摘要
从第Ⅲ脆性区、振痕以及偏析3个方面分析探讨了连铸板坯表面横裂纹的形成机理,得出仅从第Ⅲ脆性区方面不足以解释裂纹的产生,还要考虑偏析以及引起应力集中的因素(如振痕、夹杂等)。在此基础上简要讨论总结了防止板坯横裂纹产生的措施:如铸坯矫直温度、晶界析出物、二冷区冷却速度和低C钢C%的控制;结晶器振幅、锥度和保护渣的改进,降低钢中S、P含量和提高Mn/S,降低结晶器弯月面的冷却速度和改善结晶器表面光洁度等。
The formation mechanism for transverse surface crack of continuous casting slabs is analyzed and delved from three aspects- No3 brittle zone,oscillation mark and segregation.It is obtained that the brittlement of steel at No3 brittle zone is not enough to explain the formation of transverse surface crack,the segregation and the factors leading to stress concentration such as oscillation marks and inclusions are also taken into account.On this studied basis the measures to prevent the transverse surface crack of slab are discussed and simply summarized including controlling casting slab straightening temperature,precipitates at grain boundary,cooling rate at secondary cooling zone and C%in low carbon steel;improving oscillation amplitude and taper of mold,and mold powder;decreasing S and P content in steel,increasing Mn/S, decreasing cooling speed at mold meniscus and improving mold surface roughness factor.
出处
《特殊钢》
北大核心
2011年第1期19-22,共4页
Special Steel
关键词
连铸板坯
表面横裂纹
第Ⅲ脆性区
振痕
偏析
Continuous Casting Slab
Transverse Surface Crack
No3 Brittle Zone
Oscillation Mark
Segregation
