TorqBolt supplies Incoloy 925 (UNS N09925) plate to ASTM B983 (Standard Specification for Precipitation-Hardened UNS N09925 Plate, Sheet, and Strip). Plate is hot-rolled, solution-annealed and may be supplied in either Class 1 (solution-annealed only, ~110 ksi UTS) or Class 2 (solution-annealed and aged, 165 ksi UTS minimum) condition. Used for pressure vessel cladding, sour-service vessel internals, separator components, downhole tool body fabrications, marine flange faces, heat exchanger tube sheets, transition pieces and welded-pipe strip stock. Every plate ships with EN 10204 3.1 manufacturer's MTC documenting actual heat-lot chemistry, mechanical results and heat-treatment cycle vs ASTM B983, API 6A, NACE MR0175 requirements; 3.2 with TPI witness on request. NACE-stamped MTC for sour-service projects.
Need Incoloy 925 plate? Email info@torqbolt.com with thickness, plate size, surface finish, condition (Class 1 annealed or Class 2 aged), quantity and MTC level. WhatsApp +91-22-66157017.
Plate Sizes & Forms
| Parameter | Standard Range |
|---|---|
| Thickness | 5 mm to 50 mm (heavier on request to 100 mm) |
| Width | 1000 mm to 2500 mm |
| Length | 2000 mm to 10,000 mm (custom on request) |
| Surface finish | Hot-rolled descaled (1D), pickled, ground, polished (#4 / #6 / #8) |
| Edge condition | Mill edge, sheared, sawn, ground |
| Heat-treatment condition | Class 1 (annealed only) or Class 2 (annealed + aged) |
Mechanical Properties ASTM B983
| Property | Class 1 (Annealed only) | Class 2 (Annealed + Aged) |
|---|---|---|
| Tensile Strength min | 110 ksi (760 MPa) | 165 ksi (1140 MPa) |
| 0.2% Yield Strength min | 45 ksi (310 MPa) | 110 ksi (760 MPa) |
| Elongation in 4D min | 30% | 18% |
| Hardness max (sour service) | 32 HRC | 35 HRC |
See full mechanical properties page for elevated-temperature data and Charpy envelope. The 35 HRC sour-service cap (Class 2) is verified by 100% Rockwell hardness inspection per ASTM E18 with values reported on every plate MTC.
Chemical Composition (UNS N09925)
Identical chemistry envelope to ASTM B805 bar / forgings: Ni 42–46%, Cr 19.5–22.5%, Fe 22% min (bal), Mo 2.5–3.5%, Cu 1.5–3.0%, Ti 1.9–2.4%, Al 0.1–0.5%, with C 0.03 max and S 0.03 max. See the full chemical composition page for element-by-element commentary.
Sour-Service Compliance
Incoloy 925 plate is qualified for sour service per NACE MR0175 / ISO 15156-3 Table A.10 with the standard envelope: H₂S partial pressure up to 1000 psi (6.9 MPa), temperature up to 400°F (204°C), chloride to saturation, hardness cap 35 HRC max in Class 2 (aged) condition. NACE-stamped MTC included on every sour-service plate order.
Plate Applications
- Pressure-vessel shells: Sour-service separators, knock-out drums, scrubbers per API 6A / ASME Section VIII
- Cladding plate: Carbon-steel substrate clad with Incoloy 925 surface (3–6 mm clad layer) for cost-effective sour-service vessels
- Tube sheets: Shell-and-tube heat exchangers in sour duty, with Incoloy 925 tube bundle
- Transition pieces: Welded transitions between dissimilar materials (carbon steel to Incoloy 825 piping, etc.)
- Downhole tool bodies: Machined from plate stock when forging is impractical
- Marine flange faces / pad eyes: Splash-zone and submerged service per marine application page
- Strip-rolled welded pipe stock: Source plate for ASTM B704 welded pipe
- Pulp & paper digester linings: Reducing-acid + chloride mixed environments
Plate vs Sheet vs Strip
| Form | Thickness | Width | Typical Use |
|---|---|---|---|
| Plate | 5 mm to 50 mm | up to 2500 mm | Pressure-vessel shells, cladding, tube sheets |
| Sheet | 0.5 mm to 5 mm | up to 2000 mm | Cladding, transition pieces, formed components |
| Strip (in coil) | 0.1 mm to 5 mm | 50 mm to 1500 mm | Seam-welded pipe / tube, springs, formed parts |
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 ASTM B983
- Tensile + hardness results per heat / per heat-treatment lot per thickness
- Heat-treatment furnace chart-recorder traces (anneal + age cycles for Class 2)
- Bend test (sheet only, 180° over 1t mandrel per ASTM E290)
- NDE results: liquid penetrant (S5 surface) on request, ultrasonic (S6 volume) on plates >10 mm on request per ASTM A578
- NACE MR0175 Table A.10 reference (sour-service orders)
- Plate marking: heat number, UNS N09925, ASTM B983, Class 1 / 2, thickness × W × L
Frequently Asked Questions
Class 1 vs Class 2, which should I order? Class 2 (annealed + aged) for finished pressure-vessel plate where the plate is the final component; Class 1 (annealed only) when there's downstream forming + welding + customer-side ageing planned. Most pressure-vessel orders are Class 2; cladding-plate orders are typically Class 1 (so the cladding can be re-annealed after explosive bonding to the carbon-steel substrate).
Is Incoloy 925 plate ASME-code-stamped? Yes, UNS N09925 is covered under ASME Section II Part B (specification SB-983) and ASME Section VIII Division 1/2/3 with maximum allowable stress values published in ASME Section II Part D Table 1B. For nuclear service, ASME III Code Case 2727 applies. TorqBolt is ASME-certified manufacturer for these code stamps.
What surface finish do you supply? Standard hot-rolled descaled (1D) for plate >5 mm; cold-rolled annealed (2B) for sheet ≤5 mm. Polished finishes (#4 satin, #6 dull, #8 mirror) on request, typically with a lead-time addition. Pickled-and-passivated to ASTM A380 / A967 on request for vessel-internal sour-service applications.
Can the plate be supplied with NORSOK MDS A30? Yes, for North Sea projects, plate is supplied with NORSOK M-630 MDS A30 documentation alongside the standard ASTM B983 MTC. TorqBolt is NORSOK M-650 qualified manufacturer.
Related Products
- Incoloy 925 sheet & strip, thinner gauges
- Incoloy 925 pipe, seamless / welded made from B983 strip
- Incoloy 925 tube, small-diameter tubing
- Incoloy 925 bar, ASTM B805 round / hex / square
- Incoloy 925 forgings, flanges, fittings
Request a Quote
For Incoloy 925 plate with full MTC documentation:
- Email: info@torqbolt.com
- Phone: +91-22-66157017
- WhatsApp: +91-22-66157017
Specify thickness, width × length, quantity, condition (Class 1 annealed or Class 2 aged), surface finish, applicable standards (ASTM B983, API 6A, NACE MR0175, NORSOK M-630 MDS A30, ASME II Part B / Section VIII), required NDE (liquid penetrant / UT / RT) and MTC level (3.1 or 3.2 with TPI witness).
References: ASTM B983 Standard Specification for Precipitation Hardened UNS N09925 Plate, Sheet, and Strip; Special Metals Corporation INCOLOY® alloy 925 Technical Bulletin; NACE MR0175 / ISO 15156-3 Table A.10; ASTM A480 (general flat-product requirements); ASTM A578 (UT inspection); ASTM A380 / A967 (passivation). ASME Section II Part B (SB-983); ASME Section VIII Div 1; ASME III Code Case 2727. INCOLOY® is a registered trademark of Special Metals Corporation.
