不锈钢工艺控制及成品板缺陷形成机理研究-钢铁钒钛.PDFVIP

第33卷第5期 钢摇 铁摇 钒摇 钛 Vol郾33,No郾5 2012年10月 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 IRON STEEL VANADIUM TITANIUM 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 October2012 321不锈钢工艺控制及成品板缺陷 形成机理研究 1,2 2 2 2 王建泽 ,唐兴昌 ,胡伟华 ,康永林 (1. 酒泉钢铁公司不锈钢厂,甘肃 嘉峪关735100;2. 北京科技大学材料科学与工程学院,北京 1 摘摇 要:介绍了某钢厂炉卷轧机生产321不锈钢的化学成分设计、生产工艺控制和成品板的力学性能,并利用光学 显微镜、扫描电镜对生产的321不锈钢夹杂物形貌及成品板表面缺陷进行了观察与分析。 结果表明:炉卷轧机生 产的321不锈钢力学性能优良,表面质量较好,其主要的表面缺陷为线鳞,是由于连铸坯中TiN夹杂物大量聚集造 成的。 控制影响夹杂物产生的Ti、Al、N、O等元素含量,设置合理的LF炉吹氩搅拌参数,控制浇注时的过热度等措 施可有效改善321不锈钢成品板的表面质量。 关键词:321不锈钢;工艺控制;夹杂物;表面缺陷;线鳞 中图分类号:TF764,TG115摇 摇 文献标识码:A摇 摇 文章编号:1004-7638(2012)05-0080-05 Process Control and Defect Formation Mechanism of321 Stainless Steel 1,2 2 2 2 Wang Jianze ,Tang Xingchang ,Hu Weihua ,Kang Yonglin (1. Stainless SteelPlant,JiuquanIronandSteelCo. ,Ltd. ,Jiayuguan735100,Gansu,China;2. Schoolof MaterialSci鄄 ence and Engineering,University of Science and Technology Beijing,Beijing 100083,China) Abstract:The technical features of 321 stainless steel produced by steekle mill were introduced in this paper,including itsalloying design,processcontrol and mechanical properties. Morphology of the inclu鄄 sions and thesurfacedefectsofthesteelwereanalyzedby OMandSEM. Theresultsshowedthatthe321 stainless steel exhibitsexcellent mechanicalproperty andgood surfacequality. Themain surfacedefect is linear scale,which is caused by the mass clustering of TiN grains in the continuously cast bloom. In or鄄 der to effectively improve the surface quality of the steel,some measures can be taken,including control鄄 ling contents of elements such asT