WO2023197572A1 - 一种500hb级以上的耐磨钢及其生产方法 - Google Patents

一种500hb级以上的耐磨钢及其生产方法 Download PDF

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WO2023197572A1
WO2023197572A1 PCT/CN2022/128866 CN2022128866W WO2023197572A1 WO 2023197572 A1 WO2023197572 A1 WO 2023197572A1 CN 2022128866 W CN2022128866 W CN 2022128866W WO 2023197572 A1 WO2023197572 A1 WO 2023197572A1
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grade
heating
steel
temperature
resistant steel
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French (fr)
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谯明亮
翟冬雨
杨柳
陈萌
马刘军
黄彪凯
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南京钢铁股份有限公司
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
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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
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    • 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
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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Definitions

  • the invention belongs to the field of metallurgical engineering, and specifically relates to a wear-resistant steel of grade 500HB or above and a production method thereof.
  • Wear-resistant steel is widely used in engineering machinery. Among them, the 500HB level requires surface Brinell hardness and longitudinal impact energy of -20 degrees. At the same time, due to the high hardness level requirements, the added carbonaceous alloy content is high, and the internal stress of the casting billet and steel plate increases. Cast slabs and steel plates will undergo brittle fracture during the cooling process from hot to cold, which brings great difficulties to production and manufacturing. The production of wear-resistant steel is technically difficult in the smelting and manufacturing process.
  • the first purpose of the present invention is to provide a wear-resistant steel above 500HB grade
  • the second purpose is to provide a production method of the above-mentioned wear-resistant steel.
  • the chemical composition and mass percentage of wear-resistant steel above 500HB grade disclosed by the present invention are as follows: C: 0.15% ⁇ 0.45%, Si: 0.15% ⁇ 0.50%, Mn: 0.50% ⁇ 1.80%, P ⁇ 0.015 %, S ⁇ 0.003%, V ⁇ 0.030%, Nb ⁇ 0.050%, Ti: 0.008% ⁇ 0.025%, Cr: 0.50% ⁇ 1.50%, Ni: ⁇ 1.00%, Mo: 0.20% ⁇ 0.80%, Al: 0.025 % ⁇ 0.055%, B: 0.0010% ⁇ 0.0050%, Mg: 0.0010% ⁇ 0.0018%, N ⁇ 0.0045%, the balance is Fe and inevitable impurities; the surface Brinell hardness of the steel grade is greater than or equal to 470HBW.
  • the chemical composition and mass percentage of 500HB grade wear-resistant steel are as follows: C: 0.15% ⁇ 0.35%, Si: 0.20% ⁇ 0.40%, Mn: 0.50% ⁇ 1.60%, P ⁇ 0.015%, S ⁇ 0.003%, V: 0.010% to 0.030%, Ti: 0.008% to 0.025%, Cr: 0.60% to 1.00%, Ni: 0.30% to 0.90%, Mo: 0.30% to 0.60%, Al: 0.025% to 0.055%, B: 0.0010% ⁇ 0.0030%, Mg: 0.0010% ⁇ 0.0018%, N ⁇ 0.0045%, the balance is Fe and inevitable impurities; the surface Brinell hardness of the steel grade is greater than or equal to 470HBW.
  • the chemical composition and mass percentage of 550HB grade wear-resistant steel are as follows: C: 0.16% ⁇ 0.36%, Si: 0.15% ⁇ 0.35%, Mn: 0.80% ⁇ 1.60%, P ⁇ 0.015%, S ⁇ 0.002%, Nb: 0.020 ⁇ 0.050%, Ti: 0.008% ⁇ 0.025%, Cr: 0.60% ⁇ 1.20%, Mo: 0.20 ⁇ 0.60%, Al: 0.025% ⁇ 0.055%, B: 0.0010% ⁇ 0.0050%, Mg: 0.0010% ⁇ 0.0018%, N ⁇ 0.0045%, the balance is Fe and inevitable impurities; the steel grade surface Brinell hardness is greater than or equal to 530HBW.
  • the chemical composition and mass percentage of 600HB grade wear-resistant steel are as follows: C: 0.35% ⁇ 0.45%, Si: 0.20% ⁇ 0.50%, Mn: 0.50% ⁇ 1.80%, P ⁇ 0.013%, S ⁇ 0.002%, Ti: 0.008% to 0.025%, Cr: 0.50% to 1.50%, Ni: 0.30% to 1.00%, Mo: 0.20% to 0.80%, Al: 0.025% to 0.055%, B: 0.0010% to 0.0050%, Mg: 0.0010% ⁇ 0.0018%, N ⁇ 0.0045%, the balance is Fe and inevitable impurities; the surface Brinell hardness of the steel grade is greater than or equal to 570HBW.
  • the above-mentioned production method of wear-resistant steel above grade 500HB includes the following steps:
  • the desulfurized molten iron is smelted in the smelting furnace, deoxidized and alloyed by LF and sent to RH for vacuum treatment.
  • the vacuum degree is ⁇ 3.0mbar. After meeting the vacuum degree requirements, the vacuum treatment time is 20 to 25 minutes. After the vacuum is completed, the magnesium aluminum wire is used for magnesium treatment. , simmer in the magnesium aluminum wire with a length of 200 ⁇ 220m, and stir for 15 ⁇ 25 minutes after the magnesium treatment is completed;
  • the casting speed is 0.6 ⁇ 1.3m/min, the superheat degree is 10 ⁇ 20°C, full protection casting is adopted, and the dynamic light reduction process is adopted.
  • the casting billet needs to be thermally inspected and left to warm. grinding; grinding
  • the casting billet is kept at a temperature of 150 ⁇ 450°C and entered into the furnace.
  • the heating process of the heating furnace is: the furnace temperature is 450 ⁇ 600°C, the heating speed is 10 ⁇ 15°C/min, and the heating speed at 600 ⁇ 1000°C is 5 ⁇ 7°C. /min, the heating speed from 1000 to 1100°C is 2°C/min, keep at 1100°C for 20 minutes, then exit the heating furnace, and use the TMCP rolling process for rolling;
  • the rolled steel plate is sent to heat treatment for quenching and tempering.
  • the primary quenching temperature is set to the heating temperature of 910 ⁇ 930°C, holding for 30 ⁇ 50min, and water cooling;
  • the secondary quenching temperature is set to the heating temperature of 860 ⁇ 880°C and holding. 25 ⁇ 30min, water cooling; tempering heating temperature 250 ⁇ 260°C, heat preservation 50 ⁇ 60min, air cooling;
  • the present invention formulates the composition of steel grade NM500 ⁇ NM600 wear-resistant steel according to the national "GB/T 24186-2009 High-Strength Wear-Resistant Steel Plate for Engineering Machinery” standard, and obtains wear-resistant steel performance indicators that meet the requirements of national standards.
  • the present invention uses magnesium metallurgy to treat molten steel cleanliness, improves the inclusion morphology, obtains refined magnesium oxide inclusions that are not easily ductile, and avoids the probability of intergranular cracks;
  • the present invention adopts titanium-molybdenum alloy element design, which can form titanium carbonitride.
  • adding aluminum element can effectively reduce the boron element compound, increase the free boron element of the steel, improve the hardenability of the steel, and facilitate martensite.
  • the formation of bulk structure increases the hardness of the steel surface matrix and improves product performance;
  • the secondary quenching process is adopted to solve the problem of intergranular cracking of high-strength steel plates during the heat treatment process and steel plate cooling process, ensuring the quality of the product;
  • Figure 1 is a metallographic structure diagram of Embodiment 1 of the present invention.
  • Figure 2 is a metallographic structure diagram of Embodiment 2 of the present invention.
  • Figure 3 is a metallographic structure diagram of Embodiment 3 of the present invention.
  • Figure 4 is a metallographic structure diagram of Embodiment 4 of the present invention.
  • Figure 5 is a metallographic structure diagram of Example 5 of the present invention.
  • Figure 6 is a metallographic structure diagram of Embodiment 6 of the present invention.
  • Figure 7 is a metallographic structure diagram of Embodiment 7 of the present invention.
  • Figure 8 is a metallographic structure diagram of Embodiment 8 of the present invention.
  • Figure 9 is a metallographic structure diagram of Example 9 of the present invention.
  • the above-mentioned production method of 500HB grade wear-resistant steel includes the following steps:
  • the desulfurized molten iron is smelted in the smelting furnace, deoxidized and alloyed by LF and sent to RH for vacuum treatment.
  • the vacuum degree is ⁇ 3.0mbar.
  • the vacuum treatment time is 20 minutes after meeting the vacuum degree requirements.
  • the magnesium aluminum wire is magnesium treated and simmered. Add a length of 200m to the magnesium-aluminum wire, and stir for 15 minutes after the magnesium treatment is completed;
  • the molten steel After the molten steel is refining, it is sent to continuous casting for casting.
  • the casting speed is 0.6m/min, the superheat degree is 1°C, fully protected casting is adopted, and the dynamic light reduction process is adopted.
  • the cast slab needs thermal inspection and grinding while waiting for temperature;
  • the casting billet is kept at 150°C and entered into the furnace.
  • the heating process of the heating furnace is: the entering furnace temperature is 450°C and the heating rate is 10°C/min, the heating rate at 600°C is 5°C/min, and the heating rate at 1000°C is 2°C. /min, keep at 1100°C for 20 minutes, then exit the heating furnace, and use TMCP rolling process for rolling;
  • the rolled steel plate is sent to heat treatment for quenching and tempering.
  • the primary quenching temperature is set to the heating temperature of 910°C, held for 30 minutes, and water-cooled; the secondary quenching temperature is set to the heating temperature of 860°C, held for 25 minutes, and water-cooled; tempered. Heating temperature 250°C, heat preservation 50min, air cooling;
  • the above-mentioned production method of 500HB grade wear-resistant steel includes the following steps:
  • the desulfurized molten iron is smelted in the smelting furnace, deoxidized and alloyed by LF and then sent to RH for vacuum treatment.
  • the vacuum degree is ⁇ 3.0mbar.
  • the vacuum treatment time is 22 minutes.
  • the magnesium aluminum wire is magnesium treated and simmered.
  • the length of the magnesium aluminum wire added is 210m, and the magnesium treatment is completed and stirred for 20 minutes;
  • the cast slab is kept at a temperature of 300°C and entered into the furnace.
  • the heating process of the heating furnace is: the entering furnace temperature is 520°C, the heating rate is 12°C/min, the heating rate at 800°C is 6°C/min, and the heating rate at 1050°C is 2°C. /min, keep at 1100°C for 20 minutes, then exit the heating furnace, and use TMCP rolling process for rolling;
  • the rolled steel plate is sent to heat treatment for quenching and tempering.
  • the initial quenching temperature is set to the heating temperature of 920°C, held for 40 minutes, and water-cooled; the secondary quenching temperature is set to the heating temperature of 870°C, held for 28 minutes, and water-cooled; tempered. Heating temperature 255°C, heat preservation 55min, air cooling;
  • the above-mentioned production method of 500HB grade wear-resistant steel includes the following steps:
  • the desulfurized molten iron is smelted in the smelting furnace, deoxidized and alloyed by LF and sent to RH for vacuum treatment.
  • the vacuum degree is ⁇ 3.0mbar.
  • the vacuum treatment time is 25 minutes.
  • the magnesium aluminum wire is magnesium treated and simmered.
  • the length of the magnesium aluminum wire added is 220m, and after the magnesium treatment is completed, stir quietly for 25 minutes;
  • the molten steel After the molten steel is refining, it is sent to continuous casting for casting.
  • the casting speed is 1.3m/min, the superheat degree is 20°C, fully protected casting is adopted, and the dynamic light reduction process is adopted.
  • the cast slab needs thermal inspection and grinding while waiting for temperature;
  • the cast slab is kept at 450°C and entered into the furnace.
  • the heating process of the heating furnace is: the entering furnace temperature is 600°C, the heating rate is 15°C/min, the heating rate at 1000°C is 7°C/min, and the heating rate at 1100°C is 2°C. /min, keep at 1100°C for 20 minutes, then exit the heating furnace, and use TMCP rolling process for rolling;
  • the rolled steel plate is sent to heat treatment for quenching and tempering.
  • the initial quenching temperature is set to the heating temperature of 930°C, held for 50 minutes, and water-cooled; the secondary quenching temperature is set to the heating temperature of 880°C, held for 30 minutes, and water-cooled; tempered. Heating temperature 260°C, heat preservation 60min, air cooling;
  • the above-mentioned production method of 550HB grade wear-resistant steel includes the following steps:
  • the desulfurized molten iron is smelted in the smelting furnace, deoxidized and alloyed by LF and sent to RH for vacuum treatment.
  • the vacuum degree is ⁇ 3.0mbar.
  • the vacuum treatment time is 20 minutes after meeting the vacuum degree requirements.
  • the magnesium aluminum wire is magnesium treated and simmered. Add a length of 200m to the magnesium-aluminum wire, and stir for 15 minutes after the magnesium treatment is completed;
  • the molten steel After the molten steel is refining, it is sent to continuous casting for casting.
  • the casting speed is 0.6m/min, the superheat degree is 1°C, fully protected casting is adopted, and the dynamic light reduction process is adopted.
  • the cast slab needs thermal inspection and grinding while waiting for temperature;
  • the casting billet is kept at 150°C and entered into the furnace.
  • the heating process of the heating furnace is: the entering furnace temperature is 450°C and the heating rate is 10°C/min, the heating rate at 600°C is 5°C/min, and the heating rate at 1000°C is 2°C. /min, keep at 1100°C for 20 minutes, then exit the heating furnace, and use TMCP rolling process for rolling;
  • the rolled steel plate is sent to heat treatment for quenching and tempering.
  • the primary quenching temperature is set to the heating temperature of 910°C, held for 30 minutes, and water-cooled; the secondary quenching temperature is set to the heating temperature of 860°C, held for 25 minutes, and water-cooled; tempered. Heating temperature 250°C, heat preservation 50min, air cooling;
  • the above-mentioned production method of 550HB grade wear-resistant steel includes the following steps:
  • the desulfurized molten iron is smelted in the smelting furnace, deoxidized and alloyed by LF and then sent to RH for vacuum treatment.
  • the vacuum degree is ⁇ 3.0mbar.
  • the vacuum treatment time is 22 minutes.
  • the magnesium aluminum wire is magnesium treated and simmered.
  • the length of the magnesium aluminum wire added is 210m, and the magnesium treatment is completed and stirred for 20 minutes;
  • the cast slab is kept at a temperature of 300°C and entered into the furnace.
  • the heating process of the heating furnace is: the entering furnace temperature is 520°C, the heating rate is 12°C/min, the heating rate at 800°C is 6°C/min, and the heating rate at 1050°C is 2°C. /min, keep at 1100°C for 20 minutes, then exit the heating furnace, and use TMCP rolling process for rolling;
  • the rolled steel plate is sent to heat treatment for quenching and tempering.
  • the initial quenching temperature is set to the heating temperature of 920°C, held for 40 minutes, and water-cooled; the secondary quenching temperature is set to the heating temperature of 870°C, held for 28 minutes, and water-cooled; tempered. Heating temperature 255°C, heat preservation 55min, air cooling;
  • the above-mentioned production method of 550HB grade wear-resistant steel includes the following steps:
  • the desulfurized molten iron is smelted in the smelting furnace, deoxidized and alloyed by LF and sent to RH for vacuum treatment.
  • the vacuum degree is ⁇ 3.0mbar.
  • the vacuum treatment time is 25 minutes.
  • the magnesium aluminum wire is magnesium treated and simmered.
  • the length of the magnesium aluminum wire added is 220m, and after the magnesium treatment is completed, stir quietly for 25 minutes;
  • the molten steel After the molten steel is refining, it is sent to continuous casting for casting.
  • the casting speed is 1.3m/min, the superheat degree is 20°C, fully protected casting is adopted, and the dynamic light reduction process is adopted.
  • the cast slab needs thermal inspection and grinding while waiting for temperature;
  • the cast slab is kept at 450°C and entered into the furnace.
  • the heating process of the heating furnace is: the entering furnace temperature is 600°C, the heating rate is 15°C/min, the heating rate at 1000°C is 7°C/min, and the heating rate at 1100°C is 2°C. /min, keep at 1100°C for 20 minutes, then exit the heating furnace, and use TMCP rolling process for rolling;
  • the rolled steel plate is sent to heat treatment for quenching and tempering.
  • the initial quenching temperature is set to the heating temperature of 930°C, held for 50 minutes, and water-cooled; the secondary quenching temperature is set to the heating temperature of 880°C, held for 30 minutes, and water-cooled; tempered. Heating temperature 260°C, heat preservation 60min, air cooling;
  • the above-mentioned production method of 600HB grade wear-resistant steel includes the following steps:
  • the desulfurized molten iron is smelted in the smelting furnace, deoxidized and alloyed by LF and sent to RH for vacuum treatment.
  • the vacuum degree is ⁇ 3.0mbar.
  • the vacuum treatment time is 20 minutes after meeting the vacuum degree requirements.
  • the magnesium aluminum wire is magnesium treated and simmered. Add a length of 200m to the magnesium-aluminum wire, and stir for 15 minutes after the magnesium treatment is completed;
  • the molten steel After the molten steel is refining, it is sent to continuous casting for casting.
  • the casting speed is 0.6m/min, the superheat degree is 1°C, fully protected casting is adopted, and the dynamic light reduction process is adopted.
  • the cast slab needs thermal inspection and grinding while waiting for temperature;
  • the casting billet is kept at 150°C and entered into the furnace.
  • the heating process of the heating furnace is: the entering temperature is 450°C and the heating rate is 10°C/min.
  • the heating rate at 600°C is 5°C/min.
  • the heating rate at 1000°C is 2°C. /min, keep at 1100°C for 20 minutes, then exit the heating furnace, and use TMCP rolling process for rolling;
  • the rolled steel plate is sent to heat treatment for quenching and tempering.
  • the primary quenching temperature is set to the heating temperature of 910°C, held for 30 minutes, and water-cooled; the secondary quenching temperature is set to the heating temperature of 860°C, held for 25 minutes, and water-cooled; tempered. Heating temperature 250°C, heat preservation 50min, air cooling;
  • the above-mentioned production method of 600HB grade wear-resistant steel includes the following steps:
  • the desulfurized molten iron is smelted in the smelting furnace, deoxidized and alloyed by LF and then sent to RH for vacuum treatment.
  • the vacuum degree is ⁇ 3.0mbar.
  • the vacuum treatment time is 22 minutes.
  • the magnesium aluminum wire is magnesium treated and simmered.
  • the length of the magnesium aluminum wire added is 210m, and the magnesium treatment is completed and stirred for 20 minutes;
  • the cast slab is kept at a temperature of 300°C and entered into the furnace.
  • the heating process of the heating furnace is: the entering furnace temperature is 520°C, the heating rate is 12°C/min, the heating rate at 800°C is 6°C/min, and the heating rate at 1050°C is 2°C. /min, keep at 1100°C for 20 minutes, then exit the heating furnace, and use TMCP rolling process for rolling;
  • the rolled steel plate is sent to heat treatment for quenching and tempering.
  • the initial quenching temperature is set to the heating temperature of 920°C, held for 40 minutes, and water-cooled; the secondary quenching temperature is set to the heating temperature of 870°C, held for 28 minutes, and water-cooled; tempered. Heating temperature 255°C, heat preservation 55min, air cooling;
  • a 600HB grade wear-resistant steel with the following chemical composition and mass percentage: C: 0.45%, Si: 0.50%, Mn: 1.80%, P: 0.013%, S: 0.002%, Ti: 0.025%, Cr: 1.50% , Ni: 1.00%, Mo: 0.80%, Al: 0.055%, B: 0.0050%, Mg: 0.0018%, N: 0.0045%, the balance is Fe and inevitable impurities; the steel grade surface Brinell hardness is greater than or equal to 570HBW .
  • the above-mentioned production method of 600HB grade wear-resistant steel includes the following steps:
  • the desulfurized molten iron is smelted in the smelting furnace, deoxidized and alloyed by LF and sent to RH for vacuum treatment.
  • the vacuum degree is ⁇ 3.0mbar.
  • the vacuum treatment time is 25 minutes.
  • the magnesium aluminum wire is magnesium treated and simmered.
  • the length of the magnesium aluminum wire added is 220m, and after the magnesium treatment is completed, stir quietly for 25 minutes;
  • the molten steel After the molten steel is refining, it is sent to continuous casting for casting.
  • the casting speed is 1.3m/min, the superheat degree is 20°C, fully protected casting is adopted, and the dynamic light reduction process is adopted.
  • the cast slab needs thermal inspection and grinding while waiting for temperature;
  • the cast slab is kept at 450°C and entered into the furnace.
  • the heating process of the heating furnace is: the entering furnace temperature is 600°C, the heating rate is 15°C/min, the heating rate at 1000°C is 7°C/min, and the heating rate at 1100°C is 2°C. /min, keep at 1100°C for 20 minutes, then exit the heating furnace, and use TMCP rolling process for rolling;
  • the rolled steel plate is sent to heat treatment for quenching and tempering.
  • the initial quenching temperature is set to the heating temperature of 930°C, held for 50 minutes, and water-cooled; the secondary quenching temperature is set to the heating temperature of 880°C, held for 30 minutes, and water-cooled; tempered. Heating temperature 260°C, heat preservation 60min, air cooling;

Abstract

本发明公开了一种500HB级以上的耐磨钢，其化学成分及质量百分比如下：C：0.15％～0.45％，Si：0.15％～0.50％，Mn：0.50％～1.80％，P≤0.015％，S≤0.003％，V≤0.030％，Nb≤0.050％，Ti：0.008％～0.025％，Cr：0.50％～1.50％，Ni:≤1.00％，Mo:0.20％～0.80％，Al：0.025％～0.055％，B：0.0010％～0.0050％，Mg：0.0010％～0.0018％，N≤0.0045％，余量为Fe和不可避免的杂质；钢级表面布氏硬度大于等于470HBW；还公开了该耐磨钢的生产方法。本发明根据国家"GB/T 24186-2009工程机械用高强度耐磨钢板"标准制定了钢级NM500～NM600级别耐磨钢成分，获得了满足国家标准要求的耐磨钢性能指标。

Description

一种500HB级以上的耐磨钢及其生产方法 技术领域
本发明属于冶金工程领域，具体涉及一种500HB级以上的耐磨钢及其生产方法。
背景技术
耐磨钢广泛应用于工程机械，其中500HB级别要求表面布氏硬度及纵向-20度冲击功，同时因为硬度级别要求高，所添加的碳质合金含量高，铸坯及钢板的内应力增加，铸坯及钢板在由热态降温至冷态的过程中会发生脆性断裂，给生产制造带来很大的困难，耐磨钢生产在冶炼制造过程中技术难度大。
发明内容
发明目的：本发明第一目的是提供一种500HB级以上的耐磨钢，第二目的是提供上述耐磨钢的生产方法。
技术方案：本发明公开的500HB级以上的耐磨钢，其化学成分及质量百分比如下：C：0.15％～0.45％，Si：0.15％～0.50％，Mn：0.50％～1.80％，P≤0.015％，S≤0.003％，V≤0.030％，Nb≤0.050％，Ti：0.008％～0.025％，Cr：0.50％～1.50％，Ni:≤1.00％，Mo:0.20％～0.80％，Al：0.025％～0.055％，B：0.0010％～0.0050％，Mg：0.0010％～0.0018％，N≤0.0045％，余量为Fe和不可避免的杂质；钢级表面布氏硬度大于等于470HBW。
进一步的，500HB级耐磨钢的化学成分及质量百分比如下：C：0.15％～0.35％，Si：0.20％～0.40％，Mn：0.50％～1.60％，P≤0.015％，S≤0.003％，V：0.010％～0.030％，Ti：0.008％～0.025％，Cr：0.60％～1.00％，Ni:0.30％～0.90％，Mo:0.30％～0.60％，Al：0.025％～0.055％，B：0.0010％～0.0030％，Mg：0.0010％～0.0018％，N≤0.0045％，余量为Fe和不可避免的杂质；钢级表面布氏硬度大于等于470HBW。
进一步的，550HB级耐磨钢的化学成分及质量百分比如下：C：0.16％～0.36％，Si：0.15％～0.35％，Mn：0.80％～1.60％，P≤0.015％，S≤0.002％，Nb：0.020～0.050％，Ti：0.008％～0.025％，Cr：0.60％～1.20％，Mo：0.20～0.60％，Al：0.025％～0.055％，B：0.0010％～0.0050％，Mg：0.0010％～0.0018％，N≤0.0045％，余量为Fe和不可避免的杂质；钢级表面布氏硬度大于等于530HBW。
进一步的，600HB级耐磨钢的化学成分及质量百分比如下：C：0.35％～0.45％，Si：0.20％～0.50％，Mn：0.50％～1.80％，P≤0.013％，S≤0.002％，Ti：0.008％～0.025％，Cr：0.50％～1.50％，Ni:0.30％～1.00％，Mo:0.20％～0.80％，Al：0.025％～0.055％，B：0.0010％～0.0050％，Mg：0.0010％～0.0018％，N≤0.0045％，余量为Fe和不可避免的杂质；钢级表面布氏硬度大于等于570HBW。
上述的500HB级以上的耐磨钢的生产方法，包括以下步骤：
S1、脱硫后的铁水经冶炼炉冶炼、LF脱氧合金化后送至RH真空处理，真空度≤3.0mbar，满足真空度要求后真空处理时间20～25min，真空结束后进行镁铝线进行镁处理，煨入镁铝线长度200～220m，镁处理结束后静搅15～25min；
S2、钢水精炼处理结束后送至连铸进行浇铸，浇铸速度0.6～1.3m/min，过热度10～20℃，采用全保护浇铸，采用动态轻压下工艺，铸坯需要热检及待温修磨；
S3、铸坯热检后保持温度150～450℃入炉，加热炉加热过程为：入炉温度450～600℃加热速度为10～15℃/min，600～1000℃加热速度为5～7℃/min，1000～1100℃加热速度为2℃/min，1100℃保温20min后出加热炉，采用TMCP轧制工艺进行轧制；
S4、轧制后的钢板送至热处理进行调质处理，初次淬火温度设定为加热温度910～930℃，保温30～50min，水冷；二次淬火温度设定为加热温度860～880℃，保温25～30min，水冷；回火加热温度250～260℃，保温50～60min，空冷；
S5、调质后用电子加热垫将钢板加热到120～150℃，出炉用燃烧枪进行切割，起刀速度160～200mm/min，切割速度350～380mm/min，切割完成后，盖上耐火保温棉缓慢冷却到室温，以消除切割产生的应力。
有益效果：相对于现有技术：
1、本发明根据国家“GB/T 24186-2009工程机械用高强度耐磨钢板”标准制定了钢级NM500～NM600级别耐磨钢成分，获得了满足国家标准要求的耐磨钢性能指标。
2、本发明采用镁冶金进行钢水洁净度处理，改善了夹杂物形态，获得了细化不易延展的氧化镁夹杂物，避免了晶间裂纹发生概率；
3、本发明采用了钛钼合金元素设计，可以形成碳氮化钛，同时添加铝元素，可以有效减少硼元素的化合物，增加钢种游离的硼元素，提高钢的淬透性，利于马氏体组织的形成，提高钢表面基体的硬度，提高产品的性能；
4、采用了二次淬火工艺，解决了高强度钢板在热处理过程及钢板冷却过程的晶间开裂问题，保证了产品的质量；
5、钢板切记工艺解决了钢板内应力大的问题，保证了钢板具有良好的表面质量与内部质量。
附图说明
图1为本发明实施例1的金相组织图；
图2为本发明实施例2的金相组织图；
图3为本发明实施例3的金相组织图；
图4为本发明实施例4的金相组织图；
图5为本发明实施例5的金相组织图；
图6为本发明实施例6的金相组织图；
图7为本发明实施例7的金相组织图；
图8为本发明实施例8的金相组织图；
图9为本发明实施例9的金相组织图。
具体实施方式
下面结合附图和实施例对本发明做进一步描述。
实施例1
一种500HB级耐磨钢，其化学成分及质量百分比如下：C：0.15％，Si：0.20％，Mn：0.50％，P：0.005％，S：0.001％，V：0.010％，Ti：0.008％，Cr：0.60％，Ni:0.30％，Mo:0.30％，Al：0.025％，B：0.0010％，Mg：0.0010％，N：0.0015％，余量为Fe和不可避免的杂质；钢级表面布氏硬度大于等于470HBW。
上述的500HB级耐磨钢的生产方法，包括以下步骤：
S1、脱硫后的铁水经冶炼炉冶炼、LF脱氧合金化后送至RH真空处理，真空度≤3.0mbar，满足真空度要求后真空处理时间20min，真空结束后进行镁铝线进行镁处理，煨入镁铝线长度200m，镁处理结束后静搅15min；
S2、钢水精炼处理结束后送至连铸进行浇铸，浇铸速度0.6m/min，过热度1℃，采用全保护浇铸，采用动态轻压下工艺，铸坯需要热检及待温修磨；
S3、铸坯热检后保持温度150℃入炉，加热炉加热过程为：入炉温度450℃加热速度为10℃/min，600℃加热速度为5℃/min，1000℃加热速度为2℃/min，1100℃保温20min后出加热炉，采用TMCP轧制工艺进行轧制；
S4、轧制后的钢板送至热处理进行调质处理，初次淬火温度设定为加热温度910℃，保温30min，水冷；二次淬火温度设定为加热温度860℃，保温25min，水冷；回火加热温度250℃，保温50min，空冷；
S5、调质后用电子加热垫将钢板加热到120℃，出炉用燃烧枪进行切割，起刀速度160mm/min，切割速度350mm/min，切割完成后，盖上耐火保温棉缓慢冷却到室温，以消除切割产生的应力。
所得金相组织图如图1所示，其性能参数如下：
Figure PCTCN2022128866-appb-000001
实施例2
一种500HB级耐磨钢，其化学成分及质量百分比如下：C：0.25％，Si：0.30％，Mn：1.00％，P：0.010％，S：0.002％，V：0.020％，Ti：0.016％，Cr：0.80％，Ni:0.60％，Mo:0.45％，Al：0.040％，B：0.0020％，Mg：0.0014％，N：0.0030％，余量为Fe和不可避免的杂质；钢级表面布氏硬度大于等于470HBW。
上述的500HB级耐磨钢的生产方法，包括以下步骤：
S1、脱硫后的铁水经冶炼炉冶炼、LF脱氧合金化后送至RH真空处理，真空度≤3.0mbar，满足真空度要求后真空处理时间22min，真空结束后进行镁铝线进行镁处理，煨入镁铝线长度210m，镁处理结束后静搅20min；
S2、钢水精炼处理结束后送至连铸进行浇铸，浇铸速度1.0m/min，过热度15℃，采用全保护浇铸，采用动态轻压下工艺，铸坯需要热检及待温修磨；
S3、铸坯热检后保持温度300℃入炉，加热炉加热过程为：入炉温度520℃加热速度为12℃/min，800℃加热速度为6℃/min，1050℃加热速度为2℃/min，1100℃保温20min后出加热炉，采用TMCP轧制工艺进行轧制；
S4、轧制后的钢板送至热处理进行调质处理，初次淬火温度设定为加热温度920℃，保温40min，水冷；二次淬火温度设定为加热温度870℃，保温28min，水冷；回火加热温度255℃，保温55min，空冷；
S5、调质后用电子加热垫将钢板加热到135℃，出炉用燃烧枪进行切割，起刀速度180mm/min，切割速度365mm/min，切割完成后，盖上耐火保温棉缓慢冷却到室温，以消除切割产生的应力。
所得金相组织图如图2所示，其性能参数如下：
Figure PCTCN2022128866-appb-000002
实施例3
一种500HB级耐磨钢，其化学成分及质量百分比如下：C：0.35％，Si：0.40％，Mn：1.60％，P：0.015％，S：0.003％，V：0.030％，Ti：0.025％，Cr：1.00％，Ni:0.90％，Mo:0.60％，Al：0.055％，B：0.0030％，Mg：0.0018％，N：0.0045％，余量为Fe和不可避免的杂质；钢级表面布氏硬度大于等于470HBW。
上述的500HB级耐磨钢的生产方法，包括以下步骤：
S1、脱硫后的铁水经冶炼炉冶炼、LF脱氧合金化后送至RH真空处理，真空度≤3.0mbar，满足真空度要求后真空处理时间25min，真空结束后进行镁铝线进行镁处理，煨入镁铝线长度220m，镁处理结束后静搅25min；
S2、钢水精炼处理结束后送至连铸进行浇铸，浇铸速度1.3m/min，过热度20℃，采用全保护浇铸，采用动态轻压下工艺，铸坯需要热检及待温修磨；
S3、铸坯热检后保持温度450℃入炉，加热炉加热过程为：入炉温度600℃加热速度为15℃/min，1000℃加热速度为7℃/min，1100℃加热速度为2℃/min，1100℃保温20min后出加热炉，采用TMCP轧制工艺进行轧制；
S4、轧制后的钢板送至热处理进行调质处理，初次淬火温度设定为加热温度930℃，保温50min，水冷；二次淬火温度设定为加热温度880℃，保温30min，水冷；回火加热温度260℃，保温60min，空冷；
S5、调质后用电子加热垫将钢板加热到150℃，出炉用燃烧枪进行切割，起刀速度200mm/min，切割速度380mm/min，切割完成后，盖上耐火保温棉缓慢冷却到室温，以消除切割产生的应力。
所得金相组织图如图3所示，其性能参数如下：
Figure PCTCN2022128866-appb-000003
实施例4
一种550HB级耐磨钢，其化学成分及质量百分比如下：C：0.16％，Si：0.15，Mn：0.80％，P：0.005％，S：0.0005％，Nb：0.020％，Ti：0.008％，Cr：0.60％，Mo：0.20％，Al：0.025％，B：0.0010％，Mg：0.0010％，N：0.0015％，余量为Fe和不可避免的杂质；钢级表面布氏硬度大于等于530HBW。
上述的550HB级耐磨钢的生产方法，包括以下步骤：
S1、脱硫后的铁水经冶炼炉冶炼、LF脱氧合金化后送至RH真空处理，真空度≤3.0mbar，满足真空度要求后真空处理时间20min，真空结束后进行镁铝线进行镁处理，煨入镁铝线长度200m，镁处理结束后静搅15min；
S2、钢水精炼处理结束后送至连铸进行浇铸，浇铸速度0.6m/min，过热度1℃，采用全保护浇铸，采用动态轻压下工艺，铸坯需要热检及待温修磨；
S3、铸坯热检后保持温度150℃入炉，加热炉加热过程为：入炉温度450℃加热速度为10℃/min，600℃加热速度为5℃/min，1000℃加热速度为2℃/min，1100℃保温20min后出加热炉，采用TMCP轧制工艺进行轧制；
S4、轧制后的钢板送至热处理进行调质处理，初次淬火温度设定为加热温度910℃，保温30min，水冷；二次淬火温度设定为加热温度860℃，保温25min，水冷；回火加热温度250℃，保温50min，空冷；
S5、调质后用电子加热垫将钢板加热到120℃，出炉用燃烧枪进行切割，起 刀速度160mm/min，切割速度350mm/min，切割完成后，盖上耐火保温棉缓慢冷却到室温，以消除切割产生的应力。
所得金相组织图如图4所示，其性能参数如下：
Figure PCTCN2022128866-appb-000004
实施例5
一种550HB级耐磨钢，其化学成分及质量百分比如下：C：0.26％，Si：0.25％，Mn：1.20％，P：0.010％，S：0.001％，Nb：0.035％，Ti：0.016％，Cr：0.90％，Mo：0.40％，Al：0.040％，B：0.0030％，Mg：0.0014％，N：0.0030％，余量为Fe和不可避免的杂质；钢级表面布氏硬度大于等于530HBW。
上述的550HB级耐磨钢的生产方法，包括以下步骤：
S1、脱硫后的铁水经冶炼炉冶炼、LF脱氧合金化后送至RH真空处理，真空度≤3.0mbar，满足真空度要求后真空处理时间22min，真空结束后进行镁铝线进行镁处理，煨入镁铝线长度210m，镁处理结束后静搅20min；
S2、钢水精炼处理结束后送至连铸进行浇铸，浇铸速度1.0m/min，过热度15℃，采用全保护浇铸，采用动态轻压下工艺，铸坯需要热检及待温修磨；
S3、铸坯热检后保持温度300℃入炉，加热炉加热过程为：入炉温度520℃加热速度为12℃/min，800℃加热速度为6℃/min，1050℃加热速度为2℃/min，1100℃保温20min后出加热炉，采用TMCP轧制工艺进行轧制；
S4、轧制后的钢板送至热处理进行调质处理，初次淬火温度设定为加热温度920℃，保温40min，水冷；二次淬火温度设定为加热温度870℃，保温28min，水冷；回火加热温度255℃，保温55min，空冷；
S5、调质后用电子加热垫将钢板加热到135℃，出炉用燃烧枪进行切割，起刀速度180mm/min，切割速度365mm/min，切割完成后，盖上耐火保温棉缓慢冷却到室温，以消除切割产生的应力。
所得金相组织图如图5所示，其性能参数如下：
Figure PCTCN2022128866-appb-000005
实施例6
一种550HB级耐磨钢，其化学成分及质量百分比如下：C：0.36％，Si：0.35％，Mn：1.60％，P：0.015％，S：0.002％，Nb：0.050％，Ti：0.025％，Cr：1.20％， Mo：0.60％，Al：0.055％，B：0.0050％，Mg：0.0018％，N：0.0045％，余量为Fe和不可避免的杂质；钢级表面布氏硬度大于等于530HBW。
上述的550HB级耐磨钢的生产方法，包括以下步骤：
S1、脱硫后的铁水经冶炼炉冶炼、LF脱氧合金化后送至RH真空处理，真空度≤3.0mbar，满足真空度要求后真空处理时间25min，真空结束后进行镁铝线进行镁处理，煨入镁铝线长度220m，镁处理结束后静搅25min；
S2、钢水精炼处理结束后送至连铸进行浇铸，浇铸速度1.3m/min，过热度20℃，采用全保护浇铸，采用动态轻压下工艺，铸坯需要热检及待温修磨；
S3、铸坯热检后保持温度450℃入炉，加热炉加热过程为：入炉温度600℃加热速度为15℃/min，1000℃加热速度为7℃/min，1100℃加热速度为2℃/min，1100℃保温20min后出加热炉，采用TMCP轧制工艺进行轧制；
S4、轧制后的钢板送至热处理进行调质处理，初次淬火温度设定为加热温度930℃，保温50min，水冷；二次淬火温度设定为加热温度880℃，保温30min，水冷；回火加热温度260℃，保温60min，空冷；
S5、调质后用电子加热垫将钢板加热到150℃，出炉用燃烧枪进行切割，起刀速度200mm/min，切割速度380mm/min，切割完成后，盖上耐火保温棉缓慢冷却到室温，以消除切割产生的应力。
所得金相组织图如图6所示，其性能参数如下：
Figure PCTCN2022128866-appb-000006
实施例7
一种600HB级耐磨钢，其化学成分及质量百分比如下：C：0.35％，Si：0.20％，Mn：0.50％，P：0.004％，S：0.0005％，Ti：0.008％，Cr：0.50％，Ni:0.30％，Mo:0.20％，Al：0.025％，B：0.0010％，Mg：0.0010％，N：0.0015％，余量为Fe和不可避免的杂质；钢级表面布氏硬度大于等于570HBW。
上述的600HB级耐磨钢的生产方法，包括以下步骤：
S1、脱硫后的铁水经冶炼炉冶炼、LF脱氧合金化后送至RH真空处理，真空度≤3.0mbar，满足真空度要求后真空处理时间20min，真空结束后进行镁铝线进行镁处理，煨入镁铝线长度200m，镁处理结束后静搅15min；
S2、钢水精炼处理结束后送至连铸进行浇铸，浇铸速度0.6m/min，过热度1℃，采用全保护浇铸，采用动态轻压下工艺，铸坯需要热检及待温修磨；
S3、铸坯热检后保持温度150℃入炉，加热炉加热过程为：入炉温度450℃ 加热速度为10℃/min，600℃加热速度为5℃/min，1000℃加热速度为2℃/min，1100℃保温20min后出加热炉，采用TMCP轧制工艺进行轧制；
S4、轧制后的钢板送至热处理进行调质处理，初次淬火温度设定为加热温度910℃，保温30min，水冷；二次淬火温度设定为加热温度860℃，保温25min，水冷；回火加热温度250℃，保温50min，空冷；
S5、调质后用电子加热垫将钢板加热到120℃，出炉用燃烧枪进行切割，起刀速度160mm/min，切割速度350mm/min，切割完成后，盖上耐火保温棉缓慢冷却到室温，以消除切割产生的应力。
所得金相组织图如图7所示，其性能参数如下：
Figure PCTCN2022128866-appb-000007
实施例8
一种600HB级耐磨钢，其化学成分及质量百分比如下：C：0.40％，Si：0.35％，Mn：1.00％，P：0.008％，S：0.001％，Ti：0.016％，Cr：1.00％，Ni:0.70％，Mo:0.50％，Al：0.040％，B：0.0030％，Mg：0.0014％，N：0.0030％，余量为Fe和不可避免的杂质；钢级表面布氏硬度大于等于570HBW。
上述的600HB级耐磨钢的生产方法，包括以下步骤：
S1、脱硫后的铁水经冶炼炉冶炼、LF脱氧合金化后送至RH真空处理，真空度≤3.0mbar，满足真空度要求后真空处理时间22min，真空结束后进行镁铝线进行镁处理，煨入镁铝线长度210m，镁处理结束后静搅20min；
S2、钢水精炼处理结束后送至连铸进行浇铸，浇铸速度1.0m/min，过热度15℃，采用全保护浇铸，采用动态轻压下工艺，铸坯需要热检及待温修磨；
S3、铸坯热检后保持温度300℃入炉，加热炉加热过程为：入炉温度520℃加热速度为12℃/min，800℃加热速度为6℃/min，1050℃加热速度为2℃/min，1100℃保温20min后出加热炉，采用TMCP轧制工艺进行轧制；
S4、轧制后的钢板送至热处理进行调质处理，初次淬火温度设定为加热温度920℃，保温40min，水冷；二次淬火温度设定为加热温度870℃，保温28min，水冷；回火加热温度255℃，保温55min，空冷；
S5、调质后用电子加热垫将钢板加热到135℃，出炉用燃烧枪进行切割，起刀速度180mm/min，切割速度365mm/min，切割完成后，盖上耐火保温棉缓慢冷却到室温，以消除切割产生的应力。
所得金相组织图如图8所示，其性能参数如下：
Figure PCTCN2022128866-appb-000008
实施例9
一种600HB级耐磨钢，其化学成分及质量百分比如下：C：0.45％，Si：0.50％，Mn：1.80％，P：0.013％，S：0.002％，Ti：0.025％，Cr：1.50％，Ni:1.00％，Mo:0.80％，Al：0.055％，B：0.0050％，Mg：0.0018％，N：0.0045％，余量为Fe和不可避免的杂质；钢级表面布氏硬度大于等于570HBW。
上述的600HB级耐磨钢的生产方法，包括以下步骤：
S1、脱硫后的铁水经冶炼炉冶炼、LF脱氧合金化后送至RH真空处理，真空度≤3.0mbar，满足真空度要求后真空处理时间25min，真空结束后进行镁铝线进行镁处理，煨入镁铝线长度220m，镁处理结束后静搅25min；
S2、钢水精炼处理结束后送至连铸进行浇铸，浇铸速度1.3m/min，过热度20℃，采用全保护浇铸，采用动态轻压下工艺，铸坯需要热检及待温修磨；
S3、铸坯热检后保持温度450℃入炉，加热炉加热过程为：入炉温度600℃加热速度为15℃/min，1000℃加热速度为7℃/min，1100℃加热速度为2℃/min，1100℃保温20min后出加热炉，采用TMCP轧制工艺进行轧制；
S4、轧制后的钢板送至热处理进行调质处理，初次淬火温度设定为加热温度930℃，保温50min，水冷；二次淬火温度设定为加热温度880℃，保温30min，水冷；回火加热温度260℃，保温60min，空冷；
S5、调质后用电子加热垫将钢板加热到150℃，出炉用燃烧枪进行切割，起刀速度200mm/min，切割速度380mm/min，切割完成后，盖上耐火保温棉缓慢冷却到室温，以消除切割产生的应力。
所得金相组织图如图9所示，其性能参数如下：
Figure PCTCN2022128866-appb-000009

Claims (5)

  1. 一种500HB级以上的耐磨钢，其特征在于，其化学成分及质量百分比如下：C：0.15％～0.45％，Si：0.15％～0.50％，Mn：0.50％～1.80％，P≤0.015％，S≤0.003％，V≤0.030％，Nb≤0.050％，Ti：0.008％～0.025％，Cr：0.50％～1.50％，Ni:≤1.00％，Mo:0.20％～0.80％，Al：0.025％～0.055％，B：0.0010％～0.0050％，Mg：0.0010％～0.0018％，N≤0.0045％，余量为Fe和不可避免的杂质；钢级表面布氏硬度大于等于470HBW。
  2. 根据权利要求1所述的500HB级以上的耐磨钢，其特征在于：500HB级耐磨钢的化学成分及质量百分比如下：C：0.15％～0.35％，Si：0.20％～0.40％，Mn：0.50％～1.60％，P≤0.015％，S≤0.003％，V：0.010％～0.030％，Ti：0.008％～0.025％，Cr：0.60％～1.00％，Ni:0.30％～0.90％，Mo:0.30％～0.60％，Al：0.025％～0.055％，B：0.0010％～0.0030％，Mg：0.0010％～0.0018％，N≤0.0045％，余量为Fe和不可避免的杂质；钢级表面布氏硬度大于等于470HBW。
  3. 根据权利要求1所述的500HB级以上的耐磨钢，其特征在于：550HB级耐磨钢的化学成分及质量百分比如下：C：0.16％～0.36％，Si：0.15％～0.35％，Mn：0.80％～1.60％，P≤0.015％，S≤0.002％，Nb：0.020～0.050％，Ti：0.008％～0.025％，Cr：0.60％～1.20％，Mo：0.20～0.60％，Al：0.025％～0.055％，B：0.0010％～0.0050％，Mg：0.0010％～0.0018％，N≤0.0045％，余量为Fe和不可避免的杂质；钢级表面布氏硬度大于等于530HBW。
  4. 根据权利要求1所述的500HB级以上的耐磨钢，其特征在于：600HB级耐磨钢的化学成分及质量百分比如下：C：0.35％～0.45％，Si：0.20％～0.50％，Mn：0.50％～1.80％，P≤0.013％，S≤0.002％，Ti：0.008％～0.025％，Cr：0.50％～1.50％，Ni:0.30％～1.00％，Mo:0.20％～0.80％，Al：0.025％～0.055％，B：0.0010％～0.0050％，Mg：0.0010％～0.0018％，N≤0.0045％，余量为Fe和不可避免的杂质；钢级表面布氏硬度大于等于570HBW。
  5. 权利要求1所述的500HB级以上的耐磨钢的生产方法，其特征在于，包括以下步骤：
    S1、脱硫后的铁水经冶炼炉冶炼、LF脱氧合金化后送至RH真空处理，真空度≤3.0mbar，满足真空度要求后真空处理时间20～25min，真空结束后进行镁铝线进行镁处理，煨入镁铝线长度200～220m，镁处理结束后静搅15～25min；
    S2、钢水精炼处理结束后送至连铸进行浇铸，浇铸速度0.6～1.3m/min，过热度10～20℃，采用全保护浇铸，采用动态轻压下工艺，铸坯需要热检及待温修磨；
    S3、铸坯热检后保持温度150～450℃入炉，加热炉加热过程为：入炉温度 450～600℃加热速度为10～15℃/min，600～1000℃加热速度为5～7℃/min，1000～1100℃加热速度为2℃/min，1100℃保温20min后出加热炉，采用TMCP轧制工艺进行轧制；
    S4、轧制后的钢板送至热处理进行调质处理，初次淬火温度设定为加热温度910～930℃，保温30～50min，水冷；二次淬火温度设定为加热温度860～880℃，保温25～30min，水冷；回火加热温度250～260℃，保温50～60min，空冷；
    S5、调质后用电子加热垫将钢板加热到120～150℃，出炉用燃烧枪进行切割，起刀速度160～200mm/min，切割速度350～380mm/min，切割完成后，盖上耐火保温棉缓慢冷却到室温，以消除切割产生的应力。
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