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根据汽车板对焊接性、成形性和涂镀性的要求,提出了在低碳低硅成分设计的基础上开发冷轧热镀锌用800MPa级高强度汽车用双相钢的基本思想,并通过合金元素Mo、Cr、Nb提高钢的淬透性和细化铁素体晶粒来达到设计力学性能。研究了Cr、Nb、Mo对低碳低硅双相钢组织和性能的影响,运用合金化设计和工艺设计配合的技术思想,使实验钢达到了强度要求。同时,在分析低碳低硅冷轧双相钢成分特点的基础上,提出了高强度冷轧镀锌双相钢的成分控制和冶炼工艺要求。
According to the requirements of automotive sheet on weldability, formability and coating properties, the basic idea of developing dual-phase steel for 800MPa high-strength automobile for cold-rolled hot-dip galvanizing based on low-carbon and low-silicon composition design was proposed and adopted Alloying elements Mo, Cr, Nb improve the hardenability of steel and refine the ferrite grains to achieve the design mechanical properties. The effects of Cr, Nb and Mo on the microstructure and properties of low carbon and low silicon dual phase steel were studied. The technical idea of alloying design and process design was adopted to make the experimental steel meet the strength requirements. At the same time, based on the analysis of the characteristics of low-carbon and low-silicon cold-rolled dual-phase steel, the composition control and smelting process requirements of high strength cold-rolled galvanized dual-phase steel are proposed.