CN110724874A - High-manganese austenitic steel with corrosion and wear resistance and preparation method of hot rolled plate - Google Patents
High-manganese austenitic steel with corrosion and wear resistance and preparation method of hot rolled plate Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
Abstract
The invention discloses a high manganese austenitic steel with corrosion and wear resistance, which comprises the following components in percentage by mass: c: 0.65-0.80%, Si: less than or equal to 0.5 percent, Mn: 9.0-10.0%, P: less than or equal to 0.030 percent; s: less than or equal to 0.020%, Cr: 3.8-6.5%, N: 0.04-0.30%, Ti: 0.15-0.80%, B is less than or equal to 0.0040%, and the balance is iron and inevitable impurities. The invention also discloses a preparation method of the high-manganese austenitic steel hot rolled plate with the corrosion and wear resistance. The invention can solve the problems of poor wear resistance of the existing high manganese steel in a corrosive environment and poor actual wear resistance under the interaction of corrosion and impact, realizes the continuous casting and hot rolling production of the high manganese steel, reduces the production cost, stabilizes the product quality and the like.
Description
Technical Field
The invention relates to wear-resistant steel, in particular to high manganese austenitic steel with corrosion and wear resistance and a manufacturing method of a hot rolled plate thereof.
Background
The austenitic high-manganese wear-resistant steel is invented by Hadfield of England in 1882, and the representative steel grade is Mn 13. The high manganese steel is subjected to deformation induced twin crystal strengthening and dislocation entanglement on a shallow surface under a strong impact load, the surface hardness and strength are rapidly improved, the work hardening phenomenon only exists on the surface, and the material matrix is still austenite, so that the high manganese steel has performance advantages which are not possessed by martensite type wear-resistant steel when being applied to a crusher and shot blasting machine. Along with the development of material science, people have increasingly clear understanding of the existing high manganese steel, and the high manganese steel is found to be not wear-resistant and short in service life in actual use. Climax aluminum corporation in the United states in the 70's of the 20 th century developed medium manganese, (w) (Mn) 6% to 8%, w (Mo) 0.9% to 1.2%) for less severe impact wear conditions, a steel that had already been included in the American ASTM standard and in 1999 in ISO austenitic manganese steel castings.
In recent two years, the novel medium manganese wear-resistant steel BTW1 is released from Bao steel special steel, the service performance is greatly improved by verifying the practical working condition, and the wear resistance index reaches and exceeds the imported product with the same specification. When the surface of the product is extruded, impacted or rubbed by the outside, the metastable austenite structure of the surface layer immediately undergoes phase transformation strengthening, dislocation strengthening and fine grain strengthening, the surface hardness can be rapidly improved from 220HV to more than 550HV, and a material structure state with wear-resistant surface layer and high internal toughness is formed, so that the unique performances of high wear resistance and high toughness are obtained.
However, through research and exploration in these years, special steel companies find that the geological conditions of coal mining are often harsh and variable environments, the fluctuation of the service life of products in different areas is very large, and through field investigation and experimental analysis, the design life of the steel plates in these areas cannot meet the actual requirements mainly because the abrasion-resistant steel plates are influenced by impact and corrosion during coal mining in these areas. Therefore, according to the development trend of the current coal market and the application condition of the wear-resisting plate, a novel wear-resisting steel plate with high wear resistance, corrosion resistance, excellent processing performance and welding performance and high cost performance, which is specially used under a coal mine, is developed to serve as the middle bottom plate, so that the competitiveness of the product in the high-end coal machine market is improved, and the market share is enlarged.
Domestic patent 201310419381.2 (comparative example 1 in table 1) provides an austenite wear-resistant steel with impact wear resistance and a preparation method of a hot rolled plate thereof, wherein the components in percentage by weight are as follows: c: 0.81 to 0.99%, Si: less than or equal to 0.5 percent, Mn: 7.00-9.00%, P: less than or equal to 0.030 percent; s: less than or equal to 0.020%, Cr: 0.5 to 1.49%, Mo: 0.2-0.5%, V: 0.1 to 0.5%, Nb: 0.02-0.15%, B is less than or equal to 0.0040%, and the balance is iron and inevitable impurities. The method mainly solves the technical problems that the existing high manganese steel has poor hardening index under medium and low impact load and poor actual impact wear resistance, realizes the continuous casting and hot rolling production of the high manganese steel, reduces the production cost, stabilizes the product quality and the like.
Domestic patent 200610012329.5 (comparative example 2 in table 1) shows a tungsten-containing wear-resistant austenitic manganese steel, the chemical composition of which is wt%: 1.0-1.5 percent of C, 5.0-15.0 percent of Mn, 0.5-5.0 percent of W, less than 0.8 percent of Si, less than 0.05 percent of S and less than 0.05 percent of P, is used for manufacturing wear-resistant castings such as lining plates, toothed plates, hammers and track plates, but the addition of tungsten in such a high proportion inevitably causes the increase of the production cost.
Domestic patent 96118609.7 (comparative example 3 in table 1) provides an ultra-high manganese alloy wear-resistant steel, and the key point is that after the ultra-high manganese content is added, a metallographic structure is dispersed on an austenitic matrix through reasonable alloy proportion and a heat treatment process, and a large amount of carbon (nitride) is distributed, so that the toughness and the strength are improved.
US4302248A (comparative example 4 in table 1) is a low-carbon high-manganese non-magnetic steel, which is designed with an emphasis on improving the weldability and machinability of the high-manganese non-magnetic steel, and is used as a structural member to replace an expensive austenitic stainless steel structural member, and is not applied to the wear-resistant field.
US4425169A (table 1 for comparative example 5) shows an ultra-high carbon austenitic manganese steel with a carbon content of more than 1.5% with the addition of ferrite-forming elements such as Si, Cr, Al, etc. to obtain a material with a fine grain austenitic structure.
U.S. Pat. No. 4, 4512804A (Table 1 for comparative example 6) shows a typical Hadfield hardened manganese steel, in which the alloying elements are mainly added with Cr, Ni and Mo and micro-alloying treatment of V, Ti elements, and a reasonable heat treatment process is added, so as to improve the strength, ductility and impact toughness of the high manganese steel. And US5601782A is similar to that of US 4512804A.
The design concept of the components of the above patents mainly focuses on the properties of the material, such as strength, toughness, ductility, weldability, machinability, wear resistance and the like, and no deep research is carried out on the influence of the alloy element proportion on the wear resistance of the material in a corrosive environment. In addition, the products referred to in the above patents are mainly applied in the formation of castings, and do not relate to a continuous casting and hot rolling production process.
Disclosure of Invention
The invention aims to solve the defects, provides austenite wear-resistant steel with corrosion and wear resistance and a preparation method of a hot rolled plate, and can solve the problems that the existing high manganese steel has poor wear resistance in a corrosion environment and has poor actual wear resistance under the interaction of corrosion and impact, realize continuous casting and hot rolling production of the high manganese steel, reduce the production cost, stabilize the product quality and the like.
In order to achieve the above object, the present invention adopts the following technical solutions.
In one aspect, a high manganese austenitic steel having resistance to corrosive wear comprises, in mass%: c: 0.65-0.80%, Si: less than or equal to 0.5 percent, Mn: 9.0-10.0%, P: less than or equal to 0.030 percent; s: less than or equal to 0.020%, Cr: 3.8-6.5%, N: 0.04-0.30%, Ti: 0.15-0.80%, B is less than or equal to 0.0040%, and the balance is iron and inevitable impurities.
In another aspect, the method for preparing a hot-rolled sheet of high manganese austenitic steel with resistance to corrosive wear comprises the following steps:
firstly, alloy proportioning is carried out, then electric furnace steelmaking, external refining, continuous casting, hot feeding, reheating, hot rolling, solid solution after rolling are carried out in sequence,
in the reheating step, the heating temperature of the plate blank is controlled to be 1050-1250 ℃;
in the hot rolling step, the initial rolling temperature of the plate blank is controlled to be 1000-1200 ℃, and the final rolling temperature of the plate blank is controlled to be 900-1150 ℃.
In the solid solution step after rolling, controlling the solid solution starting temperature to be 950-1150 ℃; the solid solution termination temperature is controlled to be less than or equal to 500 ℃, and the cooling speed is controlled to be 10-50 ℃/S.
The continuous casting adopts vertical continuous casting.
The high manganese austenitic steel with corrosion and abrasion resistance and the preparation method of the hot rolled plate thereof have the following advantages:
1. compared with the prior art, the invention provides reasonable proportions of C, Mn and Cr elements, controls the stability of austenite and inhibits the precipitation and growth of cementite by alloying treatment of titanium and nitrogen elements, improves the hardening index of high manganese steel under medium and low impact load, and also improves the corrosion resistance of wear-resistant steel. Under the working conditions of medium and low load and medium corrosion, the impact wear performance of the wear-resistant steel is more than 1 time of that of wear-resistant materials such as market wear-resistant steel with the grades of BTW1, Mn13, HARDOX400, HARDOX500 and the like.
2. Through the optimization of alloy elements, the high-temperature strength and the heat conductivity coefficient of the high-manganese steel are improved, and the thermal expansion coefficient of the high-manganese steel is reduced, so that the continuous casting production difficulty and the rolling difficulty are reduced.
3. The invention adopts the vertical continuous casting and hot feeding hot rolling process to realize the production of hot rolled plate products. For high-carbon high-alloy steel, the thermal expansion coefficient is large, the thermal conductivity is low, and the common vertical bending type continuous casting machine cannot produce the high-carbon high-alloy steel. The casting blank produced by the vertical continuous casting machine has greatly improved solidification segregation, uniform structure, greatly improved continuous casting blank inclusion, high purity and greatly improved surface quality. Meanwhile, the rolling is carried out in a reasonable rolling temperature range, and a solution treatment process after rolling is adopted, so that the hot rolled plate product is ensured to have the best tissue state, surface quality and service performance, the production efficiency is improved, and the production cost is reduced.
Drawings
FIG. 1 is a metallographic photograph of an austenitic wear-resistant steel in example 1 of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
The component design idea of the austenitic wear-resistant steel with the corrosion and wear resistance is to improve the corrosion resistance of the austenitic steel, reduce the influence of corrosion on the impact performance of the austenitic steel, control the precipitation type and the morphology of carbides mainly comprising chromium and titanium carbides and optimize the strengthening mechanism of the high manganese steel by alloying treatment. Meanwhile, the vertical continuous casting process is adopted to improve the solidification segregation and surface quality of steel ingots, improve the uniformity of the structure and the purity of molten steel, and the solid solution process after rolling is combined to obtain an austenite + dispersion carbide structure, so that the corrosion and abrasion resistance of manganese steel is improved. The method comprises the following specific steps:
the austenitic wear-resistant steel comprises the following components in percentage by mass: c: 0.65-0.80%, Si: less than or equal to 0.5 percent, Mn: 9.0-10.0%, P: less than or equal to 0.030 percent; s: less than or equal to 0.020%, Cr: 3.8-6.5%, N: 0.04-0.30%, Ti: 0.15-0.80%, B is less than or equal to 0.0040%, and the balance is iron and inevitable impurities.
The effects of the alloy elements are as follows:
carbon: carbon is one of the main elements constituting high manganese steel. Carbon stabilizes the austenite in the alloy and, when rapidly cooled, maintains the austenite in a single phase at room temperature. The solid solution strengthening effect of carbon is enhanced as the carbon content is increased, so that the hardness, strength and wear resistance of the high manganese steel are improved. If the carbon content continues to increase, the amount of carbides in the cast structure of the high manganese steel will increase, most carbides can be dissolved into austenite, but the specific volume of the carbides is different from that of the austenite, so that the high manganese steel after solid solution has a tiny hole defect, the density is further reduced, and the performance of the high manganese steel is influenced to a certain extent. If the high manganese steel is subjected to the water toughening treatment, the amount of carbides remaining in austenite of the high manganese steel is large, and these carbides may be distributed along grain boundaries, which may cause a large reduction in the toughness of the high manganese steel. Generally, the carbon content of high manganese steel is controlled to be 1.0-1.4%, and the C content of BTW1 wear-resistant steel is 0.81-0.99%, but the invention considers the influence of high Cr and Ti alloying on carbide precipitation, so that the C content is reduced, and the C content is designed to be 0.65-0.80%.
Manganese: manganese is a main component of high manganese steel, and has great influence on the expansion of an alloy phase region, the stability of an austenite structure and the reduction of an Ms point, and the manganese can keep the austenite structure of the high manganese steel to room temperature. In addition to being solid-dissolved in austenite, manganese is partially present in (Mn, Fe) C-type carbides in steel. If the content of manganese is increased, the strength and impact toughness of the high manganese steel are improved because manganese has an effect of increasing intercrystalline bonding. If the content of manganese is very high, the thermal conductivity of the steel is reduced, and then a transgranular structure is easy to appear, so that the mechanical and mechanical properties of the high manganese steel are seriously influenced. The determination of the content of manganese is mainly determined by the aspects of workpiece structure, working condition and the like. The manganese content of the workpiece with large section and complex structure should be relatively high. In the invention, the low content of C element is considered, and Mn element is required to be added to ensure the stability of austenite, so that the Mn content control interval is 9.0-10.0%.
Silicon: silicon is usually introduced as a deoxidizer, and has the effects of strengthening solid solution and improving yield strength. But it closes the phase region and promotes graphitization. When the content is more than 0.6 percent, on one hand, the high manganese steel generates coarse grains, and on the other hand, the solubility of carbon in austenite is reduced, so that the precipitation of carbide in grain boundaries is promoted, the wear resistance and the toughness of the steel are reduced, and the hot cracking tendency of the steel is increased. Therefore, we usually control the Si content in the range of 0.3% -0.5%, but in some special cases, if the molten steel has good fluidity, we should increase the Si content to improve the condition of the grain boundary. The silicon content of the invention is controlled below 0.5%.
Sulfur: because of the existence of sulfur and manganese in the high manganese steel, manganese sulfide is generated, and can enter the slag. If the sulfur content is less than 0.02 percent in the production, the standard requirement can be completely met. The sulfur content of the invention is controlled below 0.020%.
Phosphorus: the solubility in austenite is small, and eutectic phosphide is usually generated with iron, manganese and the like, and is precipitated at grain boundaries. Phosphorus and lead to thermal cracking of the material, reducing the mechanical properties of the material and causing some deterioration in wear resistance, and in severe cases even during operation. For example, if a high manganese steel with a phosphorus content of 0.12% is used to manufacture the lining plates of certain cone crushers, the service life of the high manganese steel with a phosphorus content of 0.038% is half of the service life of the high manganese steel. In addition, phosphorus also has the function of promoting the segregation of manganese and carbon elements, and the content of phosphorus should be reduced as much as possible. The phosphorus content of the invention is controlled below 0.030%.
Chromium: chromium is a relatively large element currently used in high manganese steel and also has an obvious effect on corrosion resistance. The invention improves the corrosion resistance mainly by increasing the chromium content. In the production process, most of chromium is dissolved into austenite of the high manganese steel after the water toughening treatment, so that the stability, yield strength and corrosion resistance of the high manganese steel are improved, the elongation and impact toughness of the steel are reduced, the precipitation of carbides during cooling is accelerated, and continuous net distribution is usually carried out on grain boundaries. When reheating is carried out, the austenite is relatively difficult to dissolve, so that single-phase austenite is difficult to obtain, and the temperature for heating the water toughness is increased by 30-50 ℃ on the basis of standard high manganese steel. The addition amount of Cr is 3.8-6.5%.
Titanium: titanium is a strong carbon compound forming element. During hot rolling, the strain induction of carbide delays static and dynamic recrystallization in the thermal deformation process, improves the non-recrystallization temperature, is beneficial to refining the phase change product of deformation austenite, and improves the strength and toughness of steel. However, if the addition amount is too large, niobium carbide is coarsened and grown quickly, and the toughness of the steel is affected. In the invention, the alloying influence is considered, and the Ti content is controlled to be 0.15-0.80%.
Nitrogen: nitrogen significantly improves the stability of austenitic steels, increases the strength and corrosion resistance of the steel, in particular the resistance to localized corrosion, such as intergranular, pitting and crevice corrosion, without significantly impairing the plasticity and toughness of the steel. The boron content in the boron-containing alloy is controlled to be 0.04-0.30.
Boron: trace boron can obviously improve the hardenability of the steel. Boron is adsorbed on austenite crystal boundaries, so that the intercrystalline energy is reduced, ferrite formation is inhibited, and the crystal boundaries are strengthened, thereby improving the creep resistance and the endurance strength of the steel. However, when the content is high, boron is combined with residual nitrogen and oxygen in the steel to form stable inclusions, which deteriorate the properties of the steel. In the patent, the boron content is controlled to be less than or equal to 0.0040 percent.
The preparation method of the hot rolled plate of the austenitic wear-resistant steel comprises the following steps:
firstly, alloy batching is carried out, and then the steps of electric furnace steelmaking, external refining, continuous casting, hot feeding, reheating, hot rolling, solid solution after rolling are carried out in sequence.
In the reheating step, the heating temperature of the plate blank is controlled to be 1050-1250 ℃;
in the hot rolling step, the initial rolling temperature of the plate blank is controlled to be 1000-1200 ℃, and the final rolling temperature of the plate blank is controlled to be 900-1150 ℃.
In the solid solution step after rolling, controlling the solid solution starting temperature to be 950-1150 ℃; the solid solution termination temperature is controlled to be less than or equal to 500 ℃, and the cooling speed is controlled to be 10-50 ℃/S.
In addition, the continuous casting is preferably vertical continuous casting.
The austenitic wear resistant steels of the present invention are compared to the prior art compositions in table 1:
table 1 comparison of the ingredients of the present invention with those of the prior art
Compared with the prior art, the austenitic wear-resistant steel has the following performance requirements:
1. mechanical properties: sigma b is more than or equal to 700MPa, sigma 0.2 is more than or equal to 400MPa, elongation is more than or equal to 20 percent, Brinell hardness is less than or equal to 230
2. Charpy V notch impact performance: the impact energy AKv at room temperature is more than or equal to 80J, and the impact energy AKv at minus 40 ℃ is more than or equal to 30J
3. Impact friction corrosion wear performance: when neutral mine drenches water and middle and low impact load, the volume abrasion rate Wv is less than or equal to 1.25 multiplied by 10-3mm 3/cycle; when acid mine is drenched and medium and low impact load is carried out, the volume abrasion rate Wv is less than or equal to 1.10 multiplied by 10-3mm 3/cycle; when alkaline mine drenches water and middle and low impact load, the volume abrasion rate Wv is less than or equal to 1.20 multiplied by 10-3mm 3/cycle; (the volume wear rate was calculated as Wv. DELTA. m/(rho. N) where Wv is the volume wear rate in mm3/cycle,. DELTA.m is the wear loss in mg; rho is the density in 7.98g/cm 3; and N is the number of impact cycles (cycle))
The main chemical components of examples 1 to 6 of the present invention are shown in Table 2:
table 2 chemical composition (%) -of each example
| Examples | C | Si | Mn | P | S | Cr | Ti | N | B |
| 1 | 0.67 | 0.23 | 9.97 | 0.022 | 0.019 | 5.55 | 0.23 | 0.058 | 0.0032 |
| 2 | 0.75 | 0.24 | 9.95 | 0.028 | 0.010 | 6.12 | 0.18 | 0.114 | 0.0019 |
| 3 | 0.66 | 0.45 | 9.12 | 0.012 | 0.009 | 4.22 | 0.51 | 0.221 | 0.0021 |
| 4 | 0.73 | 0.22 | 9.99 | 0.012 | 0.012 | 3.91 | 0.74 | 0.142 | 0.0025 |
| 5 | 0.78 | 0.31 | 9.12 | 0.025 | 0.013 | 5.47 | 0.32 | 0.271 | 0.0032 |
| 6 | 0.75 | 0.39 | 9.41 | 0.016 | 0.011 | 4.83 | 0.58 | 0.062 | 0.0026 |
The mechanical properties of the above examples are shown in Table 3:
TABLE 3 mechanical Properties of the examples
Impact wear performance of the above examples was compared:
the experimental method and experimental parameters are as follows:
comparative materials: examples 1 to 6, BTW1, HARDOX450, JFE, NM400
Impact work: 2J
Rotating speed: 200 revolutions per minute
Total number of impact cycles: 6000 times
Corrosion medium: the upper and lower samples are immersed in a corrosive medium (a mixture of neutral, acidic and alkaline mine water and 30% of coal gangue particles), and the corrosive medium is stirred by a stirring blade in the whole corrosive wear experimental process, wherein the rotating speed is the same as that of the main shaft.
The volumetric wear rate is calculated as follows:
Wv＝Δm/(ρ·N)
wherein Wv is the volumetric wear rate in mm 3/cycle; Δ m is the abrasion loss in mg; rho is density, and 7.98g/cm3 is taken; n is the number of impact cycles (cycle).
The results are shown in Table 4:
TABLE 4 average wear Rate (. times.10) of different materials-3mm3cycle) comparison results
Comparative examples in table 4: HARDOX450, JFE, BTW1, NM400 are different wear resistant steel grades in the wear resistant steel market, respectively.
The metallographic structure of the hot-rolled plate after solid solution treatment is a uniform austenite + dispersed fine carbide structure, the metallographic structure of the hot-rolled plate in example 1 is magnified by 100 times, the metallographic structure is shown in FIG. 1, no reticular carbide and coarse carbide exist in the metallographic structure, austenite grains are uniform, and the metallographic structure of examples 2-6 is similar to that of example 1.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (4)
1. High manganese austenitic steel with resistance to corrosive wear, characterized in that it comprises, in mass%: c: 0.65-0.80%, Si: less than or equal to 0.5 percent, Mn: 9.0-10.0%, P: less than or equal to 0.030 percent; s: less than or equal to 0.020%, Cr: 3.8-6.5%, N: 0.04-0.30%, Ti: 0.15-0.80%, B is less than or equal to 0.0040%, and the balance is iron and inevitable impurities.
2. Method for the production of a hot-rolled sheet of high manganese austenitic steel with resistance to corrosive wear according to claim 1, characterized in that it comprises the following steps:
firstly, alloy proportioning is carried out, then electric furnace steelmaking, external refining, continuous casting, hot feeding, reheating, hot rolling, solid solution after rolling are carried out in sequence,
in the reheating step, the heating temperature of the plate blank is controlled to be 1050-1250 ℃;
in the hot rolling step, the initial rolling temperature of the plate blank is controlled to be 1000-1200 ℃, and the final rolling temperature of the plate blank is controlled to be 900-1150 ℃.
3. Method for producing a hot-rolled sheet of high manganese austenitic steel with resistance to corrosive wear according to claim 2, characterized in that: in the solid solution step after rolling, controlling the solid solution starting temperature to be 950-1150 ℃; the solid solution termination temperature is controlled to be less than or equal to 500 ℃, and the cooling speed is controlled to be 10-50 ℃/S.
4. Method for producing a hot-rolled sheet of high manganese austenitic steel with resistance to corrosive wear according to claim 2, characterized in that: the continuous casting adopts vertical continuous casting.
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| CN112342352A (en) * | 2020-10-22 | 2021-02-09 | 西安工程大学 | Corrosion-resistant high-manganese austenitic steel plate and preparation method thereof |
| CN112522624A (en) * | 2020-11-30 | 2021-03-19 | 湖南华菱涟源钢铁有限公司 | High manganese austenitic wear-resistant steel and manufacturing method thereof |
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| CN112342352B (en) * | 2020-10-22 | 2022-07-01 | 西安工程大学 | Corrosion-resistant high-manganese austenitic steel plate and preparation method thereof |
| CN112522624A (en) * | 2020-11-30 | 2021-03-19 | 湖南华菱涟源钢铁有限公司 | High manganese austenitic wear-resistant steel and manufacturing method thereof |
| CN112522624B (en) * | 2020-11-30 | 2021-11-16 | 湖南华菱涟源钢铁有限公司 | High manganese austenitic wear-resistant steel and manufacturing method thereof |
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