应用铁素体区热轧工艺开发超低碳热轧深冲板

研究了铁素体轧制工艺条件对一种Ti-IF钢的性能,特别是深冲性能的影响.采用铁素体区润滑轧制和高温卷取,r值最高为1.38,延伸率达到50%以上.而奥氏体轧制条件下r值低于1.0.织构分析证实在润滑轧制条件下,强的{111}再结晶织构沿厚度方向较均匀分布,剪切织构较弱,而在无润滑轧制条件下,{111}再结晶织构很弱,并且形成了较强的{110}剪切织构.为获得具有良好深冲性能的热轧板,要求加热温度在1 100-1 150℃之间,终轧温度在750-800℃之间, 卷取温度大于650℃.

Developing an Ultra-Low Carbon Deep-Drawing Sheet Steel by Ferritic Hot Rolling Process

How the processing conditions affect the properties especially the drawability of a ferritic hot-rolled and annealed Ti-IF sheet steel was investigated. With the sample workpieces lubricated during ferritic rolling and coiled at high temperature, the maximum plastic strain ratio of sample was 1.38 with elongation over 50%. For the samples rolled with lubricating interity further annealed, the strong {111} recrystallization texture presents uniform distribution in thickness direction with low of {110} recrystallization texture even in surface layer. However, under unlubricated rolling conditions, the weak {111} texture presents ununiform distribution with high intensity of {110} recrystallization texture especially in surface layer. To acquire the deep drawability, the reheating temperature, finished temperature and coiling temperature should be 1100-1150°C, 750-800°C and over 650°C, respectively.