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针对汽车冲压零部件对冷轧带钢提出的低屈服强度、高伸长率、低成本的要求,采用降低钢中碳质量分数至0.010%~0.030%、适当添加B元素(质量分数0.001 5%~0.002 5%)的微碳钢,并采取U形卷取温度控制、高温卷取和连续退火等措施,微碳钢成品钢卷屈服强度下降到180 MPa以下的占比达95%以上,产品性能满足汽车零部件冲压要求。
Aiming at the low yield strength, high elongation and low cost requirements of cold stamping steel for automotive stamping parts, the method of reducing the mass fraction of carbon in steel to 0.010% ~ 0.030%, adding B element (mass fraction 0.001% ~ 0.002 5%). Take U-shaped coiling temperature control, high-temperature coiling and continuous annealing and other measures, the yield strength of the finished product of micro-carbon steel products dropped below 180 MPa accounted for more than 95% Performance to meet the automotive parts stamping requirements.