热轧带钢Q345B表面唇状疤块缺陷的形成原因及控制
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摘要
在热轧产品Q345B中出现批量的横向唇状疤块缺陷裂纹,利用金相显微镜观察带钢的微观组织,分析现场生产的实际情况与试验数据,对热轧产品Q345B表面唇状疤块缺陷的形成原因进行了分析,发现唇状疤块缺陷裂纹处附近的组织晶粒存在较大差异,且缺陷的产生与轧制过程的冷却不均有关。
In the hot rolled product Q345 B,transverse lip-like scar cracks appeared in batch.The microstructure of the strip was observed by metallographic microscope,and the actual situation of the on-the-spot production and test data were analyzed.The formation of lip scar defects on the surface of hot rolled Q345 B was analyzed.It was found that there were great differences in the microstructure grains near the defects in the hot rolled Q345 B,and the defects were related to the inhomogeneity of cooling during rolling.
In the hot rolled product Q345 B,transverse lip-like scar cracks appeared in batch.The microstructure of the strip was observed by metallographic microscope,and the actual situation of the on-the-spot production and test data were analyzed.The formation of lip scar defects on the surface of hot rolled Q345 B was analyzed.It was found that there were great differences in the microstructure grains near the defects in the hot rolled Q345 B,and the defects were related to the inhomogeneity of cooling during rolling.
引文
[1]邸洪双,王晓南,宁忠良.热轧板带边部缺陷形成机理及研究现状[J].河南冶金,2008,16(3):1-2.
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[3]GB/T 14977-2008,热轧钢板表面质量的一般要求[S].
[4]GB/T912-1989,碳素结构钢和低合金结构钢热轧薄钢板和钢带尺寸、外形及允许偏差[S].
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[2]王永胜,成泽伟,李宏,等.热轧板坯表面缺陷分析[J].钢铁研究学报,2002,14(2):75-76.
[3]GB/T 14977-2008,热轧钢板表面质量的一般要求[S].
[4]GB/T912-1989,碳素结构钢和低合金结构钢热轧薄钢板和钢带尺寸、外形及允许偏差[S].
[5]刘波.热轧带钢边裂缺陷的成因研究[J].四川冶金,2006,28(2):16-17.
[6]龚佳仙.钢铁产品缺陷与失效实例分析图谱[M].北京:冶金工业出版社,2012:22-24.