卷取温度、冷轧压下量对低碳铝镇静钢SPHC力学性能及成形性的影响

研究了低碳铝镇静钢SPHC（/%：0.04C,0.03Si,0.14Mn,0.027Al）572~648 ℃卷取温度以及冷轧压下量65%~75%对该钢700 ℃退火性能的影响。结果表明，在相同的冷轧压下量下，随着卷取温度的增加,强度基本呈现下降趋势,伸长率相对有所上升,n、r值基本呈下降趋势;在相同的卷取温度下，随着冷轧压下量的不断增加，强度呈现下降趋势,伸长率先升后降,n、r值基本呈先升后降的趋势。热轧卷取温度620 ℃，冷轧变形量70%时，700 ℃退火3 mm SPHC钢板性能达到最佳，即抗拉强度286 MPa，屈服强度210 MPa，伸长率43%，n值0.27，r值1.52。

Effect of Coiling Temperature and Cold Rolling Reduction on Mechanical Properties and Formability of Low Carbon Al Killed Steel SPHC

The effect of coil temperature 572～648 ℃ and cold rolling reduction 65%~75% on properties of the low carbon   aluminum   killed   steel   SPHC(/%:0.04C,0.03Si,0. 14Mn,0.027Al)annealed   property   at   700   ℃   has   been   studied. The results  show that at the  same cold rolling reduction,with the increase of coiling temperature,the  strength of steel basically presents a downward trend,the elongation relatively increases,and the n and r values basically show a downward trend;  at  the  same  coiling  temperature,with  the  increase  of cold  rolling  reduction,the  strength  basically  presents  a  downward trend,the elongation first increases and then decreases,and the n and r values basically show first increases and then decreases downward trend. By comparison,the best performance of 3 mm SPHC steel plate annealed at 700 ℃ can be obtained by  hot  rolling  coiling  at  620  ℃ and  cold  rolling  deformation  70%,that  is  tensile  strength  286  MPa,yield  strength 210  MPa, elongation 43%, n-value 0.27, r-value 1.52.