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研究了连续退火均热段温度和平整工艺对冷轧超低碳BH钢的组织和力学性能的影响规律。结果表明,超低碳BH钢在740～850℃之间均能完成再结晶退火,且随着均热段温度的升高,BH钢的屈服强度和抗拉强度单调下降,n值单调上升;伸长率和r值先上升后下降,并同在820℃左右达到峰值;显微硬度也呈单调下降趋势。平整伸长率由0向1.8%增加过程中,钢板的强度呈下抛物线形变化;低于0.8%时会产生屈服平台;高于1.5%时,加工硬化加剧导致强度快速上升,屈服强度可在1.2%～1.5%之间达到最低值。
The influence of the temperature of the soaking zone by continuous annealing and the formation process on the microstructure and mechanical properties of cold-rolled ultra-low carbon BH steel was studied. The results show that the recrystallization annealing of ultra - low carbon BH steel can be completed at 740 ~ 850 ℃. With the increase of the soaking temperature, the yield strength and tensile strength of BH steel decrease monotonically and the value of n monotonically increases. Elongation and r value first increased and then decreased, and peaked at about 820 ℃. The microhardness also showed a monotonous decreasing trend. Flattening elongation increased from 0 to 1.8% in the course of the parabolic curve of the strength of the steel sheet; below 0.8% yields a yield plateau; above 1.5%, higher work hardening results in a rapid increase in strength and the yield strength can be found in 1.2% ~ 1.5% reached the lowest value.