Flange manufacturer / supplier in China, offering High Pressure Carbon Steel Blind Flange ASTM A350 Lf2 Lf3 Lf6 ASME ANSI B16.36 for Boilers Storage Tanks and High-Pressure Pipeline Isolation, High Pressure Carbon Steel Blind Flange ASTM A350 Lf2 Lf3 Lf6 ASME ANSI B16.5 for Boilers Storage Tanks and High-Pressure Pipeline Isolation, High Pressure Carbon Steel Blind Flange ASTM A105 A105n Awwa C207 Table 2 to 7 Class B/D/E/F for Boilers Storage Tanks and High-Pressure Pipeline Isolation and so on.