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SiO_(2)和CaO均为28%~31%、Al_(2)O_(3)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。
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%SiO_(2),28%-31%CaO,6%-9%Al_(2)O_(3),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.
作者
冯为民
薛井恒
邢国成
任飞
王宏坡
王雨
Feng Weimin;Xue Jingheng;Xing Guocheng;Ren Fei;Wang Hongpo;Wang Yu(Jiangsu Citicsteel-Chianaref new materials institute Co.,Ltd.,Wuxi 214266;Fushun Special Steel Co.,Ltd.,Fushun 113001;College of Materials Science and Engineering,Chongqing University,Chongqing 400044)
出处
《特殊钢》
2023年第3期53-58,共6页
Special Steel
关键词
Cr13型马氏体不锈钢
连铸
纵裂
保护渣
Cr13 Martensitic Stainless Steel
Continuous Casting
Longitudinal Cracking
Mold Flux
