CN110438388B

CN110438388B - Preparation method of Australian alternate wear-resistant corrosion-resistant steel

Info

Publication number: CN110438388B
Application number: CN201910724102.0A
Authority: CN
Inventors: 刘鑫; 朱明�; 张弛; 刘文利; 纪建琪; 叶根
Original assignee: Zijing Slurry Pipeline Engineering Co ltd
Current assignee: Zijing Slurry Pipeline Engineering Co ltd
Priority date: 2019-08-07
Filing date: 2019-08-07
Publication date: 2020-11-06
Anticipated expiration: 2039-08-07
Also published as: CN110438388A

Abstract

The invention discloses a preparation method of an austenite-martensite alternating wear-resistant corrosion steel, which mainly adopts a plurality of small amount of weak carbide forming elements, wherein carbon and silicon or aluminum are in a corresponding relation, so that carbide precipitation is avoided to promote the formation of an alternating structure, the steel is heated to an austenitizing region, kept at an isothermal temperature for a period of time, rapidly cooled to a bainite phase transformation region, cooled slowly, and tempered at a low temperature. Forming an austenite-martensite alternating arrangement structure. The main structure of the Austenite alternate wear-resistant steel is a carbon-poor lath martensite and carbon-rich film austenite alternate arrangement structure, and the structure is similar to that of marbled meat. The whole production process is simple, continuous production is convenient to control, and the high-strength high-toughness impact-resistant high-impact crack is obtained optimally. The high impact resistance, cutting resistance and corrosive wear resistance effect are optimal under various environments. The alloy composition and the production process are simple, the control of mass production is convenient, the product quality is good, and the wear resistance is high.

Description

Preparation method of Australian alternate wear-resistant corrosion-resistant steel

Technical Field

The invention relates to the technical field of metal material processing, in particular to a preparation method of an austenite-martensite alternating wear-resistant corrosion-resistant steel.

Background

The metal abrasion-resistant steel is mainly and widely applied to all large-abrasion mechanical equipment such as a material conveying system, a powder making system, a crushing system and the like of enterprises such as thermal power, steel, smelting, machinery, coal, mines, chemical engineering, cement, ports, docks and the like.

Wear mechanism-the wear pattern is mainly divided into: scratch friction is mainly, impact deformation abrasion is mainly, chemical corrosion and electrochemical corrosion occur or the scratch friction and the impact deformation abrasion are simultaneously generated, and factors influencing the quality of the metal wear-resistant product depend on the structure and the mechanical property. At present, metal wear-resistant lining plates and steel balls are basically classified into 3 types: the first kind of high manganese steel has austenite structure casting lining board and steel ball with high plasticity, high impact resistance, weak scratch resistance, high carbon content and low corrosion resistance; the second type mainly comprises martensite or bainite tissues and carbides after quenching of medium-low alloy steel, and has the advantages of high strength, good scratch resistance, unsatisfactory toughness and weak impact resistance; the third kind of wear-resistant cast iron mainly forms carbide with high alloy, and has the advantages of high strength, good scratch resistance, weak impact resistance and high carbon content and poor corrosion resistance.

The field application wear-resistant steel needs strength, toughness and plasticity, the hardness is improved at present, and the field application wear-resistant steel can deal with good cutting treatment. However, the toughness is relatively difficult to improve, and the hardness of upper bainite feather-like cementite precipitation is low, and the toughness is poor. The lower bainite structure has better performance compared with the upper bainite, but the temperature range for obtaining the structure is smaller, the time is long, and the temperature is isothermal. The martensite has low toughness, high strength and relatively large internal stress. Carbide-free bainite needs a salt bath to be obtained isothermally. The Q-P-T process is firstly cooled to below the Ms point and then heated to above the Ms point to create carbon content. The strength steels 3040SI and 300M have high hardenability and strength, and have martensite, bainite, or bainite/bainite complex phase structures, and high strength. However, the toughness reserve is still insufficient for semi-autogenous mill liners which handle large impacts. In the field wear mechanism, various complex wear factors of high impact, high cutting and high corrosion can occur simultaneously, and the wear-resistant steel mainly relying on hardness cannot cope with various complex wear environments.

Disclosure of Invention

In order to overcome the defects, the inventor of the invention summarizes the advantages and disadvantages by long-term research and trial and a plurality of experiments and efforts, and invents a steel grade with one layer of austenite and one layer of martensite alternately arranged. Austenite is used for high impact, martensite is used for cutting, and the high-strength steel is relieved from crack propagation under the action of high-stress impact and corrosion stress for a long time. The preparation method of the austenitic-martensitic alternating wear-resistant corrosion steel is provided on the basis of continuous innovation and innovation in 3040SI and 300M high-hardenability and high-strength steel types and bainite, carbide-free bainite steel, martensite and Q-P-T and combination of chemical components of 300M and 30CrMnSiNi, 40CrMnSiMo, 40CrNi2Si2Mo and 4340 Si.

The invention adopts the following specific technical scheme: the preparation method of the Australian alternate wear-resistant corrosion-resistant steel comprises the following operations:

the method mainly comprises the following steps of selecting alloy, smelting and forming, performing heat treatment and tempering treatment, and specifically comprises the following steps:

1) selecting an element

The alloy comprises the following main alloy elements in percentage by mass: 0.2 to 0.8 weight percent of C, 0.5 to 2.5 weight percent of Si, 0.01 to 2.0 weight percent of Al, 1.6 to 3.6 weight percent of Mn, 0.6 to 2.0 weight percent of Cr, 0.1 to 2.0 weight percent of Ni, 0.1 to 1.0 weight percent of Cu, 0.01 to 0.5 weight percent of Mo, 0 to 0.3 weight percent of P, 0 to 0.03 weight percent of S and the balance of Fe; also comprises one or more auxiliary alloy elements of B0-0.5 wt%, W0-1.0 wt%, Co 0-0.5 wt% and V0-1.0 wt%;

2) smelting and forming

Smelting, rolling, forging and casting molding: smelting the alloy, then adopting casting or forging or rolling process to form, and cooling to room temperature.

3) Heat treatment and cooling, namely heating the formed product to 850 +/-100 ℃, and keeping the temperature for 2 +/-1 hour to room temperature; or heating to 650 +/-100 ℃, keeping the temperature and then cooling to room temperature.

In the specific operation, according to the type of the obtained steel, the smelting process can adopt one of the following modes:

the first method is as follows: the alloy is smelted and austenitized, then is rolled in an on-line control mode, the corresponding deformation and the finish rolling temperature are controlled, a plate or a bar is prepared, then is cooled to the room temperature, is heated to about 900 ℃ and is kept at the room temperature, or is heated to about 650 ℃ and is slowly cooled to the room temperature;

the second method comprises the following steps: smelting the alloy into a casting blank or a steel ingot, then reheating the casting blank or the steel ingot, then carrying out online control forging, controlling corresponding deformation and forging temperature, preparing a plate or a bar, cooling to room temperature, heating to about 900 ℃ and keeping the temperature to room temperature, or reheating to about 650 ℃ and keeping the temperature and then cooling to room temperature;

the third method comprises the following steps: the alloy is melted, austenitized, cast and molded, cooled to room temperature, heated to about 900 ℃ and kept at the room temperature, or heated to about 650 ℃ and kept at the room temperature and then cooled to the room temperature.

4) Thermal treatment (heating and cooling)

Heating the product to an austenite region, preserving heat for 2 +/-1 hours, quickly cooling to 500 +/-100 ℃ after preserving heat, changing a cooling mode, slowly cooling to room temperature below 500 ℃, wherein the cooling speed is less than 75 ℃ per hour, and the optimal time is 1-3 days;

or heating the product to an austenite region, then preserving heat for 2 +/-1 hours, quickly cooling to 500 ℃ after heat preservation, then changing to a slow cooling mode, keeping the isothermal time for 2-100 hours in a 400-plus-100 ℃ region, wherein the isothermal and bainite isothermal points are the transformation time and the carbon content of bainite and martensite, the process keeps the austenite from decomposing, and the fast cooling to the isothermal point is critical and has the inoculation period temperature.

Wherein the medium used in the austenite region rapid cooling process comprises water, quenching liquid, oil cooling, mist cooling, air cooling and air cooling. The slow cooling includes furnace cooling, stack cooling and buried cooling. Landfill cooling and heap cooling include ash burial.

The specific general process is that the casting or the steel product which is rolled and forged off line is made into a required product, the required product of blank recooling or hot forming is also included, and the steel product is heated to austenitizing and heat preserving; after the steel product is in an austenite heat preservation state, the steel product is selected to be rapidly cooled to a bainite region, and the steel product is selected to be at the slowest cooling to the room temperature at the cooling speed.

5) Tempering treatment

And (4) carrying out low-temperature tempering treatment on the product obtained by the heat treatment for 2 +/-1 hours to finish the whole process. The obtained steel product is heated to 300 ℃ and is insulated to room temperature, and the whole process is finished by directly air-cooling or water-cooling to room temperature within a certain temperature insulation time.

The preparation method of the Austrian alternating wear-resistant corrosion-resistant steel provided by the invention has the essential principle that:

1. idea of less addition of multiple alloy elements in alloy

The mode that C-Si-Al-Mn-Cr-Ni-Cu series weak carbide forming elements are mainly added and the alloy variety is more but less is adopted: the strength is improved by adopting medium and low C. Al, Si, P and C are in corresponding relation to control carbide not to be precipitated. Mn increases hardenability, hardenability and depresses the Ms point of the steel. The addition of Cr, Mo, B shifted pearlite to the right. The addition of Cu increases strength and stabilizes residual austenite, prevents hydrogen embrittlement, and improves corrosion resistance. The toughness improvement of Ni enables the austenite and martensite structures to be more stable. Mo increases hardenability to make the austenite and martensite tempers more stable. The addition of W can replace the action of Mo, Ai and Si, the hardenability of B is multiplied, the strength is improved, and the toughness is reduced, and V is a strong carbide element but can increase the amount of retained austenite in steel.

2. Concept of smelting and forming

C-Si-Al-Mn-Cr-Ni-Cu series weak carbide forming elements, a plurality of small-amount modes mainly solve the problem of preventing carbide from being separated out to promote the formation of an austenite-martensite structure, the harmful elements in the left steel are reduced to the minimum, and the later product forming process can be a casting, forging and rolling process and is used for laying a cushion for the later heat treatment.

3. Heat treatment concept

The product is formed and then heated to an austenite region for heat preservation for a certain time, the high-temperature region is cooled quickly, the cooling speed from the austenite region to a bainite region is as high as possible, the cooling speed of the quick cooling is not limited, pearlite and carbide are avoided from being precipitated in a critical way, and a layer of austenite and a layer of martensite are kept unchanged at room temperature. The cooling speed after the bainite area is better, the time is 2-100 hours relatively, as long as the control is good that the carbide is not precipitated, the austenite keeps a film shape and is not decomposed, the slow cooling speed is slower, the structure of a layer of film austenite and a layer of lath martensite is refined, the carbon atoms are distributed to the austenite, and the structure is more stable for a long time. The heat treatment is accompanied by a tempering function.

Because the cross sections of the products are different and the temperatures are correspondingly different, on the premise that the uniform control cannot be realized in the large-scale production, the method has the key points that the rapid cooling from the heat treatment austenite region to the bainite region is realized, and the cooling temperature point and the slow cooling are changed from the bainite region to the room temperature to be regulated and controlled. The method is characterized in that a zone point from bainite to martensite is changed from fast cooling to slow cooling, main key temperature points are determined according to different hardness and toughness of products required, after the cooling speed is changed, the slow cooling is mainly characterized in that a film is narrower, a martensite structure is thinner, a main high-temperature isothermal austenite film with constant temperature to room temperature is wider and more, the high-temperature isothermal strength at 400 ℃ is lower but the toughness is the best, the strength is gradually changed, and the toughness is gradually reduced by the analogy of temperature point reduction and isothermal and the like. The isothermal and slow cooling time is prolonged from short to long, the strength of the Olympic structure and the carbon content process of the Olympic structure are mainly obtained to stabilize the residual Olympic structure, and the mechanical property of the structure proportion of the alternative structure is determined according to the temperature change point. The final purpose of obtaining a stable structure with different mechanical properties of alternately arranged austenite and martensite is achieved.

4. Tempering concept

After low-temperature tempering, the internal stress of the martensite residual austenite structure in the cooling process and the stable structure of the austenite are relieved.

The technology has simple and convenient production components and process, and is convenient for large-scale production and good control of cooling mode.

The proposal optimizes and provides a method which adopts a plurality of small amount of C-Si-Al-Mn-Cr-Ni-Cu series weak carbide forming elements to avoid carbide precipitation and promote formation of an alternate structure. After the steel is heated to an austenitizing region and subjected to isothermal heat preservation for a period of time, the steel is rapidly cooled to a bainite phase transformation region, the slower the bainite region to a martensite region (room temperature), the better the carbide is kept from being separated out, and a layer of austenite and a layer of martensite or a layer of austenite and a layer of bainite/martensite alternating arrangement structure is formed to reach the room temperature. The bainite region is cooled to room temperature at the same time of forming a layer of thin film austenite and a layer of lath martensite alternating structure, and carbon atoms are distributed (diffused) from martensite to austenite, so that the bainite or martensite is not converted any more when carbon-rich austenite is supercooled, and the formed structure is formed by alternately arranging the thin film austenite and the lath martensite or the thin film austenite and the lath bainite and is stabilized to be in service at room temperature. Austenite is responsible for high impact, martensite is responsible for cutting wear, and the alternating arrangement alleviates crack propagation. According to the heat treatment process, because the sections of products are different and the temperatures are correspondingly different, on the premise that the products cannot be uniformly controlled in large-scale production, the point that the cooling temperature point is changed from the austenite region to the bainite region and the point from the bainite region to the room temperature and the slow cooling are regulated and controlled is heat-treated, and the point from the bainite region to the martensite region is changed from the fast cooling to the slow cooling. How to control the temperature change point is the most core, the incubation period is preferably reserved to avoid carbide precipitation, and the temperature of the temperature change point is determined according to different hardness and toughness of the required product. After the cooling speed is changed, the slow cooling or the isothermal cooling to the room temperature is mainly used for obtaining the Otman alternate structure, the carbonization process and the proportion and the stability of the alternate structure. When the cooling speed is changed from austenite to bainite region points, and the mechanical property of the temperature point is changed from quick cooling to slow cooling, the relative strength of the upper bainite point is low, the toughness is relatively optimal, the relative strength of the lower bainite point is middle, the toughness is relatively reduced, the relative strength of the martensite point is high, and the toughness is relatively low. The cooling speed from the point to the room temperature of a bainite area is combined with a mode of tempering from the medium temperature to the high temperature of conventional high-strength steel, different mechanical properties are obtained at different tempering temperatures of the high-strength steel, and the mode is combined with a mode of slowly cooling the bainite area to the room temperature. The faster the high-temperature rapid cooling of the heat treatment is, the better the slow cooling below the medium temperature is, and the internal stress of martensite is relieved by the low-temperature short tempering.

The steel has simple process, is convenient for large-scale production and well-controlled production, can obtain a layer of austenite and a layer of martensite which are mutually alternated, and has the same pattern as marbled meat, and the structure has the best resistance to cracking and cutting of the high-strength steel.

The invention has the beneficial effects that: compared with the prior art, the method has the advantages that,

the high manganese steel adopts the austenite structure to change into the martensite structure after impact to resist abrasion, has the advantages of high impact resistance and difficult cracking, has the defects of easy deformation after impact and weak cutting abrasion resistance.

The alloy steel is basically martensite or bainite structure with carbide and small amount of residual austenite, and has the advantages of high strength and poor toughness. Cast iron uses carbides to resist wear, and has the advantages of high strength and poor toughness. Carbide-free bainite, which is formed at temperatures above bainite, consists of lath ferrite bundles and unconverted austenite, is referred to as carbide-free bainite. The instability of carbide and massive austenite is easy to occur in the high-temperature formation production process of the structure, and the carbide and the massive austenite can be obtained only by the isothermal property of salt bath and the assistance of equipment.

In the Q-P-T carbonization process, carbon atoms are distributed to austenite to stabilize residual austenite, but carbide is easy to appear when the temperature is increased after the temperature is reduced.

The alloy steel adopts different tempering temperatures to determine the final application mechanical property of the steel grade, the high-temperature tempering internal stress is eliminated, but the strength is reduced, and the low-temperature tempering strength and the high internal stress are large.

The invention mainly adopts a mode that elements formed by a plurality of weak carbides and small addition content are mutually restricted, and avoids the occurrence of pearlite and carbide. The heat treatment process adopts the point that austenite enters a bainite area through rapid cooling, and different temperature points are changed for slow cooling, so that the high-temperature section has low hardness and optimal toughness, the low-temperature section has high hardness and relatively low toughness, and the slow cooling or isothermal cooling is adopted to reach room temperature, so that one layer of austenite, one layer of martensite or one layer of austenite, one layer of bainite/martensite structure is kept all the time, the stability of austenite depends on the content of carbon-rich austenite, and the slower the slow cooling speed or the longer the isothermal cooling time, the higher the carbon-rich austenite is, the more stable the austenite is, and the structure is more refined. The present invention has the functions of obtaining the Otman alternate structure, carbon separation, regulating mechanical function and high low temperature tempering internal stress.

Therefore, the invention adopts weak carbides to form various small amount of alloy elements, and adopts the rapid cooling and slow cooling process to summarize all the advantages of bainite, martensite, no carbide, Q-P-T, different mechanical properties obtained by different tempering temperatures, low-temperature tempering strength, high internal stress and the like into rapid cooling and slow cooling. The wear-resistant and corrosion-resistant steel with a layer of austenite and a layer of martensite alternating structure is obtained, the structure is arranged alternately like a quincunx pattern, the high impact resistance is excellent, and the crack propagation is hindered. One layer of austenite is used for high impact abrasion, one layer of martensite is used for cutting abrasion, the mechanical property hardness of the steel is more than HRC40, the V-shaped impact power is more than 50J, the steel is optimal for high impact and cutting in an abrasion mechanism, and meanwhile, the steel shows a good abrasion resistant effect in response to various complex abrasion factors.

Drawings

Fig. 1 is a schematic diagram of the structural evolution of a product forming process.

FIG. 2 is a graph of the temperature profile of the process of the present invention with rapid cooling followed by slow cooling.

FIG. 3 is a graph of the temperature profile of the inventive process followed by rapid cooling and then isothermy.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention, and the corresponding relationship between the fast cooling and the slow cooling and the tempering adopt the low temperature tempering. Thus, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention.

Example 1

The embodiment is mainly suitable for large-section and complex-shape large-impact wear-resistant parts, lining plates, steel balls and the like to prepare the Australian alternate complex-phase wear-resistant corrosion-resistant steel.

Wherein the main alloy elements are as follows: 0.2 wt% of C, 1.8 wt% of Mn, 1.4 wt% of Si, 1.0 wt% of Cr, 0.2 wt% of Mo0.2 wt% of Ni, 0.5 wt% of Cu and the balance of Fe.

The alloy elements are formed by forging or rolling or casting technology, then cooled to room temperature, heated to 900 ℃, kept warm for 2 hours, air-cooled to room temperature, heated to about 650 ℃, kept warm and then cooled to room temperature.

Then heating to 850 deg.C, keeping the temperature, cooling with quenching liquid at the cooling speed of more than 5 deg.C per minute, and cooling in furnace at the cooling speed of less than 50 deg.C per hour to room temperature.

And (3) tempering process: heating to 250 deg.C, keeping the temperature for 2 hr, and air cooling to room temperature.

Obtaining a tissue: one layer of austenite and one layer of martensite/bainite alternately arranged structure.

The mechanical properties of the product are as follows: the thickness of the workpiece is 10-100 mm; the hardness HRC30-40, and the V-shaped impact energy is more than 100J.

Example 2

The embodiment is suitable for large-section and complex-shape large-impact wear-resistant parts, lining plates, steel balls and the like, and prepares the Australian alternate complex-phase wear-resistant corrosion-resistant steel, which comprises the following specific steps:

wherein the main alloy elements are as follows: 0.3 wt% of C, 2.5 wt% of Mn, 1 wt% of Si, 0.5 wt% of Al0, 1.5 wt% of Cr; 0.4 wt% of Mo, 0.5 wt% of Ni, 0.5 wt% of Cu, 0.03wt% of an additional element V0.03wt% and the balance Fe.

Quenching process:

after forging or rolling or casting process forming, cooling to 650 deg.C, keeping the temperature, and cooling to room temperature.

Heating to 900 deg.C, maintaining the temperature, cooling to 350 deg.C with hot oil at a cooling rate of 20 deg.C/min, cooling to 350 deg.C, keeping the temperature at 350 deg.C for 4 hr, and air cooling to room temperature.

And (3) tempering process: after heating to 300 ℃ and keeping the temperature for 2 hours, cooling to room temperature by water.

Obtaining a tissue: one layer of martensite and one layer of austenite are alternately arranged.

The mechanical properties of the product are as follows: the hardness HRC30-50, the V-shaped impact energy is more than 50J, and the thickness is 100-300 mm.

Example 3

wherein the main alloy elements are as follows: 0.3 wt% of C, 2.5 wt% of Mn, 1.8 wt% of Si and 1.5 wt% of Cr; 0.4 wt% of Mo0.4wt%, 1.5 wt% of Ni, 0.5 wt% of Cu, 0.03wt% of additional element V0.03wt% and the balance of Fe.

Quenching process:

Heating to 900 deg.C, keeping the temperature, cooling with air at a speed of 20-450 deg.C per minute, cooling with ash at 450 deg.C, and cooling to room temperature after 2 days.

And (3) tempering process: heating to 200 deg.C, keeping the temperature for 1 hr, and air cooling to room temperature.

The mechanical properties of the product are as follows: the hardness HRC40-50, the V-shaped impact energy is more than 50J, and the thickness is 100-300 mm.

Example 4

The embodiment is suitable for large-section and complex-shape large-impact wear-resistant parts, lining plates, steel balls and the like, and the mao alternating complex-phase wear-resistant corrosion-resistant steel is prepared by the following steps:

wherein the main alloy elements are as follows: 0.6 wt% of C, 3.5 wt% of Mn, 2 wt% of Si, 1 wt% of Al, 1.0 wt% of Cr, 0.2 wt% of Mo0.2 wt% of Ni, 0.3 wt% of Cu, 0.003wt% of an auxiliary alloying element B0.03wt% of Co0.03wt% and the balance Fe.

Quenching process:

after forging or rolling or casting process forming, cooling to room temperature, heating to about 900 deg.C, keeping the temperature for 1 hr, air cooling to room temperature, heating to about 650 deg.C, keeping the temperature, and cooling to room temperature.

Heating to 950 deg.C, maintaining the temperature, cooling with water mist to below 450 deg.C at cooling rate of 10 deg.C/min, cooling with ash at cooling rate of 5 deg.C/h for 2 days, and cooling to room temperature.

And (3) tempering process: heating to 250 deg.C, keeping the temperature, and air cooling to room temperature.

The mechanical properties of the product are as follows: the hardness HRC50-60, the V-shaped impact energy is more than 50J, and the thickness is 100-500 mm.

Example 5

The preparation method of the martensite alternating multiphase wear-resistant corrosion-resistant steel comprises the following specific steps:

1. wherein the main alloy elements are as follows: 0.8 wt% of C, 2.0 wt% of Mn, 1.5 wt% of Si and 1.5 wt% of Al; ni0.5wt%, auxiliary alloy element B0.005wt%, and the balance Fe.

2. After the alloy is smelted, the on-line hot feeding is carried out to control the rolling ratio or the forging ratio to prepare a required product, then the product is cooled to room temperature by stacking, then the temperature is raised to 660 ℃, the temperature is kept for 8 hours, then the product is cooled to room temperature,

3. the steel product is processed; heating from room temperature to complete austenitizing, keeping the temperature for 1.5 hours, directly cooling from an austenite state to 300 ℃ by using air speed, and cooling to room temperature by using ash heap cooling for 90 hours;

4. and (3) heating the mixture to 150 ℃, preserving the heat for 2 hours, and directly cooling the mixture to room temperature by water to complete the process.

The mechanical properties of the product are as follows: the hardness HRC65, the V-shaped impact energy 20J and the structural form is an alternating structure of martensite and austenite.

Example 6

1. wherein the main alloy elements are as follows: 0.5 wt% of C, 2.5 wt% of Mn, 1.5 wt% of Si, 1.5 wt% of Al, 2.0 wt% of Cr2, 0.3 wt% of Cu, and the balance of Fe.

2. After the alloy is smelted, the on-line control of the forging ratio and the thickness of a forged piece are carried out, then the alloy is cooled to 650 ℃ for 8 hours and then is slowly cooled to room temperature,

3. cold working the off-line rolled product by mechanical equipment to obtain required products such as balls and lining plates, 4, heating the cold-formed steel product to complete austenitizing, and keeping the temperature for 2 hours;

5. directly cooling the steel product from an austenite state to 380 ℃ by using a water quenching liquid, and embedding and cooling for 72 hours to room temperature;

6. heating the mixture to 100 ℃, preserving the heat for 2 hours, and then directly cooling the mixture to room temperature by air to complete the process; the structure form is obtained as an alternating structure of martensite and austenite.

The mechanical properties of the product are as follows: hardness HRC50, type V impact energy 50J.

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.

Claims

1. The preparation method of the Australian alternate wear-resistant corrosion-resistant steel is characterized by comprising the following operations:

1) the alloy elements are as follows by mass percent: 0.2 to 0.8 weight percent of C, 0.5 to 2.5 weight percent of Si, 0.01 to 2.0 weight percent of Al, 1.6 to 3.6 weight percent of Mn, 0.6 to 2.0 weight percent of Cr, 0.1 to 2.0 weight percent of Ni, 0.1 to 1.0 weight percent of Cu, 0.01 to 0.5 weight percent of Mo, 0 to 0.3 weight percent of P, 0 to 0.03 weight percent of S and the balance of Fe; also comprises one or more auxiliary alloy elements of B0-0.5 wt%, W0-1.0 wt%, Co 0-0.5 wt% and V0-1.0 wt%;

2) smelting, rolling, forging and casting: smelting the alloy in the step 1), then adopting a casting or forging or rolling process to form, and cooling to room temperature;

3) heat treatment and cooling, namely heating the formed product in the step 2) to 850 +/-100 ℃, and keeping the temperature for 2 +/-1 hour to room temperature; or heating to 650 +/-100 ℃, preserving the temperature and then cooling to room temperature;

4) heating the product in the step 3) to an austenite region, preserving heat for 2 +/-1 hours, quickly cooling to 500 +/-100 ℃ after preserving heat, changing a cooling mode, slowly cooling to room temperature below 500 ℃, wherein the cooling speed is less than 75 ℃ per hour, and the time is 1-3 days; or heating the product in the step 3) to an austenite region, then preserving heat for 2 +/-1 hours, quickly cooling to 500 ℃ after heat preservation, then changing to a slow cooling mode, reserving incubation period temperature in the middle, and keeping isothermal time in a 400-plus-100 ℃ region for 2-100 hours to room temperature;

5) and (3) carrying out low-temperature tempering treatment on the product in the step 4), wherein the treatment time is 2 +/-1 hour, and finishing the whole process.

2. The method for preparing the omasum alternating wear-resistant steel according to claim 1, wherein the finally formed omasum alternating wear-resistant steel product is a wear-resistant steel piece.

3. The method for preparing the omasa alternating abrasion resistant steel according to claim 2, wherein the abrasion resistant steel piece is an abrasion resistant plate, an abrasion resistant ball or an abrasion resistant pipe.

4. The method for preparing the omasa alternating wear-resistant corrosion-resistant steel according to claim 1, wherein the main structure obtained by the low-temperature tempering is a structure in which a layer of austenite and a layer of martensite are alternately arranged.