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 ›› 2023, Vol. 44 ›› Issue (3): 53-58.DOI: 10.20057/j.1003-8620.2022-00220

所属专题: 连铸工艺

• 冶炼与凝固 • 上一篇    下一篇

Cr13型马氏体不锈钢方坯连铸保护渣的开发

冯为民1, 薛井恒2, 邢国成2, 任飞2, 王宏坡3, 王雨3   

  1. 1 江苏中特嘉耐新材料研究院有限公司, 无锡 214266;
    2 抚顺特殊钢股份有限公司, 抚顺 113001;
    3 重庆大学材料科学与工程学院, 重庆 400030
  • 收稿日期:2023-01-18 出版日期:2023-06-01 发布日期:2023-05-17
  • 作者简介:冯为民(1966-),男,工程师

Development of Mold Flux for Continuous Casting of Cr13 Type Martensitic Stainless Steel Square Billet

Feng Weimin1, Xue Jingheng2, Xing Guocheng2, Ren Fei2, Wang Hongpo3, Wang Yu3   

  1. 1 Jiangsu Citicsteel- Chianaref new materials institute Co., Ltd., Wuxi 214266;
    2 Fushun Special Steel Co., Ltd., Fushun 113001;
    3 College of Materials Science and Engineering, Chongqing University, Chongqing 400044
  • Received:2023-01-18 Published:2023-06-01 Online:2023-05-17

摘要: 针对特钢厂4机4流连铸机生产的2Cr13、3Cr13、4Cr13铸坯表面凹陷、纵裂缺陷进行分析和研究,通过工艺措施解决了Cr13型马氏体不锈钢铸坯的表面凹陷和纵裂问题。采用预熔型保护渣,其中SiO2和CaO均为28%~31%、Al2O3为6%~9%、Na2O为7%~10%、F-为3%~6%,以及综合配碳,尤其是增加炭黑的加入量,总C含量为15%~18%。保护渣碱度控制在1.0左右,熔化温度为1130~1150 ℃,1300 ℃时黏度为0.40~0.55 Pa·s;保护渣转折温度为1140~1180 ℃,结晶率约为48.8% 。控制中间包内2Cr13钢液过热度≤30 ℃,3Cr13和4Cr13钢液过热度≤35 ℃;连铸过程中采用自动加渣方式,控制适宜的渣层厚度并保持液面稳定。

关键词: Cr13型马氏体不锈钢, 连铸, 纵裂, 保护渣

Abstract: The surface depressions and longitudinal cracks of 2Cr13, 3Cr13, and 4Cr13 casting billets produced through 4-machine and 4-strand continuous casting machines in a special steel plant were analyzed and studied, the surface depression and longitudinal cracks of Cr13 stainless steel billet were solved by processing measures. Pre-melting mold flux consisting of 28%-31% SiO2 , 28%-31% CaO , 6%-9% Al2O3 , 7%-10% Na2O and 3%-6% F- were used, and comprehensive carbon preparation, especially the addition of carbon black was increased; the total carbon content was 15%-18%. The basicity of mold flux was controlled at about 1.0, the melting temperature was 1130-1150 ℃, and the viscosity at 1300 ℃ was 0.40-0.55 Pa·s. The turning temperature of the mold flux was 1140-1180 ℃, and the crystallization rate was about 48.8%. The superheat of 2Cr13 liquid steel in the tundish should be less than 30 ℃, and the superheat of 3Cr13 and 4Cr13 liquid steel should be less than 35 ℃. Automatic slagging is adopted in continuous casting process to control appropriate slag layer thickness and keep liquid level stable.

Key words: Cr13 Martensitic Stainless Steel, Continuous Casting, Longitudinal Cracking, Mold Flux