Feature of Welding Neck Flange
Standard：
HG20592-97 ~20614-97 ,PN0.25MPa（2.5bar）--25MPa(250bar)
HG20615-97~20635-97 ,PN2.0MPa（class150）---42.0Mpa(class 2500)
Material of Flange
Carbon  steel ：ASTM A234，Q235A/B ，20#，JIS2311/2312
stainless steel：310，304，316，316L
Alloy steel ：Q345，16Mn，15CrMo,12Cr1MoV，N76，P91，P22。
Standard :JIS ,DIN ,GB ,ASTM/ANSI
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