[原注]:以下是摘自科隆年会上答辩报告的正式文本。问答尽可能保持原文,但有些经过缩短,改写。问:有人做过对活塞环进行盐浴氮化处理的尝试吗?如果做过,那么对活塞环的性能有什么改进呢?答:(Mueller)是的。有人用钢(在美国),也有人用铸铁做过一些这方面的尝试。试验表明性 [Original Note] The following is an excerpt from the official version of the defense report at the annual meeting in Cologne. Questions and answers keep the original text as much as possible, but some are shortened and rewritten. Q: Has anyone tried to nitriding a piston ring? If so, what is the improvement on piston ring performance? A: (Mueller) Yes. Some people use steel (in the United States) and others try it in cast iron. Test shows that sex