TorqBolt manufactures and supplies Incoloy 925 (UNS N09925) seamless and welded pipe to ASTM B983 (precipitation-hardened plate / sheet / strip used for seam-welded pipe), ASTM B829 (general requirements for nickel-alloy pipe), ASTM B704 (welded pipe) and customer-nominated specifications. All pipe is supplied in the solution-annealed and aged condition (per heat-treatment specification) with 100% hardness inspection ensuring the 35 HRC NACE MR0175 sour-service cap is never exceeded. Used for sour-service production tubing, completion strings, surface flow lines, sour-gas gathering systems, subsea tie-back jumpers, marine service water systems and chemical-processing pressure piping. Every order ships with EN 10204 3.1 manufacturer's MTC documenting actual heat-lot chemistry, mechanical results and heat-treatment cycle; 3.2 third-party witnessed (DNV / Bureau Veritas / Lloyd's / TUV / SGS) on request.
Need Incoloy 925 pipe? Email info@torqbolt.com with NPS / OD, schedule, length, quantity and applicable MTC level. WhatsApp +91-22-66157017.
Pipe Sizes & Schedules
| Form | Size Range | Schedules / Wall | Standard |
|---|---|---|---|
| Seamless pipe | 1/2" to 8" NPS | SCH 10S to SCH XXS | ASTM B829 / B167-equivalent |
| Welded pipe | 1/2" to 24" NPS | SCH 10S to SCH 160 | ASTM B704 (filler INCO-WELD 725NDUR) |
| Large diameter welded | 24" to 48" OD | 10 mm to 50 mm wall | Customer + ASTM B983 strip |
| Coiled tubing (small dia) | 1/4" to 2" OD | 0.065" to 0.250" wall | Customer + ASTM B983 strip |
End Preparation & Lengths
- Plain end (PE): Square-cut perpendicular to pipe axis, standard for further fabrication
- Bevelled end (BE): 30° bevel + 1.5 mm root face ASME B16.25, standard for butt-weld joints
- Threaded NPT: Per ASME B1.20.1, standard for instrument and tubing connections
- API rotary-shouldered: NC-26 to NC-50 per API Spec 7-1, for drill string and downhole connections
- Premium connections: VAM, Tenaris, Hydril, Atlas Bradford under license, for production / completion tubing
- Random lengths: 17–22 ft (5.2–6.7 m), standard mill output
- Double random: 35–44 ft (10.7–13.4 m), for pipeline / structural service
- Cut to length: ±3 mm tolerance on cut, ±0.1% on length, per customer requirement
Mechanical Properties (Aged Condition ASTM B805 / B983)
| Property | Aged Minimum |
|---|---|
| Tensile Strength | 165 ksi (1140 MPa) |
| 0.2% Yield Strength | 110 ksi (760 MPa) |
| Elongation in 4D | 18% |
| Reduction of Area | 25% |
| Hardness max (sour service) | 35 HRC (NACE MR0175 cap) |
| Charpy at -46°C (NACE) | 40 J min |
See full mechanical properties page for elevated-temperature data and Charpy envelope across the qualification temperature range.
Sour-Service Pipe Applications
- Production tubing in sour gas wells with H₂S partial pressure to 1000 psi (per NACE MR0175 Table A.10)
- Completion strings, production string + injection string for HPHT wells
- Surface flow lines from wellhead to first separator in sour fields
- Sour-gas gathering systems, manifolds, headers, branch lines
- Subsea tie-back jumpers, flow line to manifold connection in deepwater
- Marine service water systems, firewater, ballast in chloride-rich seawater (see marine applications)
- Chemical processing, reducing-acid + chloride mixed environments where lower-CRA alloys fail
Why Incoloy 925 Pipe vs Alternatives
- vs Carbon Steel API 5L: Carbon steel fails by SSC within hours in significant H₂S; Incoloy 925 is qualified to 1000 psi H₂S indefinitely.
- vs Duplex 2205: 2205 disqualified above 1.5 psi H₂S at 65°C per NACE Table A.21; Incoloy 925 has unrestricted sour envelope.
- vs Incoloy 825: 825 has lower strength (~45 ksi YS) and is restricted to 15 psi H₂S; 925 is 110 ksi YS qualified to 1000 psi.
- vs Inconel 625: 625 has unrestricted H₂S envelope but lower strength (~60 ksi YS); 925 wins where strength matters.
- vs Inconel 718: 718 restricted to 15 psi H₂S; 925 is the qualified choice for sour gas.
Documentation Package
- EN 10204 3.1 manufacturer's MTC (3.2 with TPI witness on request)
- Heat-lot chemistry vs UNS N09925 limits
- Tensile, hardness, Charpy results per heat / per heat-treatment lot
- Heat-treatment furnace chart-recorder traces
- NACE MR0175 Table A.10 reference (sour-service orders)
- NDE results: 100% UT / RT / hydrotest per applicable standard
- Pipe marking with heat number, OD × wall, length, MTC reference
Frequently Asked Questions
Seamless or welded, which is preferred for sour service? Both are NACE MR0175 qualified. Seamless is preferred for HPHT critical-service applications (eliminates the weld failure mode entirely). Welded is preferred for larger diameters (above ~8" NPS, where seamless production becomes impractical) and for cost-sensitive applications. TorqBolt's welded pipe uses INCO-WELD 725NDUR matching-strength filler with full PWHT (anneal + age) to recover joint properties to the parent-metal envelope.
What pressure rating do Incoloy 925 pipes achieve? Per ASME B31.3 with the aged-condition stress allowables, a 4" NPS SCH 80 pipe in Incoloy 925 is rated to ~6,000 psi at 200°F. Specific pressure ratings depend on temperature, service factor and code (ASME B31.3, B31.4, B31.8, etc.), we provide stress calculations on request.
What's the typical lead time for Incoloy 925 pipe? Welded pipe (standard sizes): 10–14 weeks. Welded pipe (large diameter or custom): 12–16 weeks. Seamless pipe: 14–18 weeks, longer lead-time reflects limited mill capacity for nickel-alloy seamless production. Cold-pilger reduction can shorten the seamless lead time for small-diameter tubing.
Can Incoloy 925 pipe be supplied to API 5CRA? Yes, API 5CRA covers corrosion-resistant alloy line pipe for the petroleum industry; UNS N09925 is one of the qualified materials. API 5CRA documentation is provided on request alongside the standard ASTM B829 / B704 MTC.
Related Products
- Incoloy 925 tube (seamless / welded / cold drawn), smaller OD, control-line and instrument applications
- Incoloy 925 plate, ASTM B983 sheet / plate / strip
- Incoloy 925 bar, ASTM B805 stock for machining
- Incoloy 925 forgings, flanges, fittings, custom forgings
- Incoloy 925 stud bolts, companion bolting for flanged pipe joints
Request a Quote
For Incoloy 925 pipe with full MTC documentation:
- Email: info@torqbolt.com
- Phone: +91-22-66157017
- WhatsApp: +91-22-66157017
Specify NPS / OD, schedule / wall thickness, length (random / cut to length), quantity, applicable standards (ASTM B829 / B704 / B983, API 6A / API 5CRA, NACE MR0175), end preparation (PE / BE / NPT / API rotary-shouldered / premium), required MTC level (3.1 or 3.2 with TPI witness), and any special inspection requirements (hydrotest pressure, eddy-current testing, hardness mapping).
References: ASTM B983; ASTM B829 (general requirements for wrought nickel-alloy pipe); ASTM B704 (welded UNS N09925 pipe); Special Metals Corporation INCOLOY® alloy 925 Technical Bulletin; NACE MR0175 / ISO 15156-3 Table A.10; ASME B31.3 (process piping); API 5CRA (corrosion-resistant alloy line pipe). INCOLOY® and INCO-WELD® are registered trademarks of Special Metals Corporation.
