单体铸造活塞环金相检验国家标准已于1980年12月上旬在江苏省无锡市审定通过,待上报国家标准局审批后,即可公布实行。 十多年来,活塞环的金相标准一直是行业中争议的问题。从1966年的“试行草案”到1980年的金相标准,前后约十五年时间。中间经过两次较大的修改。现就三方面的问题谈谈自己的粗浅认识。 Monolithic casting piston ring metallographic examination of national standards in early December 1980 in Wuxi City, Jiangsu Province, approved, to be submitted to the National Bureau for approval, you can publish the implementation. For more than a decade, the metallurgical standards for piston rings have been the subject of controversy in the industry. From 1966 “draft” to the metallographic standards in 1980, about fifteen years before and after. In the middle after two major changes. Now I talk about my superficial understanding of the three issues.