应用铁素体区热轧工艺开发超低碳热轧深冲板

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

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℃.

How the processing conditions affect the properties especially the drawability of a ferritic hot-rolled and annealed TiIF 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℃, 750～800℃ and over 650℃, respectively.