... 4.API, TUV...certificate 5.Punctual shipment Tianjin Binhai Guanghao Pipe Fitting Co. LTDMaterialCarbon Steel, Alloy, SSStandardASTM , ANSI, DIN, GB, JB/TSpecificationL ... 's requestCertificateAPI, TUV, pressure piping components manufacturer license etcApplicationsoil, chemical industry, nuclear power station, construction ,paper industry, shipbuilding industry etc. casing pipe