耐磨钢板NM400切割延迟裂纹分析  

Analysis on Formation of Delayed Cracks of Abrasion-resistant Steel Plate NM400 after Cutting

作　　者：张涛[1] 侯华兴[1] 杨军[2] 隋晓红[1] 刘明[1] 

机构地区：[1]鞍钢股份有限公司技术中心,辽宁鞍山114001 [2]鞍钢股份鲅鱼圈钢铁分公司,辽宁鞍山114021

出　　处：《钢铁钒钛》2013年第5期89-94,共6页Iron Steel Vanadium Titanium

摘　　要：从低倍组织、显微组织等方面对80 mm厚度NM400产生切割延迟裂纹的原因及解决方法进行了分析。结果表明,钢板厚度中心组织粗大且存在明显的中心缩孔、偏析等缺陷;热处理及火焰切割过程形成的各种残余应力综合作用于钢板中心缺陷部位是该钢板切割延迟裂纹产生的主要原因;通过降低连铸坯缺陷,改善热处理及切割工艺可有效避免切割延迟裂纹的产生。The causes of delayed cracks forming in 80 mm-thick abrasion-resistant steel plates NM400 after cutting were investigated by analyzing macrostructures and microstructures of the plates,and countermeasures to avoid such kind of cracks were considered. The result shows that there are several center contraction cavities and segregations in the mid-depth of the plate,and microstructures there are coarse; the impact of various residual stresses generating during heat treatment and the flame cutting process on this area is the main reason for the formation of the delayed crack. The delayed cracks can be effectively avoided by reducing defects in continuously cast blooms and improving heat treatment and cutting process.

关 键 词：耐磨钢 延迟裂纹 组织 

分 类 号：TG48[金属学及工艺—焊接]