Home / Standards / GB/T 1177-1991 GB/T 1177-1991 Abolished Casting magnesium alloys 铸造镁合金 Standard Type GBT ICS 77.120.20 CCS J31 Status 废止 Issue Date 1991-01-05 Implementation 1991-12-01 Responsible Dept 国家标准委 Drafting Unit N/A