中厚钢板缺陷分析及原因探讨  

Study of Flaws in Heavy and Medium Plate

作　　者：孙齐松[1] 王新华[1] 许晓东[2] 江东才[2] 白学军[2] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]首秦金属材料有限公司技术质量部,河北秦皇岛066001

出　　处：《钢铁》2007年第8期41-45,共5页Iron and Steel

摘　　要：对不同厚度规格中厚钢板用超声波探伤观察到的缺陷统计和分析表明:中厚钢板内部缺陷为钢板厚度中心区域珠光体带中的微裂纹。位于偏析区内宽度超过25μm珠光体带中;裂纹源为珠光体带中MnS类型的塑性夹杂与钢基体的界面;裂纹的形成温度低于700℃,形成于轧后冷却或矫直阶段。铸坯中心线偏析是产生裂纹的内部条件,轧后冷却或矫直过程中的张应力是外部条件。Flaws in the heavy and medium plate of different thickness detected by ultrasonic detector were studied. Conclusions are： firstly, flaws are caused by micro-cracks in the pearlite band at the center area of the plate; secondly, micro-cracks mostly appear in the pearlite band wider than 25 μm located in the centerline segregation area; thirdly, the interface between MnS type plastic inclusions and the matrix is the source of cracks; fourthly, micro cracks form after the hot rolling and at the temperature lower than 700 ℃. The internal condition for cracking is the centerline segregation of slab and the external is the tensile stress of slab formed during cooling or straightening.

关 键 词：中厚钢板 超声波探伤 裂纹 

分 类 号：TG115.285[金属学及工艺—物理冶金]