Flange manufacturer / supplier in China, offering High Pressure Alloy Steel Blind Flange ASTM A182 F1 F5 F9 F11 F22 ASME ANSI B16.47 Series B (API 605) for Boilers Storage Tanks and Pipeline Isolation, High Pressure Alloy Steel Blind Flange ASTM A182 F1 F5 F9 F11 F22 ASME ANSI B16.47 Series a (MSS SP44) for Boilers Storage Tanks and Pipeline Isolation, High Pressure Alloy Steel Blind Flange ASTM A182 F1 F5 F9 F11 F22 ASME ANSI B16.36 for Boilers Storage Tanks and Pipeline Isolation and so on.