CN114672617A - HB450 grade online water-cooling wear-resistant steel plate resistant to low-temperature impact at-40 ℃ and preparation method thereof - Google Patents
HB450 grade online water-cooling wear-resistant steel plate resistant to low-temperature impact at-40 ℃ and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
Abstract
The invention relates to the technical field of metal material manufacturing, in particular to an HB450 grade online water-cooling wear-resistant steel plate capable of resisting low-temperature impact at-40 ℃ and a preparation method thereof. The steel plate comprises the following chemical components: 0.20-0.26%, Si: 0.10-0.20%, Mn: 0.60-1.10%, P is less than or equal to 0.010%, S is less than or equal to 0.003%, Ni: 0.30-0.80%, Cr: 0.70% -1.00%, Mo: 0.10-0.40%, Ti: 0.015% -0.030%, Al: 0.030-0.070%, B: 0.0008 to 0.0035 percent, less than or equal to 0.0025 percent of O, less than or equal to 0.0030 percent of N, less than or equal to 0.00018 percent of H, and the balance of Fe and inevitable impurities. The steel plate has the characteristics of short production process flow, good low-temperature impact toughness and high surface hardness.
Description
Technical Field
The invention relates to the technical field of metal material manufacturing, in particular to an HB450 grade online water-cooling wear-resistant steel plate capable of resisting low-temperature impact at-40 ℃ and a preparation method thereof.
Background
The wear-resistant steel plate is a key material for manufacturing engineering equipment such as coal mine machinery, port machinery, engineering machinery, mining equipment, self-discharging mine cars and the like. In recent years, the characteristics of equipment upsizing and heaviness are increasingly remarkable, and a multi-scene application environment puts higher requirements on the service performance of the wear-resistant steel plate. At present, for the production of high-grade wear-resistant steel, an off-line quenching heat treatment mode is generally adopted, the tempering temperature is high, the production mode has long process flow and high heat treatment cost, and the efficiency is not favorably improved, and the energy conservation and the environmental protection are not favorably realized; in addition, impact toughness has a great influence on wear resistance under complex wear conditions, but at the present stage, the low-temperature (-40 ℃) impact toughness of wear-resistant steel is rarely researched. Therefore, shortening the production process flow of high-grade wear-resistant steel and developing wear-resistant steel products resistant to low-temperature impact at minus 40 ℃ are one of the important directions of the development of the current wear-resistant steel.
The Chinese patent application CN201710899388.7 discloses a high-strength wear-resistant steel plate for mining machinery, which is designed by adopting high-C (0.7-0.9%) and high-Mn (1.6-1.8%), has high C, Mn content, easily generates center segregation in a continuous casting billet, easily generates cracks in the steel plate, and has poor welding performance; in addition, offline quenching is adopted, the quenching temperature is Ac3+ 0-100 ℃, the process flow is long, and meanwhile, the heat treatment cost is increased, so that the energy is not saved; and low temperature impact performance studies are not involved.
The Chinese patent application CN202010949264.7 discloses a martensite high-temperature wear-resistant steel and a production method thereof, wherein an off-line quenching process is adopted, the quenching temperature is Ac3+ 30-50 ℃, the process flow is long, and meanwhile, the heat treatment cost is increased, so that the energy is not saved; and low temperature impact performance studies are not involved.
The Chinese patent application CN201010200002.7 discloses a high-strength high-toughness low-alloy wear-resistant steel and a manufacturing method thereof, the steel is designed by adopting high Mn (1.2-1.6 percent), the Mn content is high, the continuous casting billet is easy to generate center segregation, the steel plate is easy to generate cracks, and meanwhile, the welding performance is poor; off-line quenching is adopted, the process flow is long, and meanwhile, the heat treatment cost is increased, so that the energy is not saved; in addition, only the impact absorption work at-20 ℃ is mentioned to be above 60J, and the impact absorption work at-40 ℃ is not mentioned.
The Chinese patent application CN201810398720.6 discloses a low-cost high-hardenability HB 450-grade medium plate wear-resistant steel plate and a manufacturing method thereof, wherein excessively high Si (1.4-1.6%) and Mn (3.7-4%) are added, the welding performance of the steel plate is easily reduced due to excessively high Si content, the welding crack sensitivity is increased, and the center segregation of a continuous casting billet is easily caused due to high Mn content; in addition, higher V (0.15% -0.25%) is added, and the alloy cost is increased; the invention does not undergo LF external refining in the steel-making process, can not effectively control the content of impurities in the molten steel, and finally influences the impact property of the steel plate; high-temperature tempering is adopted, so that the energy consumption is increased, and the heat treatment cost is increased; and low temperature impact performance studies are not involved.
As can be seen, the conditions of simultaneously researching the short-flow production process of the high-grade wear-resistant steel and the low-temperature impact toughness at minus 40 ℃ are few in the prior art, so that the development of the HB 450-grade wear-resistant steel plate resistant to the low-temperature impact at minus 40 ℃ and the manufacturing method thereof are very practical.
Disclosure of Invention
Aiming at the problem that the prior art lacks a short-process production process for high-grade wear-resistant steel and simultaneous research on-40 ℃ low-temperature impact toughness, the invention provides an HB 450-grade online water-cooling wear-resistant steel plate resistant to-40 ℃ low-temperature impact and a preparation method thereof, aiming at saving cost and improving production efficiency and low-temperature impact toughness, through the procedures of clean smelting, continuous casting, rolling, water cooling, heat treatment and the like, the yield strength of the produced steel plate is more than or equal to 1150MPa, the tensile strength is more than or equal to 1250MPa, the elongation after fracture is more than or equal to 8 percent, the-40 ℃ impact absorption power is more than or equal to 40J, the surface Brinell hardness is 440-470 HBW, and the steel plate has the characteristics of short production process, good low-temperature impact toughness and high surface hardness.
In a first aspect, the invention provides a preparation method of an HB 450-grade online water-cooling wear-resistant steel plate capable of resisting low-temperature impact at-40 ℃, wherein the HB 450-grade online water-cooling wear-resistant steel plate comprises the following chemical components in percentage by weight: 0.20-0.26%, Si: 0.10-0.20%, Mn: 0.60-1.10%, P is less than or equal to 0.010%, S is less than or equal to 0.003%, Ni: 0.30-0.80%, Cr: 0.70% -1.00%, Mo: 0.10-0.40%, Ti: 0.015% -0.030%, Al: 0.030-0.070%, B: 0.0008 to 0.0035 percent, less than or equal to 0.0025 percent of O, less than or equal to 0.0030 percent of N, less than or equal to 0.00018 percent of H, and the balance of Fe and inevitable impurities;
the preparation method of the HB450 grade online water-cooling wear-resistant steel plate comprises smelting, continuous casting, heating, rolling, online water-cooling and heat treatment.
Furthermore, the smelting process adopts a converter smelting and double refining (LF + RH) process, and harmful elements and inclusions such as P, S, O, N, H and the like are strictly controlled.
Furthermore, the superheat degree of a tundish in the continuous casting process is controlled at 10-20 ℃, the whole process is protected for pouring, the pulling speed fluctuation of a casting machine is controlled at a target value +/-0.1 m/min, the thickness of a casting blank is 200-300 mm, and the casting blank is stacked in a slow cooling pit and slowly cooled for more than 60 hours.
Furthermore, the target value of the casting machine pulling speed is 0.9-1.3 m/min.
Furthermore, the heating time of the casting blank in the heating process is 3.0-6.0 h, and the discharging temperature is controlled to be 1230-1260 ℃.
Furthermore, high-pressure water descaling is carried out after the casting blank is discharged from the furnace, and the pressure of the descaling water is more than or equal to 24MPa, so that the descaling is ensured to be clean.
Further, the rolling process comprises the following specific steps:
a rough rolling and finish rolling mode is adopted, the initial rolling temperature of rough rolling is 1130-1170 ℃, a large reduction mode is adopted in the rough rolling stage, the rolling reduction rate of the first pass and the last pass in the rough rolling stage is more than or equal to 20%, and the rolling reduction of the middle pass is more than or equal to 25 mm; the thickness of the intermediate blank is at least 2.3 times of that of the finished steel plate;
before finishing rolling, the intermediate blank is heated; the finish rolling initial rolling temperature of a finished steel plate with the thickness of [10,20] mm is 1020-1060 ℃, and the finish rolling temperature is 920-960 ℃; and (3) finishing the steel plate with the thickness of (20, 50) mm at the rolling start temperature of 940-980 ℃ and the rolling finish temperature of 880-920 ℃.
Furthermore, the start cooling temperature of the online water cooling process is more than or equal to 850 ℃, the final cooling temperature is 350-400 ℃, and the cooling speed is more than or equal to 30 ℃/more than or equal to.
Further, the heat treatment process adopts tempering treatment, the tempering heating temperature is less than or equal to 200 ℃, the heat preservation time is 35-120 min, and the steel plate is taken out of a furnace and cooled in air to obtain the HB450 grade online water-cooling wear-resistant steel plate.
In a second aspect, the invention provides an HB450 grade online water-cooling wear-resistant steel plate which is resistant to low-temperature impact at-40 ℃ and is produced by the preparation method.
Furthermore, the thickness of the HB450 grade on-line water-cooling wear-resistant steel plate is 10-50 mm.
Furthermore, the yield strength of the HB450 grade online water-cooling wear-resistant steel plate is more than or equal to 1150MPa, the tensile strength is more than or equal to 1250MPa, the elongation after fracture is more than or equal to 8 percent, the impact absorption energy at minus 40 ℃ is more than or equal to 40J, and the surface Brinell hardness is 440-470 HBW.
The invention has the beneficial effects that:
(1) the austenite region is enlarged and A is reduced by reasonable component design3The temperature is increased, the martensite start transformation temperature (M is more than or equal to), the realization of the start cooling temperature and the martensite structure transformation are better ensured, the lower start cooling temperature and the higher finish cooling temperature are realized, and the process is simple and efficient; (2) the off-line quenching is not needed, and the on-line water cooling and low-temperature tempering process is adopted, so that the process flow is greatly shortened, the heat treatment cost is reduced, and the energy consumption is reduced.
The preparation method disclosed by the invention realizes the production of the HB 450-grade online water-cooling wear-resistant steel plate with-40 ℃ low-temperature impact resistance, the yield strength of the steel is 1170-1260 MPa, the tensile strength is more than or equal to 1350MPa, the elongation after fracture is 9-17%, the impact absorption power at-40 ℃ is 40-86J, the surface Brinell hardness is 440-470 HBW, the performance margin is appropriate, the low-temperature impact toughness is good, and the quality is stable.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a typical scanning electron microscope organization picture of HB450 grade on-line water-cooling wear-resistant steel plate produced in example 1 of the invention.
FIG. 2 is a typical scanning electron microscope structural picture of HB450 grade on-line water-cooling wear-resistant steel plate produced in example 2 of the invention.
FIG. 3 is a typical scanning electron microscope structural picture of HB450 grade on-line water-cooling wear-resistant steel plate produced in example 3 of the invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
An HB450 grade online water-cooling wear-resistant steel plate resistant to low-temperature impact at-40 ℃ has a thickness of 10mm and comprises the following chemical components in percentage by weight: 0.22%, Si: 0.15%, Mn: 0.75%, P: 0.007%, S: 0.001%, Ni: 0.42%, Cr: 0.75%, Mo: 0.21%, Ti: 0.023 percent, Al is more than or equal to: 0.048%, B: 0.0014%, O: 0.0016%, N: 0.0022%, H: 0.00012 percent, and the balance of Fe and inevitable impurities.
The HB 450-grade online water-cooling wear-resistant steel plate is produced according to the following preparation method:
(1) smelting: smelting according to steel plate components, adopting a converter smelting and double refining (LF + RH) process, and strictly controlling P, S, O, N, H and other harmful elements and inclusions.
(2) Continuous casting: the superheat degree of the tundish is controlled at 10-20 ℃, the whole process protects the pouring, and the drawing speed fluctuation of the casting machine is controlled at 1.2 +/-0.1 m/min; and (4) stacking the casting blanks into a slow cooling pit for slow cooling for 65h, wherein the thickness of the casting blanks is 200 mm.
(3) Heating: the heating time of the casting blank is 3.2h, and the tapping temperature is controlled to be 1253 ℃.
(4) Rolling: the casting blank is discharged and then is descaled by high-pressure water, the pressure of the descaling water is more than or equal to 24MPa, and the descaling is ensured to be clean;
adopting a rolling mode of rough rolling and finish rolling; the initial rolling temperature of rough rolling is 1170 ℃, a large reduction mode is adopted in the rough rolling stage, the rolling reduction rates of the first pass and the last pass in the rough rolling stage are 23% and 21% respectively, and the rolling reduction of the middle pass is more than or equal to 25 mm; the thickness of the intermediate blank is 45 mm; and (3) carrying out intermediate billet temperature waiting before the finish rolling is started, wherein the start rolling temperature of the finish rolling is 1050 ℃, and the finish rolling temperature is 932 ℃.
(5) Online water cooling: and carrying out on-line water cooling on the rolled steel plate, wherein the start cooling temperature is 859 ℃, the finish cooling temperature is 388 ℃, and the cooling speed is 30 ℃/> or more.
(6) Tempering: tempering and heating at 160 ℃, keeping the temperature for 35min, discharging and air cooling to obtain the HB450 grade online water-cooling wear-resistant steel plate.
The mechanical properties of the HB450 grade online water-cooling wear-resistant steel plate are detected, and the results are shown in the following table 1.
Table 1 mechanical properties of the steel sheets of example 1
Example 2
An HB450 grade online water-cooling wear-resistant steel plate resistant to low-temperature impact at-40 ℃ has a thickness of 30mm and comprises the following chemical components in percentage by weight: 0.24%, Si: 0.17%, Mn: 0.86%, P: 0.007%, S: 0.001%, Ni: 0.61%, Cr: 0.86%, Mo: 0.29%, Ti: 0.021%, Al is more than or equal to: 0.055%, B: 0.0018%, O: 0.0021%, N: 0.0026%, H: 0.00016 percent, and the balance of Fe and inevitable impurities.
The HB 450-grade online water-cooling wear-resistant steel plate is produced according to the following preparation method:
(1) smelting: smelting according to steel plate components, adopting a converter smelting and double refining (LF + RH) process, and strictly controlling P, S, O, N, H and other harmful elements and inclusions.
(2) Continuous casting: the superheat degree of the tundish is controlled at 10-20 ℃, the casting is protected in the whole process, and the pulling speed fluctuation of the casting machine is controlled at 1.0 +/-0.1 m/min; and (4) stacking the casting blanks into a slow cooling pit for slow cooling for 70h, wherein the thickness of the casting blanks is 300 mm.
(3) Heating: the heating time of the casting blank is 5.0h, and the tapping temperature is controlled to be 1245 ℃.
(4) Rolling: the casting blank is discharged and then is descaled by high-pressure water, the pressure of the descaling water is more than or equal to 24MPa, and the descaling is ensured to be clean;
adopting a rolling mode of rough rolling and finish rolling; the initial rolling temperature of rough rolling is 1162 ℃, a large reduction mode is adopted in the rough rolling stage, the rolling reduction rates of the first pass and the last pass in the rough rolling stage are 22% and 21% respectively, and the rolling reduction of the middle pass is more than or equal to 25 mm; the thickness of the intermediate blank is 90 mm; before the finish rolling is started, the intermediate blank is heated to 972 ℃ and the finish rolling temperature is 916 ℃.
(5) Online water cooling: and carrying out on-line water cooling on the rolled steel plate, wherein the start cooling temperature is 874 ℃, the final cooling temperature is 380 ℃, and the cooling speed is 31 ℃/> or more.
(6) Tempering: tempering and heating at 180 ℃, keeping the temperature for 65min, discharging and air cooling to obtain the HB450 grade online water-cooling wear-resistant steel plate.
The mechanical properties of the HB450 grade online water-cooling wear-resistant steel plate are detected, and the results are shown in the following table 2.
Table 2 mechanical properties of the steel sheets of example 2
Example 3
An HB450 grade online water-cooling wear-resistant steel plate resistant to low-temperature impact at-40 ℃ has a thickness of 50mm and comprises the following chemical components in percentage by weight: 0.25%, Si: 0.14%, Mn: 1.00%, P: 0.006%, S: 0.001%, Ni: 0.74%, Cr: 0.92%, Mo: 0.36%, Ti: 0.025%, Al is more than or equal to: 0.053%, B: 0.0015%, O: 0.0019%, N: 0.0023%, H: 0.00012 percent, and the balance of Fe and inevitable impurities.
The HB 450-grade online water-cooling wear-resistant steel plate is produced according to the following preparation method:
(1) smelting: smelting according to steel plate components, adopting a converter smelting and double refining (LF + RH) process, and strictly controlling P, S, O, N, H and other harmful elements and inclusions.
(2) Continuous casting: controlling the superheat degree of the tundish at 10-20 ℃, protecting the casting in the whole process, and controlling the pulling speed fluctuation of the casting machine at 0.95 +/-0.1 m/min; and (4) stacking the casting blanks into a slow cooling pit for slow cooling for 72h, wherein the thickness of the casting blanks is 300 mm.
(3) Heating: the heating time of the casting blank is 5.3h, and the tapping temperature is controlled at 1240 ℃.
(4) Rolling: the casting blank is discharged and then is descaled by high-pressure water, the pressure of the descaling water is more than or equal to 24MPa, and the descaling is ensured to be clean;
adopting a rolling mode of rough rolling and finish rolling; the initial rolling temperature of rough rolling is 1159 ℃, a large reduction mode is adopted in the rough rolling stage, the rolling reduction rates of the first pass and the last pass in the rough rolling stage are respectively 20% and 22%, and the rolling reduction of the middle pass is more than or equal to 25 mm; the thickness of the intermediate blank is 115 mm; and (3) carrying out intermediate billet temperature waiting before the finish rolling is started, wherein the start rolling temperature of the finish rolling is 951 ℃, and the finish rolling temperature of the finish rolling is 902 ℃.
(5) Online water cooling: and carrying out on-line water cooling on the rolled steel plate, wherein the start cooling temperature is 884 ℃, the final cooling temperature is 352 ℃, and the cooling speed is 32 ℃/> or more.
(6) Tempering: tempering and heating at 200 ℃, keeping the temperature for 120min, discharging and air cooling to obtain the HB450 grade online water-cooling wear-resistant steel plate.
The mechanical properties of the HB450 grade online water-cooling wear-resistant steel plate are detected, and the results are shown in the following table 3.
Table 3 mechanical properties of the steel sheets of example 3
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention.
Claims (10)
1. The preparation method of the HB 450-grade online water-cooling wear-resistant steel plate resistant to low-temperature impact at-40 ℃ is characterized in that the HB 450-grade online water-cooling wear-resistant steel plate comprises the following chemical components in percentage by weight: 0.20-0.26%, Si: 0.10-0.20%, Mn: 0.60-1.10%, P is less than or equal to 0.010%, S is less than or equal to 0.003%, Ni: 0.30-0.80%, Cr: 0.70% -1.00%, Mo: 0.10-0.40%, Ti: 0.015% -0.030%, Al: 0.030-0.070%, B: 0.0008 to 0.0035 percent, less than or equal to 0.0025 percent of O, less than or equal to 0.0030 percent of N, less than or equal to 0.00018 percent of H, and the balance of Fe and inevitable impurities;
The preparation method of the HB450 grade online water-cooling wear-resistant steel plate comprises smelting, continuous casting, heating, rolling, online water-cooling and heat treatment.
2. The preparation method according to claim 1, wherein the superheat degree of the tundish in the continuous casting process is controlled to be 10-20 ℃, the casting is protected in the whole process, the pulling speed fluctuation of a casting machine is controlled to be within a target value of +/-0.1 m/min, the thickness of the casting blank is 200-300 mm, and the casting blank is stacked in a slow cooling pit and slowly cooled for more than 60 hours.
3. The method according to claim 2, wherein the target casting machine casting speed is 0.9 to 1.3 m/min.
4. The preparation method according to claim 1, wherein the heating time of the casting blank in the heating process is 3.0-6.0 h, and the tapping temperature is controlled to be 1230-1260 ℃.
5. The preparation method according to claim 1, wherein the rolling process comprises the following specific steps:
a rough rolling and finish rolling mode is adopted, the initial rolling temperature of rough rolling is 1130-1170 ℃, a large reduction mode is adopted in the rough rolling stage, the rolling reduction rate of the first pass and the last pass in the rough rolling stage is more than or equal to 20%, and the rolling reduction of the middle pass is more than or equal to 25 mm; the thickness of the intermediate blank is at least 2.3 times of that of the finished steel plate;
before finishing rolling, the intermediate blank is heated; the finish rolling initial rolling temperature of a finished steel plate with the thickness of [10,20] mm is 1020-1060 ℃, and the finish rolling temperature is 920-960 ℃; and (3) finishing the steel plate with the thickness of (20, 50) mm at the rolling start temperature of 940-980 ℃ and the rolling finish temperature of 880-920 ℃.
6. The preparation method according to claim 1, wherein the on-line water cooling step has a start cooling temperature of 850 ℃ or more, a finish cooling temperature of 350 to 400 ℃, and a cooling rate of 30 ℃ or more/not more.
7. The preparation method according to claim 1, wherein the heat treatment process adopts tempering treatment, the tempering heating temperature is less than or equal to 200 ℃, the heat preservation time is 35-120 min, and the steel plate is discharged from a furnace and cooled by air to obtain the HB450 grade online water-cooling wear-resistant steel plate.
8. An HB450 grade online water-cooling wear-resistant steel plate with-40 ℃ low-temperature impact resistance, which is produced by the preparation method of any one of claims 1 to 7.
9. The HB450 grade online water-cooling wear-resistant steel plate of claim 8, wherein the thickness of the HB450 grade online water-cooling wear-resistant steel plate is 10-50 mm.
10. The HB450 grade online water-cooling wear-resistant steel plate of claim 8, wherein the yield strength of the HB450 grade online water-cooling wear-resistant steel plate is not less than 1150MPa, the tensile strength is not less than 1250MPa, the elongation after fracture is not less than 8%, the impact absorption energy at-40 ℃ is not less than 40J, and the surface Brinell hardness is 440-470 HBW.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210269548.0A CN114672617A (en) | 2022-03-18 | 2022-03-18 | HB450 grade online water-cooling wear-resistant steel plate resistant to low-temperature impact at-40 ℃ and preparation method thereof |
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|---|---|---|---|
| CN202210269548.0A CN114672617A (en) | 2022-03-18 | 2022-03-18 | HB450 grade online water-cooling wear-resistant steel plate resistant to low-temperature impact at-40 ℃ and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115537655A (en) * | 2022-09-16 | 2022-12-30 | 舞阳钢铁有限责任公司 | High-silicon wear-resistant steel plate and production method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115537655A (en) * | 2022-09-16 | 2022-12-30 | 舞阳钢铁有限责任公司 | High-silicon wear-resistant steel plate and production method thereof |
| CN115537655B (en) * | 2022-09-16 | 2023-08-22 | 舞阳钢铁有限责任公司 | High-silicon wear-resistant steel plate and production method thereof |
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