汽车活塞销用钢质量检验与改善试验

采用一种定性的塔形检测方法对活塞销用20CrH圆钢进行了检验分析，并与其他钢厂进行了对比。研究发现，该圆钢中心部分存在簇状黑线为中心的偏析线且较严重，不能满足用户要求。为改善中心偏析，对轧制加热工艺进行优化，效果不明显，需要进一步优化炼钢工艺，缓解铸坯中心偏析。通过这种定性的塔形检测方法，能够较为全面地反映活塞销的外工作面、内部质量和内孔质量，为活塞销用钢检验以及标准的制定提供了指导和参考。

Quality inspection and improving experiment of auto piston pin steel

A qualitative tower detection method was used to test 20CrH round steel for piston pin, whose results were compared to that in other steel mills. The study found that the clustered black line was center segregation line and was more serious, which can not meet the requirement of the user. In order to improve center segregation, the system of the heating process of rolling was optimized, while, the effect was not obvious. Therefore, the steelmaking process needed to further optimize to remit the center segregation. The qualitative detection method can fully reflect the internal quality, the surface quality and inner hole quality of piston pin. It can provide guidance and reference for piston pin steel inspection and standard setting.