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 Oil & Gas Downhole - NACE MR0175 Sour Service
Nitronic 60 oil and gas downhole (UNS S21800) hardware for subsea wellhead, christmas-tree, and downhole-tool service. NACE MR0175 / ISO 15156-3 sour-service compliant in the solution-annealed condition (95 HRB max hardness). API 6A wellhead applications including jumper flange bolting, christmas-tree fastener, and downhole-tool stud. Anti-galling chemistry eliminates the makeup-breakout galling that plagues 316L fasteners in subsea service.
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.
Service Envelope for Oil & Gas Downhole
Subsea wellhead service combines sour-gas exposure (H2S), elevated temperature (up to 175 C bottom-hole), chloride brine (sea water with dissolved salts), and remote operability (ROV-actuated). A galled bolt cannot be removed by ROV; the joint must be cut and replaced at considerable subsea-intervention cost. Nitronic 60 anti-galling chemistry eliminates this failure mode while meeting NACE MR0175 sour-service hardness limit in the annealed condition.
- NACE MR0175 / ISO 15156-3 compliant in solution-annealed condition (95 HRB max). Cold-worked HS requires customer endorsement.
- API 6A wellhead service, classes 2000 through 20000 psi pressure rating.
- H2S envelope, 0 to 1.45 psi partial-pressure compliant per MR0175 region 3 categorization.
- Subsea-intervention friendliness, dry installation, no anti-seize contamination of ROV tooling.
- Christmas-tree manifold service, sour-gas isolation valves, flow-control choke trim.
Target Components in Oil & Gas Downhole
- Subsea wellhead jumper flange bolting per API 6A.
- Christmas-tree stud bolts and hex nuts per ASTM A193 B8R / A194 8R.
- Downhole-tool drill-string fasteners.
- BOP (blowout preventer) ram fasteners.
- Subsea pipe-end-connector bolting.
- Sour-service valve trim per NACE MR0175.
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 hardware specified for oil & gas downhole, 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
Why Nitronic 60 for oil & gas downhole?
The anti-galling chemistry eliminates the dominant failure mode of 304 / 316L hardware in oil & gas downhole. Specifically the threshold galling stress per ASTM G98 is 5 to 10 times higher self-mated.
What forms are typically specified?
Fasteners (hex bolts, stud bolts, hex nuts), shafts, bushings, valve trim, sliding-contact components. See full fastener portfolio for the catalog overview.
What certification is required for oil & gas downhole?
Typically EN 10204 3.1 mill test certificate as standard, with 3.2 dual-witnessed inspection (Lloyds, TUV, DNV, BV) for safety-critical or regulatory-monitored components. NACE MR0175 compliance available where sour-service exposure is part of the envelope.
Alternative materials for oil & gas downhole?
Duplex 2205 (better chloride resistance, moderate galling), Inconel 625 (high-temperature corrosion at much higher cost), Stellite 6 (extreme galling at 15 to 25 times the cost). Nitronic 60 is the stainless-price-point anti-galling specification.
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