CN111074169B - Bainite ultrahigh-strength wear-resistant steel plate and production method thereof - Google Patents
Bainite ultrahigh-strength wear-resistant steel plate and production method thereof 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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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- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/18—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
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
Abstract
The invention belongs to the technical field of metallurgy, and particularly provides a bainite super-high-strength wear-resistant steel plate and a production method thereof. The steel plate provided by the invention comprises the following components in percentage by weight: c: 0.46% -0.51%, Si: 1.90% -2.30%, Mn: 1.60-1.90%, P is less than or equal to 0.025%, S is less than or equal to 0.005%, Cr: 1.00% -1.50%, Mo: 0.20-0.50%, Al: 0.015 to 0.045 percent, and the balance of Fe and inevitable impurities; the production process comprises the steps of smelting, continuous casting, heating, rolling, high-temperature tempering and the like. The steel plate provided by the invention has extremely high strength and wear resistance, and the strength of the steel plate can reach more than 2000 MPa; the provided production method has simple procedures, shortens the production period and reduces the production cost.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a bainite super-high-strength wear-resistant steel plate and a production method thereof.
Background
The wear-resistant steel is mainly used for wear-resistant components of mining machinery, engineering machinery and transportation machinery, such as scraper machines, ball mills, lining plates, vibrating screens and the like, and the steel is required to have good wear resistance and is divided into different grades according to specific purposes. The bainite super-high-strength wear-resistant steel plate can replace wear-resistant steel of multiple grades to be used after being processed differently, so that the successful development of the bainite super-high-strength wear-resistant steel is a new breakthrough in the technical field of wear-resistant steel.
Disclosure of Invention
The invention aims to provide a bainite super-high-strength wear-resistant steel plate and a production method thereof, the provided steel plate has extremely high strength and wear resistance, and the strength of the steel plate can reach more than 2000 MPa; the provided production method has simple procedures, shortens the production period and reduces the production cost.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a bainite super-high-strength wear-resistant steel plate comprises the following components in percentage by weight: c: 0.46% -0.51%, Si: 1.90% -2.30%, Mn: 1.60-1.90%, P is less than or equal to 0.025%, S is less than or equal to 0.005%, Cr: 1.00% -1.50%, Mo: 0.20-0.50%, Al: 0.015 to 0.045 percent of the total weight of the alloy, and the balance of Fe and inevitable impurities
The invention also provides a production method of the bainite super-high-strength wear-resistant steel plate, which comprises the following steps:
(1) smelting: smelting molten steel by an electric furnace, then sending the molten steel into an LF refining furnace for refining, transferring the molten steel into a VD furnace for vacuum degassing treatment when the temperature of the molten steel reaches 1645-1655 ℃, adding a CaSi block or a Fe-Ca wire with the diameter of 1cm before VD, wherein the adding amount of the CaSi block is more than or equal to 100 kg/furnace, and the adding amount of the Fe-Ca wire is 100 m/furnace;
(2) continuous casting: casting low-carbon covering slag into a continuous casting crystallizer, pulling out a casting blank, cutting the casting blank, stacking for 7-9 hours, cleaning, and then transferring to a continuous furnace for heating;
(3) heating: the highest heating temperature is 1280 ℃, the soaking temperature is 1100-1260 ℃, the total heating time is 6-8 h, and the soaking time is more than or equal to 3 h;
(4) rolling: heating temperature is 1100-1260 ℃, rolling temperature is 1050-1100 ℃, austenite recrystallization zone is rolled at low speed and high pressure, final rolling is not less than 880 ℃, total reduction rate is not less than 60%, and strip temperature is cut in time after rolling;
(5) tempering: and (3) charging the rolled steel plate into a furnace and tempering, wherein the tempering temperature is 660-700 ℃, the heat preservation time is 4-5 min/mm, and the total in-furnace time is more than or equal to 4 h.
In the production method, the vacuum degree of the vacuum degassing treatment in the step (1) is less than or equal to 66.7MPa, and the vacuum retention time is more than or equal to 20 min.
The production method comprises the following steps: in the step (2), the casting temperature is 1525-1560 ℃.
According to the production method, the thickness of the steel plate ranges from 12mm to 50 mm.
The bainite super-high-strength wear-resistant steel plate provided by the invention is prepared by adding high-content Si, Mn and Cr on the basis of common wear-resistant steel, wherein Mn can play a solid solution strengthening role, and Si and Cr can refine grains and increase the strength of the steel plate. The steel plate provided by the invention has extremely high strength and wear resistance in a hot rolling state, the strength of the steel plate reaches 2000MPa, and the steel plate is domestic wear-resistant steel with the highest strength level.
The steel plate comprises the following components in percentage by weight:
c: the carbon content in the steel determines the matrix hardness of the steel, and for wear-resistant steel, part of carbon in the steel enters the matrix of the steel to cause solid solution strengthening; another portion of the carbon will combine with carbide-forming elements in the alloying elements to form alloyed carbides. For wear-resistant steel, the alloy carbide is required to be dispersed and precipitated on a hot-rolled structure matrix during tempering to generate a double hardening phenomenon, so that the performance of the hot-work die steel is determined by uniformly distributed residual alloy carbide and rolled structure. It follows that the C content in the steel cannot be too low. Therefore, the carbon content of the steel plate with the thickness of the invention is set to be 0.46-0.51%.
Si: silicon is used as a reducing agent and a deoxidizer in the steelmaking process, and simultaneously, the Si can play a role of solid solution strengthening, the silicon can be dissolved in ferrite and austenite to improve the hardness and the strength of the steel, but when the silicon content exceeds 3 percent, the plasticity and the toughness of the steel are obviously reduced. Therefore, the silicon content is set to be 1.90-2.30%.
Mn: the manganese is low in cost, and can increase the toughness, strength and hardness of steel, improve the hardenability of the steel and improve the hot workability of the steel; the manganese content is too high, segregation is easily generated in the center of a large steel ingot, and the carbon content of the eutectoid point of steel is reduced, so that the pearlite content in the structure is increased, and the toughness is unfavorable, so that the control range is set as Mn: 1.60 to 1.90 percent.
Cr: chromium enhances the strength, hardness and wear resistance of the carbon steel in the rolled state without embrittling the steel. After tempering, the alloy has better comprehensive mechanical property and forms chromium-containing carbide, thereby improving the wear resistance of the surface of the material. The steel is not easy to decarbonize during heat treatment, and has good tempering stability. The control range of the chromium content of the steel plate with the thickness of the invention is set to be 1.00-1.50%.
Mo: molybdenum can improve hardenability and heat strength in steel, prevent temper brittleness, and in wear-resistant steel, molybdenum can also keep relatively stable hardness of steel, and increase resistance to deformation cracking, abrasion and the like. The molybdenum content of 0.20-0.50% has wear resistance, tempering hardness, red hardness and the like.
P, S: in general, phosphorus and sulfur are harmful elements in steel, increasing the brittleness of the steel. Phosphorus reduces the welding performance, reduces the plasticity and deteriorates the cold bending performance; sulfur reduces the ductility and toughness of the steel, causing cracks during forging and rolling. Therefore, the contents of phosphorus and sulfur in the steel (P.ltoreq.0.025%, S.ltoreq.0.005%) should be minimized.
Al: the main functions of aluminum in steel are grain refinement and nitrogen fixation, so that the impact toughness of the steel is remarkably improved, and the cold brittleness tendency and the aging tendency are reduced. Therefore, the control range is set to be 0.015% -0.045%.
The invention adopts the continuous casting and refining process, the produced molten steel has low P, S content and pure steel quality; the austenite recrystallization zone controlled rolling process is adopted, and the strengthening effect of alloy elements in steel is fully exerted.
The production method of the bainite ultra-high-strength wear-resistant steel plate provided by the invention has the following advantages:
the invention adopts continuous casting to form the material, the smelting and casting process has lower cost than die casting, and the material can be directly formed without cogging. The rolling process is controlled by adopting an austenite recrystallization region, the rolling is continuous, steel airing in the rolling process is avoided, the rolling time is short, the production rhythm is accelerated, and the rolling yield is improved.
Secondly, the heat treatment only adopts a tempering production process, which is different from the common quenching and tempering processes, thereby not only saving the production cost, but also shortening the production period, realizing rapid delivery, promoting the technical progress of the steel industry, and providing related technical reserve for the production process of the wear-resistant steel.
The steel plate prepared by the production method provided by the invention has the highest domestic strength level of 2000MPa, has good hardness and wear resistance, replaces import, and makes great contribution to the national miners and machinery industry.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
(1) the bainite ultra-high-strength wear-resistant steel plate provided by the invention is strengthened by adopting high silicon, high manganese and high chromium, so that the hardness and the wear resistance of the steel plate are improved; a small amount of Mo and Al are added for composite reinforcement, so that the strength of the steel plate is further improved while the hardness of the steel plate is increased, and the highest strength level in China is reached.
(2) According to the production method provided by the invention, the high-temperature tempering process after hot rolling is adopted to replace the common quenching and tempering after controlled rolling, the obtained steel plate has uniform and refined tissue and good hardness uniformity, and the tempered steel plate eliminates stress and is easy to cut and process.
Detailed Description
The present invention will be further described with reference to the following examples;
example 1
The steel grade of the embodiment is 48Si2Mn2Cr1Mo, the thickness of the steel plate is 12mm, and the steel plate comprises the following components in percentage by weight: c: 0.46%, Si: 1.95%, Mn: 1.80%, P: 0.015%, S: 0.004%, Cr: 1.20%, Mo: 0.50%, Al: 0.025%, and the balance of Fe and inevitable impurities; .
The steel plate production process of the embodiment comprises the following steps:
(1) smelting: smelting molten steel by an electric furnace, feeding the molten steel into an LF refining furnace for refining, transferring the molten steel into a VD furnace for vacuum degassing treatment when the temperature of the molten steel reaches 1650 ℃, and adding CaSi blocks before VD with the addition of 100 kg/furnace; the vacuum degree of the vacuum degassing treatment is 66.5MPa, and the vacuum maintaining time is 25 minutes;
(2) continuous casting: adopting low-carbon covering slag, casting at the temperature of 1525 ℃, cleaning and then transferring to a continuous furnace for heating after casting blanks are stacked for 8 hours;
(3) heating: the highest heating temperature is 1280 ℃, the soaking temperature is 1240 ℃, the total heating time is 6 hours, and the soaking time is 4 hours;
(4) rolling: the heating temperature is 1250 ℃, the initial rolling temperature is 1050 ℃, the austenite recrystallization zone is rolled at low speed and high pressure, the final rolling temperature is 930 ℃, the total reduction rate reaches 90%, and the strip temperature is cut in time after rolling.
(5) Tempering: and (3) charging the rolled steel plate into a furnace for tempering, wherein the tempering temperature is 680 ℃, the heat preservation time is 4min/mm, and the total in-furnace time is 5 h.
The detection shows that the mechanical property results of the finished steel plate with the thickness of 12mm and the thickness of 48Si2Mn2Cr1Mo show that the steel plate has good comprehensive mechanical property, the tensile strength of the steel plate is 2030MPa, and the hardness is 580 HB.
Example 2
The steel grade of the embodiment is 48Si2Mn2Cr1Mo, the thickness of the steel plate is 50mm, and the steel plate comprises the following components in percentage by weight: c: 0.51%, Si: 2.10%, Mn: 1.90%, P: 0.013%, S: 0.003%, Cr: 1.00%, Mo: 0.40%, Al: 0.044%, the balance being Fe and unavoidable impurities;
the steel plate production process of the embodiment comprises the following steps:
(1) smelting: smelting molten steel by an electric furnace, feeding the molten steel into an LF refining furnace for refining, transferring the molten steel into a VD furnace for vacuum degassing treatment when the temperature of the molten steel reaches 1645 ℃, and adding an Fe-Ca wire with the diameter of 1cm before VD, wherein the adding amount is 100 m/furnace; the vacuum degree of the vacuum degassing treatment is 66MPa, and the vacuum maintaining time is 20 minutes;
(2) continuous casting: adopting low-carbon covering slag, casting at 1540 ℃, stacking for 7 hours after casting, cleaning, and then transferring to a continuous furnace for heating;
(3) heating: the highest heating temperature is 1280 ℃, the soaking temperature is 1250 ℃, the total heating time is 8 hours, and the soaking time is 4 hours;
(4) rolling: the heating temperature is 1240 ℃, the initial rolling temperature is 1060 ℃, the austenite recrystallization zone is rolled at low speed and high pressure, the final rolling temperature is 880 ℃, the total reduction rate reaches 80%, and the strip temperature is cut in time after rolling.
(5) Tempering: and (3) charging the rolled steel plate into a furnace for tempering, wherein the tempering temperature is 700 ℃, the heat preservation time is 4.5 min/mm, and the total in-furnace time is 8 h.
The mechanical property results of the finished steel plate of 48Si2Mn2Cr1Mo with the thickness of 50mm show that the steel plate has good comprehensive mechanical properties, the tensile strength of the steel plate is 2100MPa, and the hardness is 590 HB.
Example 3
The steel grade of the embodiment is 48Si2Mn2Cr1Mo, the thickness of the steel plate is 35mm, and the steel plate comprises the following components in percentage by weight: c: 0.48%, Si: 2.25%, Mn: 1.60%, P: 0.020%, S: 0.002%, Cr: 1.50%, Mo: 0.20%, Al: 0.015% and the balance of Fe and inevitable impurities;
the steel plate production process of the embodiment comprises the following steps:
(1) smelting: smelting molten steel by an electric furnace, sending the molten steel into an LF refining furnace for refining, transferring the molten steel into a VD furnace for vacuum degassing treatment when the temperature of the molten steel reaches 1655 ℃, and adding CaSi blocks before VD with the addition amount of 120 kg/furnace; the vacuum degree of the vacuum degassing treatment is 66.2MPa, and the vacuum maintaining time is 22 minutes;
(2) continuous casting: adopting low-carbon covering slag, casting at 1535 ℃, stacking for 8 hours after casting, cleaning, and then transferring to a continuous furnace for heating;
(3) heating: the highest heating temperature is 1280 ℃, the soaking temperature is 1160 ℃, the total heating time is 8 hours, and the soaking time is 5 hours;
(4) rolling: the heating temperature is 1200 ℃, the initial rolling temperature is 1100 ℃, the austenite recrystallization zone is rolled at low speed and high pressure, the final rolling is 950 ℃, the total reduction rate reaches 92%, and the strip temperature is cut in time after rolling.
(5) Tempering: and (3) charging the rolled steel plate into a furnace for tempering, wherein the tempering temperature is 670 ℃, the heat preservation time is 4.5 min/mm, and the total in-furnace time is 7 h.
The detection shows that the mechanical property results of the finished steel plate with the thickness of 35mm and the thickness of 48Si2Mn2Cr1Mo show that the steel plate has good comprehensive mechanical property, the tensile strength of the steel plate is 2090MPa, and the hardness of the steel plate is 620 HB.
Example 4
The steel grade of the embodiment is 48Si2Mn2Cr1Mo, the thickness of the steel plate is 20mm, and the steel plate comprises the following components in percentage by weight: c: 0.50%, Si: 2.30%, Mn: 1.75%, P: 0.012%, S: 0.003%, Cr: 1.30%, Mo: 0.30%, Al: 0.033% and the balance Fe and inevitable impurities; the steel plate production process of the embodiment comprises the following steps:
(1) smelting: smelting molten steel by an electric furnace, sending the molten steel into an LF refining furnace for refining, transferring the molten steel into a VD furnace for vacuum degassing treatment when the temperature of the molten steel reaches 1650 ℃, and adding an Fe-Ca wire with the diameter of 1cm before VD, wherein the adding amount is 100 m/furnace; the vacuum degree of the vacuum degassing treatment is 65.7MPa, and the vacuum maintaining time is 23 minutes;
(2) continuous casting: adopting low-carbon covering slag, casting at 1560 ℃, stacking for 9 hours after casting, cleaning, and then transferring to a continuous furnace for heating;
(3) heating: the highest heating temperature is 1280 ℃, the soaking temperature is 1100 ℃, the total heating time is 7 hours, and the soaking time is 4 hours;
(4) rolling: the heating temperature is 1150 ℃, the initial rolling temperature is 1090 ℃, the austenite recrystallization zone is rolled at low speed and high pressure, the final rolling is 970 ℃, the total reduction rate reaches 95%, and the strip temperature is cut in time after rolling.
(5) Tempering: and (3) charging the rolled steel plate into a furnace for tempering, wherein the tempering temperature is 660 ℃, the heat preservation time is 5min/mm, and the total in-furnace time is 6 h.
The detection shows that the mechanical property results of the finished steel plate with the thickness of 35mm and the thickness of 48Si2Mn2Cr1Mo show that the steel plate has good comprehensive mechanical property, the tensile strength of the steel plate is 2050MPa, and the hardness of the steel plate is 595 HB.
Example 5
The steel grade of the embodiment is 48Si2Mn2Cr1Mo, the thickness of the steel plate is 40mm, and the steel plate comprises the following components in percentage by weight: c: 0.47%, Si: 2.05%, Mn: 1.80%, P: 0.010%, S: 0.002%, Cr: 1.20%, Mo: 0.45%, Al: 0.025%, and the balance of Fe and inevitable impurities;
the steel plate production process of the embodiment comprises the following steps:
(1) smelting: smelting molten steel by an electric furnace, feeding the molten steel into an LF refining furnace for refining, transferring the molten steel into a VD furnace for vacuum degassing treatment when the temperature of the molten steel reaches 1650 ℃, and adding CaSi blocks before VD with the addition of 120 kg/furnace; the vacuum degree of the vacuum degassing treatment is 65MPa, and the vacuum maintaining time is 26 minutes;
(2) continuous casting: adopting low-carbon covering slag, casting at 1550 ℃, stacking for 8 hours after casting, cleaning, and then transferring to a continuous furnace for heating;
(3) heating: the highest heating temperature is 1280 ℃, the soaking temperature is 1240 ℃, the total heating time is 8 hours, and the soaking time is 5 hours;
(4) rolling: the heating temperature is 1230 ℃, the initial rolling temperature is 1060 ℃, the austenite recrystallization zone is rolled at low speed and high pressure, the final rolling is 920 ℃, the total reduction rate reaches 88%, and the strip temperature is cut in time after rolling.
(5) Tempering: and (3) charging the rolled steel plate into a furnace for tempering, wherein the tempering temperature is 690 ℃, the heat preservation time is 4.5 min/mm, and the total in-furnace time is 5.5 h.
The mechanical property results of the finished steel plate with the thickness of 40mm and the thickness of 48Si2Mn2Cr1Mo show that the steel plate has good comprehensive mechanical properties, the tensile strength of the steel plate is 2110MPa, and the hardness of the steel plate is 625 HB.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. A bainite super-high-strength wear-resistant steel plate is characterized in that: the steel plate comprises the following components in percentage by weight: c: 0.46% -0.51%, Si: 1.90% -2.30%, Mn: 1.60-1.90%, P is less than or equal to 0.025%, S is less than or equal to 0.005%, Cr: 1.00% -1.50%, Mo: 0.20-0.50%, Al: 0.015 to 0.045 percent, and the balance of Fe and inevitable impurities; the bainite super-high-strength wear-resistant steel plate is produced by the following method:
(1) smelting: smelting molten steel by an electric furnace, then sending the molten steel into an LF refining furnace for refining, transferring the molten steel into a VD furnace for vacuum degassing treatment when the temperature of the molten steel reaches 1645-1655 ℃, adding a CaSi block or a Fe-Ca wire with the diameter of 1cm before VD, wherein the adding amount of the CaSi block is more than or equal to 100 kg/furnace, and the adding amount of the Fe-Ca wire is 100 m/furnace;
(2) continuous casting: casting low-carbon covering slag into a continuous casting crystallizer, pulling out a casting blank, cutting the casting blank, stacking for 7-9 hours, cleaning, and then transferring to a continuous furnace for heating;
(3) heating: the highest heating temperature is 1280 ℃, the soaking temperature is 1100-1260 ℃, the total heating time is 6-8 h, and the soaking time is more than or equal to 3 h;
(4) rolling: heating temperature is 1100-1260 ℃, rolling temperature is 1050-1100 ℃, austenite recrystallization zone is rolled at low speed and high pressure, final rolling is not less than 880 ℃, total reduction rate is not less than 60%, and strip temperature is cut in time after rolling;
(5) tempering: and (3) charging the rolled steel plate into a furnace and tempering, wherein the tempering temperature is 660-700 ℃, the heat preservation time is 4-5 min/mm, and the total in-furnace time is more than or equal to 4 h.
2. A method for producing a bainite super high strength wear resistant steel plate according to claim 1, wherein: the method comprises the following steps:
(1) smelting: smelting molten steel by an electric furnace, then sending the molten steel into an LF refining furnace for refining, transferring the molten steel into a VD furnace for vacuum degassing treatment when the temperature of the molten steel reaches 1645-1655 ℃, adding a CaSi block or a Fe-Ca wire with the diameter of 1cm before VD, wherein the adding amount of the CaSi block is more than or equal to 100 kg/furnace, and the adding amount of the Fe-Ca wire is 100 m/furnace;
(2) continuous casting: casting low-carbon covering slag into a continuous casting crystallizer, pulling out a casting blank, cutting the casting blank, stacking for 7-9 hours, cleaning, and then transferring to a continuous furnace for heating;
(3) heating: the highest heating temperature is 1280 ℃, the soaking temperature is 1100-1260 ℃, the total heating time is 6-8 h, and the soaking time is more than or equal to 3 h;
(4) rolling: heating temperature is 1100-1260 ℃, rolling temperature is 1050-1100 ℃, austenite recrystallization zone is rolled at low speed and high pressure, final rolling is not less than 880 ℃, total reduction rate is not less than 60%, and strip temperature is cut in time after rolling;
(5) tempering: and (3) charging the rolled steel plate into a furnace and tempering, wherein the tempering temperature is 660-700 ℃, the heat preservation time is 4-5 min/mm, and the total in-furnace time is more than or equal to 4 h.
3. The method for producing the bainite super-high-strength wear-resistant steel plate according to claim 2, wherein the method comprises the following steps: the vacuum degree of the vacuum degassing treatment in the step (1) is less than or equal to 66.7MPa, and the vacuum retention time is more than or equal to 20 min.
4. The method for producing the bainite super-high-strength wear-resistant steel plate according to claim 2, wherein the method comprises the following steps: the casting temperature in the step (2) is 1525-1560 ℃.
5. The method for producing a bainite super high strength wear resistant steel plate according to any one of claims 2 to 4, wherein: the thickness of the steel plate ranges from 12mm to 50 mm.
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| CN111074169B true CN111074169B (en) | 2021-08-24 |
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