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 ›› 2009, Vol. 30 ›› Issue (5): 45-46.

• 工艺技术 • 上一篇    下一篇

310S耐热不锈钢连铸板坯表面纵裂分析和工艺改进

李俊,李晓红,范新智,李国平   

  1. 太原钢铁(集团)有限公司技术中心,太原 030003
  • 收稿日期:2009-03-25 出版日期:2009-10-01 发布日期:2022-11-18
  • 作者简介:李俊(1978-),男,硕士,不锈钢品种研究和开发。

Analysis on Surface Longitudinal Crack of Concasting Slab of Heat Resistant Stainless Steel 310S and Process Improvement

Li Jun , Li Xiaohong , Fan Xinzhi , Li Guoping   

  1. Technical Center,Taiyuan lron and Steel(Group)Co Ltd,Taiyuan 030003
  • Received:2009-03-25 Published:2009-10-01 Online:2022-11-18

摘要: 310S奥氏体耐热不锈钢(%:0.05C、24.5Cr、19.3Ni)导热性差[100℃导热系数0.029×4.18J/(cm·℃)],200 mm×(950~2 150)mm连铸板坯易产生纵裂纹(宽0.1~10 mm,深1~20 mm)。通过采用熔点1 085℃的保护渣(ST-SP/310)替代熔点1 120℃的保护渣(ST-SP/810),结晶器宽面和窄面的冷却水流量分别从4 500 L/min和460 L/min降至4 300 L/min和430 L/min,钢水过热度从30~45℃降至20~35℃,拉速从0.95m/min降至0.80~0.90 m/min,铸坯质量明显改善,消除了表面纵裂。

关键词: 310S耐热不锈钢, 连铸板坯, 纵裂, 工艺改进

Abstract: As heat conductivity of austenite heat resistant stainless steel 310S (%:0.05C,24.5Cr,19.3Ni)is poor,only 0.029 × 4.18 J/(cm · ℃)at 100℃,the surface longitudinal cracks with wide 0.1~10 mm and depth 1~20 mm of 200 mm ×(950~2150)mm casting slab easy produce.By using mold flux ST-SP/310 with lower melting point-1085 ℃ to replace mold fux ST-SP/810 with higher melting point-1120℃,decreasing broad face and narrow face cooling; water rate respectively to 4300 L/min and 430 L/min from original 4500 L/min and 460 L/min,decreasings liquid superheating extent to 20~35℃ from 30~45℃ and lowering casting speed to 0.80~0.90 m/min from 0.95 m/min,the quality of cast slab obviously improves to avoid the occurrence of surface longitudinal crack.

Key words: Heat Resistant Stainless Steel 310S, Concasting Slab, Longitudinal Crack, Process Improvement