CN116219313A - Stainless steel composite steel plate and preparation method thereof - Google Patents

Abstract

The application relates to the technical field of stainless steel, in particular to a stainless steel clad steel plate and a preparation method thereof; the base steel plate is used as a substrate of the composite steel plate, the chemical components of the base steel plate comprise C, mn and Cr, and the Mn content of the base steel plate is 15-36%; the chemical components of the base layer steel plate in percentage by mass are as follows: 23.6 [ C ] + [ Mn ]. Gtoreq.28%, 33.5 [ C ] - [ Mn ]. Ltoreq.23% and 28.5 [ C ] +4 [ Cr ]. Ltoreq.57%; the composite steel plate comprises a base steel plate and a multi-layer steel plate, wherein the single side or the double sides of the base steel plate are wrapped by the multi-layer steel plate, and the multi-layer steel plate comprises austenitic stainless steel; the stainless steel composite steel plate prepared by the base steel plate has higher strength and plasticity by controlling the contents of C, mn and Cr, and can also ensure that the base steel plate is of an austenitic structure by controlling the contents of C, mn and Cr, so that the high strength and plasticity of the stainless steel composite steel plate prepared by the base steel plate can be improved under the condition of ensuring low-temperature toughness.

Description

A kind of stainless steel clad steel plate and preparation method thereof

technical field

The present application relates to the technical field of stainless steel, in particular to a stainless steel clad steel plate and a preparation method thereof.

Background technique

Stainless steel clad steel plate is a kind of bimetallic multi-functional material with carbon steel or stainless steel as the matrix, and one or both sides are continuously covered with another stainless steel. It has the characteristics of corrosion resistance or wear resistance, and has good mechanical and formability of the base material, and has a high cost performance, so it can be widely used in petroleum, chemical and other fields.

However, when austenitic stainless steel is combined with carbon steel, the overall elongation after fracture is reduced, and the deformation resistance is weakened, which cannot meet some scenarios that require high-strength plasticity and low-temperature toughness. Therefore, it is necessary to improve the plasticity level of the base material. Since conventional BCC structural carbon steel usually has low plasticity, it is necessary to consider using FCC structural steel. Although the use of standard 201 or 202 series stainless steel as the base steel plate can improve the plasticity of the overall composite steel plate, the cost of raw materials is high, and if The non-standard 200 series stainless steel with a nickel content of about 1% is used. Because the nickel content is too low, the low-temperature impact toughness is not good. Therefore, how to improve the high-strength plasticity of the stainless steel clad plate under the condition of ensuring low-temperature toughness is an urgent need to solve the technology. question.

Contents of the invention

The application provides a stainless steel clad steel plate and its preparation method and application to solve the technical problem in the prior art that it is difficult to improve the high-strength plasticity of the stainless steel clad steel plate under the premise of ensuring low temperature toughness.

In the first aspect, the application provides a base steel plate, the base steel plate is used as the base of the composite steel plate, the chemical composition of the base steel plate includes C, Mn and Cr, and the Mn content of the base steel plate is 15%～ 36%;

In terms of mass percentage, the chemical composition of the base steel plate satisfies: 23.6*[C]+[Mn]≥28%, 33.5*[C]-[Mn]≤23% and 28.5*[C]+4.4*[Cr ]≤57%; Wherein, [C] is the mass percentage of C, [Mn] is the mass percentage of Mn, and [Cr] is the mass percentage of Cr.

Optionally, in terms of mass percentage, the chemical composition of the base steel plate includes: C: 0.05%-0.50%, Mn: 15%-36%, Cr: 0.5%-5.0%.

Optionally, in terms of mass percentage, the chemical composition of the base steel plate also includes: Si: 0.05% to 1.0%, P: 0.005% to 0.40%, S: 0.001% to 0.01%, and the rest are Fe and unavoidable impurities.

In the second aspect, the present application provides a stainless steel clad steel plate, the clad steel plate includes the base steel plate and the clad steel plate described in the first aspect, the clad steel plate is wrapped on one side or both sides of the base steel plate, the The clad steel plate is an austenitic stainless steel plate, so that the strength-plastic product of the stainless steel clad steel plate is ≥40000MPa·%.

Optionally, the thickness of the clad steel plate accounts for 10%-35% of the clad steel plate.

Optionally, in terms of mass percentage, the chemical composition of the clad steel plate includes: C≤0.08%, Si≤0.75%, Mn≤2.0%, Cr: 16.0%-20.0%, Ni: 9.0%-15.0%, Mo: 0.01%～4.0%, N≤0.10%, P≤0.045%, S≤0.030%, the rest is Fe and unavoidable impurities.

In a third aspect, the present application provides a method for preparing the stainless steel clad steel plate described in the second aspect, the method comprising:

Weld the base steel plate and the clad steel plate, and then carry out vacuum treatment to obtain a stainless steel composite slab;

hot rolling, solid solution, pickling and polishing the stainless steel composite slab to obtain stainless steel composite steel coil;

The stainless steel clad steel coil is flattened to obtain a stainless steel clad steel plate.

Optionally, the rough rolling deformation rate in the hot rolling is 60%-70%.

Optionally, the finishing temperature of the hot rolling is 880-950°C.

Optionally, the solid solution temperature is 1040°C to 1100°C.

Compared with the prior art, the above-mentioned technical solutions provided by the embodiments of the present application have the following advantages:

A base steel plate provided in the embodiment of the present application controls the Mn content of the base steel plate, and then controls the relationship between the C content and the Mn content of the base steel plate, the relationship between the C content and the Cr content, and controls the relationship between the C content and the Mn content, It can make the austenite structure content of the base steel plate sufficient, and at the same time control the relationship between the C content and the Cr content, and can ensure that the strong plasticity of the base steel plate is sufficient, so that by controlling the content of C, Mn and Cr, the base steel plate can be controlled. The strength and plasticity make the stainless steel composite steel plate prepared by the base steel plate have high strong plasticity. At the same time, the content of C, Mn and Cr is controlled to ensure that the base steel plate is austenitic. The low-temperature toughness is good, so the high-strength plasticity of the stainless steel clad steel plate prepared from the base steel plate can be improved under the condition of ensuring the low-temperature toughness.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, In other words, other drawings can also be obtained from these drawings without paying creative labor.

Fig. 1 is the result figure of the metallographic structure of the stainless steel clad steel plate cross-section that the embodiment of the present application provides;

Fig. 2 is a schematic flowchart of the method provided by the embodiment of the present application.

Detailed ways

The present invention will be described in detail below in conjunction with specific implementations and examples, and the advantages and various effects of the present invention will be presented more clearly. Those skilled in the art should understand that these specific implementations and examples are used to illustrate the present invention, not to limit the present invention.

Throughout the specification, unless otherwise specified, terms used herein should be understood as commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, this specification shall take precedence.

Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

The technical solutions provided by the embodiments of the present invention are to solve the above-mentioned technical problems, and the general idea is as follows:

In one embodiment of the present application, a base steel plate is provided, the base steel plate is used as a base of a composite steel plate, the chemical composition of the base steel plate includes C, Mn and Cr, and the Mn content of the base steel plate is 15 %~36%;

In terms of mass percentage, the chemical composition of the base steel plate satisfies: 23.6*[C]+[Mn]≥28%, 33.5*[C]-[Mn]≤23% and 28.5*[C]+4.4*[Cr ]≤57%; Wherein, [C] is the mass percentage of C, [Mn] is the mass percentage of Mn, and [Cr] is the mass percentage of Cr.

In the embodiment of the present application, the positive effect of the Mn content of the base steel plate being 15% to 36% is that Mn is a weaker austenite-forming element than C, so in order to obtain a stable austenite structure, a large amount of Mn needs to be added, Make the base steel plate contain a large amount of austenite structure; when the value of the content is greater than the maximum value of the end point of the range, the strength of the steel plate will be too high and the weldability will be reduced; when the value of the content is less than the minimum value of the end point of the range, It will lead to the inability to form austenite structure stably.

The positive effects of 23.6*[C]+[Mn]≥28% and 33.5*[C]-[Mn]≤23% are due to the fact that C is a strong austenite forming element, promotes austenite formation, and stabilizes austenite At the same time, since Mn is a weaker austenite-forming element than C, controlling the relationship between the content of C and Mn can make the austenite structure content of the base steel plate sufficient, and promote the strength and plasticity of the base steel plate to meet expectations.

The positive effect of 28.5*[C]+4.4*[Cr]≤57% is to ensure the ideal strong plasticity; when the value of the dosage is greater than the maximum value of the end point of this range, the adverse effect will be that the strong plasticity is reduced and cannot be obtained High strength and plasticity.

In some optional embodiments, in terms of mass percentage, the chemical composition of the base steel plate includes: C: 0.05%-0.50%, Mn: 15%-36%, Cr: 0.5%-5.0%.

In the embodiment of the present application, the positive effect of the mass percentage of C being 0.05% to 0.50% is that C, a strong austenite-forming element, can replace nickel to a certain extent, promote the formation of austenite, and stabilize the austenite structure. It can improve the strength of steel; when the value of mass percentage is greater or less than the end point value of this range, it will affect the stability and strong plasticity of austenite structure.

The positive effect of the mass percentage of Mn being 15% to 36% is that Mn is a weaker austenite-forming element than C, which can replace nickel to a certain extent, promote the formation of austenite, and stabilize the austenite structure. Improve the strength of steel; when the value of the mass percentage is greater or less than the end point value of this range, it will affect the stability and strong plasticity of the austenite structure of the steel.

The positive effect of the mass percentage of Cr being 0.5% to 5.0% is that Cr can increase the strength and corrosion resistance of the steel to a certain extent; when the value of the mass percentage is greater than or less than the end value of the range, too low a strengthening effect cannot be exerted If it is too high, it is easy to precipitate and affect the corrosion resistance.

In some optional embodiments, in terms of mass percentage, the chemical composition of the base steel plate further includes: Si: 0.05% to 1.0%, P: 0.005% to 0.40%, S: 0.001% to 0.01%, and the rest is Fe and unavoidable impurities.

In the embodiment of the present application, the positive effect of the mass percentage of Si being 0.05% to 1.0% is that within the range of this mass percentage, it can ensure a good deoxidation effect while increasing the strength of the steel, thereby ensuring the strength and plasticity of the base steel plate; content When the content is too low, it will easily lead to poor deoxidation effect and affect the purity of the steel; if the content is too high, it will easily lead to a decrease in plasticity and weldability.

The positive effect of the mass percentage of P being 0.005% to 0.40% is that within the range of this mass percentage, the base steel plate can obtain higher strength and better corrosion resistance; if the content is too low, the strengthening effect is weak, and if the content is too high, the plasticity Deterioration, brittle cracking.

The positive effect of the mass percentage of S being 0.001% to 0.01% is that within the range of this mass percentage, the easy-to-cut performance of the steel can be improved; when the content is too low, the effect of improving the cutting performance cannot be exerted, and if the content is too high, it will easily lead to thermal cracking And other issues.

In one embodiment of the present application, a stainless steel composite steel plate is provided, the composite steel plate includes the base steel plate and the clad steel plate, the base steel plate is wrapped with the clad steel plate on one side or both sides, the clad steel plate The layered steel plate is an austenitic stainless steel plate, so that the strength-plasticity product of the stainless steel clad steel plate is ≥ 40000MPa·%.

In the embodiment of this application, the clad steel plate is controlled to be austenitic stainless steel, combined with the austenite structure formed by the base steel plate, since both the base steel plate and the clad steel plate have austenite structure, the The atomic arrangement is the same and the arrangement of atoms is the same, so the base steel plate and the clad steel plate will be firmly bonded, so that the overall clad steel plate has high strength and plasticity, and at the same time, the austenitic stainless steel has excellent low temperature toughness. The steel plates will be firmly bonded, so that the overall composite steel plate has high-strength plasticity and low-temperature toughness.

In some optional embodiments, the thickness of the clad steel plate accounts for 10%-35% of the thickness of the clad steel plate.

In the embodiment of the present application, the positive effect that the thickness of the clad steel plate accounts for 10% to 35% of the thickness of the clad steel plate is that within this thickness range, the cost and quality of the clad steel plate can be balanced; when the value of the proportion is greater than or less than For the endpoint value of this range, if the proportion is too large, it means that the thickness of the clad steel plate is too large, which will increase the material cost; when the value of the proportion is too small, it means that the thickness of the clad steel plate is too small, which will affect the composite The product quality and service life of the steel plate.

In some optional embodiments, in terms of mass percentage, the chemical composition of the clad steel plate includes: C≤0.08%, Si≤0.75%, Mn≤2.0%, Cr: 16.0%-20.0%, Ni: 9.0 %～15.0%, Mo: 0.01%～4.0%, N≤0.10%, P≤0.045%, S≤0.030%, and the rest are Fe and unavoidable impurities.

In the examples of this application, the positive effect of C≤0.08% is to reduce the precipitation of carbides in the steel, which is beneficial to the improvement of corrosion resistance; Inter-corrosion sensitivity and reduced corrosion resistance.

The positive effect of Si≤0.75% is that within the range of this mass percentage, it can ensure a good deoxidation effect and increase the strength of the clad steel plate; if the content is too high, it will easily lead to a decrease in plasticity and weldability.

The positive effect of Mn≤2.0% is that within the range of this mass percentage, the strength of the austenitic stainless steel can be increased; if the content is too high, the ductility and toughness will easily decrease.

The positive effect of the mass percentage of Cr being 16.0% to 20.0% is that within the range of this mass percentage, the corrosion resistance of austenitic stainless steel can be ensured; if the content is too low, the corrosion resistance is insufficient, and if the content is too high, it will easily lead to carbides or Precipitation of intermetallic compounds reduces corrosion resistance and plasticity.

The positive effect of the mass percentage of Ni being 9.0% to 15.0% is that within the range of this mass percentage, the austenite structure and corrosion resistance can be guaranteed; if the content is too low, stable austenite structure and corrosion resistance cannot be obtained. Insufficient, if the content is too high, the cost will be too high and affect the economy.

The positive effect of the mass percentage of Mo being 0.01% to 4.0% is to improve the pitting corrosion resistance of austenitic stainless steel; if the content is too low, the effect of improving the pitting corrosion resistance cannot be exerted, and if the content is too high, it will easily lead to precipitation, and the cost is too high , Affect the economy.

The positive effect of N≤0.10% is that within the range of this mass percentage, it can ensure better strong plasticity of the clad steel plate; if the content is too high, the plasticity will deteriorate, which is not conducive to the acquisition of high-strength plasticity.

The positive effect of P≤0.045% is that within the range of this mass percentage, it is beneficial to obtain higher plasticity and toughness of the clad steel plate; if the content is too high, it is not conducive to the acquisition of high plasticity and toughness.

The positive effect of S≤0.030% is that within the range of this mass percentage, the hot cracking tendency of the clad steel plate can be improved; if the content is too high, the hot cracking tendency will be aggravated.

In some optional embodiments, the bonding method between the clad steel plate and the base steel plate is metallurgical bonding.

In the embodiment of the present application, the combination mode between the clad steel plate and the base steel plate is controlled, so that the degree of bonding between the clad steel plate and the base steel plate is strong, so that the high-strength plasticity of the base steel plate is combined with the low-temperature toughness of the clad steel plate, so that the overall The composite steel plate has high strength and ductility, but also has low temperature toughness.

In one embodiment of the present application, as shown in Figure 2, a method for preparing a stainless steel clad steel plate is provided, the method comprising:

S1. Weld the base steel plate and the clad steel plate, and then carry out vacuum treatment to obtain a stainless steel composite slab;

S2. hot-rolling, solutionizing, pickling and polishing the stainless steel composite slab to obtain a stainless steel composite steel coil;

S3. Unflattening the stainless steel composite steel coil to obtain a stainless steel composite steel plate.

In some optional embodiments, the solid solution temperature is 1040°C to 1100°C.

In the embodiment of the present application, the positive effect of the solution temperature being 1040°C to 1100°C is that within the temperature range, it can ensure that the alloy elements are fully dissolved and eliminate the adverse effects of precipitation; if the temperature is too low, the alloy elements cannot be fully dissolved. If the temperature is too high, the grains will coarsen, which is detrimental to the strength and toughness.

In some optional embodiments, the rough rolling deformation rate in the hot rolling is 60%-70%.

In the embodiment of the present application, the positive effect of controlling the rough rolling deformation rate of 60% to 70% is that within the range of the deformation rate, the combination between the base steel plate and the clad steel plate can be ensured, so that the strong plasticity of the stainless steel clad steel plate Product ≥ 40000MPa·%.

The positive effect of the hot rolling finish rolling temperature of 880-950°C is that within this temperature range, the strength of the bond between the base steel plate and the clad steel plate can be ensured, and at the same time, the base steel plate and the clad steel plate can be relatively uniform and of reasonable size. The organization ensures that the strength and plasticity of the final composite stainless steel plate are within the expected range.

Table 1 shows the chemical composition of the base steel plate and the clad steel plate and the ratio of the thickness of the clad steel plate in each embodiment and comparative example.

Table 1

According to the data in Table 1, according to the ratio of the thickness of the clad steel plate to 10% to 35% of the clad steel plate thickness, the processed base steel plate and the clad steel plate are selected, and then welded to form a stainless steel clad slab, and then After hot rolling, on-line solid solution, pickling and polishing, it is made into stainless steel clad steel plate. The total thickness of the prepared clad steel plate is 3mm-12mm, and the temperature of on-line solid solution is 1040℃～1100℃. Among them, the single-sided clad steel plate is The steel plate with high Mn content is used as the base steel plate, and 304L or 316L austenitic stainless steel clad steel plate is compounded on either side of the base steel plate; Austenitic stainless steel clad steel plate with 304L or 316L continuous cladding on both sides.

Related experiments:

Various performance tests such as mechanical tension, impact and corrosion were carried out on the steel products obtained in each embodiment and comparative example, and the results are shown in Table 2.

Test methods for related experiments:

Mechanical tension: in accordance with GB/T 6396-2008 "Test Methods for Mechanical and Technological Properties of Composite Steel Plates".

Impact energy at -196°C: According to GB 2106-80 "Metal Charpy V-notch Impact Test Method".

Multi-layer intergranular corrosion: according to the E method in GB/T 4334-2020 "Corrosion of Metals and Alloys - Test Methods for Intergranular Corrosion of Stainless Steel".

Pitting point location: According to GB/T 17899-1999 "Measurement method of stainless steel pitting potential".

Table 2

Specific analysis of Table 2:

Yield strength refers to the elongation strength of the steel when the non-proportional elongation is 0.2%. The more the yield strength meets the standard, the better the mechanical properties of the steel are.

Tensile strength refers to the maximum stress per unit area before the specimen is broken. The more the tensile strength meets the standard, the better the mechanical properties of the steel.

Elongation refers to the percentage of the ratio of the total deformation ΔL of the gauge section after tensile fracture of the sample to the original gauge length L. The more the elongation meets the standard, the better the mechanical properties of the steel.

Impact energy is an index to measure the toughness of materials. It is the ability of materials to absorb plastic deformation energy and fracture energy under impact load. The more the impact energy meets the standard, it means that the steel has good low temperature flexibility.

Shear strength refers to the ability of a material to withstand shear force. The more the shear strength meets the standard, the better the mechanical properties of the steel.

The pitting potential refers to the lowest potential value that can cause pitting corrosion on the passivated metal surface. The more the pitting potential meets the standard, the better the corrosion resistance of the steel.

By the data of embodiment 1-5 as can be known:

The stainless steel clad steel plate provided in the embodiment of the present application wraps the upper clad steel plate by controlling one or both sides of the base steel plate, and controls the Mn content of the base steel plate, and then controls the relationship between the C content and the Mn content of the base steel plate, and the C content and The relationship between Cr content, so as to control the strength and plasticity of the base steel plate, promote the stainless steel composite steel plate to have high strength and plasticity, and then control the clad steel plate to be austenitic stainless steel, and cooperate with the austenite structure formed by the base steel plate to make the overall composite The steel plate has high-strength plasticity and the excellent low-temperature toughness of austenitic stainless steel, so that the overall composite steel plate has high-strength plasticity and low-temperature toughness.

From the data of Comparative Example 1-2, it can be seen that:

If do not adopt the form of the clad steel plate of the present application, and adopt low Mn content, can cause the tensile strength of steel plate to be low, because strong plastic product (MPa·%)=tensile strength * elongation after fracture, therefore low tensile strength Strength results in a low strength-plastic product.

One or more technical solutions in the embodiments of the present application also have at least the following technical effects or advantages:

(1) The base steel plate provided by the embodiment of the present application can control the strength and plasticity of the base steel plate by controlling the content of C, Mn and Cr, so that the stainless steel clad steel plate prepared by the base steel plate has higher strong plasticity , while controlling the content of C, Mn and Cr, it can also ensure that the base steel plate is austenitic. Since the low temperature toughness of the austenite structure is better, it can improve the low temperature toughness of the base steel plate. The high strength and plasticity of the stainless steel clad steel plate.

(2) For the stainless steel clad steel plate provided by the embodiment of the present application, by controlling one side or both sides of the base steel plate to wrap the upper clad steel plate, and controlling the Mn content of the base steel plate, and then controlling the relationship between the C content and the Mn content of the base steel plate, C The relationship between Cr content and Cr content, so as to control the strength and plasticity of the base steel plate, promote the stainless steel composite steel plate to have high strength and plasticity, and then control the clad steel plate to be austenitic stainless steel, and cooperate with the austenite structure formed by the base steel plate, so that the overall The composite steel plate has high strength and plasticity, and austenitic stainless steel has excellent low temperature toughness, so that the overall composite steel plate has high strength plasticity and low temperature toughness.

(3) The stainless steel clad steel plate provided by the embodiment of the application has a room temperature tensile strength ≥ 650MPa, and a strong plastic product ≥

40000MPa%, impact energy at -196°C ≥ 50J, pitting corrosion potential of clad steel plate ≥ 0.40V, high strength and high plasticity, and excellent low temperature impact toughness and corrosion resistance.

(4) The stainless steel composite base steel plate provided in the embodiment of the present application basically does not contain precious elements such as Ni and Mo, so that the composite steel plate has better economy.

(5) The stainless steel clad steel plate provided in the embodiment of the present application has better manufacturability because the base steel plate and the clad steel plate have austenite structure, similar hot workability, and better manufacturability, so the clad steel plate has better hot workability and user performance.

(6) The stainless steel clad steel plate provided by the embodiment of the present application has a higher cost-effective advantage compared with pure stainless steel, and provides high-quality and cost-effective material selection for chemical containers, tanks, etc., and can replace pure 304L, 316L and other austria in many fields Use stainless steel.

(7) The method provided in the embodiment of the present application is easy to operate, and the overall process cost is low.

Description of drawings:

Figure 1 is a schematic diagram of the metallographic structure results of the cross-section of the stainless steel clad steel plate provided in the embodiment of the present application. It can be seen from Figure 1 that in the metallographic structure of the bonding interface between the base steel plate and the clad steel plate, the austenite grains fuse with each other and recrystallize into Integral, that is, the metallurgical bonding is completely achieved at the bonding interface through mutual diffusion between atoms, so the shear strength can be stably maintained above 300MPa.

It should be noted that in this article, relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these No such actual relationship or order exists between entities or operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the statement "comprising..." does not exclude the presence of additional same elements in the process, method, article or device comprising said element.

Neither the endpoints nor any values of the ranges disclosed herein are limited to such precise ranges or values, and these ranges or values are understood to include values approaching these ranges or values. For numerical ranges, between the endpoints of each range, between the endpoints of each range and individual point values, and between individual point values can be combined with each other to obtain one or more new numerical ranges, these values Ranges should be considered as specifically disclosed herein.

The above descriptions are only specific embodiments of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Accordingly, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims (10)

1. A base steel plate, characterized in that, the base steel plate is used as the base of a composite steel plate, the chemical composition of the base steel plate comprises C, Mn and Cr, and the Mn content of the base steel plate is 15% to 36%. ; In terms of mass percentage, the chemical composition of the base steel plate satisfies: 23.6*[C]+[Mn]≥28%, 33.5*[C]-[Mn]≤23% and 28.5*[C]+4.4*[Cr ]≤57%; Wherein, [C] is the mass percentage of C, [Mn] is the mass percentage of Mn, and [Cr] is the mass percentage of Cr. 2. The base steel plate according to claim 1, characterized in that, in terms of mass percentage, the chemical composition of the base steel plate comprises: C: 0.05% to 0.50%, Mn: 15% to 36%, Cr: 0.5% to 5.0%. 3. The base steel plate according to claim 1, characterized in that, in terms of mass percentage, the chemical composition of the base steel plate further comprises: Si: 0.05% to 1.0%, P: 0.005% to 0.40%, S: 0.001 % ~ 0.01%, the rest is Fe and unavoidable impurities. 4. A stainless steel composite steel plate, characterized in that the composite steel plate comprises the base steel plate and the clad steel plate as claimed in any one of claims 1-3, and the clad steel plate is wrapped on one or both sides of the base plate Layered steel plate, the clad steel plate is an austenitic stainless steel plate, so that the strength-plasticity product of the stainless steel clad steel plate is ≥ 40000MPa·%. 5. The clad steel plate according to claim 4, characterized in that, the thickness of the clad steel plate accounts for 10%-35% of the clad steel plate. 6. The clad steel plate according to claim 4, characterized in that, in terms of mass percentage, the chemical composition of the clad steel plate comprises: C≤0.08%, Si≤0.75%, Mn≤2.0%, Cr: 16.0% ～20.0%, Ni: 9.0%～15.0%, Mo: 0.01%～4.0%, N≤0.10%, P≤0.045%, S≤0.030%, and the rest are Fe and unavoidable impurities. 7. A method for preparing the stainless steel clad steel plate according to any one of claims 1-6, characterized in that the method comprises: Weld the base steel plate and the clad steel plate, and then carry out vacuum treatment to obtain a stainless steel composite slab; hot rolling, solid solution, pickling and polishing the stainless steel composite slab to obtain stainless steel composite steel coil; The stainless steel clad steel coil is flattened to obtain a stainless steel clad steel plate. 8. The method according to claim 7, characterized in that the rough rolling deformation rate in the hot rolling is 60%-70%. 9. The method according to claim 7, characterized in that the finishing temperature of the hot rolling is 880-950°C. 10. The method according to claim 7, characterized in that the temperature of the solid solution is 1040°C-1100°C.

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