Home / Standards / JB/T 7946.1-1999 JB/T 7946.1-1999 Abolished 铸造铝合金金相 铸造铝硅合金变质 Standard Type JB ICS N/A CCS N/A Status Abolished Issue Date 1999-06-24 Implementation 2000-01-01 Centralized Committee 国家机械工业局 Issuing Authority 国家机械工业局