摘要
采用酸洗、形貌观察和金相分析等方法对20钢管外折缺陷原因进行了研究。结果表明,连铸坯皮下气泡和针孔缺陷导致了圆钢表面纵裂纹,圆钢表面纵裂纹是导致钢管外折缺陷的直接原因。通过将钢中酸溶铝含量由0.006%~0.010%提高到0.010%~0.020%,连铸拉速稳定在(1.8±0.03)m/min,过热度控制在15~30℃和环形加热炉温度由1 250℃提高到1 270℃等措施,20钢穿管一次合格率由47.01%提高到96%以上。
The causes of outer fold defects of 0.20%C steel pipe are studied by means of pickling,morphology observation and metallographic examination.The results show that the subsurface blowholes and pinholes defects of the continuous casting billet lead to the longitudinal cracks on the surface of the round steel,which are the direct causes of the outer fold defects of the steel pipe.By increasing the acid-soluble aluminum content from 0.006%~0.010%to 0.010%~0.020%,controlling casting speed(1.8±0.03)m/min and superheatas extent 15~30℃,and increaing the temperature of Rotary hearth furnace from 1 250℃to 1 270℃etc improvement measures,the first qualified steel rate of the 0.20%C steel piercing pipe is increased from 47.01%to ahove 96%.
作者
吕国成
齐晓峰
包丽明
Lu Guocheng;Qi Xiaofeng;Bao Liming(Jilin Technology College of Electronic Information,Jilin 132021;Tonghua Iron and Steel Group Co Ltd,Tonghua 134003)
出处
《特殊钢》
北大核心
2019年第5期43-45,共3页
Special Steel
关键词
20钢
纵裂纹
外折缺陷
皮下气泡
0.20%C Steel
Longitudinal Crack
Outer Fold Defect
Subsurface Blowholes
