en-mbggal5mn(en-mb21220)年级：en-mmggal5mn数量：en-mb21220分类：镁合金锭标准：en1753:1997镁和镁合金。镁合金锭和铸件en-mgmgal5mn(en-mb21220)的化学成分%铁四锰镍铝铜锌别人-***大0.004***大0.05***小0.27***大0.0014.5-5。3***大0.008***大0。2总计0.01镁-剩余部分)