... API, TUV...certificate 5.Wherever needed CARBON STEEL FITTINGS/BUTT--WELDING FITTINGSMaterialSteel, Alloy, SSStandardASTM ANSI B16 ... ,shipbuilding industry etc.We are manufactuer of pipe fittings with self-management export power.Our products ... , pipe bend, pipe reducer, pipe tee, pipe cross, pipe nipple, pipe cap, pipe union and threaded pipe socket series and component products. steel pipe fittings