Home / Standards / JB/T 5974.4-1992 JB/T 5974.4-1992 Active PN2.5MPa整体可锻铸铁管法兰 Standard Type JB ICS N/A CCS N/A Status Active Issue Date 1992-07-17 Implementation 1993-07-01 Centralized Committee 机械工业部 Issuing Authority 机械工业部