304不锈钢圆坯凝固组织优化  

Solidification Structure Optimization of 304 Stainless Steel

作　　者：吴庆瑜[1] 赵静[1] 吕俊杰 赵紫玉[1] Wu Qingyu1, Zhao Jing1, Lu Junjie2, Zhao Ziyu1(1. School of Metallurgical Engineering, Tangshan Vocational College of Science and Technology, Tangshan 063001, Hebei , China ;2. Long Products Department of Tangshan Iron and Steel Corporation, Hebei Iron and Steel Group,Tangshan 063016, Hebei, Chin)

机构地区：[1]唐山科技职业技术学院冶金工程系,河北唐山063001 [2]河北钢铁集团唐钢长材部,河北唐山063016

出　　处：《钢铁钒钛》2018年第1期124-129,共6页Iron Steel Vanadium Titanium

摘　　要：为了解决304奥氏体不锈钢连铸圆坯穿管开裂问题，进行了化学成分优化、使用末端电磁搅拌并合理控制过热度试验。试验结果表明：通过优化钢成分，使铸坯心部组织中的δ铁素体面积分数由原来的8.6%降低至7.2%。优化成分后使用末端电磁搅拌使铸坯心部组织中的δ铁素体面积分数降低至5.8%，而且分布比较分散，未使用末端电磁搅拌的铸坯心部δ铁素体呈网状。过热度为30～40 ℃时对降低钢中δ铁素体含量有利。采取以上措施使304铸坯心部的δ铁素体含量明显降低，穿管开裂现象明显改善。In order to reduce the crack of 304 austenitic stainless steel pipe, the experiments of composi- tion optimization, F-EMS and superheat controlling have been done to optimize solidification structure. The area fraction of 6 ferrite in structure of billet center decreases from 8.6 % to 7.2 % through composition optimization. By implement of F-EMS, The area fraction of 6 ferrite in structure of billet center de- creases to 5.8 % and distributes dispersively, the 6 ferrite in the billet without F-EMS is net-like. The superheat between 30℃ and 40 ℃ is beneficial to reduce 8 ferrite. The amount of 8 ferrite in 304 billets decreases significantly by using above measures and the crack during piercing is improved significantly.

关 键 词：304不锈钢 凝固组织 末端电磁搅拌 过热度 成分优化 

分 类 号：TF76[冶金工程—钢铁冶金]