en-mbggal4si(en-mb21320)年级：en-mmggal4si数量：en-mb21320分类：镁合金锭标准：en1753:1997镁和镁合金。镁合金锭和铸件en-mgmboal4si级化学成分%(en-mb21320)铁四锰镍铝铜锌别人-***大0.0040.7-1。2***小0。2***大0.0013.7-4。8***大0.008***大0。2总计0.01镁-剩余部分)