580 MPa级热轧高扩孔钢开发  

Development of 580 MPa Hot-rolled High Expansion Hole Steel

作　　者：郭隆 Guo Long(Technical Center,Tangshan Iron and Steel Group Co.,Ltd.,Tangshan Hebei 063200,China)

机构地区：[1]唐山钢铁集团有限责任公司技术中心,河北唐山063200

出　　处：《山西冶金》2025年第2期66-67,共2页Shanxi Metallurgy

摘　　要：采用了一种Nb、Ti复合成分进行了热轧580 MPa级高扩孔钢的冶炼及浇铸,通过控轧控冷工艺完成了卷板产品的生产,并对产品进行了组织及性能检测。结果表明,一定含量Nb+Ti复合的微合金高扩孔钢显微组织为铁素体+贝氏体双相组织,具有抗拉强度623 MPa、屈服强度493 MPa、A_(50mm)=31.7%、扩孔率为112%的良好综合性能。A Nb Ti composite composition was used for the smelting and casting of hot-rolled 580 MPa grade high expansion steel.The production of coil products was completed through controlled rolling and cooling processes,and the microstructure and properties of the products were tested.The results show that the microstructure of a certain content of Nb+Ti composite microalloyed high expansion steel is a ferrite+bainite dual phase structure,with a tensile strength of 623 MPa and a yield strength of 493 MPa A_(50mm)=31.7%,good comprehensive performance with a hole expansion rate of 112%.

关 键 词：Nb+Ti复合 铁贝双相 分段冷却 

分 类 号：TG142.1[一般工业技术—材料科学与工程]