以充分挖掘材料潜力提高中厚板质量为目标,开展了普碳钢中厚板表层组织超细化轧制工艺研究.单向压缩热模拟试验结果表明,在适当条件下,化学成分为w(C)0.16%、w(Si)0.19%、w(Mn)0.56%的普碳钢,可发生形变诱导奥氏体-铁素体相变并获得超细晶粒铁素体.实验室轧制9 mm钢板的铁素体晶粒度达到11级(约7μm),与热模拟试验的结果相一致,屈服强度达到350 MPa.在首钢3 500 mm轧机上,采用化学成分为w(C)0.13%～0.16%、w(Si)0.20%～0.25%、w(Mn)0.5%～0.7%、w(P)0.01%～0.02%、w(S)0.005%～0.010%的连铸坯进行工业试制.28 mm厚钢板的表层铁素体晶粒度达到12级,屈服强度达到310～321 MPa,抗拉强度达到440～450 MPa,同时保持34%左右的伸长率.
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