CN110527906A - 600-grade wear-resistant composite board and production method thereof - Google Patents

Abstract

The invention discloses a 600-grade wear-resistant composite plate and a production method thereof. The composite plate is composed of a base material and a composite material, the base material is low-carbon low-alloy steel; the composite material is 600-grade wear-resistant steel. Vacuum the composite billet and carry out vacuum electron beam sealing welding. The welding process is double gun linkage, and when welding each weld seam, it is divided into N sections, N≥10, and the length of each section is 100-200mm; composite When the billet is heated, the "center heating" method is adopted, so that the composite billet is heated directly from the center and conducted to the surroundings; the composite billet is heated 1 to 2 hours before it is released from the furnace, and the temperature of the flame port on the upper surface of the composite billet at the head and tail is increased by 50-60 °C ; The thickness of the finished composite board is 20-100mm. The shear strength of the composite surface of the composite board is ≥508MPa, the bonding rate is 100%, the Brinell hardness of the composite layer is ≥572, and the impact energy at room temperature is ≥132J. It is used for wear-resistant equipment.

Description

A 600-grade wear-resistant composite plate and its production method

technical field

The invention belongs to the technical field of metal material processing, and in particular relates to a method for producing a 600-grade wear-resistant composite plate using a highly applied vacuum composite + rolling technology.

Background technique

Composite wear-resistant steel plate is a kind of wear-resistant composite material produced by advanced composite manufacturing technology, and it is an advanced wear-resistant composite material in the industrial field. Since the substrate of the wear-resistant composite steel plate is made of ordinary carbon low-alloy steel with good plasticity and toughness, it can absorb energy during the impact process. Therefore, the wear-resistant composite steel plate has stronger impact resistance and crack resistance than simple wear-resistant steel. performance, it can be applied under working conditions with strong vibration and impact. At the same time, the wear-resistant composite steel plate can be made into a standard-sized steel plate, which is light in weight and convenient and flexible in processing. Due to the use of soft substrates, it can be cold-bent inwards, and can be cut by heat sources such as plasma arcs and carbon arcs. In addition, although the price of composite steel plate is higher than that of ordinary steel plate due to material and process reasons, its service life is greatly improved, which greatly reduces the downtime and maintenance time and maintenance costs of equipment used in abrasive environments. According to estimates, the cost performance of composite steel plates is about 2 to 4 times higher than that of ordinary wear-resistant steel plates. The greater the material handling capacity and the more serious equipment wear, the more obvious the economic benefits of using composite steel plates. Therefore, composite wear-resistant steel plates are widely used in various wear-resistant equipment in metallurgical machinery, building materials machinery, electric machinery, mining machinery and other industries.

At present, domestic wear-resistant composite panels are mainly based on surfacing methods, such as wear-resistant electrode surfacing, flux-cored wire surfacing, and plasma surfacing. At the same time, related research and development work has also been carried out on powder method, brazing method and diffusion method. However, these processes have their own limitations. Wear-resistant electrode surfacing welding uses high Cr and high C cast iron electrodes for surfacing welding. Due to the length limitation of cast iron electrodes, it is difficult to realize automatic welding; Influenced by the rate and the dilution of the peripheral iron sheet, it is difficult to increase the content of the strengthening phase, which in turn affects the performance of the wear-resistant plate; the wear-resistant plate prepared by plasma surfacing welding has the characteristics of high hardness and wear resistance, but the surfacing welding efficiency of this process is low, and it is difficult to increase Scale promotion. In this context, scholars have carried out a lot of research and development work on the preparation technology of wear-resistant composite plates.

CN101774288A discloses a "wear-resistant composite plate for metal parts and its repair process", and the document "Research on a Manufacturing Process Method for Wear-resistant Composite Plate" (Xuangui, Cheng Zhiguo, Liu Jianwei, etc., published in "Welding" 2010 No. 8 Issue 37-40 pages) and the literature "Preparation of Wear-resistant Composite Plates by Overlay Welding" (Lu Feng, Wang Yuanzong, Wang Linyan published in "The Fourteenth National Conference on Wear-resistant Materials" 2015, pages 390-394) are used in The wear-resistant composite plate is prepared by surfacing wear-resistant welds on the base steel plate. Its wear resistance is 12 to 18 times higher than that of low carbon steel, 5 times higher than stainless steel and high manganese steel, and higher than cast high chromium iron. 1 times. However, its production efficiency is low and production cost is high, so it is not suitable for industrialized large-scale production.

CN102212821A discloses "a method for preparing a reinforced tungsten carbide wear-resistant composite plate", CN102212822A discloses "a processing method and a processing device for a metal wear-resistant composite plate", and CN102218615A discloses "a method for preparing a thickened wear-resistant layer The above three patents all use the method of spreading relevant powder on the base steel plate to form a wear-resistant composite plate after heat treatment in a heating furnace. The wear-resistant alloy of the working layer is not only smooth , beautiful, and can be directly used in working conditions that require smooth surfaces (such as baffles, etc.). However, the wear-resistant composite plate prepared by this process has poor compactness, low wear resistance and low service life, and cannot meet the actual needs of increasing engineering applications.

CN107557537A discloses "preparation method of high-toughness and high wear-resistance composite board", CN103264259A discloses "a kind of wear-resistant refractory brick mold board and its rapid preparation method", both of the above two patents use heating or adding transition metals to make resistant The wear-resistant composite plate is prepared by forming a metallurgical connection between the grinding plate and the base steel plate, which has high wear resistance and corrosion resistance, high production efficiency, long service life, low cost, energy saving and environmental protection. However, this process relies on pressure-free diffusion or solder connection to prepare wear-resistant composite plates. The shear resistance of the composite interface is low, and defects such as delamination and peeling are prone to occur, which cannot meet the requirements of high-load environments. application, and there is no reliable guarantee for the service life.

To sum up, the current preparation process of wear-resistant composite plates is still dominated by the traditional surfacing method. Although other production processes have gradually carried out related research and development work, there are still many problems and limitations. . At the same time, the commonly used wear-resistant composite panels in the domestic market are 360 to 450 grades. There is less research and development work on wear-resistant composite panels above 450 grades, and there is a lack of a large amount of research data support, which greatly limits the use of wear-resistant composite panels. application.

Faced with the increasing demand for wear-resistant composite panels in the field of engineering applications, especially high-hardness wear-resistant composite panels, an efficient and stable preparation process is urgently needed to produce high-grade wear-resistant composite panels. The rolling method is a new and efficient composite plate preparation process, which generally consists of vacuum forming, heating and rolling processes. However, in the preparation process of high-grade wear-resistant composite plates, due to the difference in physical and chemical properties between wear-resistant steel and base steel, joint failure and plate shape control problems often occur. First of all, due to the high carbon content of wear-resistant steel, welding cracks are prone to occur when the billets are sealed and welded, especially when large-scale composite billets are sealed and welded, the welding deformation and welding stress concentration are obvious, and joint cracking and failure are more likely to occur . Secondly, during the heating process of the composite blank, due to the inconsistent heating deformation of the composite blank, the stress directly acts on the position of the welded joint, and the problem of cracking and failure of the welded joint is also prone to occur. In the process of preparing high wear-resistant composite plates by conventional rolling method, it often occurs that the sealing and welding joints of the composite billet crack and fail after sealing or heating. In addition, in the process of rolling the composite billet, the deformation of the wear-resistant steel and the base steel are often inconsistent, and the problem of warping occurs, and even the rolling cannot be continued due to excessive warping. Based on the above problems, the success rate of producing high-grade wear-resistant steel clad plates by the conventional rolling process is only about 50%.

Contents of the invention

Based on the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide an efficient and stable preparation method of 600-grade wear-resistant composite plate, by optimizing the sealing welding and heating process of the blank assembly, the stress in the sealing welding process of the blank assembly is regulated The distribution state and the temperature field distribution state of the composite billet have achieved obvious control effects, greatly improving the success rate of preparing 600-grade wear-resistant composite panels. Reaching level 600, the success rate of composite panels can reach more than 80%. The plate shape is flat, the composite interface performance is stable, and it has excellent wear resistance.

A 600-grade wear-resistant composite plate, which is composed of low-carbon low-alloy steel and 600-grade wear-resistant steel, wherein the C content in the low-carbon low-alloy steel is C≤0.22% by mass percentage, and the composite material is 600 Grade wear-resistant steel, by mass percentage, the steel contains C: 0.35% ~ 0.40%, Si: 0.4% ~ 0.6%, Mn: 0.40% ~ 1.00%, Cr: 0.8% ~ 1.8%, Mo: 0.2% ~ 0.6%, Nb: 0.01%～0.03%, Ni≤0.60%, Cu≤0.60%, B: 0.0005%～0.0022%, Ti: 0.025%～0.04%, Als: 0.025%～0.045%, P≤0.015%, S≤0.005%, [N]≤0.0080%, [O]≤0.0020%, and Ti/N≥3.4, and the balance is Fe and unavoidable impurities.

The carbon content in the substrate composition is required to be less than 0.22%. On the one hand, the lower carbon content can ensure the quality of the wear-resistant composite billet sealing and welding joints and reduce the crack tendency of the welded joints; In the process of surface-on-line ultra-fast cooling treatment, the base layer can have better impact resistance.

The action mechanism of elements in composite steel is:

C: In order to ensure the ultra-high surface hardness of the steel plate and the hardenability of the thick steel plate when it is water-cooled, a considerable amount of carbon content is required. Within a certain range, the hardness of the steel increases with the increase of the carbon content. At the same time, a certain carbon content can be Form carbide precipitation with Nb, Ti, Cr, Mo, etc. to increase wear resistance. If the carbon content is too high, the plastic toughness will be reduced and the welding performance will be reduced. In order to ensure the high hardness, welding performance and low temperature toughness of the steel plate, the C content is controlled at 0.35% to 0.40% in the present invention;

Si: The main function is solid solution strengthening and deoxidation. It is a non-carbide forming element. When the Si content is high, it will inhibit the precipitation of carbides, but if it is too much, it will reduce the welding performance and affect the toughness. Therefore, the Si content in the present invention is controlled at 0.4 %～0.6%;

Mn: The main function is solid solution strengthening. When the content is greater than 0.4%, it can improve hardenability and increase the supersaturation of carbon in martensite, which is beneficial to the improvement of strength and hardness, and the cost is low, but when the content is higher than 1.0, it is easy to The formation of central segregation will make the slab prone to cracks; therefore, the Mn content in the present invention is controlled at 0.4% to 1.0%;

Nb: It is a strong carbon and nitrogen compound forming element. Its main function is to inhibit the grain growth during heating by forming fine carbonitrides in the steel, and it has a certain precipitation strengthening effect when it is air-cooled; Nb is added to the steel. Tensitic grain interface movement, thereby increasing the recrystallization temperature of the steel plate. When an appropriate amount of Nb is added to the steel plate, the undissolved NbC plays the role of pinning the austenite grain boundary during high-temperature austenitization, thereby hindering the excessive coarsening of the austenite grain boundary. Nb dissolved in austenite inhibits austenite recrystallization and refines austenite grains during two-stage rolling. However, if the Nb content is too high, coarse NbC will be formed, which will affect the mechanical properties of the steel plate. Therefore, the added amount of Nb in the present invention is 0.01%-0.03%.

Ti: It can form compounds with nitrogen, carbon and sulfur. The main function is to inhibit grain growth during heating by forming fine carbonitrides in steel. The formation temperature of titanium and nitrogen compounds is higher, and the precipitation temperature of vanadium carbide and niobium carbide It is lower than titanium carbide and titanium nitride. When adding titanium, by controlling the ratio of titanium and nitrogen (Ti/N≥3.4), niobium is mainly combined with carbon, and at the same time, it can prevent free N and B in the steel from forming compounds and improve acid-soluble boron. Yield fully exerts the effect of B to improve hardenability, but when the content is too high, coarse TiN will be formed, which will reduce the low-temperature toughness and fatigue performance of the steel plate. Therefore, the addition of Ti in the present invention is controlled at 0.025% to 0.04% and Ti /N≥3.4.

Mo, Cr: The main function is to reduce the critical cooling rate, improve the hardenability of the steel plate, and form a completely fine martensitic structure. In addition, chromium and molybdenum can form a variety of carbides in the steel to improve the strength and hardness of the steel plate, ensuring The hardness of the thick gauge steel plate is above 600HB, the Mo content is more than 0.2%, and the effect is obvious when the Cr content is more than 0.8%. Weldability decreases, so the present invention controls Cr: 0.8% to 1.8%, and Mo: 0.2% to 0.6%.

B: Adding a small amount of boron to the steel can greatly improve the quenching hardenability. Since the amount of boron added is very small and has a strong affinity with oxygen and nitrogen in molten steel, it is easy to have a chemical reaction with it, thus losing Improve hardenability. Therefore, before adding boron in smelting, the content of oxygen and nitrogen in molten steel should be reduced as much as possible, but when the B content is too much (≥0.0025%), it is easy to enrich at the grain boundary, which will reduce the binding energy of the grain boundary, and make the steel plate more stable when subjected to impact load. It tends to fracture intergranularly, reducing the low-temperature impact energy absorbed by the steel plate. Therefore, the addition amount of B in the present invention is 0.0005%-0.0022%, and [N]≤0.0080%, [O]≤0.0020%.

Cu, Ni, adding no more than 0.6% copper to the steel plate, the self-tempering process after quenching can form ε-Cu precipitation, which can effectively improve the strength and hardness of the steel, but the Cu-containing steel is easy to Surface quality defects such as edge burning and surface warping are caused by copper brittleness. In order to improve the surface quality of Cu-containing steel, high-melting-point Ni elements are often added to steel to form high-melting-point Cu and Ni binary alloy phases, reduce low-melting-point Cu-rich phases, and increase the solubility of Cu in steel. In order to completely suppress copper brittle defects in Cu-containing steel, the ratio of Ni:Cu is generally controlled to be greater than 1:2. Ni is also an element that improves the hardness and low-temperature toughness of the steel plate at the same time. Ni will form FeNi compounds with Fe. When subjected to low-temperature impact load at low temperature, solid solution Ni will increase the low-temperature impact energy absorption of the steel plate, but the cost of Ni is relatively high, so the addition of 0.6% or less Ni to the medium-thick steel plate of the present invention can ensure the mechanical properties of the steel plate, especially -40℃ low temperature toughness, and make it competitive in the market.

A production method of a 600-grade wear-resistant composite plate. The production process includes material selection, surface treatment, composite blank assembly, vacuum welding, rolling and surface grinding, specifically including:

(1) The base material and composite material are selected as raw materials for billet assembly. The base material is low-carbon low-alloy steel with a C content of C≤0.22% by mass percentage, and the composite material is 600-grade wear-resistant steel.

The base material and composite material can be continuous casting slabs, intermediate slabs, steel plates, etc., and the length and width of the base material and the composite material are the same. Among them, the length is 2-4m, the width is 1-3m, and the thickness ratio of the base material to the composite material 1 to 2, wherein the thickness of the base material is 100 to 150 mm, and the thickness of the composite material is 50 to 100 mm. On the one hand, the ratio of the thickness of the base material to the compound limits the proportion of the composite material in the composite billet, ensuring that both the high wear resistance of the clad layer and the impact resistance of the base layer can be obtained in the subsequent heat treatment process; on the other hand, The total thickness of the composite blank is limited, which not only limits the stress amplitude during the sealing and welding process of the composite blank, but also ensures the deformation consistency of the composite blank during the heating process. Structurally, it reduces the crack sensitivity of the composite blank sealing joint during welding and heating.

(2) Process the surface of the base material and composite material to be in contact, and polish the surface with a planer or milling machine to remove the rust layer and oxide layer on the surface to be in contact.

Use a planer or milling machine to remove the oxide layer on the surface of the base material and composite material to be composited. The processing depth is 5-10 mm, and no cooling liquid is added during the processing. Among them, before the billet is assembled, the surface of the billet to be compounded is ground to remove the rust layer and the oxide layer, so that they are in contact with each other with fresh metal during the rolling process, which is conducive to the formation of a metallurgical bond between the two. , improve the bonding quality, and avoid defects such as inclusions, pores, and unbonding.

(3) Degreasing the surface of the base material and composite material to be compounded.

Use 99.99% high-purity alcohol to degrease the interface between the substrate and the composite material to be composited, and wipe it with a non-woven cloth. Among them, after the machining treatment of the composite surface of the substrate and the composite material is completed, further degreasing treatment with high-purity alcohol and wiping with a non-woven cloth can effectively improve the cleanliness of the composite surface and contribute to the composite interface of the wear-resistant composite board. form a good metallurgical bond.

(4) The base material and composite material are stacked in the center according to the position from top to bottom to form a composite blank.

(5) Vacuum the composite billet after billet assembly, and conduct vacuum electron beam sealing welding, so that the interface between the base material and the composite material to be compounded is in a vacuum environment.

The vacuum degree of the environment where the composite billet is located is ≤4.5×10 ^-2 Pa; Among them, the vacuum electron beam packaging and welding of the composite billet in a vacuum environment can minimize the gas content between the joint surfaces and avoid the occurrence of gas after rolling. The gas remains, causing the binding rate to be inconsistent. In addition, the reduction of the gas content between the bonding surfaces also helps to prevent secondary oxidation on the surface of the bonding surface and contributes to the improvement of the bonding performance. The effective penetration depth of vacuum electron beam sealing welding is 35-40mm, the aspect ratio is 5-6, and the focus position is shifted to the substrate side by 1.5-2.5mm; among them, the electron beam welding process is used for packaging welding, which can Under the condition of low heat input, the welding with large penetration depth is completed, and the obtained welded joint has a large depth-to-width ratio, which reduces the influence of the welding process on the structure and performance of the composite blank. At the same time, no need to use welding consumables and reduce welding energy consumption are conducive to cost control of industrial mass production. Among them, the welding process offset to the base material side can regulate the chemical composition in the weld pool, avoid the martensitic zone of the joint structure, ensure the joint strength, and reduce the crack sensitivity of the joint.

The vacuum electron beam welding sequence is that the two guns are linked together to perform the sealing welding of the two long sides first, and then the sealing welding of the two short sides. And when each weld seam is welded, it is divided into N sections, N≥10, and the length of each section is 100-200mm. The welding sequence is to weld the middle section first and then carry out the remaining sections in the order of left and right. welding. The double-gun linkage process can ensure the consistency of the deformation of the composite billet and reduce the degree of stress concentration; the welding deformation and the welding deformation and The stress is gradually released to reduce the amplitude of welding stress. The crack sensitivity of the wear-resistant composite billet in the process of billet sealing and welding is reduced through a special sealing and welding process.

(6) Heat the combined billet after vacuum treatment to 1200-1250°C for heat preservation, and the heat preservation time is calculated according to the thickness of the composite billet × 1min/mm.

The composite billet is heated by a flame chamber furnace, and the heating adopts the "center heating" method, that is, the heating flame port is located at the upper and lower center positions of the long and wide planes of the composite billet, so that the composite billet is heated directly from the center and conducted to the surroundings. . Among them, the central heating process of the flame chamber furnace can make the composite billet expand and deform from the center, avoiding the inconsistent deformation caused by the surface layer of the composite billet heating and the slow temperature rise of the core, and the stress concentration at the sealing and welding joint. Furthermore, the failure of cracking reduces the crack sensitivity of the composite billet during heating. 1-2 hours before the composite billet is released from the furnace, the temperature of the upper surface of the flame port at the head and tail of the composite billet is increased by 50-60°C. Among them, the heating method on the upper surface of the head and tail can increase the temperature of the base material within a certain range on the upper surface of the head and tail, increase the degree of deformation during the rolling process, effectively avoid the warping problem that is easy to occur in the rolling process of the composite billet, and improve the composite strength. Billet rolling success rate.

(7) Rolling is carried out at 1180-1200°C, the reduction rate in the first pass is 10%-15%, and the total reduction rate is ≥50%.

The composite billet is rolled in the form of base material on the top and 600 wear-resistant steel on the bottom; among them, rolling the 600-grade wear-resistant composite plate in the form of asymmetrical billet assembly can effectively simplify the process complexity of industrialized mass production. The production efficiency is improved, and the release agent coating of the symmetrical billets and the plate splitting after rolling are avoided.

(8) On-line ultra-fast cooling treatment after rolling.

In the step (8), the online ultra-fast cooling is used to water and cool the 600 wear-resistant steel side, so that the cooling rate of the multi-layer is 3-5 °C/s, and after cooling, the temperature is measured on the multi-layer and the temperature returns to red. Less than 300°C. Among them, the online ultra-fast cooling is used to water and cool the composite layer, so that it can obtain a high-hardness martensitic structure and ensure its wear resistance. At the same time, the cooling rate of the base layer side is effectively controlled, so that it can obtain higher impact resistance.

(9) After straightening, edge trimming and surface grinding, the target thickness wear-resistant composite plate is obtained, and the thickness range is 20-100mm.

Beneficial effect:

Compared with the existing products, the wear-resistant composite plate produced by the present invention:

1. The shear strength of the composite interface of the prepared wear-resistant composite board can reach more than 500MPa, the bonding rate is 100%, the Brinell hardness of the wear-resistant layer can reach more than 530, and the impact energy at room temperature can reach more than 118J;

2. Reduce the crack sensitivity of the wear-resistant composite billet in the process of billet sealing, welding and heating, and improve its warping problem in the rolling process, and the production efficiency is increased from about 50% to more than 80%.

Description of drawings

Figure 1 is a schematic diagram of NM600 wear-resistant composite plate.

Detailed ways

The following examples are used to specifically illustrate the contents of the present invention, and these examples are only general descriptions of the contents of the present invention, and do not limit the contents of the present invention.

Table 1 is the actual material of the 600-grade wear-resistant steel of the embodiment of the present invention; Table 2 is the raw material specification of the 600-grade wear-resistant steel of the embodiment of the present invention; Table 3 is the actual material of the low-carbon low-alloy steel of the embodiment of the present invention and Raw material specifications; Table 4 is the relevant information of the composite blank of the embodiment of the present invention; Table 5 is the pre-rolling process and blank information of the embodiment; Table 6 is the rolling system of the embodiment of the present invention; Table 7 is the performance test result of the composite plate of the embodiment .

Table 1 The chemical composition (wt%) of the 600 grade wear-resistant steel of the embodiment

Table 2 The raw material specifications of the 600-grade wear-resistant steel of the embodiment

Example steel type source Length/m Width/m Thickness/mm 1 NM600 Intermediate billet 4 3 80 2 NM600 plate 3.6 2.8 60 3 NM600 Intermediate billet 3.6 2.8 70 4 NM600 Continuous casting slab 4 3 100

Table 3 The actual material and raw material specifications of the low-carbon low-alloy steel of the embodiment

Table 4 Relevant information of the composite billet of the embodiment

Table 5 Example pre-rolling process and billet information

Table 6 Example rolling system

Table 7 Mechanical properties of single-sided composite panels

It can be seen from the examples that according to a 600-grade wear-resistant composite board and its production method of the present invention, the yield strength, tensile strength and elongation of the 600-grade wear-resistant composite board produced all meet the requirements of relevant standards, and the impact at room temperature is ≥ 135. Surface shear strength ≥ 508MPa, Brinell hardness of the composite layer ≥ 572, 100% qualified by ultrasonic inspection, no cracks in the sealing and welding joints during welding and heating, and no head warping in the rolling process of the composite billet.

Claims (3)

1. A 600-grade wear-resistant composite plate, characterized in that it is composed of low-carbon low-alloy steel and 600-grade wear-resistant steel, wherein the C content of the low-carbon low-alloy steel is C≤0.22% by mass percentage ; Grade 600 wear-resistant steel contains C: 0.35% ~ 0.40%, Si: 0.4% ~ 0.6%, Mn: 0.40% ~ 1.00%, Cr: 0.8% ~ 1.8%, Mo: 0.2% ~ 0.6% by mass percentage %, Nb: 0.01%～0.03%, Ni≤0.60%, Cu≤0.60%, B: 0.0005%～0.0022%, Ti: 0.025%～0.04%, Als: 0.025%～0.045%, P≤0.015%, S ≤0.005%, [N]≤0.0080%, [O]≤0.0020%, and Ti/N≥3.4, the balance is Fe and unavoidable impurities; the shear strength of the composite plate composite surface is ≥508MPa, and the bonding rate is 100 %, composite layer Brinell hardness ≥ 572, room temperature impact energy ≥ 132J. 2. The 600-grade wear-resistant composite board according to claim 1, characterized in that the thickness of the finished composite board is 20-100 mm. 3. A production method of a 600-grade wear-resistant composite plate as claimed in claim 1, comprising material selection, surface treatment, composite blank assembly, vacuum welding, rolling and surface grinding, characterized in that, (1) Select base material and composite material as raw materials for billet assembly, the base material is low-carbon low-alloy steel with a C content of C≤0.22% by mass percentage, and the composite material is 600-grade wear-resistant steel; the base material and composite material It can be continuous casting slab, intermediate slab, steel plate, etc., and the length and width of the base material and the composite material are the same, wherein the length is 2-4m, the width is 1-3m, and the thickness ratio of the base material and the composite material is 1-2. The thickness of the base material is 100-150mm, and the thickness of the composite material is 50-100mm; (2) Process the surface of the base material and composite material to be in contact, remove the rust layer and oxide layer on the surface to be in contact, and the processing depth is 5-10mm; (3) Carry out degreasing treatment to the base material and composite surface to be compounded; (4) stack the base material and the composite material in the center according to the position from top to bottom to form a composite blank; (5) Vacuum the composite billet after billet assembly, and carry out vacuum electron beam sealing welding, so that the interface between the base material and the composite material to be composited is in a vacuum environment, and the vacuum degree of the environment where the composite billet is located is ≤4.5×10 ^-2 Pa; The effective penetration depth of beam sealing welding is 35-40mm, the aspect ratio is 5-6, and the focus position is shifted to the base material side by 1.5-2.5mm; the vacuum electron beam welding sequence is double gun linkage, that is, two long The sealing welding of the two short sides is carried out after the sealing welding of the two short sides, and when each welding seam is welded, it is divided into N sections, N≥10, and the length of each section is 100-200mm. The welding sequence is first in the middle The number of segments is welded and then the remaining segments are welded in the order of left and right alternately; (6) Heat the combined billet after vacuum treatment to 1200-1250°C for heat preservation, and the heat preservation time is calculated according to the thickness of the composite billet × 1min/mm; when the composite billet is heated, the "center heating" method is adopted, that is, the heating flame mouth is at the length of the composite billet, The upper and lower center positions of the wide plane make the composite billet heat up in the way of direct heat from the center and conduction to the surroundings; 1-2 hours before the composite billet is released from the furnace, the temperature of the upper surface flame port at the head and tail of the composite billet is increased by 50-60 °C; (7) The composite billet is rolled in the form of the base material on the top and 600 wear-resistant steel on the bottom; the rolling temperature is 1180-1200°C for rolling, the reduction rate of the first pass is 10%-15%, and the total reduction Rate ≥ 50%; (8) After rolling, use online ultra-fast cooling to water and cool the 600 wear-resistant steel side, so that the cooling rate of the double layer is 3-5°C/s, and after cooling, measure the temperature on the double layer and return the red temperature to less than 300 ℃; (9) After straightening, trimming, and surface grinding, the target thickness wear-resistant composite plate is obtained.