and the single-sided stainless steel plate blank is subjected to rough rolling in multiple passes, wherein the rough rolling pass is more than or equal to 4 passes; during rough rolling, a large side press in a rough rolling unit is empty, namely the side pressure of the large side press is 0, and the side pressure of each pass of a vertical roll is 20 mm; in order to control the rough rolling buckle head, when the rough rolling mill is bitten by each pass, the ratio of the rolling speed of the upper roll to the rolling speed of the lower roll of the working roll is 1: 1.09.

s4, finish rolling, namely, descaling the single-sided stainless steel plate blank rolled in the step S3 by a descaling box, and then feeding the single-sided stainless steel plate blank into a finishing mill group for rolling; the finish rolling temperature of finish rolling is 910 +/-30 ℃; in order to control the finish rolling buckle, the diameter of an upper roller of a working roller of a finish rolling unit is less than or equal to that of a lower roller;

during finish rolling, except for the water spray of the cooling water of the roller of the finishing mill group and the water spray positioned at the rear side of the last frame of the finishing mill group, all the other water sources are closed; and other water sources comprise front top water spraying, inlet side water spraying, loop bottom water spraying, rolling lubricating system water, stripping-proof water falling and outlet side water spraying of the 5 th and 6 th racks which are all closed.

S5, cooling;

s6, coiling: the coiling temperature is controlled to be 20-750 ℃ according to the design requirement of the product.

The steps of the method can realize stable, continuous and mass production, the thickness of the prepared single-sided stainless steel composite plate is 15mm, the width is 1550mm, the interface shear strength is 198Mpa (standard is more than or equal to 100Mpa), the upper yield strength is 301Mpa (standard is more than or equal to 235Mpa), the post-fracture elongation is 32.0% (standard is more than or equal to 26.0%), the internal and external bending is qualified (d is 2a), and the tapping temperature is 1080 ℃, which is lower than the tapping temperature lower limit of the method, so that the surface of the single-sided stainless steel composite plate generates iron sheet defects.

Comparative example 2

The other steps are the same as the process parameters of the example 3, in the step S3, only the side pressure amount of each pass of the vertical roll is changed, specifically, the side pressure amount of each pass of the vertical roll is 100mm, and the prepared single-sided stainless steel composite plate has the defects that the bonding layer is rolled open due to the overlarge side pressure amount of the vertical roll, and scrap steel is caused.

Comparative example 3

The other steps are the same as the process parameters of the embodiment 3, and in the step S2, only the upper and lower surfaces of the single-sided stainless steel slab during steel loading are changed, namely, when the single-sided stainless steel slab is loaded with steel, the stainless steel surface is on the upper surface, and the carbon steel surface is on the lower surface; the prepared single-sided stainless steel composite plate seriously warps, and impacts a guard plate above a rack or a rough and finish rolling heat-insulating cover, so that scrap steel is caused.

Comparative example 4

The other steps are the same as the process parameters of the embodiment 3, and in the step S2, only the temperature difference between the upper surface and the lower surface of the single-sided stainless steel slab is changed when the heating furnace is used for heating, that is, the temperature of the upper surface of the single-sided stainless steel slab is higher than the temperature of the lower surface by 30 ℃ when the heating furnace is used for heating, and at this time, the rough rolling and the head buckling are serious, so that the continuous production cannot be realized.

Comparative example 5

The other steps are the same as the process parameters of the embodiment 3, and in step S2, only the rolling speed of the upper roller and the rolling speed of the lower roller of the working roller of the roughing mill are changed, that is, when the rolling speed of the upper roller is equal to the rolling speed of the lower roller, the roughing buckle is serious.

Comparative example 6

The other steps are the same as the process parameters of the embodiment 3, and in step S2, only the rolling speed of the upper roller and the rolling speed of the lower roller of the working roller of the roughing mill are changed, that is, when the rolling speed of the upper roller is higher than the rolling speed of the lower roller, the roughing head is serious, and there is a risk of damaging the equipment.

It can be seen from the above examples 1 to 6 and comparative examples 1 to 6 that stable, continuous and mass production can be achieved by controlling the hot rolling process, and the prepared single-sided stainless steel composite plate has uniform thickness, excellent mechanical properties, good plate shape, no warping and buckling phenomenon on the surface and qualified quality.

In conclusion, through the control of the hot rolling process, the direct hot rolling of the single-sided stainless steel composite plate is realized on the conventional hot continuous rolling mill set without surface polishing, spraying of an isolating agent, welding, edge shearing and separation procedures, the production process flow is short, the expenses of labor, materials, fields and the like can be saved, the production cost of the composite plate is greatly reduced, the production efficiency is obviously improved, the production process is pollution-free, and the process is a green and environment-friendly process for producing the composite plate; meanwhile, the rolling process is stable, the problem of warping buckle head scrap steel in the rolling, layer cooling and coiling processes is avoided, the contradiction between the structure performance is solved, and continuous and large-batch production can be realized; and the prepared single-sided stainless steel composite board has no layering phenomenon after the base layer and the multiple layers are completely combined.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.