管坯用圆钢12Cr1MoVG表面长裂纹原因分析及改进措施  

Reason Analysis and Improvement Measures on the Surface Long Crack of 12Cr1MoVG Hot Rolled Blank Bar

作　　者：郭发军 李祥才 崔建海 张智涛 GUO Fajun;LI Xiangcai;CUI Jianhai;ZHANG Zhitao(The Bar Research Institute of Qingdao Special Iron and Steel Co.,Ltd.,Qingdao 266409,China)

机构地区：[1]青岛特殊钢铁有限公司棒材研究所,山东青岛266400

出　　处：《山东冶金》2024年第3期23-24,27,共3页Shandong Metallurgy

摘　　要：按照GB/T 31212—2014标准对12Cr1MoVG管坯用圆钢进行了表面漏磁探伤,结果表明,深度>0.30 mm的长裂纹比例占15%左右,分析发现造成管坯用圆钢表面长裂纹的主要原因是铸坯角部裂纹。通过采取将中包钢水过热度由15~30℃提高到35~45℃,铸坯拉速由0.85 m/min提高到0.95 m/min,铸坯采取弱冷和均匀冷却等措施来解决了该问题。12Cr1MoVG管坯用圆钢长裂纹比例降到了3%以下。MFLT was done for the 12Cr1MoVG blank bar in accordance to standard GB/T 31212-2014,the detection results showed that the proportion of the long crack with the depth more than 0.30 mm was 15%around.The analysis showed that the corner crack of the billet was the main reason which caused the long crack of the blank bar surface.The problem was settled through increasing tundish molten steel overheat temperature from 15-30℃to 35-45℃and increasing casting speed from 0.85 m/min to 0.95 m/min and adopting weak cooling and uniform cooling of billet etc.The long crack proportion was reduced to below 3%after adopting the technology improvements.

关 键 词：12Cr1MoVG钢 铸坯 角部裂纹 中包钢水过热度 铸坯拉速 

分 类 号：TF777[冶金工程—钢铁冶金]