... "to 72" 2)material:carbon steel,stainless steel,etc 3)standard:ANSI B16.5 4)WT:#150-#2500 5)API,ISO ... ,Etc /PN6,PN10,PN16,PN20,PN25,PN40/ Class A, B, C, D, EstandardASME B16.5, ASME B16.47, ASME B16.36 ... and China National Petroleum Corporation.We are also qualified the standard material supplier of China National Offshore Oil Corporation and China ...