CN117089773A - 一种基于连续热处理产线的hb400级耐磨耐蚀钢及生产方法 - Google Patents
一种基于连续热处理产线的hb400级耐磨耐蚀钢及生产方法 Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 24
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Abstract
一种基于连续热处理产线的HB400级耐磨耐蚀钢,其组分及wt%:C:0.10~0.18%,Si:不超过0.2%,Mn:0.2~0.9%,P≤0.020%,S≤0.010%,Als:0.03~0.06%,Ti:0.005~0.01%,Cu:不超过0.2%;生产方法:常规冶炼并浇铸成坯;对铸坯加热后热轧并卷取;连续开卷并淬火;高速冷却;按定尺横切后回火;自然冷却至室温。本发明在保证产品硬度HB不低于400、屈服强度不低于950MPa、抗拉强度不低于1220MPa、延伸率不低于10%,且耐腐蚀的前提下,使组分简单、产品质量性能均匀,生产成本降低不低于2%。
Description
技术领域
本发明涉及一种机械工程用耐磨钢及生产方法,具体属于一种HB400级耐磨耐蚀钢及生产方法。
背景技术
低合金高强度耐磨钢应用于冶金、矿山、建材、铁路、电力、煤炭等机械装备中,随着国家重大战略的深入推进,商用车、工程机械等下游行业对于耐磨钢需求量与日俱增,对于某些腐蚀性环境下,除了需要耐磨性以外,还需要具备一定的耐腐蚀性能。当前耐磨钢主要采用单张钢板调质热处理工艺生产,即热轧成卷后,横切成热轧板,进入热处理炉进行淬火、回火后,得到相应级别的耐磨钢成品。然而,单张板进入热处理炉进行热处理,不仅生产效率低下,且使钢板加热时的温度等均匀性难以保证。
可见,现有耐磨蚀钢存在生产流程长、生产效率低、均匀性不好等技术难题,因此有必要重新设计成分、工艺,提高产品质量和生产效率。
经检索:
中国专利公开号为CN102605234A的文献,公开了《一种HB400级耐磨钢板及其制造方法》,其成分重量百分比为:C:0.08-0.24%、Si:0.10-0.30%、Mn:0.70-1.70%、P:≤0.050%、S:≤0.030%、Cr:≤1.00%、Mo:≤0.60%、Al:0.01-0.10%、B:0.0005-0.0040%、Ti:0.005-0.06%,且满足:0.15≤Cr+Mo≤1.20%,0.011%≤Al+Ti≤0.15%,余量为Fe和不可避免的杂质。采用铸造-控轧-调质热处理工艺生产,性能优良,适用于制造工程机械中易磨损设备,其不足之处在于由于采用单张板进行调质热处理工艺,生产流程长,生产效率低,头尾和边部性能不能有效保证。
在目前的单张板淬火时,其头尾的显微组织和力学性能不均匀,头尾约30cm的板形通常无法完全保证,头尾的强度、硬度等性能指标和不平度等板形质量与正常部位有较大差距,用户使用时易出现部件挠度、直线度超差等加工异常问题。
为了解决这一问题,单板淬火时,通过工艺优化、水量调节和辊速协同调整等方法来改善,但难以从根本上解决问题,而从根本上解决此问题,要想真正意义上的解决头尾问题,必须去除“头尾”,但一直未有突破。
发明内容
本发明在于克服现有技术存在的不足,提供一种在保证产品硬度HB不低于400、屈服强度不低于950MPa、抗拉强度不低于1220MPa、延伸率不低于10%,且耐腐蚀的前提下,使组分简单、产品质量性能均匀的基于连续热处理产线的HB400级耐磨耐蚀钢及生产方法。
实现上述目的的措施:
一种基于连续热处理产线的HB400级耐磨耐蚀钢,其组分及重量百分比含量为:C:0.10~0.18%,Si:不超过0.2%,Mn:0.2~0.9%,P≤0.020%,S≤0.010%,Als:0.03~0.06%,Ti:0.005~0.01%,Cu:不超过0.2%,其余为Fe及不可避免的杂质。
优选地:Mn的重量百分比含量为0.20~0.60%。
优选地:Cu的重量百分比含量为0.07~0.15%。
进一步地:添加B的重量百分比含量不超过0.0003%。
一种基于连续热处理产线的HB400级耐磨耐蚀钢的生产方法,其步骤:
1)常规冶炼并浇铸成坯;
2)对铸坯进行常规加热后进行热轧并卷取;
3)连续开卷并进行淬火,控制淬火温度在850~950℃,控制淬火时间在5~10分钟;
4)进行高速冷却,在冷却速度为50~100℃/s下冷却至50~150℃;
5)按定尺横切后进行回火,控制回火温度在200~240℃,回火时间在20~50min;
6)自然冷却至室温。
优选地:淬火温度在865~930℃。
优选地:在冷却速度为58~87℃/s下冷却至59~135℃。
优选地:回火温度在205~228℃,回火时间在26~40min。
本发明中各元素及主要工艺的作用及机理
C是提高材料强度最廉价的元素,随着含碳量增加,硬度、强度提高,但塑韧性和焊接性能降低。综合考虑,C重量百分含量为0.10~0.18%即可;
Si能降低碳在铁素体中的扩散速度,促进铁素体形成,也会恶化表面质量。综合考虑,Si重量百分含量不超过0.2%为宜;
Mn显著降低Ar1温度、奥氏体分解速度,提高过冷奥氏体稳定性,促进奥氏体释放应力,增加最终组织中的残奥含量,提高冷弯性能,但Mn含量若太高,会增加回火脆性,导致严重中心偏析,综合考虑,Mn重量百分含量为0.2~1.3%为宜。
Als在钢中可脱氧,降低夹杂物含量,也能起到细化晶粒的作用,综合考虑,Als在0.03~0.06%;
Ti在钢的凝固过程中能与N结合生成稳定的TiN,可强烈阻碍奥氏体晶界迁移,从而细化奥氏体晶粒。综合考虑,Ti重量百分含量为0.005~0.01%为宜;
Cu:少量的铜加入钢中可以提高抗大气腐蚀性能,与磷配合使用时效果更为显著。但含铜较高时,在热加工时容易开裂。综合考虑,Cu重量百分含量不超过0.2%。
钢中加入微量的B可极大提高淬透性,但B过多时,易在晶界富集,会降低晶界结合能,使钢板受到冲击载荷时更倾向于沿晶断裂,降低钢板的低温冲击功,因此,本发明中B的加入量为≤0.0003%。
P、S是钢中有害的杂质元素,钢中P易在钢中形成偏析,降低钢的韧性和焊接性能,S易形成塑性硫化物,使钢板产生分层,恶化钢板性能,故P、S含量越低越好,综合考虑,将钢的P、S含量为0.005%≤P≤0.020%,S≤0.010%。P含量不小于0.005%的原因在于与Cu配合,可进一步提高抗大气腐蚀性能。
本发明之所以控制淬火温度在850~950℃,控制淬火时间在5~10分钟,是由于此工艺下,可以保证较好的淬火组织和淬火板形,较低的淬火温度会进入两相区,最终组织中会存在铁素体,使得强度下降,太高的淬火温度又容易引起原始奥氏体晶粒粗大,韧性会急剧恶化。
本发明之所以控制冷却速度在50~100℃/s下冷却至50~150℃,是由于冷却速度较低时,可能会在冷却过程中生成贝氏体,贝氏体的强度与马氏体差异明显,最终影响淬火态的强度和硬度,当冷却速度过高时,冷却强度过大,热应力过大,板形容易恶化,如20~60mm/m的水平,即使通过后续低温回火,也难以达到应用要求(5mm/m以下)。冷后温度50~150℃,一方面是为了使得奥氏体在淬火后稳定,保留少量的残余奥氏体组织,使得材料韧化,另一方面,保留一定的自回火效果,使得钢卷应力减小。
本发明之所以控制控制回火温度在200~240℃,回火时间在20~50min,是由于当回火温度低于200℃或回火时间低于20min,回火效果不佳,对于板形和内应力的改善能力弱,当回火温度高于240℃或回火时间高于50min,马氏体中过饱和的碳易析出,固溶度下降,强度和硬度的影响较大,性能不合的风险较大。
本发明与现有技术相比,本发明在保证产品硬度HB不低于400、屈服强度不低于950MPa、抗拉强度不低于1220MPa、延伸率不低于10%,且耐腐蚀的前提下,使组分简单、产品质量性能均匀,生产成本降低不低于2%。
具体实施方式
下面对本发明予以详细描述:
表1为本发明各实施例及对比例的化学成分列表;
表2为本发明各实施例及对比例的主要工艺参数列表;
表3为本发明各实施例及对比例的性能检测情况列表;
表4为本发明各实施例钢及对比例的耐腐蚀结果列表。
本发明各实施例按照以下步骤生产
1)常规冶炼并浇铸成坯;
2)对铸坯进行常规加热后进行热轧并卷取;
3)连续开卷并进行淬火,控制淬火温度在850~950℃,控制淬火时间在5~10分钟;
4)进行高速冷却,在冷却速度为50~100℃/s下冷却至50~150℃;
5)按定尺横切后进行回火,控制回火温度在200~240℃,回火时间在20~50min;
6)自然冷却至室温。
表1本发明各实施例及对比例的化学成分列表(wt%)
表2本发明各实施例及对比例的主要工艺参数列表
表3本发明各实施例及对比例的力学性能检测结果列表
为了能更好的反映出本发明钢耐蚀性的优点,本实施方式中提供了2组比较钢的耐蚀性结果,比较钢选用钢种Q345见表4。(腐蚀方法:温度23±2℃,10%H2SO4+3.5%NaCl,全浸24h)
表4本发明各实施例钢及对比例的耐腐蚀结果(g/m2·h)
从表1~3可以看出,本发明通过创新性的工艺优化,开发HB400级别耐磨蚀钢连续淬火工艺和技术,力学性能和耐腐蚀性能与对比例处于同一水平,但由于连续淬火,其工艺流程更短,生产效率更高,生产成本降低不低于2%。
本具体实施方式仅为最佳例举,并非对本发明技术方案的限制性实施。
Claims (8)
1.一种基于连续热处理产线的HB400级耐磨耐蚀钢,其组分及重量百分比含量为:C:0.10~0.18%,Si:不超过0.2%,Mn:0.2~0.9%,P≤0.020%,S≤0.010%,Als:0.03~0.06%,Ti:0.005~0.01%,Cu:不超过0.2%,其余为Fe及不可避免的杂质。
2.如权利要求1所述的一种基于连续热处理产线的HB400级耐磨耐蚀钢,其特征在于:
Mn的重量百分比含量为0.20~0.60%。
3.如权利要求1所述的一种基于连续热处理产线的HB400级耐磨耐蚀钢,其特征在于:Cu的重量百分比含量为0.07~0.15%。
4.如权利要求1所述的一种基于连续热处理产线的HB400级耐磨耐蚀钢,其特征在于:添加B的重量百分比含量不超过0.0003%。
5.生产如权利要求1所述的一种基于连续热处理产线的HB400级耐磨耐蚀钢的方法,其步骤:
1)常规冶炼并浇铸成坯;
2)对铸坯进行常规加热后进行热轧并卷取;
3)连续开卷并进行淬火,控制淬火温度在850~950℃,控制淬火时间在5~10分钟;
4)进行高速冷却,在冷却速度为50~100℃/s下冷却至50~150℃;
5)按定尺横切后进行回火,控制回火温度在200~240℃,回火时间在20~50min;
6)自然冷却至室温。
6.如权利要求56所述的一种基于连续热处理产线的HB400级耐磨耐蚀钢的生产方法,其特征在于:淬火温度在865~930℃。
7.如权利要求5所述的一种基于连续热处理产线的HB400级耐磨耐蚀钢的生产方法,其特征在于:在冷却速度为58~87℃/s下冷却至59~135℃。
8.如权利要求5所述的一种基于连续热处理产线的HB400级耐磨耐蚀钢的生产方法,其特征在于:回火温度在205~228℃,回火时间在26~40min。
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