... 2)material:carbon steel,stainless steel,etc 3)standard:ANSI B16.5 4)WT:#150-#2500 5) ... ,etc size 1/2" to 24" ASME B16.5 24"to 80" ASME B16.47TypeWNF, SO, SWF, BL, ... , B, C, D, EstandardASME B16.5, ASME B16.47, ASME B16.36,DIN2505,EtcMaterialCarbon steel(ASTM A105,Q235,A350LF2 ... National Petroleum Corporation.We are also qualified the standard material supplier of China National Offshore Oil Corporation ...