CN114672735A - Wear-resistant steel with grade of 500HB or above and production method thereof - Google Patents

Wear-resistant steel with grade of 500HB or above and production method thereof Download PDF

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CN114672735A
CN114672735A CN202210377101.5A CN202210377101A CN114672735A CN 114672735 A CN114672735 A CN 114672735A CN 202210377101 A CN202210377101 A CN 202210377101A CN 114672735 A CN114672735 A CN 114672735A
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heating
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resistant steel
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翟冬雨
杨柳
陈萌
马刘军
黄彪凯
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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Priority to PCT/CN2022/128866 priority patent/WO2023197572A1/en
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Abstract

The invention discloses wear-resistant steel with the grade of 500HB or above, which comprises the following chemical components in percentage by mass: c: 0.15% -0.45%, Si: 0.15-0.50%, Mn: 0.50-1.80%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, V is less than or equal to 0.030%, Nb is less than or equal to 0.050%, Ti: 0.008-0.025%, Cr: 0.50-1.50%, Ni is less than or equal to 1.00%, Mo is 0.20-0.80%, Al: 0.025% -0.055%, B: 0.0010-0.0050%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities; the Brinell hardness of the steel grade surface is greater than or equal to 470 HBW; also discloses a production method of the wear-resistant steel. According to the invention, the components of the steel-grade NM 500-NM 600-grade wear-resistant steel are formulated according to the national standard of GB/T24186-2009 high-strength wear-resistant steel plate for engineering machinery, and the performance index of the wear-resistant steel meeting the national standard requirement is obtained.

Description

Wear-resistant steel with grade of 500HB or above and production method thereof
Technical Field
The invention belongs to the field of metallurgical engineering, and particularly relates to wear-resistant steel with the grade of 500HB or above and a production method thereof.
Background
The wear-resistant steel is widely applied to engineering machinery, wherein the Brinell hardness of the surface and the longitudinal-20 ℃ impact energy are required at the level of 500HB, and simultaneously, because the hardness level is required to be high, the content of the added carbon alloy is high, the internal stress of a casting blank and a steel plate is increased, the casting blank and the steel plate can be subjected to brittle fracture in the process of cooling from a hot state to a cold state, great difficulty is brought to production and manufacturing, and the technical difficulty in the smelting and manufacturing process of the wear-resistant steel is great.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a wear-resistant steel with the grade of 500HB or above and a production method thereof.
The technical scheme is as follows: the invention discloses wear-resistant steel with the grade of 500HB or above, which comprises the following chemical components in percentage by mass: c: 0.15% -0.45%, Si: 0.15-0.50%, Mn: 0.50-1.80%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, V is less than or equal to 0.030%, Nb is less than or equal to 0.050%, Ti: 0.008-0.025%, Cr: 0.50-1.50%, Ni is less than or equal to 1.00%, Mo is 0.20-0.80%, Al: 0.025% -0.055%, B: 0.0010-0.0050%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities; the Brinell hardness of the steel grade surface is greater than or equal to 470 HBW.
Further, the 500 HB-grade wear-resistant steel comprises the following chemical components in percentage by mass: c: 0.15% -0.35%, Si: 0.20-0.40%, Mn: 0.50-1.60%, P is less than or equal to 0.015%, S is less than or equal to 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 to 0.0018 percent, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities; the Brinell hardness of the steel grade surface is greater than or equal to 470 HBW.
Further, the 550HB wear-resistant steel comprises the following chemical components in percentage by mass: c: 0.16% -0.36%, Si: 0.15-0.35%, Mn: 0.80-1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.002%, Nb: 0.020 to 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 to 0.0018 percent, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities; the Brinell hardness of the steel grade surface is greater than or equal to 530 HBW.
Further, the 600HB wear-resistant steel comprises the following chemical components in percentage by mass: c: 0.35-0.45%, Si: 0.20-0.50%, Mn: 0.50-1.80%, P is less than or equal to 0.013%, S is less than or equal to 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 to 0.0018 percent, less than or equal to 0.0045 percent of N, and the balance of Fe and inevitable impurities; the Brinell hardness of the steel grade surface is greater than or equal to 570 HBW.
The production method of the wear-resistant steel with the grade of 500HB or above comprises the following steps:
s1, smelting the desulfurized molten iron in a smelting furnace, performing LF deoxidation alloying, and then conveying to RH vacuum treatment, wherein the vacuum degree is less than or equal to 3.0mbar, the vacuum treatment time is 20-25 min after the vacuum degree requirement is met, performing magnesium treatment on a magnesium-aluminum wire after the vacuum is finished, roasting the magnesium-aluminum wire to the length of 200-220 m, and performing static stirring for 15-25 min after the magnesium treatment is finished;
s2, after the molten steel refining treatment is finished, the casting blank is sent to continuous casting for casting, the casting speed is 0.6-1.3 m/min, the superheat degree is 10-20 ℃, full-protection casting is adopted, a dynamic soft reduction process is adopted, and the casting blank needs thermal inspection and temperature-waiting coping;
s3, keeping the temperature of the casting blank to be 150-450 ℃ after thermal detection, and feeding the casting blank into a furnace, wherein the heating process of the heating furnace is as follows: the heating speed is 10-15 ℃/min at the charging temperature of 450-600 ℃, 5-7 ℃/min at the heating speed of 600-1000 ℃, 2 ℃/min at the heating speed of 1000-1100 ℃, and the temperature is kept at 1100 ℃ for 20min, and then the mixture is taken out of the heating furnace and rolled by adopting a TMCP rolling process;
s4, sending the rolled steel plate to heat treatment for quenching and tempering, setting the primary quenching temperature as 910-930 ℃, preserving heat for 30-50 min, and cooling with water; setting the secondary quenching temperature to be 860-880 ℃, preserving the heat for 25-30 min, and cooling by water; tempering and heating at 250-260 ℃, preserving heat for 50-60 min, and air cooling;
s5, heating the steel plate to 120-150 ℃ by using an electronic heating pad after tempering, discharging from the furnace, cutting by using a combustion gun at a cutter starting speed of 160-200 mm/min and a cutting speed of 350-380 mm/min, covering a fireproof heat-preservation cotton after cutting, and slowly cooling to room temperature to eliminate stress generated by cutting.
Has the advantages that: compared with the prior art:
1. according to the invention, the components of the steel-grade NM 500-NM 600-grade wear-resistant steel are formulated according to the national standard of GB/T24186-2009 high-strength wear-resistant steel plate for engineering machinery, and the performance index of the wear-resistant steel meeting the national standard requirement is obtained.
2. The invention adopts magnesium metallurgy to carry out molten steel cleanliness treatment, improves the shape of inclusions, obtains refined magnesium oxide inclusions which are difficult to extend, and avoids intergranular crack occurrence probability;
3. the titanium molybdenum alloy element design is adopted, titanium carbonitride can be formed, meanwhile, the aluminum element is added, the compounds of the boron element can be effectively reduced, the free boron element of the steel grade is increased, the hardenability of the steel is improved, the formation of a martensite structure is facilitated, the hardness of a steel surface matrix is improved, and the performance of a product is improved;
4. the secondary quenching process is adopted, so that the problem of intergranular cracking of the high-strength steel plate in the heat treatment process and the steel plate cooling process is solved, and the quality of the product is ensured;
5. the steel plate cutting process solves the problem of large internal stress of the steel plate, and ensures that the steel plate has good surface quality and internal quality.
Drawings
FIG. 1 is a metallographic structure diagram of the structure of example 1 of the present invention;
FIG. 2 is a metallographic structure diagram according to example 2 of the present invention;
FIG. 3 is a metallographic structure drawing according to example 3 of the present invention;
FIG. 4 is a metallographic structure chart according to example 4 of the present invention;
FIG. 5 is a metallographic structure chart of the sample according to example 5 of the present invention;
FIG. 6 is a metallographic structure chart obtained in example 6 of the present invention;
FIG. 7 is a metallographic structure chart according to example 7 of the present invention;
FIG. 8 is a metallographic structure chart according to example 8 of the present invention;
FIG. 9 is a metallographic structure chart of example 9 of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
Example 1
500 HB-grade wear-resistant steel comprises the following chemical components in percentage by mass: 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%, the balance being Fe and unavoidable impurities; the Brinell hardness of the steel grade surface is greater than or equal to 470 HBW.
The production method of the 500 HB-grade wear-resistant steel comprises the following steps:
s1, smelting the desulfurized molten iron in a smelting furnace, performing LF deoxidation alloying, and then conveying to RH vacuum treatment, wherein the vacuum degree is less than or equal to 3.0mbar, the vacuum treatment time is 20min after the vacuum degree requirement is met, magnesium treatment is performed on a magnesium-aluminum wire after the vacuum is finished, the length of the magnesium-aluminum wire is 200m after the magnesium treatment is finished, and static stirring is performed for 15min after the magnesium treatment is finished;
s2, after the molten steel refining treatment is finished, the casting blank is sent to continuous casting for casting, the casting speed is 0.6m/min, the superheat degree is 1 ℃, full-protection casting is adopted, a dynamic soft reduction process is adopted, and the casting blank needs thermal inspection and temperature-waiting coping;
s3, keeping the temperature of the casting blank to be 150 ℃ after thermal detection, and feeding the casting blank into a furnace, wherein the heating process of the heating furnace is as follows: the temperature of the furnace is 450 ℃, the heating speed is 10 ℃/min, the heating speed of 600 ℃ is 5 ℃/min, the heating speed of 1000 ℃ is 2 ℃/min, the temperature is maintained at 1100 ℃ for 20min, and then the product is taken out of the heating furnace and rolled by adopting a TMCP rolling process;
s4, sending the rolled steel plate to heat treatment for quenching and tempering, setting the primary quenching temperature as 910 ℃, preserving the heat for 30min, and cooling by water; setting the secondary quenching temperature as 860 ℃, preserving the heat for 25min, and cooling by water; tempering and heating at 250 ℃, preserving heat for 50min, and air cooling;
s5, heating the steel plate to 120 ℃ by using an electronic heating pad after tempering, discharging from the furnace, cutting by using a combustion gun, starting the cutter at a speed of 160mm/min and cutting at a speed of 350mm/min, covering refractory heat-insulating cotton after cutting, and slowly cooling to room temperature to eliminate stress generated by cutting.
The metallographic structure diagram obtained is shown in fig. 1, and the performance parameters are as follows:
Figure BDA0003591132290000031
example 2
500 HB-grade wear-resistant steel comprises the following chemical components in percentage by mass: 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%, the balance being Fe and unavoidable impurities; the Brinell hardness of the steel grade surface is greater than or equal to 470 HBW.
The production method of the 500 HB-grade wear-resistant steel comprises the following steps:
s1, smelting the desulfurized molten iron in a smelting furnace, performing LF deoxidation alloying, and then conveying to RH vacuum treatment, wherein the vacuum degree is less than or equal to 3.0mbar, the vacuum treatment time is 22min after the vacuum degree requirement is met, magnesium treatment is performed on a magnesium-aluminum wire after the vacuum is finished, the length of the magnesium-aluminum wire is 210m after the magnesium treatment is roasted, and the magnesium treatment is statically stirred for 20min after the magnesium treatment is finished;
s2, after the molten steel refining treatment is finished, the casting blank is sent to continuous casting for casting, the casting speed is 1.0m/min, the superheat degree is 15 ℃, full-protection casting is adopted, a dynamic soft reduction process is adopted, and the casting blank needs thermal inspection and temperature-waiting coping;
s3, keeping the temperature at 300 ℃ after the casting blank is subjected to thermal detection, and feeding into a furnace, wherein the heating process of the heating furnace is as follows: the heating speed of the furnace entering temperature of 520 ℃ is 12 ℃/min, the heating speed of 800 ℃ is 6 ℃/min, the heating speed of 1050 ℃ is 2 ℃/min, the temperature is maintained at 1100 ℃ for 20min, and then the steel is taken out of the heating furnace and rolled by adopting a TMCP rolling process;
s4, sending the rolled steel plate to heat treatment for quenching and tempering, setting the primary quenching temperature to be 920 ℃, preserving the heat for 40min, and cooling by water; setting the secondary quenching temperature as 870 ℃ of heating temperature, keeping the temperature for 28min, and cooling by water; tempering and heating at 255 ℃, preserving heat for 55min, and air cooling;
and S5, heating the steel plate to 135 ℃ by using an electronic heating pad after tempering, discharging from the furnace, cutting by using a combustion gun at a cutting starting speed of 180mm/min and a cutting speed of 365mm/min, covering refractory heat-insulating cotton after cutting, and slowly cooling to room temperature to eliminate stress generated by cutting.
The metallographic structure diagram obtained is shown in fig. 2, and the performance parameters are as follows:
Figure BDA0003591132290000041
example 3
500 HB-grade wear-resistant steel comprises the following chemical components in percentage by mass: 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%, the balance being Fe and unavoidable impurities; the Brinell hardness of the steel grade surface is greater than or equal to 470 HBW.
The production method of the 500 HB-grade wear-resistant steel comprises the following steps:
s1, smelting the desulfurized molten iron in a smelting furnace, performing LF deoxidation alloying, and then conveying to RH vacuum treatment, wherein the vacuum degree is less than or equal to 3.0mbar, the vacuum treatment time is 25min after the vacuum degree requirement is met, magnesium treatment is performed on a magnesium-aluminum wire after the vacuum is finished, the length of the magnesium-aluminum wire is roasted to be 220m, and the magnesium treatment is statically stirred for 25min after the magnesium treatment is finished;
s2, after finishing the molten steel refining treatment, sending the molten steel to continuous casting for casting, wherein the casting speed is 1.3m/min, the superheat degree is 20 ℃, full-protection casting is adopted, a dynamic soft reduction process is adopted, and the casting blank needs thermal inspection and temperature-waiting coping;
s3, keeping the temperature of the casting blank to be 450 ℃ after thermal detection, and feeding the casting blank into a furnace, wherein the heating process of the heating furnace is as follows: heating at 600 deg.C at 7 deg.C/min and 1000 deg.C at 2 deg.C/min at 1100 deg.C for 20min, taking out of the furnace, and rolling by TMCP rolling process;
s4, sending the rolled steel plate to heat treatment for quenching and tempering, setting the primary quenching temperature to be 930 ℃, preserving heat for 50min, and cooling by water; setting the secondary quenching temperature as 880 ℃, preserving the heat for 30min, and cooling by water; tempering and heating at 260 ℃, preserving heat for 60min, and air cooling;
s5, heating the steel plate to 150 ℃ by using an electronic heating pad after tempering, discharging from the furnace, cutting by using a combustion gun, starting the cutting at the speed of 200mm/min and cutting at the speed of 380mm/min, covering refractory heat-insulating cotton after cutting, and slowly cooling to room temperature to eliminate stress generated by cutting.
The metallographic structure obtained is shown in FIG. 3, and the performance parameters are as follows:
Figure BDA0003591132290000051
example 4
The 550 HB-grade wear-resistant steel comprises the following chemical components in percentage by mass: 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%, the balance being Fe and unavoidable impurities; the Brinell hardness of the steel grade surface is greater than or equal to 530 HBW.
The production method of the 550HB wear-resistant steel comprises the following steps:
s1, smelting the desulfurized molten iron in a smelting furnace, performing LF deoxidation alloying, and then conveying to RH vacuum treatment, wherein the vacuum degree is less than or equal to 3.0mbar, the vacuum treatment time is 20min after the vacuum degree requirement is met, performing magnesium treatment on a magnesium-aluminum wire after the vacuum is finished, roasting the magnesium-aluminum wire for 200m in length, and statically stirring for 15min after the magnesium treatment is finished;
s2, after the molten steel refining treatment is finished, the casting blank is sent to continuous casting for casting, the casting speed is 0.6m/min, the superheat degree is 1 ℃, full-protection casting is adopted, a dynamic soft reduction process is adopted, and the casting blank needs thermal inspection and temperature-waiting coping;
s3, keeping the temperature of the casting blank to be 150 ℃ after thermal detection, and feeding the casting blank into a furnace, wherein the heating process of the heating furnace is as follows: the temperature of the furnace is 450 ℃, the heating speed is 10 ℃/min, the heating speed of 600 ℃ is 5 ℃/min, the heating speed of 1000 ℃ is 2 ℃/min, the temperature is maintained at 1100 ℃ for 20min, and then the product is taken out of the heating furnace and rolled by adopting a TMCP rolling process;
s4, sending the rolled steel plate to heat treatment for quenching and tempering, setting the primary quenching temperature as 910 ℃, preserving the heat for 30min, and cooling by water; setting the secondary quenching temperature as 860 ℃, preserving the heat for 25min, and cooling by water; tempering and heating at 250 ℃, preserving heat for 50min, and air cooling;
s5, heating the steel plate to 120 ℃ by using an electronic heating pad after tempering, taking the steel plate out of the furnace, cutting by using a combustion gun at a cutter starting speed of 160mm/min and a cutting speed of 350mm/min, covering refractory heat-insulating cotton after cutting, and slowly cooling to room temperature to eliminate stress generated by cutting.
The metallographic structure diagram obtained is shown in fig. 4, and the performance parameters are as follows:
Figure BDA0003591132290000061
example 5
The 550 HB-grade wear-resistant steel comprises the following chemical components in percentage by mass: 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%, the balance being Fe and unavoidable impurities; the Brinell hardness of the steel grade surface is greater than or equal to 530 HBW.
The production method of the 550 HB-grade wear-resistant steel comprises the following steps:
s1, smelting the desulfurized molten iron in a smelting furnace, performing LF deoxidation alloying, and then conveying to RH vacuum treatment, wherein the vacuum degree is less than or equal to 3.0mbar, the vacuum treatment time is 22min after the vacuum degree requirement is met, magnesium treatment is performed on a magnesium-aluminum wire after the vacuum is finished, the length of the magnesium-aluminum wire is 210m after the magnesium treatment is roasted, and the magnesium treatment is statically stirred for 20min after the magnesium treatment is finished;
s2, after the molten steel refining treatment is finished, the casting blank is sent to continuous casting for casting, the casting speed is 1.0m/min, the superheat degree is 15 ℃, full-protection casting is adopted, a dynamic soft reduction process is adopted, and the casting blank needs thermal inspection and temperature-waiting coping;
s3, keeping the temperature at 300 ℃ after the casting blank is subjected to thermal detection, and feeding into a furnace, wherein the heating process of the heating furnace is as follows: the heating speed of the furnace entering temperature of 520 ℃ is 12 ℃/min, the heating speed of 800 ℃ is 6 ℃/min, the heating speed of 1050 ℃ is 2 ℃/min, the temperature is maintained at 1100 ℃ for 20min, and then the steel is taken out of the heating furnace and rolled by adopting a TMCP rolling process;
s4, sending the rolled steel plate to a heat treatment for quenching and tempering, setting the primary quenching temperature to be 920 ℃, preserving the heat for 40min, and cooling with water; setting the secondary quenching temperature as 870 ℃ of heating temperature, keeping the temperature for 28min, and cooling by water; tempering and heating at 255 ℃, preserving heat for 55min, and air cooling;
and S5, heating the steel plate to 135 ℃ by using an electronic heating pad after tempering, discharging from the furnace, cutting by using a combustion gun at a cutting starting speed of 180mm/min and a cutting speed of 365mm/min, covering refractory heat-insulating cotton after cutting, and slowly cooling to room temperature to eliminate stress generated by cutting.
The metallographic structure obtained is shown in fig. 5, and the performance parameters are as follows:
Figure BDA0003591132290000062
example 6
The 550 HB-grade wear-resistant steel comprises the following chemical components in percentage by mass: 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%, the balance being Fe and unavoidable impurities; the Brinell hardness of the steel grade surface is greater than or equal to 530 HBW.
The production method of the 550 HB-grade wear-resistant steel comprises the following steps:
s1, smelting the desulfurized molten iron in a smelting furnace, performing LF deoxidation alloying, and then conveying to RH vacuum treatment, wherein the vacuum degree is less than or equal to 3.0mbar, the vacuum treatment time is 25min after the vacuum degree requirement is met, magnesium treatment is performed on a magnesium-aluminum wire after the vacuum is finished, the length of the magnesium-aluminum wire is roasted to be 220m, and the magnesium treatment is statically stirred for 25min after the magnesium treatment is finished;
s2, after finishing the molten steel refining treatment, sending the molten steel to continuous casting for casting, wherein the casting speed is 1.3m/min, the superheat degree is 20 ℃, full-protection casting is adopted, a dynamic soft reduction process is adopted, and the casting blank needs thermal inspection and temperature-waiting coping;
s3, keeping the temperature of the casting blank to be 450 ℃ after thermal detection, and feeding the casting blank into a furnace, wherein the heating process of the heating furnace is as follows: heating at 600 deg.C at 15 deg.C/min, 1000 deg.C at 7 deg.C/min, 1100 deg.C at 2 deg.C/min, maintaining at 1100 deg.C for 20min, taking out of the heating furnace, and rolling by TMCP rolling process;
s4, sending the rolled steel plate to heat treatment for quenching and tempering, setting the primary quenching temperature to be 930 ℃, preserving heat for 50min, and cooling by water; setting the secondary quenching temperature as 880 ℃, preserving the heat for 30min, and cooling by water; tempering and heating at 260 ℃, preserving heat for 60min, and air cooling;
s5, heating the steel plate to 150 ℃ by using an electronic heating pad after tempering, discharging from the furnace, cutting by using a combustion gun, starting the cutting at the speed of 200mm/min and cutting at the speed of 380mm/min, covering refractory heat-insulating cotton after cutting, and slowly cooling to room temperature to eliminate stress generated by cutting.
The metallographic structure obtained is shown in fig. 6, and the performance parameters are as follows:
Figure BDA0003591132290000071
example 7
The 600 HB-grade wear-resistant steel comprises the following chemical components in percentage by mass: 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%, the balance being Fe and unavoidable impurities; the Brinell hardness of the steel grade surface is greater than or equal to 570 HBW.
The production method of the 600HB wear-resistant steel comprises the following steps:
s1, smelting the desulfurized molten iron in a smelting furnace, performing LF deoxidation alloying, and then conveying to RH vacuum treatment, wherein the vacuum degree is less than or equal to 3.0mbar, the vacuum treatment time is 20min after the vacuum degree requirement is met, magnesium treatment is performed on a magnesium-aluminum wire after the vacuum is finished, the length of the magnesium-aluminum wire is 200m after the magnesium treatment is finished, and static stirring is performed for 15min after the magnesium treatment is finished;
s2, after the molten steel refining treatment is finished, the casting blank is sent to continuous casting for casting, the casting speed is 0.6m/min, the superheat degree is 1 ℃, full-protection casting is adopted, a dynamic soft reduction process is adopted, and the casting blank needs thermal inspection and temperature-waiting coping;
s3, keeping the temperature of the casting blank to be 150 ℃ after thermal detection, and feeding the casting blank into a furnace, wherein the heating process of the heating furnace is as follows: the temperature of the furnace is 450 ℃, the heating speed is 10 ℃/min, the heating speed of 600 ℃ is 5 ℃/min, the heating speed of 1000 ℃ is 2 ℃/min, the temperature is maintained at 1100 ℃ for 20min, and then the product is taken out of the heating furnace and rolled by adopting a TMCP rolling process;
s4, sending the rolled steel plate to heat treatment for quenching and tempering, setting the primary quenching temperature as 910 ℃, preserving the heat for 30min, and cooling by water; setting the secondary quenching temperature as 860 ℃, preserving the heat for 25min, and cooling by water; tempering and heating at 250 ℃, preserving heat for 50min, and air cooling;
s5, heating the steel plate to 120 ℃ by using an electronic heating pad after tempering, taking the steel plate out of the furnace, cutting by using a combustion gun at a cutter starting speed of 160mm/min and a cutting speed of 350mm/min, covering refractory heat-insulating cotton after cutting, and slowly cooling to room temperature to eliminate stress generated by cutting.
The metallographic structure obtained is shown in fig. 7, and the performance parameters are as follows:
Figure BDA0003591132290000081
example 8
The 600 HB-grade wear-resistant steel comprises the following chemical components in percentage by mass: 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%, the balance being Fe and unavoidable impurities; the Brinell hardness of the steel grade surface is greater than or equal to 570 HBW.
The production method of the 600HB wear-resistant steel comprises the following steps:
s1, smelting the desulfurized molten iron in a smelting furnace, performing LF deoxidation alloying, and then conveying to RH vacuum treatment, wherein the vacuum degree is less than or equal to 3.0mbar, the vacuum treatment time is 22min after the vacuum degree requirement is met, magnesium treatment is performed on a magnesium-aluminum wire after the vacuum is finished, the length of the magnesium-aluminum wire is 210m after the magnesium treatment is roasted, and the magnesium treatment is statically stirred for 20min after the magnesium treatment is finished;
s2, after the molten steel refining treatment is finished, the casting blank is sent to continuous casting for casting, the casting speed is 1.0m/min, the superheat degree is 15 ℃, full-protection casting is adopted, a dynamic soft reduction process is adopted, and the casting blank needs thermal inspection and temperature-waiting coping;
s3, keeping the temperature at 300 ℃ after the casting blank is subjected to thermal detection, and feeding into a furnace, wherein the heating process of the heating furnace is as follows: heating at 520 deg.C and 6 deg.C/min and 1050 deg.C and 2 deg.C/min at 800 deg.C and 1100 deg.C for 20min, taking out of the furnace, and rolling by TMCP rolling process;
s4, sending the rolled steel plate to heat treatment for quenching and tempering, setting the primary quenching temperature to be 920 ℃, preserving the heat for 40min, and cooling by water; setting the secondary quenching temperature as 870 ℃ of heating temperature, keeping the temperature for 28min, and cooling by water; tempering and heating at 255 ℃, preserving heat for 55min, and air cooling;
and S5, heating the steel plate to 135 ℃ by using an electronic heating pad after tempering, discharging from the furnace, cutting by using a combustion gun at a cutting starting speed of 180mm/min and a cutting speed of 365mm/min, covering refractory heat-insulating cotton after cutting, and slowly cooling to room temperature to eliminate stress generated by cutting.
The metallographic structure obtained is shown in fig. 8, and the performance parameters are as follows:
Figure BDA0003591132290000091
example 9
The 600 HB-grade wear-resistant steel comprises the following chemical components in percentage by mass: 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 being Fe and unavoidable impurities; the Brinell hardness of the steel grade surface is greater than or equal to 570 HBW.
The production method of the 600HB wear-resistant steel comprises the following steps:
s1, smelting the desulfurized molten iron in a smelting furnace, performing LF deoxidation alloying, and then conveying to RH vacuum treatment, wherein the vacuum degree is less than or equal to 3.0mbar, the vacuum treatment time is 25min after the vacuum degree requirement is met, magnesium treatment is performed on a magnesium-aluminum wire after the vacuum is finished, the length of the magnesium-aluminum wire is roasted to be 220m, and the magnesium treatment is statically stirred for 25min after the magnesium treatment is finished;
s2, after finishing the molten steel refining treatment, sending the molten steel to continuous casting for casting, wherein the casting speed is 1.3m/min, the superheat degree is 20 ℃, full-protection casting is adopted, a dynamic soft reduction process is adopted, and the casting blank needs thermal inspection and temperature-waiting coping;
s3, keeping the temperature of the casting blank to be 450 ℃ after thermal detection, and feeding the casting blank into a furnace, wherein the heating process of the heating furnace is as follows: heating at 600 deg.C at 15 deg.C/min, 1000 deg.C at 7 deg.C/min, 1100 deg.C at 2 deg.C/min, maintaining at 1100 deg.C for 20min, taking out of the heating furnace, and rolling by TMCP rolling process;
s4, sending the rolled steel plate to heat treatment for quenching and tempering, setting the primary quenching temperature to be 930 ℃, preserving heat for 50min, and cooling by water; setting the secondary quenching temperature as 880 ℃, preserving the heat for 30min, and cooling by water; tempering and heating at 260 ℃, preserving heat for 60min, and air cooling;
s5, heating the steel plate to 150 ℃ by using an electronic heating pad after tempering, discharging from the furnace, cutting by using a combustion gun, starting the cutting at the speed of 200mm/min and cutting at the speed of 380mm/min, covering refractory heat-insulating cotton after cutting, and slowly cooling to room temperature to eliminate stress generated by cutting.
The metallographic structure obtained is shown in fig. 9, and the performance parameters are as follows:
Figure BDA0003591132290000092

Claims (5)

1. the wear-resistant steel with the grade of 500HB or above is characterized by comprising the following chemical components in percentage by mass: c: 0.15% -0.45%, Si: 0.15-0.50%, Mn: 0.50-1.80%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, V is less than or equal to 0.030%, Nb is less than or equal to 0.050%, Ti: 0.008-0.025%, Cr: 0.50-1.50%, Ni is less than or equal to 1.00%, Mo is 0.20-0.80%, Al: 0.025% -0.055%, B: 0.0010-0.0050%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities; the Brinell hardness of the steel grade surface is greater than or equal to 470 HBW.
2. The wear resistant steel of 500HB level or more according to claim 1, wherein: the 500HB wear-resistant steel comprises the following chemical components in percentage by mass: c: 0.15% -0.35%, Si: 0.20-0.40%, Mn: 0.50-1.60%, P is less than or equal to 0.015%, S is less than or equal to 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 to 0.0018 percent, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities; the Brinell hardness of the steel grade surface is greater than or equal to 470 HBW.
3. The wear-resistant steel of 500HB or above according to claim 1, wherein: the 550HB wear-resistant steel comprises the following chemical components in percentage by mass: c: 0.16% -0.36%, Si: 0.15-0.35%, Mn: 0.80-1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.002%, Nb: 0.020 to 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 to 0.0018 percent, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities; the Brinell hardness of the steel grade surface is greater than or equal to 530 HBW.
4. The wear resistant steel of 500HB level or more according to claim 1, wherein: the 600HB wear-resistant steel comprises the following chemical components in percentage by mass: c: 0.35-0.45%, Si: 0.20-0.50%, Mn: 0.50-1.80%, P is less than or equal to 0.013%, S is less than or equal to 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 to 0.0018 percent, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities; the Brinell hardness of the steel grade surface is greater than or equal to 570 HBW.
5. The method for producing the wear-resistant steel with the grade of 500HB or more as claimed in claim 1, is characterized by comprising the following steps of:
s1, smelting the desulfurized molten iron in a smelting furnace, performing LF deoxidation alloying, and then conveying to RH vacuum treatment, wherein the vacuum degree is less than or equal to 3.0mbar, the vacuum treatment time is 20-25 min after the vacuum degree requirement is met, magnesium treatment is performed on a magnesium-aluminum wire after the vacuum is finished, the length of the roasted magnesium-aluminum wire is 200-220 m, and the magnesium treatment is statically stirred for 15-25 min after the magnesium treatment is finished;
s2, after the molten steel refining treatment is finished, the casting blank is sent to continuous casting for casting, the casting speed is 0.6-1.3 m/min, the superheat degree is 10-20 ℃, full-protection casting is adopted, a dynamic soft reduction process is adopted, and the casting blank needs thermal inspection and temperature-waiting coping;
s3, keeping the temperature of the casting blank to be 150-450 ℃ after thermal detection, and feeding the casting blank into a furnace, wherein the heating process of the heating furnace is as follows: the heating speed is 10-15 ℃/min at the charging temperature of 450-600 ℃, 5-7 ℃/min at the heating speed of 600-1000 ℃, 2 ℃/min at the heating speed of 1000-1100 ℃, and the temperature is kept at 1100 ℃ for 20min, and then the mixture is taken out of the heating furnace and rolled by adopting a TMCP rolling process;
s4, sending the rolled steel plate to heat treatment for quenching and tempering, setting the primary quenching temperature as 910-930 ℃, preserving heat for 30-50 min, and cooling with water; setting the secondary quenching temperature to be 860-880 ℃, preserving the heat for 25-30 min, and cooling by water; tempering and heating at 250-260 ℃, preserving heat for 50-60 min, and air cooling;
s5, heating the steel plate to 120-150 ℃ by using an electronic heating pad after tempering, discharging from the furnace, cutting by using a combustion gun at a cutter starting speed of 160-200 mm/min and a cutting speed of 350-380 mm/min, covering a fireproof heat-preservation cotton after cutting, and slowly cooling to room temperature to eliminate stress generated by cutting.
CN202210377101.5A 2022-04-12 2022-04-12 Wear-resistant steel with grade of 500HB or above and production method thereof Pending CN114672735A (en)

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Application publication date: 20220628