The invention relates to 980 MPa grade low carbon cold rolled dual phase steel and a preparation method thereof, belonging to the technical field of high strength steel for automobiles. The technical problem solved by the invention is that the existing 980 MPa grade cold rolled dual phase steel has high production cost and difficult production. The cold-rolled low-cost ultra-high strength dual-phase steel and its preparation method have the chemical composition mass percentage of C:0.05-0.10%, Si:0.30-0.70%, Mn:2.00-2.50%, Cr:0.40-0.80%, Al:0.01-0.06%. The molten iron V content is controlled in the converter, and 980 MPa low carbon cold-rolled dual-phase steel is obtained by hot rolling, acid rolling and annealing processes. The duplex steel of the invention has excellent mechanical properties and forming properties, obvious cost advantages, and remarkable economic and social benefits.
【技术实现步骤摘要】
980MPa级低碳冷轧双相钢及其制备方法
本专利技术属于汽车用高强钢
,具体涉及980MPa级低碳冷轧双相钢及其制备方法。
技术介绍
随着汽车轻量化技术的发展,汽车用钢朝着高强钢方向发展已成为必然趋势。双相钢具有低屈服强度、高抗拉强度和优良塑性等特点,成为汽车用首选高强钢,其用量预计在汽车用先进高强钢中将超过70%。随着国内汽车板产能的不断释放,高强钢市场的竞争也越来越激烈,低成本高性能的双相钢已经成为各企业追求的目标,受到极大关注。专利文献CN102828119A公开了高弯曲型980MPa级冷轧双相钢及制备工艺,其优选化学成分百分比为:C:0.17~0.19%,Si:0.50~0.70%,Mn:1.80~2.00%,Cr:0.30~0.60%,Nb:0.04~0.06%,余量为Fe及不可避免杂质;通过740-840℃保温、640-760℃缓冷、170-400℃过时效处理,得到了抗拉强度大于980MPa的冷轧双相钢。尽管通过其化学成分和生产方法制备的冷轧双相钢具有优良的力学性能,但其焊接性能(较高碳含量)和高轧制难度(Nb抑制奥氏体动态再结晶)是其主要弱点。 ...
【技术保护点】
1.980MPa级低碳冷轧双相钢,其特征在于:其化学成分质量百分比为C:0.05~0.10%,Si:0.30~0.70%,Mn:2.00~2.50%,Cr:0.40~0.80%,Al:0.01~0.06%,V:0.05~0.15%,P≤0.020%,S≤0.010%,N≤0.006%,余量为Fe及不可避免杂质。
【技术特征摘要】
1.980MPa级低碳冷轧双相钢,其特征在于:其化学成分质量百分比为C:0.05~0.10%,Si:0.30~0.70%,Mn:2.00~2.50%,Cr:0.40~0.80%,Al:0.01~0.06%,V:0.05~0.15%,P≤0.020%,S≤0.010%,N≤0.006%,余量为Fe及不可避免杂质。2.根据权利要求1所述的980MPa级低碳冷轧双相钢,其特征在于:其化学成分质量百分比为C:0.06~0.08%,Si:0.40~0.60%,Mn:2.20~2.50%,Cr:0.60~0.80%,Al:0.02~0.05%,V:0.05~0.10%,P≤0.015%,S≤0.005%,N≤0.005%;余量为Fe及不可避免杂质。3.根据权利要求1或2所述的980MPa级低碳冷轧双相钢,其特征在于:所述双相钢的微观组织主要由铁素体和马氏体组成。4.根据权利要求1~3任一项所述的980MPa级低碳冷轧双相钢,其特征在于:所述双相钢屈服强度为570~650MPa,抗拉强度为1000~1080MPa,伸长率为10.0~15.0%。5.980MPa级低碳冷轧双相钢的制备方法,其特征在于包括如下步骤:根据权利要求1或2所述的化学成分质量百分比进行冶炼...
【专利技术属性】
技术研发人员:邝春福,郑之旺,周三保,张劲超,
申请(专利权)人:攀钢集团攀枝花钢铁研究院有限公司,
类型:发明
国别省市:四川,51
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