Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
Nitronic 60 Flanges (UNS S21800) - Anti-Galling Stainless Flanges
Nitronic 60 flanges (UNS S21800) cover weld-neck, slip-on, blind, socket-weld, and lap-joint flange geometries per ASME B16.5 / B16.47 / API 6A. Used where flange-bolting galling at make-up or sealing-face galling under pressure cycling is the controlling failure mode.
TorqBolt stocks Nitronic 60 (UNS S21800) at our Mumbai head office and Rajkot production plant. Each consignment ships with EN 10204 3.1 mill test certification by default and 3.2 dual-witnessed inspection (Lloyds, TUV, DNV, BV) on request. Contact info@torqbolt.com or +91-22-66157017 for sized stock and lead time.
Nitronic 60 Flanges Specifications
Weld-neck, slip-on, socket-weld, lap-joint, blind, and threaded flange patterns across the full pressure-class range.
- Size range: 1/2 inch through 60 inch NPS; pressure classes 150 through 2500 (ASME) or 2000 through 20000 psi (API 6A).
- Standards: ASME B16.5 (1/2 to 24 in NPS) / ASME B16.47 (26 to 60 in NPS) / API 6A (wellhead).
- Weld-neck flanges: full-strength-weld joint, ideal for high-pressure / high-cycle / sour service.
- Slip-on flanges: easier alignment, two-fillet-weld attachment, lower pressure-class service.
- Socket-weld flanges: small-bore use, fillet-weld externally.
- Lap-joint flanges: bolt-hole rotation freedom for alignment, separate stub-end required.
- Blind flanges: solid disc for pipe-end or vessel-opening closure.
- API 6A wellhead flanges: classes 2000 / 3000 / 5000 / 10000 / 15000 / 20000 psi, NACE MR0175 sour-service compliant in annealed temper. See API 6A.
Chemistry — UNS S21800
Cr 16-18 / Mn 7-9 / Ni 8-9 / Si 3.5-4.5 / N 0.08-0.18 / C ≤0.10. See full element ranges with single and aggregate limits →
Mechanical Properties
Yield 55 ksi (380 MPa) min, tensile 95 ksi (655 MPa) min, elongation 35% min (annealed). Hardness Rockwell B95-95 typical. See full mechanical specification with bar / forging / wire conditions →
Galling Resistance
Nitronic 60 threshold stress 50,000 psi+ per ASTM G98 vs 304/316L at 4,000-6,000 psi — 5 to 10× better galling resistance. See full ASTM G98 data and galling failure mechanism →
Heat Treatment
Solution anneal only at 1900-1950°F followed by water quench. No precipitation hardening response. See full heat treatment specification →
Welding
Matching filler ER218 per AMS 5847. GTAW, GMAW, and SMAW all qualified. No PWHT required for typical thicknesses. See full welding procedure →
Material Selection
Nitronic 60 wins for anti-galling at high temperature where 304/316L gall. Stellite is harder but brittle. vs 316L · vs Nitronic 50 · austenitic context →
Nitronic 60 Applications by Industry
- Marine and offshore, anti-galling bolting and deck hardware.
- Oil and gas, subsea wellhead, NACE MR0175 sour service, christmas-tree fasteners.
- Nuclear, valve trim, pump shafts, reactor coolant bolting.
- Food processing, FDA-acceptable austenitic, sanitary fittings, mixer paddles.
- Cryogenic, LNG hardware, austenitic stability to -196 C.
- Pump and rotating equipment, shafts and bushings under sliding seal contact.
- Valve stems, gate / globe valve stems under pressure cycling.
- Anti-galling general applications, cross-industry summary.
Related Nitronic 60 Forms and Fasteners
- Bar: round bar, hex bar, square bar, flat bar.
- Plate, sheet, forgings: plate, sheet, forgings.
- Wire and tubing: wire, spring wire, tubing, seamless pipe.
- Bolts: hex bolts, stud bolts, anchor bolts, socket head cap screws.
- Nuts: hex nuts, heavy hex nuts, lock nuts, jam nuts.
- Pins and inserts: dowel pins, clevis pins, bushings, Helicoil thread inserts.
- Catalog: full Nitronic 60 fastener portfolio, anti-galling fasteners.
Request a Quote
For Nitronic 60 flanges in any size, Contact the TorqBolt QA-QC team at info@torqbolt.com or +91-22-66157017. We respond within 24 hours with sized stock availability, lead time, and EN 10204 3.1 / 3.2 MTC documentation samples.
Frequently Asked Questions
What sizes of flanges are stocked?
1/2 inch through 60 inch NPS; pressure classes 150 through 2500 (ASME) or 2000 through 20000 psi (API 6A). Custom larger sizes and special tolerances quoted on a 4 to 8 week lead time.
What standards govern flanges?
ASME B16.5 (1/2 to 24 in NPS) / ASME B16.47 (26 to 60 in NPS) / API 6A (wellhead). Customer specifications may add explicit dimensional, surface, or test requirements.
Can flanges be supplied in cold-worked HS condition?
Yes. Solution-annealed (S-A) is standard. Cold-worked HS condition reaches 620 MPa yield and 30 HRC maximum hardness; specify on order.
What surface finishes are available?
Mill / pickled-passivated standard per ASTM A380. Polished, 2B mill, and 2D mill finishes available on request. Sanitary-finish (Ra 0.4 to 0.8 um) for food-processing service.
What certification ships with flanges?
EN 10204 3.1 mill test certification by default. EN 10204 3.2 dual-witnessed third-party (Lloyds, TUV, DNV, BV) on request.
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