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1前言热轧DP钢相对于冷轧DP钢省去了热处理过程,工序简单,尤其是C-Si-Mn系热轧DP钢不用添加Cr、Mo等贵重合金元素,成本降低,而强塑性比热处理DP钢更好,因此日益引起重视。通过采用合理的化学成分及合适的生产工艺,薄板坯连铸连轧生产线(CSP)流程可以批量生产抗拉强度不低于540MPa级热轧DP钢,所开发的钢种具有屈强比低、伸
1 Preface Hot-rolled DP steels save the heat treatment process compared with cold-rolled DP steels, and the process is simple. Especially the hot-rolled DP steels without C-Si-Mn hot-dip DP require expensive alloy elements such as Cr and Mo to reduce the cost, DP heat treatment is better, so more and more attention. By adopting reasonable chemical composition and suitable production technology, the thin slab continuous casting and rolling line (CSP) can mass produce hot-rolled DP steel with a tensile strength not lower than 540MPa. The developed steel has the advantages of low yield ratio, stretch