Duplex Steel ASTM A479 UNS S32205 / A182 F60 Fasteners

Duplex Steel UNS S32205 A182 F60 Fasteners, Material Overview & Form Factors

Duplex Steel UNS S32205 A182 F60 is a high-performance alloy used wherever standard fasteners cannot meet the corrosion or strength requirement. TorqBolt manufactures the full Duplex Steel UNS S32205 A182 F60 fastener range, bolts, nuts, screws, washers, studs, and custom forgings, under one ISO 9001:2015 quality system, with PED 2014/68/EU module-H qualification for pressure-equipment service.

Where Duplex Steel UNS S32205 A182 F60 Excels

Duplex Steel UNS S32205 A182 F60 is specified in oil & gas wellhead components, refinery heat exchangers, petrochemical reactors, power-generation turbines, marine offshore platforms, and pharmaceutical / food-grade processing. Its corrosion resistance and strength make it a common choice where carbon and 300 series stainless steels fall short.

Form Factors Available

Standards & Certification

Duplex Steel UNS S32205 A182 F60 fasteners are supplied with EN 10204 3.1 (mill cert) or 3.2 (third-party witnessed) material test reports as standard. Additional certification packages: NACE MR0175 / ISO 15156, NORSOK M-650, API 6A (wellhead), PED 2014/68/EU. Third-party inspection by TUV, Lloyd's, BV, DNV, SGS, and Intertek arrangeable on order.

: specification facts on this page checked against ASTM A182/A182M, ASTM A479/A479M, NACE MR0175 / ISO 15156, ASTM A193/A193M, ASTM A320/A320M, ASTM A453/A453M, ASTM A540/A540M, API 20E, API 20F, NORSOK M-630 Rev.5, ASTM A276/A276M.

Duplex & Super Duplex Stainless Steels

Duplex stainless steels have a mixed ferritic-austenitic microstructure. In ASTM A479 Table 2, annealed S31803 and S32205 have a minimum yield strength of 65 ksi [450 MPa], against 30 ksi [205 MPa] for Type 304 and 316.

Duplex 2205 (UNS S32205) is the common 22Cr duplex grade. Super Duplex 2507 (S32750) and Zeron 100 (S32760) are 25Cr grades: NORSOK M-630 requires PREN (Cr + 3.3 Mo + 16 N) of 40.0 min for type 25Cr duplex, and ASTM A182 Table 2 note O sets Cr + 3.3(Mo + 1/2 W) + 16 N at 41 min for S32760. SA-182 F51 / F53 / F55 / F60 are the matching ASTM A182 / ASME SA-182 forging grades (F51 = S31803, F53 = S32750, F55 = S32760, F60 = S32205).

Phase balance is critical: ISO 15156-3 Table A.24 requires 35-65% ferrite in the base metal and A.7.2 requires 30-70% in weld metal. ASTM A182 Table 1 sets solution treatment at 1020°C min for F51 and F60, 1025°C min for F53 and 1100-1140°C for F55, followed by liquid quenching. Bar is supplied to ASTM A479 with EN 10204 3.1 / 3.2 certs. Ferrite count and Charpy impact testing at -46°C are added when the order calls for them, for example NORSOK M-630 MDS D59 for 25Cr duplex studs, bolts and nuts.

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