CN115537655B - High-silicon wear-resistant steel plate and production method thereof - Google Patents
High-silicon wear-resistant steel plate and production method thereof Download PDFInfo
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- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention discloses a high-silicon wear-resistant steel plate and a production method thereof, wherein the steel plate comprises the following chemical components in percentage by mass: c:0.28 to 0.35 percent, si:2.20 to 2.66 percent, mn:1.40 to 1.60 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.005 percent, cr:0.40 to 0.60 percent, mo:0.25 to 0.45 percent, nb:0.020 to 0.050 percent, al: 0.020-0.050% and the balance of Fe and unavoidable impurities; the production method comprises the procedures of steelmaking, continuous casting, heating rolling and tempering heat treatment. The thickness of the steel plate provided by the invention is 20-50 mm, the yield strength of the whole plate thickness is more than or equal to 1350MPa, the tensile strength is more than or equal to 1500MPa, the transverse V-shaped impact energy at 20 ℃ is more than or equal to 50J, the surface hardness of the steel plate is more than or equal to 450HBW, and the wear resistance is good.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a high-silicon wear-resistant steel plate and a production method thereof.
Background
The wear-resistant steel is widely used in mining machinery, coal mining and transportation, engineering machinery, agricultural machinery, building materials, electric machinery, railway transportation and other departments. Such as steel balls, lining plates, bucket teeth of an excavator, rolling mortar walls, toothed plates, hammer heads of various crushers, track shoes of tractors and tanks, striking plates of fan mills, railway frog, middle trough middle plates, ledge, round link chains for scraper conveyors of coal mines, shovel blades for bulldozers, shovel teeth, lining plates for large electric wheel hoppers, roller bits for perforation of petroleum and open air ores, and the like. Wear is one of the main forms of work piece failure, and causes a significant consumption of energy and raw materials, 1/3 to 1/2 of which is consumed for friction and wear based on incomplete statistics. Grinding media (balls, rods and liners) used in ore and cement mills are steel wear parts that are very costly to use. In the united states, grinding balls are mostly forged or cast from carbon and alloy steels, which account for 97% of the total wear of the grinding balls. In Canada, the steel balls account for 81% of the worn balls. It is counted that China consumes about 80-100 ten thousand t of grinding balls each year, and the annual consumption of the lining plates of the national grinding machine is about 20 ten thousand t, most of which are steel products. The middle groove of the scraper conveyor for the Chinese coal mine consumes 6-8 ten thousand t steel plates each year. In addition, according to incomplete statistics of 5 departments of Chinese electric power, building materials, metallurgy, coal mining, agricultural machinery and the like, the consumption of spare parts per year is more than 150 ten thousand t, and the loss caused by abrasion of a middle groove is 1-2 hundred million Yuan RMB per year by taking a scraper conveyor used in the coal mine as an example. It would be surprising if the economic losses and the consumption of steel caused by the wear of other mechanical equipment were taken into account. Therefore, the quality of the wear-resistant steel is improved, the novel high-performance wear-resistant steel is developed, and the research of steel wear mechanism is widely and deeply carried out to reduce the loss caused by wear, so that the wear-resistant steel is an important work for the development of national economy construction.
Disclosure of Invention
The invention aims to provide a high-silicon wear-resistant steel plate; the invention also provides a production method of the high-silicon wear-resistant steel plate.
In order to solve the technical problems, the invention adopts the following technical scheme:
the high-silicon wear-resistant steel plate comprises the following chemical components in percentage by mass: c:0.28 to 0.35 percent, si:2.20 to 2.66 percent, mn:1.40 to 1.60 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.005 percent, cr:0.40 to 0.60 percent, mo:0.25 to 0.45 percent, nb:0.020 to 0.050 percent, al:0.020 to 0.050 percent, and the balance of Fe and unavoidable impurities.
The thickness of the steel plate is 20-50 mm.
The steel plate has high strength, good toughness and uniform structure, the yield strength of the whole plate thickness is more than or equal to 1350MPa, the tensile strength is more than or equal to 1500MPa, the transverse impact energy at 20 ℃ is more than or equal to 50J, and the surface hardness of the plate thickness is more than or equal to 450HBW.
The invention also provides a production method of the high-silicon wear-resistant steel plate, which comprises the procedures of steelmaking, continuous casting, rolling and tempering heat treatment.
In the steelmaking process, qualified molten steel smelted by a primary smelting furnace is sent to an LF refining furnace for refining, silicon alloy is added after the white slag holding time is more than or equal to 30min in the LF refining process, the total refining time is more than or equal to 60min, after the molten steel refined by the LF furnace is qualified, the molten steel is sent to a VD furnace for vacuum degassing treatment, the high vacuum degree is less than or equal to 66.7Pa, the high vacuum holding time is more than or equal to 20min, soft blowing is carried out for 8-10 min after vacuum damage, and meanwhile calcium treatment is carried out by feeding calcium wires of the molten steel of 1.5-2.0 m/t, so that the spheroidization floating of inclusions is promoted.
In the continuous casting process, a slab is cast by a large slab caster, and the superheat degree of molten steel is controlled between 15 and 25 ℃.
In the heating and rolling process, a casting blank is heated in a continuous furnace, the furnace charging temperature of the casting blank is more than or equal to 300 ℃, the temperature in the heat preservation stage is controlled between 1220 and 1260 ℃, and the total heating time is more than or equal to 300 minutes.
The initial rolling temperature of the heating rolling process is 1050-1100 ℃, the rolling is carried out under large reduction, the reduction rate of each pass is more than or equal to 15% and the final rolling temperature is 850-880 ℃.
The quenching and tempering heat treatment process is carried out at 890-910 ℃ for 1.8-2.0 min/mm, the tempering temperature of the steel plate is 400-430 ℃ for 3.0-3.5 min/mm, and the steel plate is obtained after tempering and air cooling are finished.
The design idea of the invention is as follows:
the invention adopts a chemical composition design mode of high carbon and low alloy, ensures the strength and wear resistance of the steel plate by improving the silicon-carbon content, ensures the purity of molten steel by controlling the vacuum degree and the holding time in the VD process and performing calcium treatment and a reasonable soft blowing process after vacuum in the steelmaking process, casts a large steel ingot in a continuous casting mode, ensures the stability of the internal quality of the steel plate by adopting a large-pressure rolling process in rolling, and finally produces the steel plate with good toughness and wear resistance of 20-50 mm by adopting a proper tempering heat treatment process, thereby being suitable for parts with higher requirements on wear resistance and having wide application prospect.
Wherein, the functions of each chemical component and content in the invention are as follows:
c:0.28 to 0.35 percent, carbon has important influence on various performances of the steel plate, particularly the strength and hardness of the steel plate, the strength of the steel is low due to the excessively low carbon content, the smelting difficulty is increased, and the toughness, the plasticity and the welding performance of the steel are reduced due to the excessively high carbon content.
Si: 2.20-2.66 percent, silicon is a main reducing agent and deoxidizing agent in the steelmaking process, and a certain amount of silicon is contained in the killed steel, so that the silicon can improve the elastic limit, yield strength and tensile strength of the steel, and meanwhile, the wear resistance of the steel plate can be improved.
Mn:1.40 to 1.60 percent, the manganese has low cost, is a good deoxidizer and desulfurizing agent, can increase the toughness, the strength and the hardness of steel, improves the hardenability of the steel, and improves the hot workability of the steel.
P is less than or equal to 0.015%, in general, phosphorus is a harmful element in steel, so that the cold brittleness of the steel is increased, the plasticity is reduced, the welding performance is deteriorated, and the phosphorus content is reduced as much as possible under the condition of reasonable control cost.
S is less than or equal to 0.005%, sulfur is also a harmful element in steel, so that the hot brittleness of the steel is increased, the ductility and toughness of the steel are reduced, but sulfur can increase the free cutting performance of the steel, and unless special requirements are met, the sulfur content in the steel is reduced as much as possible under the economic benefit.
Cr: 0.40-0.60%, chromium is an important element for improving the hardenability of steel, the uniformity of the performance in the thickness direction can be improved, the wear resistance of the steel plate can be improved by adding a certain amount of chromium, but the chromium is too high to form a low-melting Cr-Mn composite oxide with manganese, surface cracks are formed in the hot working process, and the chromium content of the invention is determined according to the condition of multiple tests.
Nb: 0.025-0.050%, niobium can promote grain refinement of a steel plate microstructure, can improve strength and toughness, effectively refine the microstructure by inhibiting austenite recrystallization in the rolling process, improve steel hardenability by precipitation strengthening, reduce overheat sensitivity of steel, and improve welding performance.
Mo:0.25 to 0.45 percent, the strength, the plasticity and the low-temperature impact toughness of the molybdenum are greatly improved, and the molybdenum can enable the C curve of the steel to move right when Mo is dissolved in ferrite and austenite in a solid solution mode, so that the hardenability of the steel is obviously improved; and molybdenum can obviously improve the recrystallization temperature of the steel, and molybdenum can also improve the toughness of the steel.
Al: 0.020-0.050%, aluminum is a deoxidizer commonly used in steel, a small amount of aluminum is added into the steel, so that grains can be refined, impact toughness is improved, oxidation resistance and corrosion resistance are also achieved, and the hot workability, welding performance and cutting workability of the steel are affected by the excessive aluminum content.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in:
1. according to the invention, the strength and the wear resistance of the steel plate are ensured by optimizing the chemical composition design and adopting the silicon content, so that the addition amount of noble metals such as Cr, mo and the like is reduced, and meanwhile, the production cost of the steel plate is reduced without adding noble metal Ni. Through the component design scheme, the addition amount of noble metal is reduced under the condition of ensuring the performance of the steel plate, the production cost is reduced, and the market competitiveness is enhanced.
2. The invention reduces endophytic inclusions generated by molten steel by adopting LF refining, VD vacuum, calcium treatment and soft blowing processes, and improves the purity of the molten steel.
3. The steel plate has good toughness and wear resistance through a reasonable heating rolling process and a quenching and tempering heat treatment process, meets the use requirement of users on high wear resistance, and has wide application prospect.
4. The thickness specification of the steel plate produced by the invention is 20-50 mm, the yield strength of the whole plate thickness of the steel plate is more than or equal to 1350MPa, the tensile strength is more than or equal to 1500MPa, the transverse impact energy at 20 ℃ is more than or equal to 50J, the hardness of the plate thickness surface position is more than or equal to 450HBW, and the wear resistance is good.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The thickness of the high-silicon wear-resistant steel plate is 30mm, and the high-silicon wear-resistant steel plate comprises the following chemical components in percentage by mass: c:0.28%, si:2.51%, mn:1.60%, P:0.012%, S:0.005%, cr:0.60%, mo:0.25%, nb:0.050%, al:0.035%, and the balance of Fe and unavoidable impurities.
The production method of the high-silicon wear-resistant steel plate comprises the procedures of steelmaking, continuous casting, heating rolling and tempering heat treatment, and comprises the following specific process steps:
(1) Steelmaking process: and (3) delivering qualified molten steel smelted by the primary smelting furnace into an LF refining furnace for refining, wherein white slag is kept for 31min in the LF refining process, then adding silicon alloy, and carrying out total refining time of 68min, delivering the molten steel into a VD furnace for vacuum degassing treatment after the molten steel is refined by the LF furnace, carrying out high vacuum degree of 40Pa, carrying out soft blowing for 8min after vacuum breaking, and simultaneously, feeding a calcium wire of 2.0m/t molten steel for calcium treatment, so as to promote spheroidization floating of inclusions.
(2) Continuous casting process: and casting into a plate blank by a large plate blank continuous casting machine, wherein the superheat degree of molten steel is 15 ℃.
(3) And (3) a heating and rolling process: the casting blank is heated in a continuous furnace, the charging temperature of the casting blank is 310 ℃, the temperature in the heat preservation stage is 1230 ℃, and the total heating time is 310min. The initial rolling temperature is 1070 ℃, large reduction rolling is adopted, the reduction rate of each pass is 16% and the final rolling temperature is 880 ℃.
(4) Tempering heat treatment procedure: quenching temperature is 900 ℃, heating time is 1.9min/mm, tempering temperature of the steel plate is 400 ℃, heating time is 3.3min/mm, and the steel plate is obtained after tempering and air cooling are finished.
The whole plate thickness yield strength of the steel plate is 1406MPa, the tensile strength is 1634MPa, the transverse impact energy is 78J at 20 ℃, the plate thickness surface position hardness is 490HBW, and the wear resistance is good.
Example 2
The thickness of the high-silicon wear-resistant steel plate is 35mm, and the high-silicon wear-resistant steel plate comprises the following chemical components in percentage by mass: c:0.35%, si:2.42%, mn:1.52%, P:0.010%, S:0.004%, cr:0.52%, mo:34%, nb:0.34%, al:0.31%, and the balance of Fe and unavoidable impurities.
The production method of the high-silicon wear-resistant steel plate comprises the procedures of steelmaking, continuous casting, heating rolling and tempering heat treatment, and comprises the following specific process steps:
(1) Steelmaking process: and (3) delivering qualified molten steel smelted by the primary smelting furnace into an LF refining furnace for refining, wherein white slag is kept for 30min in the LF refining process, then adding silicon alloy, and carrying out total refining time of 60min, delivering the molten steel into a VD furnace for vacuum degassing treatment after the molten steel is refined by the LF furnace, carrying out high vacuum degree of 55Pa, carrying out soft blowing for 10min after vacuum breaking, and simultaneously, feeding a calcium wire of 1.8m/t molten steel for carrying out calcium treatment, so as to promote spheroidization floating of inclusions.
(2) Continuous casting process: and casting into a plate blank by a large plate blank continuous casting machine, wherein the superheat degree of molten steel is 20 ℃.
(3) And (3) a heating and rolling process: heating the casting blank in a continuous furnace, wherein the charging temperature of the casting blank is 320 ℃, the temperature of the heat preservation stage is 1240 ℃, and the total heating time is 320min. The initial rolling temperature is 1060 ℃, large reduction rolling is adopted, the reduction rate of each pass is 15% and the final rolling temperature is 850 ℃.
(4) Tempering heat treatment procedure: quenching temperature is 900 ℃, heating time is 1.8min/mm, tempering temperature of the steel plate is 410 ℃, heating time is 3.5min/mm, and the steel plate is obtained after tempering and air cooling are finished.
The whole plate thickness yield strength of the steel plate is 1369MPa, the tensile strength is 1596MPa, the transverse impact energy at 20 ℃ is 63J, the plate thickness surface position hardness is 478HBW, and the wear resistance is good.
Example 3
The thickness of the high-silicon wear-resistant steel plate is 20mm, and the high-silicon wear-resistant steel plate comprises the following chemical components in percentage by mass: c:0.32%, si:2.66%, mn:1.42%, P:0.015%, S:0.003%, cr:0.40%, mo:0.29%, nb:0.42%, al:0.020%, and the balance of Fe and unavoidable impurities.
The production method of the high-silicon wear-resistant steel plate comprises the procedures of steelmaking, continuous casting, heating rolling and tempering heat treatment, and comprises the following specific process steps:
(1) Steelmaking process: and (3) delivering qualified molten steel smelted by the primary smelting furnace into an LF refining furnace for refining, wherein in the LF refining process, silicon alloy is added after the white slag is kept for 33min, the total refining time is 65min, after the molten steel is refined by the LF furnace, the molten steel is delivered into a VD furnace for vacuum degassing treatment, the high vacuum degree is 66.7Pa, the holding time is 21min, the molten steel is subjected to soft blowing for 9min after vacuum breaking, and meanwhile, calcium treatment is carried out by feeding a calcium line of 1.6m/t molten steel, so that the spheroidization floating of inclusions is promoted.
(2) Continuous casting process: and casting into a slab by a large slab caster, wherein the superheat degree of molten steel is 25 ℃.
(3) And (3) a heating and rolling process: heating the casting blank in a continuous furnace, wherein the charging temperature of the casting blank is 310 ℃, the temperature in the heat preservation stage is 1250 ℃, and the total heating time is 300min. The initial rolling temperature is 1050 ℃, large reduction rolling is adopted, the reduction rate of each pass is 17% and the final rolling temperature is 870 ℃.
(4) Tempering heat treatment procedure: the quenching temperature is 910 ℃, the heating time is 1.9min/mm, the tempering temperature of the steel plate is 410 ℃, the heating time is 3.0min/mm, and the steel plate is obtained after tempering and air cooling are finished.
The whole plate thickness yield strength of the steel plate is 1350MPa, the tensile strength is 1675MPa, the transverse impact energy is 50J at 20 ℃, the plate thickness surface position hardness is 502HBW, and the wear resistance is good.
Example 4
The thickness of the high-silicon wear-resistant steel plate is 40mm, and the high-silicon wear-resistant steel plate comprises the following chemical components in percentage by mass: c:0.34%, si:2.63%, mn:1.40%, P:0.012%, S:0.002%, cr:0.48%, mo:0.38%, nb:0.38%, al:0.039% and the balance of Fe and unavoidable impurities.
The production method of the high-silicon wear-resistant steel plate comprises the procedures of steelmaking, continuous casting, heating rolling and tempering heat treatment, and comprises the following specific process steps:
(1) Steelmaking process: and (3) delivering qualified molten steel smelted by the primary smelting furnace into an LF refining furnace for refining, wherein white slag is kept for 33min in the LF refining process, then adding silicon alloy, and carrying out total refining time of 60min, delivering the molten steel into a VD furnace for vacuum degassing treatment after the molten steel is refined by the LF furnace, carrying out high vacuum degree of 60Pa, carrying out soft blowing for 9min after vacuum breaking, and simultaneously, feeding a calcium wire of 1.5m/t molten steel for carrying out calcium treatment, so as to promote spheroidization floating of inclusions.
(2) Continuous casting process: and casting into a slab by a large slab caster, wherein the superheat degree of molten steel is 22 ℃.
(3) And (3) a heating and rolling process: heating the casting blank in a continuous furnace, wherein the charging temperature of the casting blank is 300 ℃, the temperature of the heat preservation stage is controlled to be 1260 ℃, and the total heating time is 310min. The initial rolling temperature is 1060 ℃, large reduction rolling is adopted, the reduction rate of each pass is 18% and the final rolling temperature is 860 ℃.
(4) Tempering heat treatment procedure: quenching temperature is 910 ℃, heating time is 2.0min/mm, tempering temperature of the steel plate is 430 ℃, heating time is 3.4min/mm, and the steel plate is obtained after tempering and air cooling are finished.
The whole plate thickness yield strength of the steel plate is 1412MPa, the tensile strength is 1685MPa, the transverse impact energy is 58J at 20 ℃, the plate thickness surface position hardness is 506HBW, and the wear resistance is good.
Example 5
The thickness of the high-silicon wear-resistant steel plate is 50mm, and the high-silicon wear-resistant steel plate comprises the following chemical components in percentage by mass: c:0.29%, si:2.34%, mn:1.55%, P:0.014%, S:0.002%, cr:0.46%, mo:0.42%, nb:0.027%, al:0.042% of Fe and the balance of unavoidable impurities.
The production method of the high-silicon wear-resistant steel plate comprises the procedures of steelmaking, continuous casting, heating rolling and tempering heat treatment, and comprises the following specific process steps:
(1) Steelmaking process: and (3) delivering qualified molten steel smelted by the primary smelting furnace into an LF refining furnace for refining, wherein in the LF refining process, white slag is kept for 31min, then silicon alloy is added, the total refining time is 70min, after the molten steel refined by the LF furnace is qualified, the molten steel is delivered into a VD furnace for vacuum degassing treatment, the high vacuum degree is 40Pa, the holding time is 23min, soft blowing is carried out for 8min after vacuum damage, and meanwhile, calcium treatment is carried out by feeding a calcium wire of 1.7m/t molten steel, so that the spheroidization floating of inclusions is promoted.
(2) Continuous casting process: and casting the steel plate by a large plate blank continuous casting machine, wherein the superheat degree of molten steel is 19 ℃.
(3) And (3) a heating and rolling process: heating the casting blank in a continuous furnace, wherein the charging temperature of the casting blank is 310 ℃, the temperature in the heat preservation stage is 1250 ℃, and the total heating time is 320min. The initial rolling temperature is 1100 ℃, large reduction rolling is adopted, the reduction rate of each pass is 16% and the final rolling temperature is 870 ℃.
(4) Tempering heat treatment procedure: quenching temperature 900 ℃, heating time 1.8min/mm, tempering temperature 420 ℃ and heating time 3.2min/mm, and obtaining the steel plate after tempering and air cooling.
The yield strength of the whole plate thickness of the steel plate is 1392MPa, the tensile strength is 1500MPa, the transverse impact energy at 20 ℃ is more than or equal to 74J, the surface hardness of the plate thickness is 450HBW, and the wear resistance is good.
Example 6
The thickness of the high-silicon wear-resistant steel plate is 25mm, and the high-silicon wear-resistant steel plate comprises the following chemical components in percentage by mass: c:0.30%, si:2.20%, mn:1.48%, P:0.013%, S:0.003%, cr:0.41%, mo:0.41%, nb:0.020%, al:0.050% and the balance of Fe and unavoidable impurities.
The production method of the high-silicon wear-resistant steel plate comprises the procedures of steelmaking, continuous casting, heating rolling and tempering heat treatment, and comprises the following specific process steps:
(1) Steelmaking process: and (3) delivering qualified molten steel smelted by the primary smelting furnace into an LF refining furnace for refining, wherein white slag is kept for 30min in the LF refining process, then adding silicon alloy, and carrying out total refining time of 64min, delivering the molten steel into a VD furnace for vacuum degassing treatment after the molten steel is refined by the LF furnace, carrying out high vacuum degree of 50Pa for 24min, carrying out soft blowing for 10min after vacuum damage, and simultaneously, feeding a calcium wire of 1.9m/t molten steel for carrying out calcium treatment, so as to promote spheroidization floating of inclusions.
(2) Continuous casting process: and casting the steel plate by a large plate blank continuous casting machine, wherein the superheat degree of molten steel is 18 ℃.
(3) And (3) a heating and rolling process: heating the casting blank in a continuous furnace, wherein the charging temperature of the casting blank is 330 ℃, the temperature of the heat preservation stage is 1230 ℃, and the total heating time is 330min. The initial rolling temperature is 1080 ℃, large reduction rolling is adopted, the reduction rate of each pass is 17% and the final rolling temperature is 880 ℃.
(4) Tempering heat treatment procedure: quenching temperature 890 ℃, heating time 1.9min/mm, tempering temperature 430 ℃ and heating time 3.1min/mm, and obtaining the steel plate after tempering and air cooling.
The whole plate thickness yield strength of the steel plate is 1364MPa, the tensile strength is 1547MPa, the transverse impact energy at 20 ℃ is not less than 81J, the plate thickness surface position hardness is 464HBW, and the wear resistance is good.
Example 7
The thickness of the high-silicon abrasion-resistant steel plate produced by the embodiment is 30mm, and the high-silicon abrasion-resistant steel plate comprises the following chemical components in percentage by mass: c:0.34%, si:2.28%, mn:1.54%, P:0.014%, S:0.002%, cr:0.57%, mo:0.45%, nb:0.044%, al:0.048% of Fe and the balance of unavoidable impurities.
The production method of the high-silicon wear-resistant steel plate comprises the procedures of steelmaking, continuous casting, heating rolling and tempering heat treatment, and comprises the following specific process steps:
(1) Steelmaking process: and (3) delivering qualified molten steel smelted by the primary smelting furnace into an LF refining furnace for refining, wherein in the LF refining process, white slag is kept for 35min, then silicon alloy is added, the total refining time is 63min, after the molten steel refined by the LF furnace is qualified, delivering the molten steel into a VD furnace for vacuum degassing treatment, the high vacuum degree is 50Pa, the holding time is 22min, soft blowing is carried out for 9min after vacuum damage, and meanwhile, calcium treatment is carried out by feeding a calcium line of 2.0m/t molten steel, so that the spheroidization floating of inclusions is promoted.
(2) Continuous casting process: and casting into a slab by a large slab caster, wherein the superheat degree of molten steel is 21 ℃.
(3) And (3) a heating and rolling process: heating the casting blank in a continuous furnace, wherein the charging temperature of the casting blank is 320 ℃, the temperature of the heat preservation stage is 1220 ℃, and the total heating time is 310min. The initial rolling temperature is 1090 ℃, large reduction rolling is adopted, the reduction rate of each pass is 15%, and the final rolling temperature is 860 ℃.
(4) Tempering heat treatment procedure: the quenching temperature is 910 ℃, the heating time is 2.0min/mm, the tempering temperature of the steel plate is 420 ℃, the heating time is 3.2min/mm, and the steel plate is obtained after tempering and air cooling are finished.
The whole plate thickness yield strength of the steel plate is 1375MPa, the tensile strength is 1532MPa, the transverse impact power is 93J at 20 ℃, the plate thickness surface position hardness is 460HBW, and the wear resistance is good.
The above embodiments are only for illustrating the technical solution of the present invention, and it should be understood by those skilled in the art that although the present invention has been described in detail with reference to the above embodiments: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention, which is intended to be encompassed by the claims.
Claims (7)
1. The high-silicon wear-resistant steel plate is characterized by comprising the following chemical components in percentage by mass: c:0.28 to 0.35 percent, si:2.20 to 2.66 percent, mn:1.40 to 1.60 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.005 percent, cr:0.40 to 0.60 percent, mo:0.25 to 0.45 percent, nb:0.020 to 0.050 percent, al: 0.020-0.050% and the balance of Fe and unavoidable impurities;
the yield strength of the whole plate thickness of the steel plate is more than or equal to 1350MPa, the tensile strength is more than or equal to 1500MPa, the transverse impact energy at 20 ℃ is more than or equal to 50J, and the surface hardness of the steel plate is more than or equal to 450HBW;
the production method of the steel plate comprises the procedures of steelmaking, continuous casting, heating rolling and tempering heat treatment;
the quenching and tempering heat treatment process comprises the quenching temperature 890-910 ℃, the heating time 1.8-2.0 min/mm, the tempering temperature 400-430 ℃ and the heating time 3.0-3.5 min/mm, and the steel plate is obtained after tempering and air cooling.
2. The high silicon abrasion resistant steel sheet according to claim 1, wherein the steel sheet has a thickness of 20 to 50mm.
3. The high-silicon abrasion-resistant steel plate according to claim 1, wherein the qualified molten steel smelted by the primary smelting furnace in the steelmaking process is sent to the LF refining furnace for refining, and the silicon alloy is added after the white slag is kept for more than or equal to 30min in the LF refining process, and the total refining time is more than or equal to 60min.
4. The high-silicon abrasion-resistant steel plate according to claim 1, wherein after the steel making process and the refining of the LF furnace are finished, the steel is qualified, the steel is sent into a VD furnace for vacuum degassing treatment, the high vacuum degree is less than or equal to 66.7Pa, the high vacuum holding time is more than or equal to 20min, the steel is soft blown for 8-10 min after vacuum damage, and meanwhile calcium wires of 1.5-2.0 m/t of the steel are fed for calcium treatment, so that the spheroidization floating of inclusions is promoted.
5. The high silicon abrasion-resistant steel sheet according to claim 1, wherein the continuous casting process is performed by casting a slab by a large slab caster, and the superheat degree of molten steel is controlled to be 15-25 ℃.
6. The high-silicon wear-resistant steel plate according to claim 1, wherein the heating and rolling process is characterized in that the casting blank is heated in a continuous furnace, the charging temperature is more than or equal to 300 ℃, the temperature in the heat preservation stage is controlled between 1220 and 1260 ℃, and the total heating time is more than or equal to 300min.
7. The high-silicon abrasion-resistant steel sheet according to claim 1, wherein the rolling process is carried out at a rolling start temperature of 1050-1100 ℃ and a rolling under high rolling reduction of the first two passes, each pass rolling reduction of 15% or more and a rolling finish temperature of 850-880 ℃.
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