20钢管外折缺陷原因分析及改进措施

特殊钢 ›› 2019, Vol. 40 ›› Issue (5): 43-45.

20钢管外折缺陷原因分析及改进措施

吕国成¹，齐晓峰²，包丽明¹

1吉林电子信息职业技术学院，吉林132021 ；
2通化钢铁集团股份有限公司，通化134003

收稿日期:2019-04-26 出版日期:2019-10-01 发布日期:2022-05-12
作者简介:吕国成(1982-)，男，硕士(2009年辽宁科技大学)，副教授， 2006年鞍山科技大学(本科)毕业，钢铁冶金研究

Forming Cause Analysis on Outer Fold Defects of 0.20%C Steel Pipe and Improvement Measures

Lil Guocheng¹, Qi Xiaofeng² ，Bao Liming¹

1 Jilin Technology College of Electronic Information, Jilin 132021;
2 Tonghua Iron and Steel Group Co Ltd, Tonghua 134003

Received:2019-04-26 Published:2019-10-01 Online:2022-05-12

摘要/Abstract

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1250℃提高到1270℃等措施,20钢穿管一次合格率由47.01%提高到96%以上。

Abstract: 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 superheates extent 15 ~30℃ , and increasing the temperature of Rotary hearth furnace from 1250 ℃ to 1270 ℃ etc improvement measures, the first qualified steel rate of the 0.20% C steel piercing pipe is increased from 47. 01% to above 96%.

吕国成, 齐晓峰, 包丽明. 20钢管外折缺陷原因分析及改进措施[J]. 特殊钢, 2019, 40(5): 43-45.