CN114672735A - 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 PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 114
- 239000010959 steel Substances 0.000 title claims abstract description 114
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 52
- 229910052796 boron Inorganic materials 0.000 claims abstract description 20
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 19
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 18
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 18
- 239000012535 impurity Substances 0.000 claims abstract description 18
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 18
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 18
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 17
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 13
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 8
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 104
- 238000005266 casting Methods 0.000 claims description 73
- 238000005520 cutting process Methods 0.000 claims description 51
- 239000011777 magnesium Substances 0.000 claims description 51
- 238000001816 cooling Methods 0.000 claims description 46
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 39
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 34
- 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
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 22
- 238000009489 vacuum treatment Methods 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
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- 238000002485 combustion reaction Methods 0.000 claims description 11
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- 238000001514 detection method Methods 0.000 claims description 11
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- 229910052742 iron Inorganic materials 0.000 claims description 11
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- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 239000010936 titanium Substances 0.000 description 14
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
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- 229910001339 C alloy Inorganic materials 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000009869 magnesium metallurgy Methods 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- ZPZCREMGFMRIRR-UHFFFAOYSA-N molybdenum titanium Chemical compound [Ti].[Mo] ZPZCREMGFMRIRR-UHFFFAOYSA-N 0.000 description 1
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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
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:
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:
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:
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:
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:
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:
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:
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:
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:
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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WO2023197572A1 (zh) * | 2022-04-12 | 2023-10-19 | 南京钢铁股份有限公司 | 一种500hb级以上的耐磨钢及其生产方法 |
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