CN115537655A - 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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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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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- 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
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- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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%, si:2.20 to 2.66%, mn: 1.40-1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, cr:0.40 to 0.60%, mo:0.25 to 0.45%, nb:0.020 to 0.050%, al: 0.020-0.050%, and the balance of Fe and inevitable impurities; the production method comprises the working procedures of steel making, continuous casting, heating rolling and quenching 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 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 applied to mining machinery, coal mining and transportation, engineering machinery, agricultural machinery, building materials, electric machinery, railway transportation and other departments. Such as steel balls and lining plates of ball mills, bucket teeth and buckets of excavators, rolling mortar walls, toothed plates and hammers of various crushers, track plates of tractors and tanks, striking plates of fan mills, railway frog, middle trough plates, ledges and round chains of coal mine scraper conveyors, shoveling blades and shoveling teeth of bulldozers, lining plates of large electric wheelers, roller bits for petroleum and opencast iron perforation, and the like. Wear is one of the main forms of failure of a workpiece, and wear causes a large consumption of energy and raw materials, and 1/3 to 1/2 of the energy is consumed for friction and wear according to incomplete statistics. The grinding media (balls, rods and liners) used in ore and cement mills are very costly wear parts of steel. In the united states, grinding balls are mostly forged or cast from carbon and alloy steels, which account for 97% of the total grinding ball consumption. In canada, 81% of the balls are consumed. According to statistics, the grinding balls are consumed by China at 80-100 million t each year, the annual consumption of the lining plates of the national mills is nearly 20 million t, and most of the grinding balls are steel products. 6-8 million steel plates are consumed in the middle groove of the scraper conveyor for the Chinese coal mine every year. According to the incomplete statistics of 5 departments of Chinese electric power, building materials, metallurgy, coal mining, agricultural machinery and the like, the steel consumption of spare parts per year is more than 150 kilo tons, and taking a scraper conveyor used in a coal mine as an example, the loss caused by the abrasion of a middle groove is 1 to 2 million yuan RMB each year. It is surprising to consider the economic losses and steel consumption due to wear of other mechanical equipment. Therefore, the method improves the quality of the wear-resistant steel, develops novel high-performance wear-resistant steel, and extensively and deeply develops the research on the wear mechanism of steel so as to reduce the loss caused by wear, and is a significant work for the development of national economic construction.
Disclosure of Invention
The technical problem to be solved by the invention is 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 technical scheme adopted by the invention is as follows:
the high-silicon wear-resistant steel plate comprises the following chemical components in percentage by mass: c:0.28 to 0.35%, si:2.20 to 2.66%, mn: 1.40-1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, cr:0.40 to 0.60%, mo:0.25 to 0.45%, nb:0.020 to 0.050%, al: 0.020-0.050%, and the balance of Fe and inevitable 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 is more than or equal to 1350MPa, the tensile strength is more than or equal to 1500MPa, the transverse impact power at 20 ℃ is more than or equal to 50J, and the surface hardness of the plate 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 working procedures of steelmaking, continuous casting, rolling and quenching and tempering heat treatment.
In the steelmaking process, the qualified molten steel smelted by the primary smelting furnace is sent into an LF refining furnace for refining, in the LF refining process, silicon alloy is added after the white slag retention time is more than or equal to 30min, the total refining time is more than or equal to 60min, after the molten steel is qualified after the LF refining is finished, the molten steel is sent into a VD furnace for vacuum degassing treatment, the high vacuum degree is required to be less than or equal to 66.7Pa, the high vacuum retention time is more than or equal to 20min, soft blowing is carried out for 8-10 min after vacuum destruction, and meanwhile, calcium wires of 1.5-2.0 m/t of molten steel are fed for calcium treatment, so that spheroidization and floating of inclusions are promoted.
In the continuous casting process, a large slab caster is used for casting the slab, and the superheat degree of molten steel is controlled between 15 and 25 ℃.
According to the heating rolling process, a casting blank is heated in a continuous furnace, the charging temperature of the casting blank is more than or equal to 300 ℃, the temperature of a heat preservation stage is controlled to be 1220-1260 ℃, and the total heating time is more than or equal to 300min.
In the heating rolling process, the initial rolling temperature is 1050-1100 ℃, the rolling is carried out under high reduction, the reduction rate of each pass is more than or equal to 15 percent in the first two passes, and the final rolling temperature is 850-880 ℃.
In the quenching and tempering heat treatment process, the quenching temperature is 890-910 ℃, the heating time is 1.8-2.0 min/mm, the tempering temperature of the steel plate is 400-430 ℃, the heating time is 3.0-3.5 min/mm, and the steel plate is obtained after air cooling after tempering.
The design idea of the invention is as follows:
the invention adopts a high-carbon low-alloy chemical component design mode, ensures the strength and the wear resistance of the steel plate by improving the content of silicon and carbon, ensures the purity of molten steel by controlling refining in the steelmaking process, controlling the vacuum degree and the holding time in the VD process, performing calcium treatment and reasonable soft blowing process after vacuum, casts the molten steel into a large steel ingot by a continuous casting mode, ensures the stability of the internal quality of the steel plate by adopting a high-pressure rolling process during rolling, and finally produces the steel plate with good obdurability and wear resistance of 20-50 mm by adding a proper quenching and tempering heat treatment process.
Wherein, the chemical components and the contents thereof have the following functions in the invention:
c:0.28 to 0.35 percent, carbon has important influence on various properties of the steel plate, particularly the strength and the hardness of the steel plate, the low carbon content can cause the low strength of the steel and increase the smelting difficulty, the high carbon content can cause the toughness, the plasticity and the welding property of the steel to be reduced, and the content is designed according to the requirements of the strength and the wear resistance.
Si: 2.20-2.66%, silicon is the main reducing agent and deoxidizing agent in the steel-making process, and a certain amount of silicon is contained in killed steel, and can improve the elastic limit, yield strength and tensile strength of the steel and the wear resistance of the steel plate.
Mn: 1.40-1.60%, low manganese cost, good deoxidizer and desulfurizer, and can increase steel toughness, strength and hardness, improve steel hardenability, and improve steel hot workability.
P is less than or equal to 0.015 percent, phosphorus is a harmful element in steel under the general condition, 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 controlling the cost reasonably.
S is less than or equal to 0.005 percent, sulfur is also a harmful element in steel, the hot brittleness of the steel is increased, the ductility and the toughness of the steel are reduced, but the easy cutting performance of the steel can be increased by the sulfur, and the content of the sulfur in the steel is reduced as much as possible under the economic benefit unless special requirements are met.
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 a steel plate can be improved by adding a certain content of chromium, but the chromium is added too high, the chromium and manganese can form low-melting-point Cr-Mn composite oxide, surface cracks are formed in the hot working process, and the chromium content of the invention is determined according to multiple test conditions.
Nb: 0.025-0.050%, niobium can promote grain refinement of the steel plate microstructure, and can improve strength and toughness, effectively refine the microstructure by inhibiting austenite recrystallization in the rolling process, improve steel hardenability by precipitation strengthening, reduce steel overheating sensitivity, and improve welding performance.
Mo: 0.25-0.45%, molybdenum has greater improvement to intensity, plasticity and low-temperature impact toughness, because Mo can make C curve of steel shift to the right when solid solution is in ferrite and austenite, thus obviously improve the hardenability of steel; molybdenum can obviously improve the recrystallization temperature of the steel, and molybdenum can also improve the obdurability of the steel.
Al: 0.020-0.050% of aluminum, a common deoxidizer in steel, and a small amount of aluminum added into the steel, so that crystal grains can be refined, the impact toughness is improved, the steel also has oxidation resistance and corrosion resistance, and the hot workability, the welding performance and the cutting workability of the steel are influenced by overhigh content of the aluminum.
Adopt the produced beneficial effect of above-mentioned technical scheme to 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 of noble metals such as Cr, mo and the like is reduced, and meanwhile, the production cost of the steel plate is reduced by not adding the noble metal Ni. Through the component design scheme, the addition of the 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. According to the invention, the endogenous impurities generated by the molten steel are reduced and the purity of the molten steel is improved by adopting LF refining, VD vacuum, calcium treatment and soft blowing processes.
3. The invention ensures that the steel plate has good obdurability and wear resistance through reasonable heating rolling process and quenching and tempering heat treatment process, meets the use requirement of users on high wear resistance, and has wide application prospect.
4. The thickness 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 surface position of the plate thickness 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 inevitable impurities.
The production method of the high-silicon wear-resistant steel plate comprises the working procedures of steel making, continuous casting, heating rolling and quenching and tempering heat treatment, and comprises the following specific process steps:
(1) A steel making process: and (2) sending the qualified molten steel smelted by the primary smelting furnace into an LF refining furnace for refining, keeping white slag for 31min in the LF refining process, adding silicon alloy, keeping the total refining time for 68min, sending the molten steel into a VD furnace for vacuum degassing treatment after the molten steel is qualified after the LF furnace is refined, keeping the high vacuum degree of 40Pa for 20min, carrying out soft blowing for 8min after vacuum destruction, and simultaneously feeding a calcium wire of 2.0m/t of molten steel for calcium treatment to promote spheroidization and upward floating of inclusions.
(2) And (3) continuous casting process: and casting the steel plate blank by a large plate blank continuous casting machine, wherein the superheat degree of the molten steel is 15 ℃.
(3) A heating rolling procedure: and heating the casting blank in a continuous furnace, wherein the charging temperature of the casting blank is 310 ℃, the temperature of the heat preservation stage is controlled at 1230 ℃, and the total heating time is 310min. The initial rolling temperature is 1070 ℃, the rolling is carried out by adopting large reduction, the reduction rate of each pass is 16 percent in the first two passes, and the final rolling temperature is 880 ℃.
(4) Quenching and tempering heat treatment process: the quenching temperature is 900 ℃, the heating time is 1.9min/mm, the steel plate tempering temperature is 400 ℃, the heating time is 3.3min/mm, and the steel plate is obtained after air cooling after tempering.
The whole plate thickness of the steel plate has yield strength of 1406MPa, tensile strength of 1634MPa, transverse impact energy of 78J at 20 ℃, plate thickness surface position hardness of 490HBW and good wear resistance.
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 inevitable impurities.
The production method of the high-silicon wear-resistant steel plate comprises the working procedures of steel making, continuous casting, heating rolling and quenching and tempering heat treatment, and comprises the following specific process steps:
(1) A steel-making process: and (2) sending the qualified molten steel smelted by the primary smelting furnace into an LF refining furnace for refining, keeping white slag for 30min in the LF refining process, adding silicon alloy, keeping the total refining time for 60min, sending the molten steel into a VD furnace for vacuum degassing treatment after the molten steel is qualified after the LF furnace is refined, keeping the high vacuum degree of 55Pa for 20min, carrying out soft blowing for 10min after vacuum destruction, and meanwhile, feeding a calcium wire of 1.8m/t of molten steel for calcium treatment to promote spheroidization and upward floating of inclusions.
(2) And (3) continuous casting process: and casting the steel plate blank into the steel plate blank by a large plate blank continuous casting machine, wherein the superheat degree of the molten steel is 20 ℃.
(3) A heating rolling procedure: and 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 controlled at 1240 ℃, and the total heating time is 320min. The initial rolling temperature is 1060 ℃, the rolling is carried out under large reduction, the reduction rate of each pass is 15 percent in the first two passes, and the final rolling temperature is 850 ℃.
(4) Quenching and tempering heat treatment process: the quenching temperature is 900 ℃, the heating time is 1.8min/mm, the steel plate tempering temperature is 410 ℃, the heating time is 3.5min/mm, and the steel plate is obtained after air cooling after tempering.
The yield strength of the whole plate thickness of the steel plate is 1369MPa, the tensile strength is 1596MPa, the transverse impact energy at 20 ℃ is 63J, the hardness of the plate thickness surface position 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 inevitable impurities.
The production method of the high-silicon wear-resistant steel plate comprises the working procedures of steel making, continuous casting, heating rolling and quenching and tempering heat treatment, and comprises the following specific process steps:
(1) A steel making process: and (2) sending the qualified molten steel smelted by the primary smelting furnace into an LF refining furnace for refining, keeping white slag for 33min in the LF refining process, adding silicon alloy, keeping the total refining time for 65min, sending the molten steel into a VD furnace for vacuum degassing treatment after the molten steel is qualified after the LF furnace is refined, keeping the high vacuum degree for 66.7Pa for 21min, carrying out soft blowing for 9min after vacuum destruction, and simultaneously feeding a calcium wire of 1.6m/t of molten steel for calcium treatment to promote spheroidization and upward floating of inclusions.
(2) And (3) continuous casting process: and casting the steel plate blank into the steel plate blank by a large plate blank continuous casting machine, wherein the superheat degree of the molten steel is 25 ℃.
(3) A heating rolling procedure: and heating the casting blank in a continuous furnace, wherein the charging temperature of the casting blank is 310 ℃, the temperature of a heat preservation stage is 1250 ℃, and the total heating time is 300min. The initial rolling temperature is 1050 ℃, the high reduction rolling is adopted, the reduction rate of each pass is 17 percent in the first two passes, and the final rolling temperature is 870 ℃.
(4) Quenching and tempering heat treatment process: 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 air cooling after tempering.
The yield strength of the whole plate thickness of the steel plate is 1350MPa, the tensile strength is 1675MPa, the transverse impact energy at 20 ℃ is 50J, the hardness of the surface position of the plate thickness 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 working procedures of steel making, continuous casting, heating rolling and quenching and tempering heat treatment, and comprises the following specific process steps:
(1) A steel-making process: and (2) sending the qualified molten steel smelted by the primary smelting furnace into an LF refining furnace for refining, keeping white slag for 33min in the LF refining process, adding silicon alloy, keeping the total refining time for 60min, sending the molten steel into a VD furnace for vacuum degassing treatment after the molten steel is qualified after the LF furnace is refined, keeping the high vacuum degree of 60Pa for 22min, carrying out soft blowing for 9min after vacuum destruction, and meanwhile, feeding a calcium wire of 1.5m/t of molten steel for calcium treatment to promote spheroidization and upward floating of inclusions.
(2) And (3) continuous casting process: and casting the steel plate blank by a large plate blank continuous casting machine, wherein the superheat degree of the molten steel is 22 ℃.
(3) A heating rolling procedure: and heating the casting blank in a continuous furnace, wherein the charging temperature of the casting blank is 300 ℃, the temperature in the heat preservation stage is controlled at 1260 ℃, and the total heating time is 310min. The initial rolling temperature is 1060 ℃, the rolling is carried out under large reduction, the reduction rate of each pass is 18 percent in the first two passes, and the final rolling temperature is 860 ℃.
(4) Quenching and tempering heat treatment process: the quenching temperature is 910 ℃, the heating time is 2.0min/mm, the tempering temperature of the steel plate is 430 ℃, the heating time is 3.4min/mm, and the steel plate is obtained after air cooling after tempering.
The yield strength 1412MPa, the tensile strength 1685MPa, the transverse impact energy 58J at 20 ℃ of the whole plate thickness of the steel plate, the hardness 506HBW of the surface position of the plate thickness and good wear resistance.
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 percent, and the balance of Fe and inevitable impurities.
The production method of the high-silicon wear-resistant steel plate comprises the working procedures of steel making, continuous casting, heating rolling and quenching and tempering heat treatment, and comprises the following specific process steps:
(1) A steel making process: and (2) sending the qualified molten steel smelted by the primary smelting furnace into an LF refining furnace for refining, keeping white slag for 31min in the LF refining process, adding silicon alloy, keeping the total refining time for 70min, sending the molten steel into a VD furnace for vacuum degassing treatment after the molten steel is qualified after the LF furnace is refined, keeping the high vacuum degree of 40Pa for 23min, carrying out soft blowing for 8min after vacuum destruction, and meanwhile, feeding a calcium wire of 1.7m/t of molten steel for calcium treatment to promote spheroidization and upward floating of inclusions.
(2) And (3) continuous casting process: and casting the steel plate blank by a large plate blank continuous casting machine, wherein the superheat degree of the molten steel is 19 ℃.
(3) A heating rolling procedure: and 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 ℃, the rolling is carried out under large reduction, the reduction rate of each pass is 16 percent in the first two passes, and the final rolling temperature is 870 ℃.
(4) Quenching and tempering heat treatment process: the quenching temperature is 900 ℃, the heating time is 1.8min/mm, the tempering temperature of the steel plate is 420 ℃, the heating time is 3.2min/mm, and the steel plate is obtained after air cooling after tempering.
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 hardness of the surface position 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 inevitable impurities.
The production method of the high-silicon wear-resistant steel plate comprises the working procedures of steel making, continuous casting, heating rolling and quenching and tempering heat treatment, and comprises the following specific process steps:
(1) A steel making process: and (2) sending the qualified molten steel smelted by the primary smelting furnace into an LF refining furnace for refining, keeping white slag for 30min in the LF refining process, adding silicon alloy, keeping the total refining time for 64min, sending the molten steel into a VD furnace for vacuum degassing treatment after the molten steel is qualified after the LF furnace is refined, keeping the high vacuum degree of 50Pa for 24min, carrying out soft blowing for 10min after vacuum destruction, and meanwhile, feeding a calcium wire of 1.9m/t of molten steel for calcium treatment to promote spheroidization and upward floating of inclusions.
(2) And (3) a continuous casting process: and casting the steel plate blank by a large plate blank continuous casting machine, wherein the superheat degree of the molten steel is 18 ℃.
(3) A heating rolling procedure: and 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 controlled at 1230 ℃, and the total heating time is 330min. The initial rolling temperature is 1080 ℃, the rolling is carried out by adopting large reduction, the reduction rate of each pass is 17 percent in the first two passes, and the final rolling temperature is 880 ℃.
(4) Quenching and tempering heat treatment process: the quenching temperature is 890 ℃, the heating time is 1.9min/mm, the tempering temperature of the steel plate is 430 ℃, the heating time is 3.1min/mm, and the steel plate is obtained after air cooling after tempering.
The yield strength of the whole plate thickness of the steel plate is 1364MPa, the tensile strength is 1547MPa, the transverse impact energy at 20 ℃ is more than or equal to 81J, the hardness of the surface position of the plate thickness is 464HBW, and the wear resistance is good.
Example 7
The thickness of the high-silicon wear-resistant steel plate produced in the embodiment is 30mm, and the high-silicon wear-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 percent, and the balance of Fe and inevitable impurities.
The production method of the high-silicon wear-resistant steel plate comprises the working procedures of steel making, continuous casting, heating rolling and quenching and tempering heat treatment, and comprises the following specific process steps:
(1) A steel making process: and (2) sending the qualified molten steel smelted by the primary smelting furnace into an LF refining furnace for refining, keeping white slag for 35min in the LF refining process, adding silicon alloy, keeping the total refining time for 63min, sending the molten steel into a VD furnace for vacuum degassing treatment after the molten steel is qualified after the LF furnace is refined, keeping the high vacuum degree of 50Pa for 22min, carrying out soft blowing for 9min after vacuum destruction, and meanwhile, feeding a calcium wire of 2.0m/t of molten steel for calcium treatment to promote spheroidization and upward floating of inclusions.
(2) And (3) a continuous casting process: and casting the steel plate blank by a large plate blank continuous casting machine, wherein the superheat degree of the molten steel is 21 ℃.
(3) A heating rolling procedure: and heating the casting blank in a continuous furnace, wherein the charging temperature of the casting blank is 320 ℃, the temperature in the heat preservation stage is controlled at 1220 ℃, and the total heating time is 310min. The initial rolling temperature is 1090 ℃, the rolling is carried out under large reduction, the reduction rate of each pass is 15 percent in the first two passes, and the final rolling temperature is 860 ℃.
(4) Quenching and tempering heat treatment process: 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 air cooling after tempering.
The steel plate has the advantages of 1375MPa of yield strength of the whole plate thickness, 1532MPa of tensile strength, 93J of transverse impact energy at 20 ℃, 460HBW of plate thickness surface position hardness and good wear resistance.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (10)
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%, si:2.20 to 2.66%, mn: 1.40-1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, cr:0.40 to 0.60%, mo:0.25 to 0.45%, nb:0.020 to 0.050%, al: 0.020-0.050% and the balance of Fe and inevitable impurities.
2. The high-silicon wear-resistant steel plate as claimed in claim 1, wherein the thickness of the steel plate is 20-50 mm.
3. The high-silicon wear-resistant steel plate as claimed in claim 1, wherein the steel plate has a total plate thickness yield strength of 1350MPa or more, a tensile strength of 1500MPa or more, a 20 ℃ transverse impact energy of 50J or more, and a surface hardness of 450HBW or more.
4. The method for producing a high-silicon wear-resistant steel plate as claimed in any one of claims 1 to 3, wherein the method comprises the steps of steel making, continuous casting, hot rolling and temper heat treatment.
5. The method for producing the high-silicon wear-resistant steel plate as claimed in claim 4, wherein in the steelmaking process, the qualified molten steel smelted in the primary smelting furnace is sent to an LF refining furnace for refining, in the LF refining process, the silicon alloy is added after the white slag is kept for more than or equal to 30min, and the total refining time is more than or equal to 60min.
6. The method for producing the high-silicon wear-resistant steel plate according to claim 4, wherein in the steel-making process, after molten steel is qualified after refining in an LF (ladle furnace), the molten steel is sent into a VD (vacuum degassing) furnace for vacuum degassing treatment, the high vacuum degree is required to be less than or equal to 66.7Pa, the high vacuum retention time is required to be more than or equal to 20min, soft blowing is carried out for 8-10 min after vacuum breaking, and meanwhile, calcium wires of 1.5-2.0 m/t of molten steel are fed for calcium treatment to promote spheroidization and floating of inclusions.
7. The method for producing the high-silicon wear-resistant steel plate according to claim 4, wherein the continuous casting process is performed by a large slab caster to form a slab, and the superheat degree of the molten steel is controlled to be 15-25 ℃.
8. The method for producing the high-silicon wear-resistant steel plate according to claim 4, wherein in the heating and rolling process, 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 to be 1220-1260 ℃, and the total heating time is more than or equal to 300min.
9. The production method of the high-silicon wear-resistant steel plate as claimed in claim 4, wherein the rolling procedure is performed at a start rolling temperature of 1050-1100 ℃, and the rolling procedure is performed at a high reduction, wherein the reduction rate of each pass is more than or equal to 15% in the first two passes, and the final rolling temperature is 850-880 ℃.
10. The method for producing the high-silicon wear-resistant steel plate according to claim 4, wherein in the quenching and tempering heat treatment process, the quenching temperature is 890-910 ℃, the heating time is 1.8-2.0 min/mm, the tempering temperature of the steel plate is 400-430 ℃, the heating time is 3.0-3.5 min/mm, and the steel plate is obtained after air cooling after the tempering.
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