Alloy AF932N® (UNS S31010) is the latest evolution of high nitrogen austenitic stainless steels.
It contains nitrogen in the range 0.8-0.9 % and has minimum 48 Pitting Resistance Equivalent Number (PREN).
This alloy is produced by air melting followed by AOD (Argon-Oxygen-Decarburization) refining in a vessel of 70 tons capacity, thus providing ingots up to 25 tons from which components up to 800 mm (31.5 in.) thickness can be manufactured.
AF932N® has excellent combination of mechanical properties and corrosion resistance even on large sections, thus providing a very attractive solution for widespread applications and offering a valid alternative to annealed and solution annealed Ni alloys as well as duplex and super duplex materials.
AF932N® is a highly alloyed austenitic stainless steel type 3b as defined by NACE MR0175/ISO 15156-3 (PREN > 40). Accordingly, it can be used for any equipment or components within the environmental limits of Table A.8, for gas lift service as per table A.10 and for instrument tubing, control-line tubing, compression fittings and surface and downhole screen devices as per Table A.11 of NACE MR0175/ISO 15156-3.
AF932N® is being balloted for inclusion in ASTM A276 – Standard Specification for Stainless Steel Bars and Shapes and ASTM A479 – Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels.