253MA耐热不锈钢EAF-AOD-LF-板坯连铸生产工艺实践  

EAF-AOD-LF-Slab Casting Process Practice of Heat Resistance Stainless Steel 253MA

作　　者：刘睿智[1] 谭建兴 闫建新[1] 武鹏[1] 谢恩敬 王昕 姚吕金 卫敏 Liu Ruizhi;Tan Jianxing;Yan Jianxin;Wu Peng;Xie Enjing;Wang Xin;Yao lüjjin;Wei Min(Nol Steelmaking Works,Shanxi Taigang Stainless Steel Co Ltd,Taiyuan 030003)

机构地区：[1]山西太钢不锈钢股份有限公司一炼钢厂,太原030003

出　　处：《特殊钢》2020年第2期40-42,共3页Special Steel

摘　　要：253MA钢(/%:0.05~0.10C,1.2~2.0Si,20~22Cr,10~12Ni,0.14~0.20N,0.03~0.08Ce)是在21Cr-11Ni不锈钢的基础上,通过N合金化和添加稀土元素Ce开发的耐热奥氏体不锈钢。由于该钢种的熔点偏低,钢液的流动性差。因此,氮气合金化、稀土合金化是冶炼过程中的工艺难点。通过对稀土加入方式、过程脱氧、以及精确控N模型等研究,采用AOD全程氮气搅拌,AOD出钢前按照1.8~2.2 m^3/t钢吹氩降氮,钢中[O]可降低到15×10^-6~20×10^-6,LF按13 m/t钢喂入铈线,实现了253MA不锈钢的批量生产。Based on 21Cr-11Ni stainless steel,steel 253 MA(/%:0.05~0.10C,1.2~2.0Si,20~22Cr,10~12Ni,0.14~0.20N,0.03~0.08Ce) as a heat resistance austenite stainless steel is developed by adding nitrogen and Ce.Because of low melting point of this steel,the fluidity of molten steel is poor.Consequently,the addition of nitrogen and Ce is a difficult problem.The adding RE method,the deoxidization proceses and the model for N2 content control are studied.With process measures including using N2 stirring in whole AOD process and using Ar stirring 1.8~2.2 m^3/t before AOD taping to decrease nitrogen,and decreasing [O] to 15 × 10^-6~20 × 10^-6,and feeding Ce coils 13 m/t in the steel at LF,the 253MA stainless steel can be produced commercially.

关 键 词：氮合金化 稀土合金化 253MA不锈钢 

分 类 号：TF764.1[冶金工程—钢铁冶金] TF777.1