Sealing surface form: raised surface (RF), concave-convex surface (MFM), tongue and groove surface (TG), ring connection surface (RJ)
Material: Carbon Steel: ASTM A105, 20#, Q235, 16Mn, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65 ,F70;
Alloy Steel (Alloy Steel): ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11, 16MnR, Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, St45.8/Ⅲ, 35CrMoV, 45CrMo, etc.
Manufacturing standards: ANSI B16.5, GB/T9117.1-2000-GB/T9117.4-200, etc.