摘要
针对Q420NHB耐候H型钢在腹板和翼缘表面产生微裂纹,影响产品质量。通过金相显微镜和扫描电镜观察,分析了裂纹产生的原因。结果表明,翼缘表面缺陷是由于铸坯内弧皮下裂纹及间裂造成的,而腹板表面缺陷是由于在轧制过程中铸坯表面的氧化铁皮压入导致。通过对连铸过程中结晶器冷却工艺以及轧制工艺的优化,有效改善了耐候H型钢表面质量。
The causes of cracks are analyzed through the observation with metalloscope and scanning electron microscopy aiming at the problem that product quality is affected by the microcracks on surfaces of web and flange of Q420NHB weathering resistant H-shaped steel.The results showed that the surface defects of flange were caused by the subcracks and intercrystalline cracks on inner arc of ingot blank,while the surface defects of web were caused by the pressfit of scale on surface of ingot blank during rolling process.The surface quality of weathering resistant H-shaped steel is effectively improved through optimizing the cooling process of crystallizer and rolling technology during continuous casting process.
作者
刘丽娟
卜向东
宋振东
王刚
赵晓敏
杨鲁明
惠治国
Liu Li-juan;Bu Xiang-dong;Song Zhen-dong;Wang Gang;Zhao Xiao-min;Yang Lu-ming;Hui Zhi-guo(Technical Center of Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China)
出处
《包钢科技》
2022年第6期41-44,共4页
Science & Technology of Baotou Steel
关键词
厚规格H型钢
表面缺陷
耐候钢
H-shaped steel with heavy gauge
surface defect
weathering resistant steel