GB/T 9121-2010
AbolishedLoose plate steel pipe flanges with weld-on collar
平焊环板式松套钢制管法兰
📚 References & Relations / 引用与关联
replaces
GB2508-89
replaces
GB9121-2000
📊 Standard Timeline / 标准沿革
replaces
GB2508-89
replaces
GB9121-2000