首秦公司特厚板坯表面横裂纹的形成机制  

Formation Mechanism of the Transverse Cracks in Ultra-Thick Slabs for Shouqin

作　　者：甄新刚[1] 朱志远[1] 杨建平[1] 王玉龙[1] 刘洋[2] 赵新宇[2] 

机构地区：[1]秦皇岛首秦金属材料有限公司炼钢部,河北秦皇岛066000 [2]首钢技术研究院,北京100043

出　　处：《钢铁》2013年第6期29-33,共5页Iron and Steel

摘　　要：分析了板坯厚度、钢液碳含量、铌含量、拉速、动态配水模型和3D喷淋技术对400mm特厚板坯表面横裂纹的影响。研究表明,由于动态二次冷却模型存在缺陷,使得特厚板坯在低拉速浇铸时,受二冷区最小水量的限制,在矫直力和热应力的综合作用下,坯壳承受的总应变超过了其临界应变值,在距离铸坯角部150～500mm的振痕波谷处,最终形成沿晶界开裂的表面横裂纹。Factors influencing transverse cracks such as the thickness of slabs,the carbon and niobium content in liquid steel,the casting speed,the dynamics model and the technology of 3D sprays,were investigated.The results show that,because of the defects in the dynamic secondary cooling model,for the ultra-thick slabs with low casting speed,by the minimum water restrictions of the secondary cooling zone,and under the comprehensive action of the straightening force and the thermal stress,if the total strain of shell is more than its critical strain,the transverse cracks finally forms along the grain boundary,located at the vibrating mark trough distance slab corner 150-500 mm.

关 键 词：特厚板坯 表面横裂纹 矫直应变 动态配水模型 3D喷淋技术 

分 类 号：TG245[金属学及工艺—铸造]