ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2016, Vol. 37 ›› Issue (3): 46-49.

• 组织和性能 • 上一篇    下一篇

超纯铁素体不锈钢B439M 200 mm x1260 mm连铸板坯中TiN夹杂物的分布

沈中芳1,段豪剑2,张立峰2   

  1. 1宝钢不锈钢有限公司,上海200431 ;
    2北京科技大学冶金与生态工程学院,北京100083
  • 收稿日期:2015-12-25 出版日期:2016-06-01 发布日期:2022-08-04
  • 作者简介:沈中芳(1960-),男,硕士(1997年上海大学),高级工程师, 1983年上海工业大学(本科)毕业,冶金工程研究。

Distribution of TiN Inclusions in 200 mm x 1260 mm Cast Slab of Ultra-Pure Ferrite Stainless Steel B439M

Shen Zhongfang1, Duan Haojian2,Zhang Lifeng2   

  1. 1 Baosteel Stainless Steel Co Ltd, Shanghai 200431 ;
    2 School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing 100083
  • Received:2015-12-25 Published:2016-06-01 Online:2022-08-04

摘要: 采用自动扫描电镜Aspex研究了超纯铁素体不锈钢B439M(/%:0.01C,0.40Si,0.25Mn,0.020P,0.001S,17.50Cr,0.15Ni,0.20Ti,0.0080N,0.0040O)200 mm×1260 mm连铸板坯中TiN夹杂物的分布,结果表明,由于连铸坯凝固过程中由外向内冷却速率减小,在连铸坯宽度方向边部,生成了大量小尺寸(平均1.26μm‎)TiN夹杂物;而在连铸坯宽度方向的1/4处和中部,由内弧表面到厚度1/4处再到厚度方向中部,TiN形核速率降低,TiN夹杂物的数量减少而尺寸增大。动力学分析结果得出,冷却速率减小会使得TiN夹杂物的生成尺寸增大,与TiN夹杂物在连铸坯中的分布规律相吻合。

关键词: 超纯铁素体不锈钢B439M, 200 mmx1260rmn连铸板坯,TiN夹杂物, 分布, 动力学分析

Abstract: The distribution of TiN inclusions in 200 mm x 1 260 mm cast slab of ultra-pure ferrite stainless steel B439M (/%: 0.01C, 0.40Si, 0.25Mn, 0.020P, 0.001S, 17.50Cr, 0.15Ni, 0.20Ti, 0.0080N, 0.0040N) has been studied by automated scanning electro microscope Aspex. Results show that due to decrease in cooling rate from surface to inside of cast slab during solidifying process, lots of small size ( average 1. 26 μm) TiN inclusions form at edge of slab width, while at 1/4 of width and center of slab, from narrow side surface to 1/4 of thickness and from 1/4 of thickness to center of thickness the TiN nucleation rate decrease, the amounts of TiN inclusions decrease and size of TiN increases. It is obtained by kinetics analysis that the size of TiN inclusion increases with decreasing cooling rate coincides well with the distribution regulation of TiN inclusions in cast slab.