CN109835013B - High-strength wear-resistant composite steel plate and manufacturing method thereof - Google Patents
High-strength wear-resistant composite steel plate and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a high-strength wear-resistant composite steel plate, which comprises a substrate layer and a composite layer compounded on the substrate layer on one side or two sides; the base plate layer is a carbon steel layer, the composite layer is a medium manganese steel layer, and the content of Mn element in the composite layer is 5.00-10.00 wt.%. In addition, the invention also discloses a manufacturing method of the high-strength wear-resistant composite steel plate, which comprises the following steps: (1) preparing a carbon steel laminate slab and a medium manganese steel layer slab; (2) assembling; (3) heating: heating to 1150-1250 deg.c and maintaining for 1-3 hr; (4) and (3) composite rolling: the initial rolling temperature is 1120-1220 ℃, the final rolling temperature is 1050-1200 ℃, and the reduction rate is controlled to be more than or equal to 50%; (5) and cooling after rolling. The high-strength wear-resistant composite steel plate disclosed by the invention has the advantages of high strength and hardness, good toughness, high wear resistance and excellent comprehensive performance.
Description
Technical Field
The invention relates to a steel plate and a manufacturing method thereof, in particular to a high-strength wear-resistant composite steel plate and a manufacturing method thereof.
Background
The high manganese steel has low wear resistance due to insufficient work hardening capacity under the conditions of low and medium impact wear stress. Compared with high manganese steel, the medium manganese steel has high work hardening speed when the impact load is small, can quickly form a high-hardness stable hardened layer, greatly improves the capability of resisting impact abrasive wear, but can not be applied to key structure wear-resistant parts needing bearing due to low self-strength hardness, and is easy to deform in the actual application process to cause part failure. Usually, medium manganese steel adopts the casting mode production, however, has the inside quality of ingot casting poor, the defect is many, the shortcoming of easy appearance fracture in the use to reduce the life of product by a wide margin, increase use cost, be unfavorable for product marketing.
Based on the above, a steel plate is expected to be obtained, and the steel plate is formed by compounding high manganese steel and low alloy high-strength steel, so that the strength and hardness of the material can be improved, the defect of serious deformation of the medium manganese steel in the stress process can be avoided, the comprehensive performance of the material can be greatly improved, and the service life of the material can be prolonged.
Disclosure of Invention
One of the purposes of the invention is to provide a high-strength wear-resistant composite steel plate which has the advantages of high strength and hardness, good toughness, excellent wear resistance, excellent comprehensive performance and wide application range.
In order to achieve the purpose, the invention provides a high-strength wear-resistant composite steel plate which comprises a substrate layer and a composite layer compounded on the substrate layer on one side or two sides; the base plate layer is a carbon steel layer, the composite layer is a medium manganese steel layer, and the content of Mn element in the composite layer is 5.00-10.00 wt.%. .
In the technical scheme of the invention, the high-strength wear-resistant composite steel plate obtained by adopting a rolling composite mode has excellent mechanical properties (such as high strength and hardness) of a substrate layer, avoids the defects of low strength and hardness and easy deformation of a composite layer before processing and hardening, and exerts the characteristic of high wear resistance of the composite layer, so that the composite steel plate has excellent comprehensive properties and is beneficial to wide application in engineering.
In addition, the rolling compounding is adopted, so that the thickness of the steel plate of the composite layer (medium manganese steel) can be reduced, the material consumption can be reduced, and the material cost can be reduced.
Further, in the high-strength wear-resistant composite steel plate, the carbon steel layer comprises the following chemical elements in percentage by mass:
C：0.10～0.25wt.％；Si：0.10～1.00wt.％；Mn：0.40～2.00wt.％；Cr：0.01～2.00wt.％；Mo：0.01～1.00wt.％；Ni：0.01～2.00wt.％；Nb：0.001～0.080wt.％；B：0.0005～0.0040wt.％；Al：0.010～0.080wt.％；
the balance being Fe and other unavoidable impurities.
The design principle of each chemical element of the carbon steel layer in the high-strength wear-resistant composite steel plate is as follows:
c: carbon is the most basic and important element in wear-resistant steel, and improves the strength and hardness of the steel through solid solution strengthening and precipitation strengthening, but the excessive mass percent of carbon reduces the toughness and plasticity. Therefore, in the high-strength wear-resistant composite steel plate, the mass percent of C in the carbon steel layer is controlled to be 0.10-0.25%.
Si: silicon with a proper mass percentage is a beneficial deoxidizer in steel, can form calcium-aluminum silicate inclusions which are easy to float upwards together with calcium and aluminum in the steel, and improves the purity of the steel. Silicon is dissolved in ferrite and austenite in a solid solution to improve the hardness and the strength of the ferrite and the austenite, but when the mass percent of the silicon is too high, the toughness of the steel is reduced rapidly, so that the mass percent of Si in the carbon steel layer is controlled to be 0.10-1.00% in the high-strength wear-resistant composite steel plate.
Mn: in the technical scheme of the invention, the addition of Mn is beneficial to improving the hardenability of steel, so that the mass percent of Mn is controlled to be 0.40-2.00%.
Cr: chromium may increase the hardenability of steel and increase the strength and hardness of steel. In addition, the chromium can prevent or slow down the precipitation and aggregation of carbides during tempering, and the tempering stability of the steel can be improved. Therefore, the mass percent of Cr in the carbon steel layer is controlled to be 0.01-2.00% in the high-strength wear-resistant composite steel plate.
Mo: the molybdenum can refine grains and improve the strength and toughness of the steel. Meanwhile, molybdenum is an element for reducing the tempering brittleness, and the tempering stability can be improved. Therefore, in the high-strength wear-resistant composite steel plate, the mass percent of Mo in the carbon steel layer is controlled to be 0.01-1.00%.
Ni: nickel has the effect of obviously reducing the cold-brittleness transition temperature, but too high mass percent of nickel easily causes that oxide scales on the surface of the steel plate are difficult to fall off, and the production cost is obviously increased by adding too much nickel. Therefore, the mass percent of Ni in the carbon steel layer of the high-strength wear-resistant composite steel plate is controlled to be 0.01-2.00%.
Nb: the niobium improves the strength and toughness of the steel through grain refinement, so that in the technical scheme of the invention, the mass percent of Nb in the carbon steel layer is controlled to be 0.001-0.080%.
B: boron increases the hardenability of steel, but too high mass percent of boron causes hot brittleness and affects the welding performance and hot workability of steel, so that the mass percent of B in the carbon steel layer is controlled to be 0.0005-0.0040% in the high-strength wear-resistant composite steel plate.
Al: the nitrogen in the aluminum and the steel can form fine and insoluble AlN particles, and the crystal grains of the steel are refined. In addition, the aluminum can refine crystal grains of the steel, fix nitrogen and oxygen in the steel, reduce the sensitivity of the steel to gaps, reduce or eliminate the aging phenomenon of the steel and improve the toughness of the steel, so that the mass percent of Al of the carbon steel layer in the high-strength wear-resistant composite steel plate is controlled to be 0.010-0.080%.
It should be noted that the impurities in the high-strength wear-resistant composite steel plate of the present invention are not beneficial to the performance improvement of the steel plate, and simultaneously, the quality and the service life of the steel plate are also reduced, however, the production cost is greatly increased by controlling the impurities too tightly. In view of the above, the inevitable impurities such as P, S, N, H and O in the carbon steel layer in the high-strength high-hardness clad steel sheet according to the present invention are controlled to be: p < 0.030%; s is less than 0.010%; n is less than or equal to 0.0080 percent; o is less than or equal to 0.0080 percent; h is less than or equal to 0.0004 percent.
Further, in the high strength wear resistant composite steel sheet according to the present invention, the chemical element of the carbon steel layer further has at least one of 0 < V ≦ 0.080 wt.% and 0 < Ti ≦ 0.060 wt.%.
Further, in the high-strength wear-resistant composite steel plate of the invention, each chemical element in the carbon steel layer also satisfies at least one of the following formulas: 0.20 percent to (Cr/5+ Mn/6+50B) to 0.55 percent, 0.10 percent to (Mo/3+ Ni/5+2Nb) to 0.42 percent and 0.02 percent to (Al + Ti) to 0.12 percent.
In the above formulae, each element represents the mass percentage of the corresponding element.
Further, in the high-strength wear-resistant composite steel plate, the microstructure of the carbon steel layer is martensite + retained austenite.
Furthermore, in the high-strength wear-resistant composite steel plate, the tensile strength of the carbon steel layer is more than or equal to 1200MPa, the elongation is more than or equal to 14%, the Brinell hardness is more than or equal to 400HB, and the Charpy V-shaped longitudinal impact energy at-40 ℃ is more than or equal to 60J.
Further, in the high-strength wear-resistant composite steel plate, the chemical elements of the medium manganese steel layer are as follows by mass percent:
c: 0.80-1.50 wt.%; si: 0.20-1.50 wt.%; mn: 5.00-10.00 wt.%; cr: 0.01-3.00 wt.%; mo: 0.01-1.00 wt.%; ti is less than or equal to 0.060 percent; al: 0.010-0.080 wt.%; the balance being Fe and unavoidable impurities.
The design principle of each chemical element of the medium manganese steel layer in the high-strength wear-resistant composite steel plate is as follows:
c: carbon is the most basic and important element in the wear-resistant steel, the strength and the hardness of the steel are improved through solid solution strengthening and precipitation strengthening, and the mass percent of the carbon in the medium manganese steel layer in the high-strength wear-resistant composite steel plate is controlled to be 0.80-1.50%.
Si: proper silicon is a beneficial deoxidizer in steel, can form calcium-aluminum silicate inclusions which are easy to float upwards together with calcium and aluminum in the steel, and improves the purity of the steel. Silicon solid-soluted in ferrite and austenite increases their hardness and strength, however, too high a mass percentage of silicon results in a drastic decrease in the toughness of the steel. Therefore, the mass percent of Si in the medium manganese steel layer of the high-strength wear-resistant composite steel plate is controlled to be 0.20-1.50%.
Mn: the hardenability of the steel is improved by manganese, and the mass percent of Mn in the medium manganese steel layer of the high-strength high-hardness composite steel plate is controlled to be 5.00-10.00%.
Cr: chromium may increase the hardenability of steel and increase the strength and hardness of steel. The chromium can prevent or slow down the precipitation and aggregation of carbides during tempering, and the tempering stability of the steel can be improved. Therefore, the mass percent of Cr in the medium manganese steel layer of the high-strength wear-resistant composite steel plate is controlled to be 0.01-3.00%.
Mo: the molybdenum can refine grains and improve the strength and toughness of the steel. Meanwhile, molybdenum is an element for reducing the tempering brittleness, and the tempering stability can be improved. Therefore, the mass percent of Mo in the medium manganese steel layer of the high-strength wear-resistant composite steel plate is controlled to be 0.01-1.00%.
Ti: titanium is one of the strong carbide formers, and forms fine TiC particles with carbon. The TiC particles are fine and distributed in a crystal boundary, so that the effect of refining crystal grains is achieved, and the hard TiC particles improve the wear resistance of the steel. Therefore, the mass percent of Ti in the medium manganese steel layer of the high-strength wear-resistant composite steel plate is controlled to be less than or equal to 0.060 percent.
Al: the nitrogen in the aluminum and the steel can form fine and insoluble AlN particles, and the crystal grains of the steel are refined. The aluminum can refine the crystal grains of the steel, fix nitrogen and oxygen in the steel, reduce the sensitivity of the steel to gaps, reduce or eliminate the aging phenomenon of the steel and improve the toughness of the steel. Therefore, in the technical scheme of the invention, the mass percent of Al in the medium manganese steel layer is controlled to be 0.010-0.08%.
In addition, it should be noted that, in the high strength wear-resistant clad steel sheet according to the present invention, the inevitable impurities such as P, S in the middle manganese steel layer are controlled to be: p < 0.030%; s is less than 0.010%.
Further, in the high-strength wear-resistant composite steel plate, the microstructure of the medium manganese steel layer is austenite.
Furthermore, in the high-strength wear-resistant composite steel plate, the tensile strength of the medium manganese steel layer is more than or equal to 500MPa, the elongation is more than or equal to 15%, the Brinell hardness is more than or equal to 180HB, and the Charpy U-shaped longitudinal impact energy at-40 ℃ is more than or equal to 50J.
Accordingly, another object of the present invention is to provide a method for manufacturing the above-mentioned high-strength wear-resistant composite steel plate, wherein the wear-resistant composite steel plate obtained by the manufacturing method not only enhances the strength and hardness of the steel plate, but also has high wear resistance and high toughness, and the steel plate has excellent comprehensive properties.
In order to achieve the above object, the present invention provides a method for manufacturing the high strength wear-resistant clad steel plate, comprising the steps of:
(1) preparing a carbon steel laminate slab and a medium manganese steel layer slab;
(2) assembling;
(3) heating: heating to 1150-1250 deg.c and maintaining for 1-3 hr;
(4) and (3) composite rolling: the initial rolling temperature is 1120-1220 ℃, the final rolling temperature is 1050-1200 ℃, and the reduction rate is controlled to be more than or equal to 50%;
(5) and cooling after rolling.
In the step (1) of the manufacturing method, the carbon steel laminate plate blank and the medium manganese steel layer plate blank can be prepared by adopting continuous casting or die casting. In some preferred embodiments, during continuous casting, the continuous casting and pulling speed is controlled, the continuous casting and pulling speed is ensured to be less than or equal to 1.0m/min, and the effects of uniform internal components of a casting blank and good surface quality are achieved. In other embodiments, in die casting, the ingot is rolled into a bloom and then cooled at a slow rate to avoid cracking due to martensitic transformation.
In addition, before assembly, the carbon steel laminate slab and the medium manganese steel layer slab can be pretreated, for example, the single-side surface iron oxide scale of each slab is cleaned by adopting a mechanical method, then four edges of the single-side surface cleaning are beveled, and the slab with the cleaned surface is placed to face the cleaning surface.
When the manufacturing method of the invention is adopted, the plate blanks are jointed and then welded, connected and sealed, a vacuum channel is reserved at the edge part, and the vacuum extraction treatment is carried out on the welded and sealed composite assembly.
The reason why the heating temperature used in step (3) is controlled to 1150 to 1250 ℃ is that, on the one hand, the second phase particles such as V (C, N) are dissolved and Ti (C, N) is partially dissolved, and a uniform austenitized structure is obtained while the austenite grains are not grown.
In addition, in addition to controlling the heating temperature and the holding time of the plate blank of the plate in the step (3) to ensure the smooth rolling of the plate blank, the temperature and the deformation in the rolling process in the step (4) are important parameters for ensuring the shape and the performance of the steel plate, wherein the initial rolling temperature is controlled to be 1120-1220 ℃, the final rolling temperature is controlled to be 1050-1200 ℃, and the rolled steel plate is directly cooled by water or air to obtain a uniform structure.
Further, in the manufacturing method of the invention, the step (5) adopts water cooling to room temperature-300 ℃, and the cooling speed is more than or equal to 10 ℃/s.
Further, in the manufacturing method of the present invention, the step (5) is cooled to room temperature by air cooling, and then the step (6): and (5) off-line quenching.
Further, in the production method of the present invention, in the step (6), the quenching temperature is 1050 to 1100 ℃ and the holding time is (1.5 × t) min, where t represents a plate thickness and a unit parameter thereof is mm.
Compared with the prior art, the high-strength wear-resistant composite steel plate has the following characteristics:
1. from the chemical composition, the alloy components of the high-strength wear-resistant composite steel plate mainly comprise medium-low carbon and medium-low alloy, and the refining and strengthening characteristics of microalloy elements such as Mn, Cr, Mo, Nb and Ti are fully utilized to ensure that the steel plate has good mechanical properties and the like.
2. From the production process, the technical scheme of the invention carries out composite assembly on the carbon steel layer and the medium manganese steel layer, improves the structure thinning and strengthening effects by controlling the process parameters, particularly the control on the opening and finishing rolling temperature, the reduction rate and the cooling speed, and further reduces the content of carbon and alloy elements, thereby obtaining the steel plate with excellent mechanical property, welding property and the like. In addition, the manufacturing method of the invention has the characteristics of short production flow, high efficiency, energy conservation and low cost.
3. From the aspect of product performance, the carbon steel layer of the high-strength wear-resistant composite steel plate has high strength, high hardness and high toughness, and the mechanical property of the carbon steel layer is as follows: the tensile strength is more than or equal to 1200MPa, the yield strength is more than or equal to 1000MPa, the elongation is more than or equal to 14 percent, the Brinell hardness is more than or equal to 400HB, and the Charpy V-shaped longitudinal impact energy at minus 40 ℃ is more than or equal to 60J; mechanical properties of the medium manganese steel layer: the hardness is more than or equal to 180HB, the tensile strength is more than or equal to 500MPa, the elongation is more than or equal to 13 percent, and the Charpy U-shaped longitudinal impact energy at minus 40 ℃ is more than or equal to 40J.
4. From the aspect of microstructure, the high-strength wear-resistant composite steel plate fully utilizes the addition of alloy elements and process conditions to control the carbon steel layer to obtain martensite and retained austenite or martensite, bainite and retained austenite, and the medium manganese steel layer is in an austenite structure. Due to the large difference of the components between the carbon steel layer and the medium manganese steel layer, new compounds among C, Mn, Cr and Mo are produced at the composite interface in the processes of slab heating, rolling and heat treatment, which is beneficial to improving the strength, hardness and wear resistance of the steel plate and the bonding strength of the carbon steel layer and the medium manganese steel layer.
5. The high-strength wear-resistant composite steel plate fully exerts the advantages of the carbon steel layer and the medium manganese steel layer under the conditions of a proper component system and heating, rolling and heat treatment processes: because the carbon steel layer has ultrahigh obdurability, when the medium manganese steel layer is subjected to impact work hardening, the deformation of the whole steel plate is prevented, the high wear resistance of the medium manganese steel layer can be fully exerted, and the carbon steel layer is very beneficial to practical application.
In a word, the high-strength wear-resistant composite steel plate has obvious advantages, the steel plate obtained by controlling the content of carbon and alloy elements and various heat treatment processes is low in cost, simple in process, high in strength and hardness, good in toughness and high in wear resistance, and is suitable for easily-worn parts of various mechanical equipment.
Detailed Description
The high strength and wear resistant composite steel plate and the manufacturing method thereof according to the present invention will be further explained and illustrated with reference to specific examples, which, however, should not be construed as unduly limiting the technical scope of the present invention.
Examples 1 to 10
Tables 1 to 1 and tables 1 to 2 show the mass percentage ratios of the chemical elements in the carbon steel layers in the high-strength wear-resistant composite steel plates of examples 1 to 10.
TABLE 1-1. (wt%, balance Fe and impurity elements other than S, P, N, H and O)
Tables 1-2 (wt%; balance Fe and impurity elements other than S, P, N, H and O)
Table 2 shows the mass percentages of the chemical elements in the medium manganese steel layer in the high-strength wear-resistant composite steel sheets of examples 1 to 10.
Table 2 (wt%, balance Fe and impurity elements other than S, P)
| C | Si | Mn | P | S | Cr | Mo | Ti | Al | Microstructure of | |
| Example 1 | 0.8 | 0.45 | 10 | 0.013 | 0.003 | 1.25 | 0.55 | 0.011 | 0.033 | Austenite phase |
| Example 2 | 0.85 | 0.35 | 9.5 | 0.01 | 0.008 | 0.65 | 0.41 | 0.008 | 0.031 | Austenite phase |
| Example 3 | 1.1 | 0.45 | 9 | 0.008 | 0.005 | 1.52 | 0.33 | 0.019 | 0.017 | Austenite phase |
| Example 4 | 0.9 | 0.31 | 8.5 | 0.011 | 0.005 | 0.85 | 0.01 | 0.001 | 0.025 | Austenite phase |
| Example 5 | 0.95 | 0.45 | 7.9 | 0.01 | 0.004 | 1.56 | 0.36 | 0.033 | 0.033 | Austenite phase |
| Example 6 | 1 | 0.50 | 7.2 | 0.008 | 0.005 | 0.67 | 0.01 | 0.001 | 0.048 | Austenite phase |
| Example 7 | 1.05 | 0.33 | 6.3 | 0.009 | 0.003 | 1.61 | 0.01 | 0.028 | 0.056 | Austenite phase |
| Example 8 | 1.1 | 0.45 | 6 | 0.01 | 0.003 | 0.56 | 0.01 | 0.001 | 0.041 | Austenite phase |
| Example 9 | 1.35 | 0.28 | 5.5 | 0.009 | 0.003 | 0.01 | 0.25 | 0.011 | 0.033 | Austenite phase |
| Example 10 | 1.5 | 0.44 | 5 | 0.01 | 0.003 | 0.39 | 0.33 | 0.001 | 0.035 | Austenite phase |
The high-strength high-hardness clad steel sheets of examples 1 to 10 were manufactured by the following steps:
(1) smelting according to the table 1-1, the table 1-2 and the table 2 to obtain a carbon steel laminate slab and a medium manganese steel layer slab;
(2) assembling;
(3) heating: heating to 1150-1250 deg.c and maintaining for 1-3 hr;
(4) and (3) composite rolling: the initial rolling temperature is 1120-1220 ℃, the final rolling temperature is 1050-1200 ℃, and the reduction rate is controlled to be more than or equal to 50%;
(5) cooling after rolling;
it is noted that when the step (5) adopts water cooling, the temperature is cooled to room temperature-300 ℃, and the cooling speed is more than or equal to 10 ℃/s; when the step (5) is cooled to room temperature by air cooling, the step (6) is required to be carried out: and (3) off-line quenching, wherein the quenching temperature is 1050-1100 ℃, the heat preservation time is (1.5 x t) min, t represents the thickness of the steel plate, and the unit parameter is mm.
Table 3 shows the specific process parameters of the high-strength wear-resistant composite steel plates of examples 1 to 10 in each step.
Table 3.
Mechanical property tests were conducted on samples of the high-strength wear-resistant composite steel plates of examples 1 to 10, and the test results are shown in tables 4 and 5.
Table 4 shows the mechanical properties of the carbon steel layers of the high strength and wear resistant composite steel sheets of examples 1 to 10.
Table 4.
Table 5 shows the mechanical properties of the medium manganese steel layer of the high-strength wear-resistant composite steel plates of examples 1 to 10.
Table 5.
As can be seen from table 4 and table 5, the high-strength wear-resistant composite steel plate of each example has a carbon steel layer with high strength, high hardness and high toughness, and the carbon steel layer has the following mechanical properties: the tensile strength is more than or equal to 1200MPa, the yield strength is more than or equal to 1000MPa, the elongation is more than or equal to 14 percent, the Brinell hardness is more than or equal to 400HB, and the Charpy V-shaped longitudinal impact energy at minus 40 ℃ is more than or equal to 60J; mechanical properties of the medium manganese steel layer: the hardness is more than or equal to 180HB, the tensile strength is more than or equal to 500MPa, the elongation is more than or equal to 13 percent, and the Charpy U-shaped longitudinal impact energy at minus 40 ℃ is more than or equal to 40J.
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.
Claims (9)
1. A high-strength wear-resistant composite steel plate comprises a substrate layer and a composite layer compounded on the substrate layer on one side or two sides; the composite material is characterized in that the substrate layer is a carbon steel layer, and the composite layer is a medium manganese steel layer;
the carbon steel layer comprises the following chemical elements in percentage by mass: c: 0.10-0.25 wt.%; si: 0.10-1.00 wt.%; mn: 0.40-2.00 wt.%; cr: 0.01-2.00 wt.%; mo: 0.01-1.00 wt.%; ni: 0.01-2.00 wt.%; nb: 0.001-0.080 wt.%; b: 0.0005-0.0040 wt.%; al: 0.010-0.080 wt.%; the balance being Fe and other unavoidable impurities; the tensile strength of the carbon steel layer is more than or equal to 1200MPa, the elongation is more than or equal to 14%, the Brinell hardness is more than or equal to 400HB, and the Charpy V-shaped longitudinal impact energy at minus 40 ℃ is more than or equal to 60J;
the medium manganese steel layer comprises the following chemical elements in percentage by mass: c: 0.80-1.50 wt.%; si: 0.20-1.50 wt.%; mn: 5.00-10.00 wt.%; cr: 0.01-3.00 wt.%; mo: 0.01-1.00 wt.%; ti is less than or equal to 0.060 percent; al: 0.010-0.080 wt.%; the balance of Fe and inevitable impurities; the tensile strength of the medium manganese steel layer is more than or equal to 500MPa, the elongation is more than or equal to 13%, the Brinell hardness is more than or equal to 180HB, and the Charpy U-shaped longitudinal impact energy at-40 ℃ is more than or equal to 50J.
2. A high strength, wear resistant composite steel sheet as claimed in claim 1, wherein the chemical elements of said carbon steel layer further have at least one of 0 < V ≦ 0.080 wt.% and 0 < Ti ≦ 0.060 wt.%.
3. A high strength wear resistant composite steel plate according to claim 2, wherein each chemical element in said carbon steel layer further satisfies at least one of the following formulas:
0.20％≤(Cr/5+Mn/6+50B)≤0.55％；
0.10％≤(Mo/3+Ni/5+2Nb)≤0.42％；
0.02％≤(Al+Ti)≤0.12％。
4. a high strength wear resistant composite steel plate as claimed in claim 1, wherein said carbon steel layer has a microstructure of martensite + retained austenite.
5. A high strength wear resistant composite steel plate as claimed in claim 1, wherein the microstructure of said medium manganese steel layer is austenite.
6. A method of manufacturing a high strength wear resistant clad steel sheet as claimed in any one of claims 1 to 5, comprising the steps of:
(1) preparing a carbon steel laminate slab and a medium manganese steel layer slab;
(2) assembling;
(3) heating: heating to 1150-1250 deg.c and maintaining for 1-3 hr;
(4) and (3) composite rolling: the initial rolling temperature is 1120-1220 ℃, the final rolling temperature is 1050-1200 ℃, and the reduction rate is controlled to be more than or equal to 50%;
(5) and cooling after rolling.
7. The method for manufacturing the high-strength wear-resistant composite steel plate as recited in claim 6, wherein the step (5) is performed by water cooling to room temperature-300 ℃ at a cooling rate of not less than 10 ℃/s.
8. The method for manufacturing a high-strength wear-resistant clad steel plate as recited in claim 6, wherein the step (5) is performed by air-cooling to room temperature, and then the step (6) is performed: and (5) off-line quenching.
9. The method for producing a high-strength wear-resistant composite steel sheet according to claim 8, wherein in the step (6), the quenching temperature is 1050 to 1100 ℃ and the holding time is (1.5 x t) min, where t represents the sheet thickness and the unit parameter is mm.
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| CN113106327B (en) * | 2020-01-13 | 2022-06-24 | 宝山钢铁股份有限公司 | High corrosion-resistant strip steel and manufacturing method thereof |
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