CN110202003B - 一种非调质钢长棒状轴类锻件的制备工艺 - Google Patents
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Abstract
本发明涉及一种非调质钢长棒状轴类锻件的制备工艺,制备工艺采用配料→电炉冶炼→LF精炼→VD真空处理→连铸连轧→开坯→径向锻造→控冷→棒材,严格控制每个工序的工艺参数,制备直径5cm~30cm的长棒状轴类锻件,其锻件晶粒度8~9级,抗拉强度1000~1100MPa,屈服强度810~850MPa,延伸率≥18%,断面收缩率≥45%,冲击韧性(纵向)≥50J,具有良好的抗扭转性能和耐疲劳性能。
Description
技术领域
本发明涉及一种非调质钢及其制备工艺,具体涉及一种长棒轴类零部件用非调质钢材料及其锻造加工制备工艺。
背景技术
绿色可持续发展要求零部件加工制造在选材和加工方法上都要符合低能耗、低污染、低成本。非调质钢是一种在取消调质热处理工艺条件下使性能达到调质钢的强度水平,从而缩短零部件制造工艺流程、同时又节约能源,在汽车、工程机械、石油化工等领域获得广泛应用。然而,非调质钢在长棒状轴类零部件上的应用仍有其局限性,特别是非调质钢的扭转性能与强度存在不匹配情况,目前能够通过晶内铁素体析出、氧化物冶金等方法提高非调质钢的强度,然而,其扭转性能提升的幅度有限。
发明内容
本发明所要解决的技术问题是,针对现有技术存在的问题,提出一种非调质钢长棒状轴类锻件的制备工艺,该方法通过合理的成分设计、径向锻造工艺获得性能优异的非调质钢长棒状轴类零部件。
本发明提供的技术方案是:
一种非调质钢长棒状轴类锻件的制备工艺,制备工艺流程为:配料→电炉冶炼→LF精炼→VD真空处理→连铸连轧→开坯→径向锻造→控冷→棒材;所述电炉冶炼,严格控制电炉终点C、P及出钢温度,出钢过程中加Al金属进行脱氧;所述LF精炼,并进行多点喂铝,分别在钢包的半径1/2处进行4~8点喂铝,速度为1.0~1.5kg/t;所述VD真空处理,过程中喂入钙铁线进行夹杂物变性处理,同时微调合金成分;所述连铸时控制中间包钢液温度1540~1550℃,保持过热度20~25℃,在凝固末端采用轻压下连铸,所述连轧时加热温度1150~1200℃,开轧温度为1100~1150℃,终轧温度910~960℃,轧制后穿水快速冷却,上冷床温度在680~730℃,下冷床相变结束后钢坯进行堆冷,最后冷至室温;所述径向锻造过程中,缓慢加热到700~750℃保温0.5~1小时,随后在1060~1120℃保温1~2小时后开始锻造,径向锻造过程中,铸锭坯料的角度旋转参数为12~18°/锤,坯料进给速度为8~10m/min,锻造分多个道次进行,每次锻造的坯料旋转角度以1°的角度逐渐增加,每次锻造的坯料进给速度以1m/min的速度逐渐降低,终锻温度在900~950℃,所述控冷过程中冷却至580~620℃等温1.5~2小时,随后风冷至室温。
所述配料的化学成分按质量百分比计包括以下成分:C 0.30~0.50,Mn 1.20~1.60,Si 0.68~0.90,Cr 0.10~0.30,Ni≤0.25,V 0.05~0.15,Nb 0.01~0.05,Ti 0.01~0.05,Cu 0.21~0.35,Al 0.05~0.10,N 0.008~0.02,S≤0.02,P≤0.01,其余为Fe及不可避免的杂质。
所述长棒状轴类锻件,其直径在5cm~30cm。
所述长棒状轴类锻件晶粒度8~9级,抗拉强度1000~1100MPa,屈服强度810~850MPa,延伸率≥18%,断面收缩率≥45%,纵向冲击韧性≥50J。
本发明的非调质钢,可代替传统的Cr、Cr-Mo调质钢,也比常见的38MnVS非调质钢的性能更加优异,通过本技术制备的非调质钢棒材轴类零部件晶粒度8~9级,抗拉强度1000~1100MPa,屈服强度810~850MPa,延伸率≥18%,断面收缩率≥45%,冲击韧性(纵向)≥50J,具有良好的扭转性能、疲劳性能优异,各项指标均能达到高端汽车的设计要求。
具体实施方式
一种非调质钢长棒状轴类零部件,其化学成分按重量百分比计包括:C 0.30~0.50,Mn 1.20~1.60,Si 0.68~0.90,Cr 0.10~0.30,Ni≤0.25,V 0.05~0.15,Nb 0.01~0.05,Ti 0.01~0.05,Cu 0.21~0.35,Al 0.05~0.10,N 0.008~0.02,S≤0.02,P≤0.01,其余为Fe及不可避免的杂质。
根据本发明的生产工艺,各实施例成分如表1所示。
表1实施例的化学成分(wt%)
上述一种非调质钢长棒状轴类锻件制备工艺,该制备工艺流程为:配料→电炉冶炼→LF精炼→VD真空处理→连铸连轧→开坯→径向锻造→控冷→棒材,具体操作工艺如下。
电炉熔炼工序中:严格控制电炉熔炼终点C含量在实施例范围0.02%上下波动,P含量在实施例范围0.005%上下波动,出钢温度为1550-1580℃,出钢过程中添加纯Al金属颗粒进行预脱氧;
LF精炼工序中:LF精炼时进行多点喂铝丝,根据钢液中氧含量分别在钢包的1/2处进行4~8点喂铝丝,速度为1.0~1.5kg/t;
VD真空处理工序中:保持氩气搅拌,真空后按目标值微调成分,喂入CeFe线进行夹杂物变性处理,保证吹氩气时间大于15分钟;
连铸工序中:控制中间包钢液温度1540~1550℃,保持过热度20~25℃,在凝固末端采用轻压下连铸;
连轧工序中:轧制时加热温度1150~1200℃,开轧温度约为1100~1150℃,终轧温度910~960℃,轧制后穿水快速冷却,上冷床温度在680~730℃,下冷床相变结束后钢坯进行堆冷,最后冷至室温;
锻造工序中:缓慢加热到700~750℃保温0.5~1小时,随后在1060~1120℃保温1~2小时后开始锻造,径向锻造过程中,铸锭坯料的角度旋转参数为12~18°/锤,坯料进给速度为8~10m/min,锻造分多个道次进行,每次锻造的坯料旋转角度以1°的角度逐渐增加,每次锻造的坯料进给速度以1m/min的速度逐渐降低,终锻温度在900~950℃;根据最终棒材的直径,选取不同尺寸的径向锻造锤头,
冷却工序中:快速冷却至580~620℃等温1.5~2小时,随后风冷至室温。
探伤工序中:对棒材进行探伤,将合格的棒材进行标识、入库为成品。
棒材轴类零部件组织晶粒度为8~9级。
棒材轴类零部件力学性能为:抗拉强度1000~1100MPa,屈服强度810~850MPa,延伸率≥18%,断面收缩率≥45%,冲击韧性(纵向)≥50J,具有良好的扭转性能、疲劳性能优异,各项指标均能达到用户要求。
除上述实施例外,本发明还可以有其它实施方式。凡采用等同替换或等效变换形成的技术方案,均落在本发明要求的保护范围。
Claims (3)
1.一种非调质钢长棒状轴类锻件的制备工艺,其特征在于:制备工艺流程为:配料→电炉冶炼→LF精炼→VD真空处理→连铸连轧→开坯→径向锻造→控冷→棒材;所述电炉冶炼,严格控制电炉终点C、P及出钢温度,出钢过程中加Al金属进行脱氧;所述LF精炼,并进行多点喂铝,分别在钢包的半径1/2处进行4~8点喂铝,速度为1.0~1.5kg/t;所述VD真空处理,过程中喂入钙铁线进行夹杂物变性处理,同时微调合金成分;所述连铸时控制中间包钢液温度1540~1550℃,保持过热度20~25℃,在凝固末端采用轻压下连铸,所述连轧时加热温度1150~1200℃,开轧温度为1100~1150℃,终轧温度910~960℃,轧制后穿水快速冷却,上冷床温度在680~730℃,下冷床相变结束后钢坯进行堆冷,最后冷至室温;所述径向锻造过程中,缓慢加热到700~750℃保温0.5~1小时,随后在1060~1120℃保温1~2小时后开始锻造,径向锻造过程中,铸锭坯料的角度旋转参数为12~18°/锤,坯料进给速度为8~10m/min,锻造分多个道次进行,每次锻造的坯料旋转角度以1°的角度逐渐增加,每次锻造的坯料进给速度以1m/min的速度逐渐降低,终锻温度在900~950℃,所述控冷过程中冷却至580~620℃等温1.5~2小时,随后风冷至室温;所述配料的化学成分按质量百分比计包括以下成分:C 0.30~0.50,Mn 1.20~1.60,Si 0.68~0.90,Cr 0.10~0.30,Ni≤0.25,V 0.05~0.15,Nb 0.01~0.05,Ti 0.01~0.05,Cu 0.21~0.35,Al 0.05~0.10,N 0.008~0.02,S≤0.02,P≤0.01,其余为Fe及不可避免的杂质。
2.根据权利要求1所述的一种非调质钢长棒状轴类锻件的制备工艺,其特征在于:所述长棒状轴类锻件,其直径在5cm~30cm。
3.根据权利要求1所述的一种非调质钢长棒状轴类锻件的制备工艺,其特征在于:所述长棒状轴类锻件晶粒度8~9级,抗拉强度1000~1100MPa,屈服强度810~850MPa,延伸率≥18%,断面收缩率≥45%,纵向冲击韧性≥50J。
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