冷轧冲压用钢SPHC热轧工艺研究

SPHC作为冷轧冲压用钢的原料,要求良好的冲压成型性,拉伸和弯曲性能以及较低的屈服强度,主要通过控制AlN在热轧过程中的固溶和析出,在随后的退火再结晶过程中促进γ纤维织构(<111>∥ND)的发展从而获得良好的冲压性能。退火工艺不同,热轧工艺也有所不同,对罩式退火,采用"三高一低"温度制度,对于连续退火,则采取低温加热、高温终轧以及高温卷取的工艺制度。

STUDY ON HOT ROLLING PROCESS OF SPHC COLD STAMPING STEEL

SPHC for cold stamping requires good formability,tensile and bending properties,as well as lower yield stress.Good formability can be achieved through controlling AlN solid solution and precipitation during hot rolling,promoting the γ fiber texture（111∥ND）development in the subsequent annealing recrystallization.Different annealing process requires different hot rolling process e.g.the three high and one low temperature system for batch annealing and the low heating,high-temperature finishing rolling and coiling process system for continuous annealing.