Steel flange (WN SW SO BL) 1) OD:1/4'-48' 2) Type:WN SW SO BL RTJ 3) Standard :ANSI AMSE DIN 4) Pressure :class150-2500 1.standard : ASME,ASTM,ANSI,DIN,JIS,API,MSS,AWWA2.size : 1/2" ~ 80"3.material : CS,SS.Alloy4.type : WN,SO,BL,LWN etc.5.certificate : ISO6.Pressure : 150LB ~2500LB7.Face type : Raised, Flat, Ring joint, Lapped joint. etc all kinds available 8. Certification : ISO 9001, ISO14001 9 ...