CN114686768A - 一种360hb-450hb级耐磨钢及其生产方法 - Google Patents
一种360hb-450hb级耐磨钢及其生产方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 122
- 239000010959 steel Substances 0.000 title claims abstract description 122
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 27
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 18
- 239000012535 impurity Substances 0.000 claims abstract description 18
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 18
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 18
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- 239000000126 substance Substances 0.000 claims abstract description 18
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- 238000005266 casting Methods 0.000 claims description 58
- 238000010438 heat treatment Methods 0.000 claims description 56
- 238000005520 cutting process Methods 0.000 claims description 51
- 238000001816 cooling Methods 0.000 claims description 45
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 39
- 238000010791 quenching Methods 0.000 claims description 34
- 230000000171 quenching effect Effects 0.000 claims description 34
- 238000005496 tempering Methods 0.000 claims description 33
- 238000003723 Smelting Methods 0.000 claims description 23
- 238000005096 rolling process Methods 0.000 claims description 23
- 238000009489 vacuum treatment Methods 0.000 claims description 23
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
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- 238000010079 rubber tapping Methods 0.000 claims description 11
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- 238000010586 diagram Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
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Abstract
本发明公开了一种360HB‑450HB级耐磨钢,其化学成分及质量百分比如下:C:0.10%~0.30%,Si:0.20%~0.50%,Mn:0.80%~1.60%,P≤0.020%,S≤0.005%,Ti:0.008%~0.025%,Cr:0.20%~1.00%,Ni:≤0.60%,Mo:0.10%~0.50%,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330~480HBW,还公开了上述耐磨钢的生产方法。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NM360~NM450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
技术领域
本发明属于冶金工程领域,具体涉及一种360HB-450HB级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360HB级别以上要求表面布氏硬度及纵向-20度冲击功,为了达到产品的性能要求,产品使用合金含量高,产品要求的抗拉强度高,在铸坯及钢板切割过程会产生突发性的脆性断裂,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360HB-450HB级耐磨钢,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360HB-450HB级耐磨钢,其化学成分及质量百分比如下:C:0.10%~0.30%,Si:0.20%~0.50%,Mn:0.80%~1.60%,P≤0.020%,S≤0.005%,Ti:0.008%~0.025%,Cr:0.20%~1.00%,Ni:≤0.60%,Mo:0.10%~0.50%,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330~480HBW。
进一步的,360HB级耐磨钢的化学成分及质量百分比如下:C:0.12%~0.15%,Si:0.20%~0.40%,Mn:1.20%~1.50%,P≤0.015%,S≤0.003%,Ti:0.008%~0.020%,Cr:0.20%~0.80%,Mo:0.15%~0.30%,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330~390HBW。
进一步的,400HB级耐磨钢的化学成分及质量百分比如下:C:0.10%~0.20%,Si:0.20%~0.40%,Mn:0.80%~1.50%,P≤0.020%,S≤0.005%,Ti:0.008%~0.025%,Cr:0.30%~0.90%,Ni:0.20%~0.50%,Mo:0.10%~0.50%,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370~430HBW。
进一步的,450HB级耐磨钢的化学成分及质量百分比如下:C:0.20%~0.30%,Si:0.20%~0.50%,Mn:1.00%~1.60%,P≤0.015%,S≤0.003%,Ti:0.008%~0.025%,Cr:0.30%~1.00%,Ni:0.20%~0.60%,Mo:0.20%~0.50%,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420~480HBW。
上述360HB-450HB级耐磨钢的生产方法,包括以下步骤:
S1、铁水采用KR法进行脱硫顶底复吹转炉冶炼,终点温度1590~1630℃,C:0.05%~0.10%,P≤0.013%后进行出钢作业;
S2、转炉冶炼后送至LF进行脱氧合金化,成分满足要求进行RH真空处理,真空度≤3.0mbar,满足真空度要求后真空处理时间15~20min;
S3、钢水转运后送至连铸台进行浇铸,中包过热度10~20℃,连铸拉速0.6~1.3m/min,采用全保护浇铸避免钢水二次氧化;
S4、铸坯热检后保持温度150~450℃入炉,加热炉奥氏体化温度1200±20℃,采用常规轧制工艺进行轧制;
S5、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870~890℃,保温20~40min,水冷;二次淬火温度设定为加热温度850~870℃,保温25~30min,水冷;回火加热温度260~280℃,保温50~60min,空冷;
S6、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NM360~NM450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、本发明采用真空处理工艺获得了洁净钢水,提升了铸坯的表面质量,避免了晶间裂纹的发生,减少了铸坯及钢板延迟开裂的发生;
3、采用独特的铸坯入炉温度,解决了铸坯内应力对钢板质量的危害,高温奥氏体技术应用及常规轧制技术的应用,获得了高强度钢表面及内在质量的要求;
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360HB级耐磨钢,其化学成分及质量百分比如下:C:0.12%,Si:0.20%,Mn:1.20%,P:0.006%,S:0.001%,Ti:0.008%,Cr:0.20%,Mo:0.15%,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330~390HBW。
采用以下生产方法,包括以下步骤:
S1、铁水采用KR法进行脱硫顶底复吹转炉冶炼,终点温度1590℃,C:0.05%,P:0.004%后进行出钢作业;
S2、转炉冶炼后送至LF进行脱氧合金化,成分满足要求进行RH真空处理,真空度≤3.0mbar,满足真空度要求后真空处理时间15min;
S3、钢水转运后送至连铸台进行浇铸,中包过热度10℃,连铸拉速0.6m/min,采用全保护浇铸避免钢水二次氧化;
S4、铸坯热检后保持温度150℃入炉,加热炉奥氏体化温度1200±20℃,采用常规轧制工艺进行轧制;
S5、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870℃,保温20min,水冷;二次淬火温度设定为加热温度850℃,保温25min,水冷;回火加热温度260℃,保温50min,空冷;
S6、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:
实施例2
一种360HB级耐磨钢,其化学成分及质量百分比如下:C:0.14%,Si:0.30%,Mn:1.35%,P:0.010%,S:0.002%,Ti:0.014%,Cr:0.50%,Mo:0.22%,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330~390HBW。
采用以下生产方法,包括以下步骤:
S1、铁水采用KR法进行脱硫顶底复吹转炉冶炼,终点温度1610℃,C:0.08%,P:0.008%后进行出钢作业;
S2、转炉冶炼后送至LF进行脱氧合金化,成分满足要求进行RH真空处理,真空度≤3.0mbar,满足真空度要求后真空处理时间18min;
S3、钢水转运后送至连铸台进行浇铸,中包过热度15℃,连铸拉速0.8m/min,采用全保护浇铸避免钢水二次氧化;
S4、铸坯热检后保持温度300℃入炉,加热炉奥氏体化温度1200±20℃,采用常规轧制工艺进行轧制;
S5、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880℃,保温30min,水冷;二次淬火温度设定为加热温度860℃,保温27min,水冷;回火加热温度270℃,保温55min,空冷;
S6、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:
实施例3
一种360HB级耐磨钢,其化学成分及质量百分比如下:C:0.15%,Si:0.40%,Mn:1.50%,P:0.015%,S:0.003%,Ti:0.020%,Cr:0.80%,Mo:0.30%,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330~390HBW。
采用以下生产方法,包括以下步骤:
S1、铁水采用KR法进行脱硫顶底复吹转炉冶炼,终点温度1630℃,C:0.10%,P:0.013%后进行出钢作业;
S2、转炉冶炼后送至LF进行脱氧合金化,成分满足要求进行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;
S3、钢水转运后送至连铸台进行浇铸,中包过热度20℃,连铸拉速1.3m/min,采用全保护浇铸避免钢水二次氧化;
S4、铸坯热检后保持温度450℃入炉,加热炉奥氏体化温度1200±20℃,采用常规轧制工艺进行轧制;
S5、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890℃,保温40min,水冷;二次淬火温度设定为加热温度870℃,保温30min,水冷;回火加热温度280℃,保温60min,空冷;
S6、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:
实施例4
一种400HB级耐磨钢,其化学成分及质量百分比如下:C:0.10%,Si:0.20%,Mn:0.80%,P:0.010%,S:0.003%,Ti:0.008%,Cr:0.30%,Ni:0.20%,Mo:0.10%,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370~430HBW。
采用以下生产方法,包括以下步骤:
S1、铁水采用KR法进行脱硫顶底复吹转炉冶炼,终点温度1590℃,C:0.05%,P:0.004%后进行出钢作业;
S2、转炉冶炼后送至LF进行脱氧合金化,成分满足要求进行RH真空处理,真空度≤3.0mbar,满足真空度要求后真空处理时间15min;
S3、钢水转运后送至连铸台进行浇铸,中包过热度10℃,连铸拉速0.6m/min,采用全保护浇铸避免钢水二次氧化;
S4、铸坯热检后保持温度150℃入炉,加热炉奥氏体化温度1200±20℃,采用常规轧制工艺进行轧制;
S5、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870℃,保温20min,水冷;二次淬火温度设定为加热温度850℃,保温25min,水冷;回火加热温度260℃,保温50min,空冷;
S6、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:
实施例5
一种400HB级耐磨钢,其化学成分及质量百分比如下:C:0.15%,Si:0.30%,Mn:1.10%,P:0.015%,S:0.004%,Ti:0.015%,Cr:0.60%,Ni:0.35%,Mo:0.35%,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370~430HBW。
采用以下生产方法,包括以下步骤:
S1、铁水采用KR法进行脱硫顶底复吹转炉冶炼,终点温度1610℃,C:0.08%,P:0.008%后进行出钢作业;
S2、转炉冶炼后送至LF进行脱氧合金化,成分满足要求进行RH真空处理,真空度≤3.0mbar,满足真空度要求后真空处理时间18min;
S3、钢水转运后送至连铸台进行浇铸,中包过热度15℃,连铸拉速0.8m/min,采用全保护浇铸避免钢水二次氧化;
S4、铸坯热检后保持温度300℃入炉,加热炉奥氏体化温度1200±20℃,采用常规轧制工艺进行轧制;
S5、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880℃,保温30min,水冷;二次淬火温度设定为加热温度860℃,保温27min,水冷;回火加热温度270℃,保温55min,空冷;
S6、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:
实施例6
一种400HB级耐磨钢,其化学成分及质量百分比如下:C:0.20%,Si:0.40%,Mn:1.50%,P:0.020%,S:0.005%,Ti:0.025%,Cr:0.90%,Ni:0.50%,Mo:0.50%,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370~430HBW。
采用以下生产方法,包括以下步骤:
S1、铁水采用KR法进行脱硫顶底复吹转炉冶炼,终点温度1630℃,C:0.10%,P:0.013%后进行出钢作业;
S2、转炉冶炼后送至LF进行脱氧合金化,成分满足要求进行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;
S3、钢水转运后送至连铸台进行浇铸,中包过热度20℃,连铸拉速1.3m/min,采用全保护浇铸避免钢水二次氧化;
S4、铸坯热检后保持温度450℃入炉,加热炉奥氏体化温度1200±20℃,采用常规轧制工艺进行轧制;
S5、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890℃,保温40min,水冷;二次淬火温度设定为加热温度870℃,保温30min,水冷;回火加热温度280℃,保温60min,空冷;
S6、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:
实施例7
一种450HB级耐磨钢,其化学成分及质量百分比如下:C:0.20%,Si:0.20%,Mn:1.00%,P:0.005%,S:0.001%,Ti:0.008%,Cr:0.30%,Ni:0.20%,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420~480HBW。
采用以下生产方法,包括以下步骤:
S1、铁水采用KR法进行脱硫顶底复吹转炉冶炼,终点温度1590℃,C:0.05%,P:0.004%后进行出钢作业;
S2、转炉冶炼后送至LF进行脱氧合金化,成分满足要求进行RH真空处理,真空度≤3.0mbar,满足真空度要求后真空处理时间15min;
S3、钢水转运后送至连铸台进行浇铸,中包过热度10℃,连铸拉速0.6m/min,采用全保护浇铸避免钢水二次氧化;
S4、铸坯热检后保持温度150℃入炉,加热炉奥氏体化温度1200±20℃,采用常规轧制工艺进行轧制;
S5、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870℃,保温20min,水冷;二次淬火温度设定为加热温度850℃,保温25min,水冷;回火加热温度260℃,保温50min,空冷;
S6、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:
实施例8
一种450HB级耐磨钢,其化学成分及质量百分比如下:C:0.25%,Si:0.35%,Mn:1.30%,P:0.010%,S:0.002%,Ti:0.015%,Cr:0.70%,Ni:0.40%,Mo:0.35%,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420~480HBW。
采用以下生产方法,包括以下步骤:
S1、铁水采用KR法进行脱硫顶底复吹转炉冶炼,终点温度1610℃,C:0.08%,P:0.008%后进行出钢作业;
S2、转炉冶炼后送至LF进行脱氧合金化,成分满足要求进行RH真空处理,真空度≤3.0mbar,满足真空度要求后真空处理时间18min;
S3、钢水转运后送至连铸台进行浇铸,中包过热度15℃,连铸拉速0.8m/min,采用全保护浇铸避免钢水二次氧化;
S4、铸坯热检后保持温度300℃入炉,加热炉奥氏体化温度1200±20℃,采用常规轧制工艺进行轧制;
S5、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880℃,保温30min,水冷;二次淬火温度设定为加热温度860℃,保温27min,水冷;回火加热温度270℃,保温55min,空冷;
S6、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:
实施例9
一种450HB级耐磨钢,其化学成分及质量百分比如下:C:0.30%,Si:0.50%,Mn:1.60%,P:0.015%,S:0.003%,Ti:0.025%,Cr:1.00%,Ni:0.60%,Mo:0.50%,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420~480HBW。
采用以下生产方法,包括以下步骤:
S1、铁水采用KR法进行脱硫顶底复吹转炉冶炼,终点温度1630℃,C:0.10%,P:0.013%后进行出钢作业;
S2、转炉冶炼后送至LF进行脱氧合金化,成分满足要求进行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;
S3、钢水转运后送至连铸台进行浇铸,中包过热度20℃,连铸拉速1.3m/min,采用全保护浇铸避免钢水二次氧化;
S4、铸坯热检后保持温度450℃入炉,加热炉奥氏体化温度1200±20℃,采用常规轧制工艺进行轧制;
S5、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890℃,保温40min,水冷;二次淬火温度设定为加热温度870℃,保温30min,水冷;回火加热温度280℃,保温60min,空冷;
S6、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:
Claims (5)
1.一种360HB-450HB级耐磨钢,其特征在于,其化学成分及质量百分比如下:C:0.10%~0.30%,Si:0.20%~0.50%,Mn:0.80%~1.60%,P≤0.020%,S≤0.005%,Ti:0.008%~0.025%,Cr:0.20%~1.00%,Ni:≤0.60%,Mo:0.10%~0.50%,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330~480HBW。
2.根据权利要求1所述的360HB-450HB级耐磨钢,其特征在于:360HB级耐磨钢的化学成分及质量百分比如下:C:0.12%~0.15%,Si:0.20%~0.40%,Mn:1.20%~1.50%,P≤0.015%,S≤0.003%,Ti:0.008%~0.020%,Cr:0.20%~0.80%,Mo:0.15%~0.30%,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330~390HBW。
3.根据权利要求1所述的360HB-450HB级耐磨钢,其特征在于:400HB级耐磨钢的化学成分及质量百分比如下:C:0.10%~0.20%,Si:0.20%~0.40%,Mn:0.80%~1.50%,P≤0.020%,S≤0.005%,Ti:0.008%~0.025%,Cr:0.30%~0.90%,Ni:0.20%~0.50%,Mo:0.10%~0.50%,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370~430HBW。
4.根据权利要求1所述的360HB-450HB级耐磨钢,其特征在于:450HB级耐磨钢的化学成分及质量百分比如下:C:0.20%~0.30%,Si:0.20%~0.50%,Mn:1.00%~1.60%,P≤0.015%,S≤0.003%,Ti:0.008%~0.025%,Cr:0.30%~1.00%,Ni:0.20%~0.60%,Mo:0.20%~0.50%,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420~480HBW。
5.权利要求1所述的360HB-450HB级耐磨钢的生产方法,其特征在于,包括以下步骤:
S1、铁水采用KR法进行脱硫顶底复吹转炉冶炼,终点温度1590~1630℃,C:0.05%~0.10%,P≤0.013%后进行出钢作业;
S2、转炉冶炼后送至LF进行脱氧合金化,成分满足要求进行RH真空处理,真空度≤3.0mbar,满足真空度要求后真空处理时间15~20min;
S3、钢水转运后送至连铸台进行浇铸,中包过热度10~20℃,连铸拉速0.6~1.3m/min,采用全保护浇铸避免钢水二次氧化;
S4、铸坯热检后保持温度150~450℃入炉,加热炉奥氏体化温度1200±20℃,采用常规轧制工艺进行轧制;
S5、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870~890℃,保温20~40min,水冷;二次淬火温度设定为加热温度850~870℃,保温25~30min,水冷;回火加热温度260~280℃,保温50~60min,空冷;
S6、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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CN114686768A (zh) * | 2022-04-12 | 2022-07-01 | 南京钢铁股份有限公司 | 一种360hb-450hb级耐磨钢及其生产方法 |
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WO2023155447A1 (zh) * | 2022-02-15 | 2023-08-24 | 南京钢铁股份有限公司 | 一种煤炭采运用高耐磨性用钢及其生产方法 |
WO2023197571A1 (zh) * | 2022-04-12 | 2023-10-19 | 南京钢铁股份有限公司 | 一种360hb-450hb级耐磨钢及其生产方法 |
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