通过对00Cr17Ti经热带退火、不经热带退火两种工艺的冷轧板进行对比试验,在分析显微组织、织构的基础上,研究了热带退火对00Cr17Ti薄板表面皱折的影响。研究结果表明:与不经热带退火相比,经热带退火能使成品薄板的表面皱折大大减轻,最大粗糙度仅为12.06μm,平均粗糙度仅为1.27μm。两种工艺的成品板表面皱折程度的不同是由两者在显微组织、微织构上的差异造成的。与不经热带退火相比,经热带退火的成品薄板在板厚方向具有较均匀的组织,板宽方向的织构梯度较小,晶粒簇较间断、细窄、分散,所有这些使得成品薄板的表面皱折大大减轻。为了满足用户对薄板表面质量的严格要求,对热轧带进行退火是很有必要的。
Comparative experiments of 00Cr17Ti cold-rolled sheets with or without hot band annealing were carried out. The effect of annealing of hot band on ridging of cold-roiled and annealed sheet was investigated by microstructure and texture analysis. The results show that the cold-rolled and annealed sheet with annealing of hot band exhib- ited slighter ridging than that without annealing, and the average roughness and maximum roughness were only 1.27 μm and 12.06 μm, respectively. The difference in ridging characteristics between these two sheets mainly derived from the difference in microstructure and micro-texture. The cold-rolled and annealed sheet from annealed hot band had more homogenous microstructure in normal direction (ND) and lower texture gradient in transverse direction (TD) in comparison with that without annealing of hot band. Moreover, the grain colonies of the cold-rolled and annealed sheet from annealed hot hand were shorter, thinner and more scattered. All that reduced ridging of the finished sheet. Thus annealing of hot-rolled band is essential to improve the surface quality of finished sheet.