阅读说明：本技术 一种钛及钛合金型材与型钢共线生产方法 (Collinear production method of titanium and titanium alloy section and section steel ) 是由 邢军 吴保桥 张建 夏勐 黄琦 吴湄庄 汪杰 彦井成 丁朝晖 何军委 陈辉 彭 于 2019-12-12 设计创作，主要内容包括：本发明公开了一种钛及钛合金型材与型钢共线生产方法,所述共线生产方法中,生产钛及钛合金型材的方法是先将钛或钛合金坯料依次经涂刷防护涂层、第一加热炉加热后,依次通过型钢生产线中的第一两辊可逆开坯机轧制、第二两辊可逆开坯机轧制、热锯切头、精轧机组轧制、倍尺飞剪分段及冷床冷却,再经第二加热炉加热后,依次通过型钢生产线中的矫直机矫直、成排及冷锯机切定尺后得到型材。在中小型型钢生产线上实现钛及钛合金型材生产,解决了钢-钛共线生产技术难题,为经济型生产钛及钛合金型材提供方法。(The invention discloses a collinear production method of titanium and titanium alloy profiles and section steel, wherein in the collinear production method, a method for producing the titanium and titanium alloy profiles comprises the steps of sequentially coating a protective coating on a titanium or titanium alloy blank, heating by a first heating furnace, rolling by a first two-roller reversible cogging mill, rolling by a second two-roller reversible cogging mill, hot saw cutting, rolling by a finishing mill set, segmenting by a double-length flying shear and cooling by a cooling bed in a section steel production line, heating by a second heating furnace, and sequentially straightening by a straightener, arranging and cutting to length by a cold saw in the section steel production line to obtain the profiles. The production of titanium and titanium alloy profiles is realized on a small and medium-sized profile steel production line, the technical problem of steel-titanium collinear production is solved, and a method is provided for economically producing the titanium and titanium alloy profiles.)

1. A collinear production method of titanium and titanium alloy profiles and section steel is characterized in that in the collinear production method, a titanium and titanium alloy profile is produced by sequentially brushing a protective coating on a titanium or titanium alloy blank, heating the titanium or titanium alloy blank by a first heating furnace, rolling the titanium or titanium alloy blank by a first two-roller reversible cogging mill, rolling the titanium or titanium alloy blank by a second two-roller reversible cogging mill, hot sawing and cutting a head, rolling by a finishing mill set, segmenting by a double-length flying shear and cooling by a cooling bed in a section steel production line, heating the titanium or titanium alloy blank by a second heating furnace, and sequentially straightening by a straightener in the section steel production line, arranging the titanium or titanium alloy profile and cutting the section steel to a fixed length by a cold saw to obtain.

2. The method of claim 1, wherein the method of producing the section steel comprises heating a steel blank in a step furnace, removing phosphorus, rolling with a first two-roll reversible cogging mill, rolling with a second two-roll reversible cogging mill, hot sawing to cut ends, rolling with a finishing mill, segmenting with multiple-length flying shears, cooling with a cooling bed, straightening with a straightener, arranging, and cutting to length with a cold sawing machine.

3. A method for the collinear production of profiles of titanium and titanium alloys and section steels according to claim 1, characterized in that 3-5 pieces of steel are previously rolled to preheat the rolls and the roller table before being rolled by the first two-roll reversible cogging mill.

4. The method of claim 1, wherein the dephosphorization water in the production line of the section steel is shut down, and the lubrication water and cooling water of the first two-roll reversible cogging mill, the second two-roll reversible cogging mill and the finishing mill are shut down when the titanium material is rolled.

5. A collinear production method of the titanium and titanium alloy section and the section steel according to claim 1, which is characterized in that when titanium with the mark numbers of TA1, TA2, TA3, TA4, TA5, TA6 and TA7 is adopted for rolling, the heating temperature of a first heating furnace is 900-950 ℃, and the heat preservation time is 120-180 min; the rolling temperature of the first two-roller reversible cogging mill is 870-890 ℃; the rolling temperature of the second two-roller reversible cogging mill is 820-850 ℃; the rolling temperature of the finishing mill is 730-780 ℃, the rolling pass of each pass is executed according to the steel rolling pass, and the speed of a cooling bed is more than 100 mm/s; the heating temperature of the second heating furnace is 500-600 ℃.

6. The collinear production method of the titanium and titanium alloy section and the section steel as the claim 1 is characterized in that when titanium alloys with the mark numbers of TA8, TA8-1, TA9, TA9-1, TA10, TA13, TA15, TA18, TC1, TC2, TC3, TC4 and TC10 are adopted for rolling, the heating temperature of a first heating furnace is 1100-1200 ℃, and the heat preservation time is 120-180 min; the rolling temperature of the first two-roller cogging mill is 1050-; the rolling temperature of the second two-roller cogging mill is 950-1000 ℃; the rolling temperature of the finishing mill is 850-; the heating temperature of the second heating furnace is 500-600 ℃.

7. A collinear production method of titanium and titanium alloy profiles and section steels according to claim 1, characterized in that the first heating furnace is a box-type resistance heating furnace.

8. The method of claim 1 wherein the second furnace is a tubular induction furnace.

9. A collinear production method for a titanium and titanium alloy section and a section steel according to claim 1, wherein the titanium and titanium alloy section is an H-shaped section, a groove-shaped section or an angle-shaped section.

10. A collinear production method for a titanium and titanium alloy section and a section steel according to claim 9, wherein the collinear production method is used for producing the section steel with the straightness less than or equal to 2mm/m, the longitudinal torsion angle less than or equal to 2 °/m, the allowable deviation of wall thickness +/-0.3 mm, and the surface roughness Rz of the section steel less than or equal to 80 μm.

Technical Field

The invention belongs to the technical field of metal processing, and particularly relates to a collinear production method of titanium and titanium alloy sectional materials and section steel.

Background

The titanium and titanium alloy section bar has light weight, high strength and excellent mechanical property, and is widely applied to national defense industry and civil industries such as petroleum, chemical industry, metallurgy, electric power, traffic, medical treatment, ocean, environmental protection, building, sports, tourism and leisure, etc. At present, extrusion molding is generally adopted for producing titanium and titanium alloy sections. Because the flow rate of titanium and titanium alloy metal and the filling uniformity of an extrusion cavity in the extrusion forming process are difficult to control and other factors, the extrusion forming yield is low, the dimensional accuracy is poor, the production cost is high, and the length of a product is severely limited. In addition, because the consumption of titanium and titanium alloy is relatively small, the investment cost of newly-built special titanium material rolling production line is high, and the input-output ratio is low. Therefore, in order to efficiently produce thick-wall titanium and titanium alloy sections with simple sections and relatively large demand at low cost, the hot-rolled section steel production line is used for producing titanium and titanium alloy, so that the collinear production of steel and titanium is realized, and the method is a brand new development trend for producing titanium and titanium alloy section steel. The conventional hot rolling production line for medium and small sized section steel generally consists of 2 frames of reversible cogging mills BD1, BD2 (two-high mill) and 6 frames of finishing mills F1-F6 (universal mill).

According to the production of the titanium and titanium alloy hot continuous rolling strip, because of the specificity of the titanium and titanium alloy material and the uniqueness of the control process (compared with the production of steel products), particularly the high-temperature plasticity of the titanium and titanium alloy is good, and the extension and the wide-spread deformation of the hot rolling process are large; the low-temperature deformation resistance is large, when the low-temperature deformation resistance is lower than a certain temperature value, the deformation resistance is sharply increased, the elastic modulus is large, the resilience after deformation is serious, and the like, so that the titanium section is unstable in the hot rolling process, the quality and the metal yield of the titanium section are directly influenced, and the production efficiency of a rolling unit is also influenced. Meanwhile, considering that the section is produced in a pass mode, the pass design, the reduction rate of each pass, the rolling speed, the temperature of a rolled piece, the friction coefficient, the continuous rolling tension and other process conditions, and subsequent process parameters such as the straightening of the titanium section are all key factors for restricting the production of the titanium and titanium alloy sections.

At present, some research works are carried out on bars and T-shaped steels in titanium and titanium alloy sections, but most of the work is still in the laboratory research stage. For example, the article published in the hot working process of Maofeilong, Shuimei, Qin Jianping and the like has the focus that an eight-stand Y-shaped rolling mill which is self-developed is adopted to roll TC4 titanium alloy phi 6mm and phi 12 bars; a Master thesis published by Huang-tunna focuses on studying the rolling rule of TA15 alloy thin-wall T-shaped sections by using finite element software; the articles published in the "titanium industry development" such as korean shigaku, dong wei chou, dubai and the like have the focus of numerical simulation of the multi-pass rolling forming process of a special-shaped titanium material (a round material) by using finite element software.

In addition, in the patent aspect, there are reports about the production of titanium and titanium alloy profiles (T-shaped, U-shaped, Z-shaped, L-shaped, bar, wire rod, seamless steel pipe, square tube), but there is no report about the titanium and titanium alloy H profile, and there is no report about how to solve the problems of different heating systems when the titanium and titanium alloy profiles and the steel material are rolled in succession, and the problems of the temperature control and the subsequent straightening of the titanium billet in the rolling process.

The invention patent CN 105903766B, entitled "production system and production method for large-size titanium and titanium alloy square tube", discloses a production system and production method for large-size titanium and titanium alloy square tube, comprising the following equipment: the device comprises a centering machine, an annular heating furnace, a high-precision internal centering mushroom type perforating unit, a high-precision retained mandrel multifunctional calender unit, a medium-frequency induction heating type high-precision sizing unit, a mobile device, a straightening machine and the like. The invention relates to a production system and a production method of titanium and titanium alloy square and rectangular tubes, which mainly relate to production equipment and a production process flow.

Patent document CN 105921544B entitled "hot working production system for titanium and titanium alloy seamless pipes, products produced by the system, and method for producing the products" discloses a hot working production system for titanium and titanium alloy seamless pipes, seamless pipes produced by the hot working production system, and a hot working production method for the seamless pipes. Through the improvement of each unit and various auxiliary devices, particularly the material of the parts and the reselection of the heating rolling working mode of the parts, the equipment precision and the control system stability are improved, the rolling process is more stable, and the quality and the size stability of the inner surface and the outer surface of the seamless pipe are ensured. On the basis, the hot working production method is reasonable and efficient in arrangement among the working procedures, the protective layer is coated before the tube blank is heated, the problems of reaction between the tube blank and oxygen and nitrogen and hydrogen absorption are well solved, the defect of overproof phenomenon cannot occur in the tube blank, and a foundation is made for subsequent rolling. The invention relates to a hot working production system for titanium and titanium alloy seamless tubes, which mainly relates to temperature control of the titanium and titanium alloy seamless tubes in the rolling process.

The invention patent CN 106282867B, entitled "TA 2 thin-wall titanium alloy seamless steel pipe and preparation method thereof", discloses a TA2 thin-wall titanium alloy seamless pipe and preparation method thereof. The preparation method comprises the steps of heating in a circular heating furnace → oblique rolling and perforation → vacuum annealing → straightening → acid washing → cold rolling → degreasing → vacuum annealing → straightening → acid washing. By controlling the heating temperature, using the steel-titanium bonding prevention coating and optimizing the perforation process parameters and the finished product annealing process parameters, the problem that the pure titanium pipe is difficult to perforate at low temperature and easy to generate the phenomena of titanium adhesion and the like with a guide disc in the prior art to form serious defects is solved, and the TA2 seamless pipe with high strength is developed. The invention relates to a preparation method of a titanium and titanium alloy seamless tube, which mainly solves the problem that in the prior art, a pure titanium tube is difficult to perforate at low temperature and is easy to generate the phenomena of titanium adhesion and the like with a guide disc to form serious defects.

The invention patent CN 106475415B, entitled "hot continuous rolling method of industrial pure titanium and titanium alloy", discloses a hot continuous rolling method of industrial pure titanium and titanium alloy, which is suitable for batch rolling of industrial pure titanium and titanium alloy in a hot continuous rolling steel production line. The hot continuous rolling steel production line is adopted to roll titanium and titanium alloy, and the rolling of strip steel is inserted in the rolling process of the titanium and titanium alloy according to the rolling plan, so that the stability of the hot continuous rolling titanium and titanium alloy can be improved, and the efficient production of steel-titanium collineation is realized. In addition, the working roll of the rolling mill adopts a negative roll shape, the roll shape curve has the function of automatic centering on the rolled piece, the control requirement of the section shape of the rolled piece on special material and special process conditions of the rolled piece can be met, and the improvement of the rolling stability and the improvement of the shape control are realized. The invention relates to a hot continuous rolling method for plates made of industrial pure titanium and titanium alloy, which does not consider how to overcome the problems of different heating systems of titanium materials and steel materials and the control of cooling water of a rolling mill.

Disclosure of Invention

The invention aims to solve the technical problems in the prior art. Therefore, the invention provides a collinear production method of titanium and titanium alloy profiles and section steel, and aims to realize the collinear alternating and efficient production of the titanium and titanium alloy profiles by steel and titanium on a small and medium-sized section steel production line.

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

a collinear production method for titanium and titanium alloy profiles and section steel comprises the steps of sequentially coating a protective coating on a titanium or titanium alloy blank, heating the titanium or titanium alloy blank by a first heating furnace, sequentially rolling the titanium or titanium alloy blank by a first two-roller reversible cogging mill, rolling by a second two-roller reversible cogging mill, hot sawing and cutting heads, rolling by a finishing mill group, segmenting by double-length flying shears and cooling by a cooling bed in a section steel production line, heating the titanium or titanium alloy blank by a second heating furnace, sequentially straightening by a straightener in the section steel production line, arranging in rows and cutting to length by a cold saw to obtain the section steel.

In the collinear production method, the method for producing the section steel is that a steel blank is sequentially subjected to heating by a stepping heating furnace, dephosphorization, rolling by a first two-roller reversible cogging mill, rolling by a second two-roller reversible cogging mill, hot sawing and head cutting, rolling by a finishing mill group, multi-length flying shear segmentation, cooling by a cooling bed, straightening by a straightening machine, row forming and cutting and sizing by a cold sawing machine to obtain the section steel.

Before rolling by the first two-roller reversible cogging mill, rolling 3-5 steel materials in advance to preheat the rollers and the roller way.

When the titanium material is rolled, the dephosphorization water in the section steel production line is closed, and the lubricating water and the cooling water of the first two-roller reversible cogging mill for rolling, the second two-roller reversible cogging mill for rolling and the finishing mill are closed.

When titanium with the mark numbers of TA1, TA2, TA3, TA4, TA5, TA6 and TA7 is adopted for rolling, the heating temperature of a first heating furnace is 900-950 ℃, and the heat preservation time is 120-180 min; the rolling temperature of the first two-roller reversible cogging mill is 870-890 ℃; the rolling temperature of the second two-roller reversible cogging mill is 820-850 ℃; the rolling temperature of the finishing mill is 730-780 ℃, the rolling pass of each pass is executed according to the steel rolling pass, and the speed of a cooling bed is more than 100 mm/s; the heating temperature of the second heating furnace is 500-600 ℃.

When titanium alloys with the marks of TA8, TA8-1, TA9, TA9-1, TA10, TA13, TA15, TA18, TC1, TC2, TC3, TC4 and TC10 are adopted for rolling, the heating temperature of a first heating furnace is 1100-1200 ℃, and the heat preservation time is 120-180 min; the rolling temperature of the first two-roller cogging mill is 1050-; the rolling temperature of the second two-roller cogging mill is 950-1000 ℃; the rolling temperature of the finishing mill is 850-; the heating temperature of the second heating furnace is 500-600 ℃.

The first heating furnace is a box type resistance heating furnace.

The second heating furnace is a pipeline type induction heating furnace.

The titanium and titanium alloy section is an H section, a groove section or an angle section.

The section bar produced by the collinear production method has the straightness less than or equal to 2mm/m, the longitudinal torsion angle less than or equal to 2 degrees/m, the allowable deviation of the wall thickness of +/-0.3 mm and the surface roughness Rz of the section bar less than or equal to 80 mu m.

The invention has the beneficial effects that:

1) the production of titanium and titanium alloy profiles is innovatively realized on small and medium-sized profile steel production lines, the technical problem of steel-titanium collinear production is solved, and a method is provided for economically producing the titanium and titanium alloy profiles.

2) The production method is adopted to produce the titanium and titanium alloy H section with the model number of 100 multiplied by 50 (the section area is 1184mm2) -200 multiplied by 200 (the section area is 6353mm2) on a small and medium-sized section steel production line, the flange thickness is 6.3mm-10mm, the straightness is less than or equal to 2mm/m, the longitudinal torsion angle is less than or equal to 2 degrees/m, the allowable deviation of the wall thickness is +/-0.3 mm, and the surface roughness Rz of the section is less than or equal to 80 um.

3) The production method is adopted to produce the titanium and titanium alloy groove section with the model number of [50 multiplied by 37 multiplied by 4.5 multiplied by 7.0- [160 multiplied by 65 multiplied by 8.5 multiplied by 10.0 ] on a small and medium-sized section steel production line, the thickness is 7.0mm-10.0mm, the straightness is less than or equal to 2mm/m, the longitudinal torsion angle is less than or equal to 2 degrees/m, the allowable deviation of the wall thickness is +/-0.3 mm, and the surface roughness Rz of the section is less than or equal to 80 um.

4) The production method is adopted to produce the titanium and titanium alloy angle section bars with the models of the equilateral ∠ 20 model of 20 multiplied by 3- ∠ 160 multiplied by 16 and the inequilateral ∠ 25 multiplied by 16 multiplied by 3- ∠ 160 multiplied by 100 multiplied by 16 on the production line of the small and medium-sized section steel, the thickness is 3mm-16mm, the straightness is less than or equal to 2mm/m, the longitudinal torsion angle is less than or equal to 2 DEG/m, the allowable deviation of the wall thickness is +/-0.3 mm, and the surface roughness Rz of the section bars is less than or equal to 80 um.

5) The production method is suitable for grade titanium and titanium alloy section bars such as TA1, TA2, TA3, TA4, TA5, TA6, TA7, TA8, TA8-1, TA9, TA9-1, TA10, TA13, TA15, TA18, TC1, TC2, TC3, TC4, TC10 and the like.

6) The invention aims at the specificity of titanium and titanium alloy materials and the uniqueness of a hot working process, realizes the collinear efficient and high-quality batch production of steel and titanium, can adopt an original hot continuous rolling production line, hardly generates investment and has strong economical efficiency.

Drawings

The description includes the following figures, the contents shown are respectively:

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings for a purpose of helping those skilled in the art to more fully, accurately and deeply understand the concept and technical solution of the present invention and to facilitate its implementation. In the following embodiments, the terms "first" and "second" do not denote an absolute structural and/or functional distinction or a sequential order of execution, but are merely used for convenience of description.

As shown in figure 1, on the basis of not influencing the production of normal section steel, the small and medium-sized section steel production line equipment is properly modified and the production process is adjusted to adapt to the production of titanium and titanium alloy sections. The first two-roller reversible cogging mill is a BD1 two-roller reversible cogging mill, and the second two-roller reversible cogging mill is a BD2 two-roller reversible cogging mill.

By adopting the collinear production method, if the section steel is produced, the production flow of the section steel is steel blank → heating of a stepping heating furnace → high-pressure water dephosphorization → rolling of a BD1 two-roller reversible cogging mill → rolling of a BD2 two-roller reversible cogging mill → hot saw cutting head → rolling of a 6-frame finishing mill group → double-length flying shear segmentation → cooling of a cold bed → straightening of a straightener in rows → cutting of a cold saw machine → manual inspection and packaging and warehousing.

When producing the titanium and titanium alloy section, the production process of the titanium and titanium alloy section comprises the steps of titanium and titanium alloy blank → protective coating application → box-type resistance heating furnace → BD1 rolling by a two-roller reversible cogging mill → BD2 rolling by a two-roller reversible cogging mill → hot saw cutting head → 6 frame finishing mill rolling → double-length flying shear segmentation → cooling bed cooling (rapid passing) → pipeline type induction heating furnace → straightening machine → row → cold saw cutting sizing → manual inspection and packaging storage.

In the collinear production method, on the basis of not influencing the normal production of the section steel, small and medium-sized section steel production line equipment is properly modified, 1) a small box-type resistance heating furnace and a feeding roller way are added in a heating zone for heating and conveying titanium and titanium alloy blanks; 2) and adding a pipeline type induction heating furnace on a roller way in front of the inlet of the straightening machine, and heating the titanium and titanium alloy profiles to a proper straightening temperature so as to supplement the temperature drop loss of the cooling bed.

When rolling titanium and titanium alloy sectional materials, the production process is properly adjusted to 1) the titanium and titanium alloy blank needs to be coated with a protective coating to protect the surface of the titanium and titanium alloy blank from being seriously oxidized when being heated and influence the surface quality of the rolled titanium material. 2) Heating in a special box-type heating furnace, and solving the problem that the heating temperature required by rolling the titanium and titanium alloy blanks is different from that required by rolling the steel billets. 3) When rolling titanium materials, the descaling machine is closed to remove scale water, the temperature of rolled pieces is prevented from being reduced, the rolling deformation resistance of titanium and titanium alloy profiles is prevented from being increased, and the surface of the rolled pieces is prevented from cracking due to overlarge temperature difference between the inside and the outside of the rolled pieces. 4) And closing the roll lubricating water and the cooling water of the BD1 two-roll cogging mill, the BD2 two-roll cogging mill and the 6-frame finishing mill, and preventing the lubricating water and the cooling water of the rolls from cooling the rolled piece when the titanium material is rolled. 5) The running speed of the cooling bed is increased, and the temperature of the rolled piece on the cooling bed is prevented from being excessively reduced. 6) And (3) secondarily heating the titanium material by using the roller induction heating furnace to make up for the temperature drop on the titanium material cooling bed and heating the titanium material to the straightening temperature.

In order to prevent the rolled piece from being rapidly cooled due to the low temperature of the roller and the roller way when the rolled piece runs on the roller and the roller way when the titanium and titanium alloy section steel is rolled, 3-5 steel products are rolled to preheat the roller and the roller way before the titanium and titanium alloy section steel is rolled.

TA1, TA2, TA3, TA4, TA5, TA6, TA7 and other brands of pure titanium are rolled, the heating temperature is 900-950 ℃, and the heat preservation time is 120-180 min; the rolling temperature of a BD1 two-roller cogging mill is 870-890 ℃; the rolling temperature of a BD2 two-roller cogging mill is 820-850 ℃; the rolling temperature of the 6-frame finishing mill is 730-780 ℃, and the rolling pass of each pass is executed according to the steel rolling pass; the speed of the cooling bed is more than 100 mm/s; the heating temperature of the pipeline type induction heating furnace is 500-600 ℃.

TA8, TA8-1, TA9, TA9-1, TA10, TA13, TA15, TA18, TC1, TC2, TC3, TC4 and TC10 titanium and titanium alloy are rolled at the heating temperature of 1100-; the rolling temperature of the BD1 two-roller cogging mill is 1050-; the rolling temperature of a BD2 two-roller cogging mill is 950-1000 ℃; the rolling temperature of the 6-frame finishing mill is 850-; the heating temperature of the pipeline type induction heating furnace is 500-600 ℃.

The following is illustrated in detail by specific preferred examples: