CN114875300A - 一种胀断连杆用热轧圆钢的生产方法 - Google Patents
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Abstract
一种胀断连杆用热轧圆钢的生产方法。采用工艺路线为转炉—LF炉—RH炉—连铸—加热—轧制—冷却。钢的组成重量百分比为C=0.65%~0.75%,Si=0.10%~0.30%,Mn=0.40~0.80%,P=0.020~0.040%,S=0.050%~0.100%,Al≤0.020%,Ni=0.05%~0.25%,Cr=0.10%~0.20%,V=0.03%‑0.10%,N:=0.010%~0.020%,其余为Fe和不可避免的杂质。本发明采用高碳高锰钒氮复合强化、LF精炼技术、VD炉真空脱气技术,适当提高S含量和钢水的纯净度,成功开发珠光体+铁素体组织的胀断连杆用热轧圆钢,产品组织为珠光体+铁素体组织,具有高强度、高硬性、良好的切削性能、冲击性能等,能够很好的满足汽车连杆的胀断使用需求。
Description
技术领域
本发明属于冶金技术领域,涉及一种胀断连杆用热轧圆钢C70S6的生产方法。
背景技术
连杆是用于连接汽车发动机活塞和曲轴之间的一个重要零部件,连杆将活塞的往复直线运改动改变为旋转运动。胀断连杆工艺相比传统机械式粗加工制造工艺,无需采用磨削铣据磨削等传统机加工工艺,而是从连杆盖从连杆体上直接断裂而分离出来的工艺,使得连杆能承受更高转速更大冲击力,使得汽车发动机输出马力更大,加工过程更加绿色环保和节能降耗。汽车胀断连杆用钢材的胀断性能、洁净度、均匀性、力学、冲击性能均有严格的要求。
发明内容
本发明旨在提供一种胀断连杆用热轧圆钢的生产方法,其代表钢种C70S6最大规格为100mm,最小规格为30mm,热轧抗拉强度在800~1000MPa,屈服强度在550~800MPa,延伸率在10%以上,常温冲击AKV在34J以上,能够很好的满足汽车胀断连杆用钢材的使用需求。
本发明的技术方案:
一种胀断连杆用热轧圆钢的生产方法,采用的工艺路线为转炉冶炼—LF精炼—RH真空处理—连铸—加热—轧制,钢的化学组成重量百分比为C=0.65%~0.75%,Si=0.10%~0.30%,Mn=0.40~0.80%,P=0.020~0.040%,S=0.050%~0.100%,Al≤0.020%,Ni=0.05%~0.25%,Cr =0.10%~0.20%,V= 0.03%-0.10%,N:=0.010%~0.020%,其余为Fe和不可避免的杂质;关键工艺步骤包括:
(1)转炉冶炼:终点控制目标C≥0.08%、P≤0.025%;出钢1/4时顺钢流加入脱氧剂、合金和渣料。
(2)LF精炼:钢水在LF炉通电时间≥20min,总吹氩时间≥45 min;冶炼过程使用Al粒进行扩散脱氧;快速造渣脱氧、脱硫,快速成渣,精炼中后期采用酸性调渣剂调整终渣碱度4.0±1.0;当S≤0.005%、温度≥1580℃后使用VN合金增氮+出站前补喂N线控氮;喂Ca线70~100m,间隔5min后喂S线增S。
(3)RH真空处理:总吹氩时间≥30min,采用真空环流氮气,保持时间≥8min、软吹氩时间≥15min;钢水出站上连铸台温度按中包过热度目标值连浇炉≤35℃,开浇炉≤40℃控制。
(4)连铸:采用全程保护浇注,使用整体包水口进行浇注,中包使用无碳覆盖剂进行钢水保护浇注,中包过热度15℃~35℃,结晶器液面波动≤±5mm,使用结晶器电磁搅拌+末端电磁搅拌。
(5)加热:铸坯均热温度控制在1180~1220℃,方坯加热时间180~420min。
(6)轧制:开轧温度控制在1050~1100℃,出炉开启高压水除鳞压力≥24MPa,圆钢采用冷床保温罩+入坑缓冷。
发明原理:
本发明通过采用高碳高锰钒氮成分设计,LF精炼、VD炉真空脱气、轧后缓冷等一系列冶炼和轧制新技术,成功开发了珠光体+铁素体组织,具有高强度、高硬性、良好的切削等性能,能够很好的满足汽车连杆的胀断使用需求,其代表钢种其代表钢种C70S6。
本发明化学成分设计对其强度和延伸性能、热轧硬度、切削比性能等重点考虑,组织设计则是珠光体+铁素体组织。
采用高碳高锰钒氮成分设计。C含量的提高能够显著提高强度和脆性,改善胀断性能,形成珠光体+铁素体组织,因此最终碳含量控制在0.65~0.75%;锰是弱碳化物形成元素,它可以降低奥氏体转变温度,细化铁素体晶粒,对提高强度和韧性有益,因此,在成分设计时,锰含量设计按0.40~0.80%,但Mn当含量超过0.80%时,中心偏析加重,造成延伸性能降低。采用V-N微合金复合强化能有效显著提高强度胀断性能,V含量设计按:0.03%-0.10%,N含量设计按0.010%~0.020%。适当增加P含量,利用P元素在奥氏体晶界的偏聚降低奥氏体晶界强度和P元素的固溶强化,降低其塑性,提高胀断性能P含量素设计按0.020~0.040%。改善钢的切削性能,适当增加S含量,S含量设计0.050%~0.100%。
本发明在成分设计上具有珠光体+铁素体组织,高强度、高硬性、良好的切削等性能,能够很好的满足汽车连杆的胀断使用需求。
本发明的有益效果:(1)本发明自创高碳高锰钒氮复合强化、LF精炼技术、VD炉真空脱气,适当提高S含量和钢水的纯净度,成功开发珠光体+铁素体组织的胀断连杆用热轧圆钢,其代表钢种C70S6规格为30~100mm,热轧抗拉强度在800~1000MPa,屈服强度在550~800MPa,延伸率在10%以上,常温冲击AKV在34J以上,能够很好的满足汽车胀断连杆用钢材的使用需求;(2)本发明利用钢厂现有设备和工艺条件,既不增加投资和生产成本,又提高了生产效率,节能减耗;(3)本发明的产品组织为珠光体+铁素体组织,具有高强度、高硬性、良好的切削性能、冲击性能等,能够很好的满足汽车连杆的胀断使用需求。
附图说明
图1为本发明实施例1的代表钢种C70S6的100X热轧态金相组织图,金相组织为珠光体+铁素体。
图2 为本发明实施例1的代表钢种C70S6的夹杂物照片,夹杂物为A3.5。
具体实施方式
下面结合实施例对本发明的内容作进一步说明。
实施例1:一种胀断连杆用热轧圆钢的生产
钢的化学组成重量百分比为C=0.68%,Si=0.18%,Mn=0.56%,P=0.025%,S=0.060%,Al≤0.005%,Ni=0.06%,Cr =0.14%,V=0.035%,N:=0.015%,其余为Fe和不可避免的杂质;关键工艺步骤包括:
(1)转炉冶炼:终点C:0.09%,P :0.013%;高拉补吹后吹次数1次;出钢1/4时往钢包中加入合金。
(2)LF精炼:钢水在LF炉通电时间28min,总吹氩时间52 min;过程使用Al粒60Kg+SiC120Kg扩散脱氧;15min成白渣,精炼中后期采用150Kg酸性调渣剂,终渣碱度4.7;S≤0.004%、温度1605℃后使用200KGVN合金增氮,出站喂N线500m;喂Ca线100m,间隔5min后喂S线650m增S。
(3)RH真空处理:总吹氩时间33 min,保真空时间10min;破空后软吹氩时间18min,定 [H] 1.2ppm。
(4)连铸:采用全程保护浇注,使用整体包水口+中包使用覆盖剂进行钢水保护浇注,过热度22℃~29℃,拉速0.85m/min;液面波动±3mm;结晶器电磁搅拌参数:电流强度250A、频率2.5HZ,末端电磁搅拌参数:电流强度300A、频率8HZ;铸坯凝固末端多点重压下12mm;铸坯尺寸:280*280*mm*6m。
(5)加热:铸坯加热温度1170~1190℃之间,在炉时间270min。
(6)轧制:终轧温度控制在1010℃;高压水除鳞压力27MPa;轧后冷床保温罩冷却,直至冷却温度到400~500℃之间时入缓冷坑保温,保温时间27h。
圆钢力学性能见表1所示。
实施例2:一种胀断连杆用热轧圆钢的生产
钢的化学组成重量百分比为C=0.70%,Si=0.20%,Mn=0.58%,P=0.028%,S=0.065%,Al≤0.008%,Ni=0.08%,Cr =0.16%,V=0.032%,N=0.017%,其余为Fe和不可避免的杂质;关键工艺步骤包括:
(1)转炉冶炼:终点C:0.10%,P :0.017%;高拉补吹后吹次数1次;出钢1/4时往钢包中加入合金。
(2)LF精炼:钢水在LF炉通电时间31min,总吹氩时间63 min;冶炼过程使用Al粒80Kg+SiC70Kg扩散脱氧;15min成白渣,精炼中后期采用90Kg酸性调渣剂,终渣碱度5.2;S≤0.004%、温度1595℃后使用120KGVN合金增氮,出站喂N线300m;喂Ca线80m,间隔5min后喂S线350m增S。
(3)RH真空处理:总吹氩时间33 min,保真空时间10min;破空后软吹氩时间18min,定 [H] 1.2ppm。
(4)连铸:采用全程保护浇注,使用整体包水口+中包使用覆盖剂进行钢水保护浇注,过热度20℃~33℃,拉速0.85m/min;液面波动±4mm;结晶器电磁搅拌参数:电流强度350A、频率2.5HZ,末端电磁搅拌参数:电流强度350A、频率8HZ;铸坯尺寸:280*280*mm*6m。
(5)加热:铸坯加热温度1188~1205℃之间,在炉时间210min。
(6)轧制:终轧温度控制在1020℃;高压水除鳞压力25MPa。轧后直接冷床冷却,直至冷却温度到400~500℃之间时入缓冷坑保温,保温时间28h。
圆钢力学性能见表1所示。
实例3:一种胀断连杆用热轧圆钢的生产
钢的化学组成重量百分比为C=0.66%,Si=0.23%,Mn=0.60%,P=0.020%,S=0.053%,Al≤0.005%,Ni=0.04%,Cr =0.13%,V=0.042%,N:=0.018%,其余为Fe和不可避免的杂质;关键工艺步骤包括:
(1)转炉冶炼:终点C=0.08%,P=0.014%,;高拉补吹后吹次数1次;出钢1/4时往钢包中加入合金。
(2)LF精炼:钢水在LF炉通电时间24min,总吹氩时间57 min。冶炼过程使用Al粒50Kg+SiC100Kg扩散脱氧;19min成白渣,精炼中后期采用140Kg酸性调渣剂,终渣碱度5.1;S≤0.004%、温度1608℃后使用420KGVN合金增氮,出站喂N线550m;喂Ca线100m,间隔5min后喂S线680m增S。
(3)RH真空处理:总吹氩时间35 min,保真空时间10min;破空后软吹氩时间17min,定 [H] 1.2ppm。
(4)连铸:采用全程保护浇注,使用整体包水口+中包使用覆盖剂进行钢水保护浇注,过热度20℃~27℃,拉速0.85m/min;液面波动±4mm;结晶器电磁搅拌参数:电流强度250A、频率2.5HZ,末端电磁搅拌参数:电流强度300A、频率8HZ;铸坯凝固末端多点重压下12mm;铸坯尺寸:280*280*mm*6m。
(5)加热:铸坯加热温度1165~1185℃之间,在炉时间330min。
(6)轧制:终轧温度控制在1030℃;高压水除鳞压力26MPa;轧后冷床保温罩冷却,直至冷却温度到350~400℃之间时入缓冷坑保温,保温时间30h。
圆钢力学性能见表1所示。
表1 实施例中圆钢的力学性能
从表1测试结果可见,采用本发明的方法生产的一种胀断连杆用热轧圆钢,当规格为88mm、80mm、90mm时,屈服强度分别为631Mpa、646 Mpa、627 Mpa,抗拉强度分别为936Mpa、959 Mpa、933 Mpa,延伸分别为22%、21%、23%,面缩分别为12.5%、11.5%、13.5%;热轧硬度分别为252、250、255、258、250、255 HBW;该一种胀断连杆用热轧圆钢具有高强度、高硬性、良好的切削等性能,能够很好的满足汽车连杆的胀断使用需求。
Claims (1)
1.一种胀断连杆用热轧圆钢的生产方法,采用的工艺路线为转炉冶炼—LF精炼—RH真空处理—连铸—加热—轧制,其特征在于:钢的化学组成重量百分比为C=0.65%~0.75%,Si=0.10%~0.30%,Mn=0.40~0.80%,P=0.020~0.040%,S=0.050%~0.100%,Al≤0.020%,Ni=0.05%~0.25%,Cr =0.10%~0.20%,V= 0.03%-0.10%,N:=0.010%~0.020%,其余为Fe和不可避免的杂质;关键工艺步骤包括:
(1)转炉冶炼:终点控制目标C≥0.08%、P≤0.025%;出钢1/4时顺钢流加入脱氧剂、合金和渣料;
(2)LF精炼:钢水在LF炉通电时间≥20min,总吹氩时间≥45 min;冶炼过程使用Al粒进行扩散脱氧;快速造渣脱氧、脱硫,快速成渣,精炼中后期采用酸性调渣剂调整终渣碱度4.0±1.0;当S≤0.005%、温度≥1580℃后使用VN合金增氮+出站前补喂N线控氮;喂Ca线70~100m,间隔5min后喂S线增S;
(3)RH真空处理:总吹氩时间≥30min,采用真空环流氮气,保持时间≥8min、软吹氩时间≥15min;钢水出站上连铸台温度按中包过热度目标值连浇炉≤35℃,开浇炉≤40℃控制;
(4)连铸:采用全程保护浇注,使用整体包水口进行浇注,中包使用无碳覆盖剂进行钢水保护浇注,中包过热度15℃~35℃,结晶器液面波动≤±5mm,使用结晶器电磁搅拌+末端电磁搅拌
(5)加热:铸坯均热温度控制在1180~1220℃,方坯加热时间180~420min;
(6)轧制:开轧温度控制在1050~1100℃,出炉开启高压水除鳞压力≥24MPa,圆钢采用冷床保温罩+入坑缓冷。
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