... Description steel pipe fittings1.variety: butt-welding, socket weld and thread fittings such as Elbows, Tees, Reducers, Caps, Stub Ends and Flanges ;2.material ... , metallurgy, foodstuff, machinery, pharmacy, construction, nuclear industry etc.4.standard:GB,SHJ,HGJ,HG,ANSI/ASME,JIS,DIN ... DNV, ABS, RINA, BV, GL, LR, NKK, KR etc. b. other certificate: ISO-9001 certificate, China manufacture License of ...