重钢七厂20管钢生产工艺的改进

Improvement of Production Process of 20 Pipe Steel in No.7 of Chongqing Iron & Steel Group co.

针对重钢七厂冶炼２０管钢连铸坯存在表面裂纹、夹杂、气泡、缩孔、内裂等质量缺陷的问题，对各生产工序进行了全面优化和调整，消除、减少了上述缺陷，铸坯合格率大幅度提高，证明所采用的措施是有效的。

In view of some defects such as surface cracks,inclusions,pinhole,cavities and internal crack existing on continuous cast billet for 20 pipe steel in No.7 plant of Chongqing Iron & Steel Group co.,individual production processes have been comprehensively optimized and adjusted so as to eliminate or reduce such defects.The measurements adepted have been proved to be effective by largely increase in acceptance rate of billet.