TorqBolt supplies Incoloy 925 (UNS N09925) tube in seamless, welded and cold-drawn forms ASTM B829 (general nickel-alloy tube), ASTM B704 (welded tube, filler INCO-WELD 725NDUR) and customer-nominated specifications. The cold-drawn variant in solution-annealed + aged (CW+S+A) condition is the workhorse form for downhole oil & gas service, the cold-work step lifts yield strength above 120 ksi while the controlled age cycle keeps hardness within the 35 HRC NACE MR0175 sour-service cap. Used for downhole production / injection tubing, subsea control-line tubing, hydraulic-control jumpers, instrument tubing, packer tail pipes, completion-tool sleeves, MWD/LWD housings (low magnetic permeability), and seamless-pipe replacements where small OD + tight tolerance is required. Every order ships with EN 10204 3.1 manufacturer's MTC documenting actual heat-lot chemistry, mechanical results and heat-treatment cycle; 3.2 with TPI witness on request. NACE-stamped MTC for sour-service projects.
Need Incoloy 925 tube? Email info@torqbolt.com with OD, wall thickness, length, quantity and any condition requirement (annealed / aged / cold-drawn + aged). WhatsApp +91-22-66157017.
Tube Sizes & Forms
| Form | OD Range | Wall Thickness | Standard |
|---|---|---|---|
| Seamless tube (extruded + cold-pilger reduced) | 3 mm to 75 mm OD | 0.5 mm to 8 mm | ASTM B829 / B622-equivalent |
| Cold-drawn tubing (S+A condition) | 3 mm to 75 mm OD | 0.5 mm to 8 mm | ASTM B829 / customer spec |
| Welded tube (TIG) | 10 mm to 200 mm OD | 1 mm to 12 mm | ASTM B704 (filler INCO-WELD 725NDUR) |
| Coiled tubing | 1/4" to 2" OD | 0.065" to 0.250" | Customer spec; lengths to 5000 m on coil |
| Capillary tubing (chemical injection) | 1/8" to 1/2" OD | 0.035" to 0.083" | Customer + ASME B31.3 |
| Lengths | Random (5–7 m) / double random (10–14 m) / cut to length / continuous coil for control-line service | ||
Mechanical Properties, By Condition
| Condition | UTS, ksi (MPa) | 0.2% YS, ksi (MPa) | Hardness, HRC | Elongation |
|---|---|---|---|---|
| Solution Annealed only (SA) | 110 (760) | 50 (345) | 22 | 30% |
| SA + Aged (S+A) | 165 (1140) | 110 (760) | 32–35 | 20% |
| Cold-drawn + Aged (CW+S+A) | 172 (1189) | 120 (830) | 35 | 27% |
The CW+S+A cold-drawn condition delivers ~9% higher yield strength than standard aged plate / bar, a useful margin for downhole tubing applications. See full mechanical properties page for elevated-temperature data and Charpy envelope.
Sour-Service Qualification
Incoloy 925 tube is qualified for sour service per NACE MR0175 / ISO 15156-3 Table A.10 with the standard envelope (1000 psi H₂S, 400°F, chloride to saturation, 35 HRC max). Cold-drawn + aged tubing has been tested per Special Metals C-ring data (Tables 8 & 9) showing no sulfide stress cracking up to 46 HRC in cold-worked + aged condition in 5% NaCl + 0.5% acetic acid + H₂S. For project-specific high-strength sour-service tubing above the 35 HRC cap, project qualification per ISO 15156-3 Annex B Section 6 is supported by the Special Metals test data.
Tube Applications
- Downhole production tubing: Sour gas wells with H₂S to 1000 psi
- Subsea control-line tubing: Hydraulic + chemical injection from topside to subsea Christmas tree
- Hydraulic-control jumpers: Tree-to-manifold control conduits
- Instrument tubing: Pressure / temperature / flow sensors in sour process service
- Capillary chemical-injection tubing: Continuous injection of corrosion inhibitors / scale inhibitors / hydrate inhibitors
- Packer tail pipes: Below-packer flow conduit in completion strings
- Completion-tool sleeves: Inner sleeves of sliding sleeves, packers and gas-lift mandrels
- MWD / LWD downhole tool housings: Low magnetic permeability (μr ~1.005) for instrument-signal integrity
- Heat-exchanger tube bundles: Sour-service shell-and-tube exchangers
- Coiled tubing service: Sour-well intervention and completion operations
Why Cold-Drawn + Aged Is the Standard for Downhole Tubing
- Higher strength: 120 ksi YS (vs 110 ksi for standard aged) gives extra margin for HPHT well loading.
- Tighter dimensional tolerance: Cold drawing through dies gives ±0.05 mm OD tolerance vs ±0.5 mm for hot-rolled tube.
- Better surface finish: Cold-drawn tubes have Ra 0.4–0.8 μm without further finishing, vs 1.6–3.2 μm for hot-rolled.
- Sour-service qualification preserved: Properly controlled cold work + age cycle keeps final hardness within the 35 HRC NACE cap.
- NACE TM0177 verified: Cold-drawn tube hardness verified by C-ring testing per Special Metals Tables 8 & 9, no SSC up to 46 HRC.
Documentation Package
- EN 10204 3.1 manufacturer's MTC (3.2 with DNV / Bureau Veritas / Lloyd's / TUV witness on request)
- Heat-lot chemistry vs UNS N09925 limits
- Tensile + hardness results per heat / per heat-treatment lot per OD-thickness combination
- Heat-treatment furnace chart-recorder traces (anneal + age cycles)
- Cold-drawing reduction record (for CW+S+A tubing)
- Hydrotest at 1.5× design pressure ASTM B829 (on request)
- Eddy-current inspection per ASTM E309 / E426 (on request)
- NACE MR0175 Table A.10 reference (sour-service orders)
- Tube marking with heat number, OD × wall, length, MTC reference
Frequently Asked Questions
What's the difference between Incoloy 925 pipe and tube? Distinction is by use: tube is dimensional (OD × wall, often small diameter, tight tolerance, supplied for further fabrication or instrument use); pipe is sized to nominal pipe size (NPS, schedule, often larger diameter, supplied for piping systems). For OD < 75 mm (3"), the term "tube" is more common; for OD ≥ 75 mm, "pipe" is more common. Both are made to the same chemistry and mechanical specifications.
Can Incoloy 925 tube be supplied in coils for control-line service? Yes, cold-drawn tube in OD 1/4" to 1" can be supplied in continuous coils up to 5000 m for subsea control-line and chemical-injection service. The coil is supplied on a transport reel; un-coiling on site is performed at controlled tension to avoid kinking.
What's the typical lead time for Incoloy 925 cold-drawn tube? Standard sizes (3 mm to 50 mm OD): 12–16 weeks. Larger / thicker / non-standard sizes: 18–22 weeks. Coil tubing for subsea control-line: 16–20 weeks. Lead time is constrained by the cold-pilger reduction and age-cycle furnace capacity.
Is Incoloy 925 tube available in ASTM B622 (general seamless requirements)? Yes, ASTM B622 is the general-requirements specification covering all wrought nickel-alloy seamless tube; it pairs with ASTM B829 (which adds the UNS N09925-specific requirements). Tube is supplied to both standards on request.
Related Products
- Incoloy 925 pipe, larger NPS for piping systems
- Incoloy 925 plate, flat-product strip stock for welded tube
- Incoloy 925 bar, for tube fittings + machined parts
- Incoloy 925 forgings, tube end fittings + couplings
- Downhole oil & gas applications, tube use cases
Request a Quote
For Incoloy 925 tube with full MTC documentation:
- Email: info@torqbolt.com
- Phone: +91-22-66157017
- WhatsApp: +91-22-66157017
Specify OD, wall thickness, length (random / cut to length / coil), quantity, condition (annealed only / aged / cold-drawn + aged), applicable standards (ASTM B829 / B622 / B704 / B983, API 6A / API 5CRA, NACE MR0175), end preparation (plain / NPT / API rotary-shouldered / premium), required NDE (eddy current / hydrotest / UT), and MTC level (3.1 or 3.2 with TPI witness).
References: ASTM B829 (general requirements for wrought nickel-alloy tube); ASTM B622 (seamless wrought nickel-alloy tube); ASTM B704 (welded UNS N09925 tube); ASTM B983 (strip source for welded tube); Special Metals Corporation INCOLOY® alloy 925 Technical Bulletin, Tables 6 / 8 / 9; NACE MR0175 / ISO 15156-3 Table A.10. INCOLOY® and INCO-WELD® are registered trademarks of Special Metals Corporation.
