阅读说明：本技术 一种多层轧制复合板及其制造方法 (Multilayer rolled composite plate and manufacturing method thereof ) 是由 薛鹏 朱晓东 闫博 焦四海 于 2019-11-27 设计创作，主要内容包括：本发明公开了一种多层轧制复合板,其包括设于两相邻的复合层之间的过渡层,所述过渡层为各向异性薄钢板。此外,本发明还公开了上述的多层轧制复合板的制造方法,其包括步骤：(1)在相邻的复合层之间设置过渡层以组坯,各层之间抽真空；(2)复合轧制：将坯料加热至1100-1260℃,保温0.6小时以上,然后采用Ar3以上温度热轧,控制终轧温度大于820℃,轧后以30-100℃/s的速度冷却,然后进行卷取,控制卷取温度为20-750℃。本发明所述的多层轧制复合板可以根据成分和工艺的不同大幅度变换,可以实现从150MPa到1700MPa的不同强度级别,为整体钢板提供不同特定力学性能基础。(The invention discloses a multilayer rolled composite plate which comprises a transition layer arranged between two adjacent composite layers, wherein the transition layer is an anisotropic thin steel plate. In addition, the invention also discloses a manufacturing method of the multilayer rolled composite plate, which comprises the following steps: (1) arranging a transition layer between adjacent composite layers for assembly, and vacuumizing the space between the layers; (2) and (3) composite rolling: heating the blank to 1100-1260 ℃, preserving heat for more than 0.6 h, then hot rolling at the temperature of more than Ar3, controlling the finishing temperature to be more than 820 ℃, cooling at the speed of 30-100 ℃/s after rolling, and then coiling, wherein the coiling temperature is controlled to be 20-750 ℃. The multilayer rolled composite plate can be greatly changed according to different components and processes, can realize different strength levels from 150MPa to 1700MPa, and provides different specific mechanical property bases for the whole steel plate.)

1. The multilayer rolled composite plate is characterized by comprising a transition layer arranged between two adjacent composite layers, wherein the transition layer is an anisotropic thin steel plate.

2. The multi-layer rolled composite panel according to claim 1, wherein the anisotropic steel sheet is a cold rolled steel sheet or a hot rolled pickled steel sheet.

3. The multi-layer rolled composite panel according to claim 1, wherein said anisotropic steel sheet is oriented to a degree that, prior to assembly, satisfies: AI is more than or equal to 1.25 and more than or equal to 1.05.

4. The multi-layer rolled composite panel according to claim 1, wherein said transition layer has one or more layers.

5. The multi-layer rolled composite plate according to claim 1, wherein each of said thin anisotropic steel plates has a thickness of less than 5% of the total thickness of the multi-layer rolled composite plate.

6. The multilayer rolled composite plate according to claim 1, wherein each of said thin anisotropic steel plates has a thickness of 0.5 to 10.0 mm.

7. The multilayer rolled composite plate according to claim 6, wherein each of said thin anisotropic steel plates has a thickness of 1 to 3 mm.

8. The multi-layer rolled composite panel according to claim 1 wherein at least one surface of said multi-layer rolled composite panel has a metallic or non-metallic coating.

9. A method of manufacturing a multi-layer rolled composite panel according to any of claims 1-8, characterized in that it comprises the steps of:

(1) arranging a transition layer between adjacent composite layers for assembly, and vacuumizing the space between the layers;

(2) and (3) composite rolling: heating the blank to 1100-1260 ℃, preserving heat for more than 0.6 h, then hot rolling at the temperature of more than Ar3, controlling the finishing temperature to be more than 820 ℃, cooling at the speed of 30-100 ℃/s after rolling, and then coiling, wherein the coiling temperature is controlled to be 20-750 ℃.

10. The method of claim 9, further comprising the step of (3) cold rolling.

11. The method of manufacturing of claim 10, further comprising the step (4) of annealing: the soaking temperature is 700-880 ℃, then the temperature is cooled to the rapid cooling starting temperature of 600-770 ℃ at the speed of 3-20 ℃/s, and then the temperature is cooled to 550 ℃ at the speed of 40-1000 ℃/s.

12. The method of manufacturing of claim 11, further comprising the step (5) of tempering: the tempering temperature is 150-550 ℃, and the tempering time is 100-400 s.

13. The manufacturing method according to any one of claims 9 to 12, further comprising a flattening step.

Technical Field

The invention relates to a steel plate and a manufacturing method thereof, in particular to a rolled composite plate and a manufacturing method thereof.

Background

The rolling compounding is a special rolling mode that two or more than two metal plates with clean surfaces are mutually contacted, the surface layer of a metal contact surface is damaged by utilizing a shearing force generated by rolling under high-temperature large deformation, fresh metal is extruded out, and the interface metallurgical bonding is realized under the action of external force, so that the rolling compounding method is a common method for producing the composite plate, and the process is mature and stable.

The multilayer metal rolling composite plate is formed by connecting more than two metals in a hot rolling composite mode, so that the cost can be reduced, and the physical and chemical properties which are not possessed by single component metal can be obtained. For example, combining a metal having high strength with a metal having high toughness can unify the toughness of the material, and can be used for manufacturing various engineering structural members.

Due to the influence of production environment and the limitation of production equipment capacity, the composite plate has the defects of easy generation of oxides and bonding inhibition at the bonding interface, easy diffusion of elements in the hot rolling and rolling compounding process, and even influences the respective performances of the base material and the composite material under severe conditions. For example, a clad plate obtained by compounding 22MnB5 as a base material and IF steel as a clad material, 22MnB5 provides a strength base, and IF steel improves surface formability, but severe C diffusion causes a decrease in the strength of the 22MnB5 layer and a decrease in the toughness of the IF steel layer at the time of compounding.

Disclosure of Invention

One of the purposes of the invention is to provide a multi-layer rolled composite plate, which can be greatly changed according to different components and processes, can realize different strength levels from 150MPa to 1700MPa, and provides different specific mechanical property bases for the whole steel plate.

In order to achieve the above object, the present invention provides a multi-layer rolled composite plate, which comprises a transition layer disposed between two adjacent composite layers, wherein the transition layer is an anisotropic thin steel plate.

In the technical scheme of the invention, the anisotropic thin steel plate can play a role in blocking the diffusion of components among layers of other composite plates. In addition, the anisotropic steel sheet may function to enhance the adhesive strength between layers of the composite panel.

Further, in the multi-layer rolled composite sheet according to the present invention, the anisotropic thin steel sheet is a cold-rolled steel sheet or a hot-rolled pickled steel sheet.

In the above embodiment, the degree of orientation of the anisotropic steel sheet can be controlled by controlling the cold rolling reduction, the annealing temperature, or the hot finish rolling temperature.

Further, in the multilayer rolled composite plate according to the invention, the degree of orientation of the anisotropic steel sheet before assembly satisfies: AI is more than or equal to 1.25 and more than or equal to 1.05.

In the technical scheme of the invention, when the orientation degree of the anisotropic thin steel plate is higher, the density of defects in grains is increased, the recrystallization speed and the grain growth speed of austenite are increased, and the recrystallization driving force in the direction vertical to the steel plate is greater than that in the direction parallel to the steel plate, so that the higher orientation degree of the steel plate is very favorable for the anisotropic thin steel plate to be used as a transition layer in the hot rolling and heating soaking process of the steel plate, an oxide film on the surface of a base material is dissolved when the steel plate is assembled, and the anisotropic thin steel plate is rapidly metallurgically combined with other layers of the composite plate. Considering that the degree of orientation is too large, the diffusion speed of the components of the anisotropic steel sheet in the composite layer increases, and it is not easy to control the diffusion of the components between the layers, based on which the degree of orientation of the anisotropic steel sheet before assembling is controlled to satisfy: AI is more than or equal to 1.25 and more than or equal to 1.05.

Further, in the multi-layer rolled composite panel according to the present invention, the transition layer has one or more layers.

Further, in the multi-layer rolled composite plate according to the present invention, the thickness of each anisotropic thin steel sheet is less than 5% of the total thickness of the multi-layer rolled composite plate.

Further, in the multilayer rolled composite plate of the invention, the thickness of each layer of anisotropic thin steel plate is 0.5-10.0 mm.

Further, in the multilayer rolled composite plate of the invention, the thickness of each layer of anisotropic thin steel plate is 1-3 mm.

Further, in the multi-layer rolled composite plate according to the present invention, at least one surface of the multi-layer rolled composite plate has a metal or nonmetal plating layer.

Of course, in some other embodiments, the surface of the multi-layer rolled composite plate may not have a plating layer.

Accordingly, another object of the present invention is to provide a method for manufacturing a multilayer rolled composite panel as described above, by means of which a multilayer rolled composite panel can be obtained.

In order to achieve the above object, the present invention provides a method for manufacturing a multi-layer rolled composite plate, comprising the steps of:

(1) arranging a transition layer between adjacent composite layers for assembly, and vacuumizing the space between the layers;

(2) and (3) composite rolling: heating the blank to 1100-1260 ℃, preserving the heat for more than 0.6 h, controlling the finish rolling temperature to be more than 820 ℃, cooling at the speed of 30-100 ℃/s after rolling, and then coiling, wherein the coiling temperature is controlled to be 20-750 ℃.

Further, the manufacturing method of the present invention further includes step (3) of cold rolling.

Further, the manufacturing method of the present invention further includes the step (4) of annealing: the soaking temperature is 700-880 ℃, then the temperature is cooled to the rapid cooling starting temperature of 600-770 ℃ at the speed of 3-20 ℃/s, and then the temperature is cooled to the temperature of 150-550 ℃ at the speed of 40-1000 ℃/s.

Further, in the manufacturing method of the present invention, the method further includes the step (5) of tempering: the tempering temperature is 150-550 ℃, and the tempering time is 100-400 s.

Further, in the manufacturing method of the present invention, a flattening step is further included.

Compared with the prior art, the multilayer rolled composite plate has the following advantages and beneficial effects:

the multilayer rolled composite plate can be greatly changed according to different components and processes, can realize different strength levels from 150MPa to 1700MPa, and provides different specific mechanical property bases for the whole steel plate.

In addition, the manufacturing method of the present invention also has the advantages and beneficial effects described above.

Drawings

Fig. 1 shows the structure of a comparative composite panel of comparative example 1.

Fig. 2 shows the structure of the multi-layer rolled composite plate of example 1.

Fig. 3 is a microstructure metallographic image of a comparative composite plate according to comparative example 1.

Fig. 4 is a microstructure metallographic image of a multi-layer rolled composite plate according to example 1.

Detailed Description

The multilayer rolled composite plate and the method for manufacturing the same according to the invention will be further explained and illustrated with reference to the drawings and the specific examples of the present description, which, however, do not unduly limit the technical solution of the invention.

Examples 1 to 6 and comparative example 1

The multi-layer rolled composite panels of examples 1-6 were prepared using the following steps:

(1) a transition layer is arranged between adjacent composite layers for assembly, and vacuum is pumped between the layers, wherein the mass percentages of the blank layers are shown in table 1. The composite layer includes a substrate layer and a composite layer.

(2) And (3) composite rolling: heating the blank to 1100-1260 ℃, preserving the heat for more than 0.6 h, controlling the finish rolling temperature to be more than 820 ℃, cooling at the speed of 30-100 ℃/s after rolling, and then coiling, wherein the coiling temperature is controlled to be 20-750 ℃.

In some embodiments, step (3) cold rolling may also be included.

In other embodiments, the annealing step (4) may be further included: the soaking temperature is 700-880 ℃, then the temperature is cooled to the rapid cooling starting temperature of 600-770 ℃ at the speed of 3-20 ℃/s, and then the temperature is cooled to the temperature of 150-550 ℃ at the speed of 40-1000 ℃/s.

In some other embodiments, the method may further comprise the step (5) of tempering: the tempering temperature is 150-550 ℃, and the tempering time is 100-400 s.

In some more preferred embodiments, a step of leveling may also be included.

Table 1 lists the mass percent ratios of the chemical elements for the multi-layer rolled composite panels of examples 1-6 and the comparative composite panel of comparative example 1.

TABLE 1 (wt%, balance Fe and other unavoidable impurities)

Table 2 lists specific process parameters for the multi-layer rolled composite panels of examples 1-6 and the comparative composite panel of comparative example 1.

Table 2.

Table 3 shows the relevant performance parameters and advantages after compounding for the clad steel sheets of examples 1-6.

Table 3.

Fig. 1 shows the structure of a comparative composite panel of comparative example 1.

Fig. 2 shows the structure of the multi-layer rolled composite plate of example 1.

As can be seen from fig. 1 and 2, compared to the comparative composite board of comparative example 1, which only has a three-layer structure (including a substrate layer 2 and two composite layers 1 combined with the substrate layer 2), the multi-layer rolled composite board of example 1 of the present application has a transition layer 3 between the composite layers 1 and the substrate layer 2, and the transition layer 3 is an anisotropic thin steel sheet.

It is noted that in some other embodiments, the transition layer 3 may also have multiple layers.

The anisotropic thin steel plate of the transition layer 3 is a cold-rolled steel plate or a hot-rolled pickled steel plate, and the orientation degree before assembly satisfies the following conditions: AI is more than or equal to 1.25 and more than or equal to 1.05, and the thickness of each layer of the anisotropic thin steel plate is less than 5 percent of the total thickness of the multi-layer rolled composite plate.

And in some other embodiments at least one surface of the multi-layer rolled composite sheet has a metallic or non-metallic coating.

Fig. 3 is a microstructure metallographic image of a comparative composite plate according to comparative example 1.

Fig. 4 is a microstructure metallographic image of a multi-layer rolled composite plate according to example 1.

As can be seen from the combination of fig. 3 and 4, the C diffusion between the clad layer 1 and the substrate layer 2 is significantly improved for the multi-layer rolled composite plate of example 1 compared to the comparative composite plate of comparative example 1 because: the C content plays a crucial role in strength, the diffusion of C atoms belongs to interstitial diffusion, the diffusion rate is high, particularly when large carbon potential differences exist on two sides of a composite interface, the C atoms are easy to diffuse, the performances of the base material layer 2 and the composite material layer 1 are even affected under severe conditions, the strength of the base material layer is reduced due to the severe C diffusion, the toughness of the composite layer is reduced, the anisotropic thin steel plate with the C content between the base material layer 2 and the composite material layer 1 is selected as the transition layer 3, the carbon potential differences on two sides of the composite interface can be effectively reduced, and the diffusion of C is greatly slowed down.

The thickness of the transition layer 3 should be relatively thin because: if the thickness of the transition layer 3 is thick, the bonding strength after rolling and compounding depends on the strength of the material of the transition layer 3, and if the strength of the transition layer 3 is low, the bonding performance of the metal composite plate is generally reduced. If the thickness of the transition layer 3 is too thin, the purpose of preventing the diffusion of the element is not achieved.

As can be seen from fig. 4, the composite interface of the embodiment 1 has better bonding performance.

In conclusion, the multilayer rolled composite plate can be greatly changed according to different components and processes, can realize different strength levels from 150MPa to 1700MPa, and provides different specific mechanical property bases for the whole steel plate.

In addition, the manufacturing method of the present invention also has the advantages and beneficial effects described above.

It should be noted that the prior art in the protection scope of the present invention is not limited to the examples given in the present application, and all the prior art which is not inconsistent with the technical scheme of the present invention, including but not limited to the prior patent documents, the prior publications and the like, can be included in the protection scope of the present invention.

In addition, the combination of the features in the present application is not limited to the combination described in the claims of the present application or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradictory to each other.

It should also be noted that the above-mentioned embodiments are only specific embodiments of the present invention. It is apparent that the present invention is not limited to the above embodiments and similar changes or modifications can be easily made by those skilled in the art from the disclosure of the present invention and shall fall within the scope of the present invention.