基于屈服平台理论消除酸洗板SPHC表面横折印缺陷的实践  

Practice of Eliminating Cross Break Defects on the Surface of SPHC Pickling Plate Based on the Yield Point Elongation Theory

作　　者：岳重祥 李霞 王平 朱阳林 李化龙 YUE Chongxiang;LI Xia;WANG Ping;ZHU Yanglin;LI Hualong(Institute of Research of Iron and Steel,Shasteel,Zhangjiagang 215625,China;Chief Engineer Office,Jiangsu Sha Steel Group,Zhangjiagang 215625,China)

机构地区：[1]江苏省(沙钢)钢铁研究院,江苏张家港215625 [2]江苏沙钢集团有限公司总工办,江苏张家港215625

出　　处：《材料科学与工程学报》2020年第2期256-261,共6页Journal of Materials Science and Engineering

基　　金：江苏沙钢集团有限公司合作资助项目(TP1420SS)。

摘　　要：酸洗板SPHC拉伸曲线存在屈服平台,并存在明显的上下屈服点是其表面易产生横折印缺陷的内在原因,开卷过程中钢板表面受力不均匀是其表面产生横折印缺陷的外在原因。基于屈服平台理论,本文采用工业试验方法,在SPHC中添加微量合金元素B、Ti,研究B、Ti微合金化对SPHC钢屈服现象的影响。结果表明,在SPHC钢中同时添加微量B和Ti,可以在不显著增加生产成本的前提下,减弱屈服现象,将上下屈服平台差控制在10MPa以内。对酸洗板SPHC进行B、Ti微合金化成分设计,配合合理热轧工艺,实践生产厚规格(4~6mm)酸洗板SPHC超过15万吨,性能优良,表面横折印缺陷判次率低于0.3%。Yield point elongation and obvious upper and lower yield point can be observed in the tensile curve of SPHC pickling plate,which is the immanent cause of the cross break defects on the surface.On the other hand,uneven deformation during the uncoiling process is the external cause of the defects.Based on the yield point elongation theory,industrial tests were performed to study the influence of B,Ti microalloying on the yield performance of the SPHC steel in this paper.Results show that co-addition of B and Ti weakens the yield point elongation and narrows the gap of the upper and lower yield strength into 10 MPa while the production cost is not increased significantly.More than 150 thousand tons of the SPHC pickling plates with thickness 4~6 mm were produced using the reasonable hot rolling process and the new content with addition of trace element B and Ti.The results shows the plates have good performance and less than 0.3%of the products were confirmed unqualified due to the defects.

关 键 词：SPHC 屈服平台 横折印 微合金化 

分 类 号：TG142.1[一般工业技术—材料科学与工程]