ASTM A182 F51 blind flange is a duplex stainless steel flange that highly suitable for applications dealing with environments containing chlorides and hydrogen sulphide. It has to withstand remarkable mechanical stress due to the system pressure and the required bolting forces.
F51 Blind Flange differs from other flange in that it does not have a center hole and is used to block the flow of the fluid. Moreover,it is sold at a premium average cost per kilogram due to it is easier to manufacture.
The common specification standards of forged A182 F51 Blind Flanges are ASME B16.5 and ASME B16.47. ASME B16.47 Blind Flange has larger diameter than ASME B16.5 Blind Flange.
ASME B16.47 flange is form NPS 26 through NPS 60 in ratings classes 75, 150, 300, 400, 600, and 900. And further divided into series A and series B for blind flange and weld-neck flange. Series A can withstand more external loading than Series B type, and series b needs more but smaller fasteners (bolts & nuts) than series a flanges.
They are common used in Aerospace, Nuclear Engineering, Chemical Industry, and Heat Treating Industry.
ASTM A182 F51 is a Duplex Stainless Steel (DSS) with 50% ferrite and 50% austenite,so it is also called Ferritic-Austenitic Stainless Steel.
It has many alias, the most common one is UNS S31803, and other alias are
- X2CrNiMoN 22-5-3
- Z3CND22-05 Az
- SUS 329J3L
This duplex steel is more common in pressure systems,forged flanges,valves fittings,couplings,rings,shafts, and other forgings.
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