Home / Standards / JB/T 6438-1992 JB/T 6438-1992 Abolished 阀门密封面等离子孤堆焊技术要求 Standard Type JB ICS N/A CCS N/A Status Abolished Issue Date 1992-07-20 Implementation 1993-01-01 Centralized Committee 机械工业部 Issuing Authority 机械工业部