关于蠕墨铸铁标准的几点看法

简要介绍了国内外有关蠕墨铸铁标准的情况。对蠕化率的评定，蠕墨铸铁牌号和蠕化率的规定提出了看法，并建议尽快制订我国的蠕默铸铁国家标准。标准要考虑今后蠕墨铸铁的主要发展方向和应用领域，汽车零件蠕化率应规定≥80%，但同时规定对其他零件允许蠕化率≥50%，或制造商与用户协商规定特殊的蠕化率要求。

Some Suggestions on Vermicular Graphite Cast Iron Standard

The presenl standards reevant to vermicular irons in China, Europe and United States were introduced briefly. Some opinions on vermicular graphite percent assessment method, grades classification of vermicular irons and the lowest limit of vermicular graplite percent were proposed.The principal developing direetion and applications of vermicular irons from now on should be considered as the basis for drawing the standard The lowest limit of vermicular graplite percent should be speciffcd as 80% and higher and it is should be specified also that the v.g percent of 50% and higher is permited for some parts. or the v.g.percent can be speciffed through negotiation of manufacturer with client .