通过TMCP试验,研究了不同Nb含量低碳FB钢的微观组织和扩孔性能.试验结果表明,随着终轧温度或卷取温度的降低,试验钢强度提高,而扩孔性能降低.随着Nb含量的增加,试验钢的抗拉强度与扩孔性能明显改善.当终轧温度控制在860℃,冷却中间温度在710℃,卷取温度在450℃时,Nb的质量分数约为0.02%的试验钢的铁素体晶粒尺寸细化到6.3 μm,抗拉强度达到570 MPa,扩孔率为91%左右,获得了良好的综合性能.
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