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Premium Incoloy 926 (UNS N08926) bar, tube, plate supplier. Super-austenitic stainless steel for corrosive environments. ASTM/ASME compliant. Get quote.
Shanghai Hangbo Alloy Group Co., Ltd. is an ISO 9001:2015 certified manufacturer and global supplier of premium Incoloy 926 (UNS N08926 / W.Nr. 1.4529) round bars, plates, sheets, seamless tubes and welded pipes. As a nitrogen-alloyed super-austenitic stainless steel with PREN ≥ 44, Incoloy 926 offers outstanding resistance to seawater, sour gas and aggressive chloride media — the proven material for offshore platforms, desalination and chemical tankers.
Standards
- ASTM B649 — Bar, Rod, Wire (Hot-Worked / Annealed)
- ASTM B625 — Plate, Sheet, Strip
- ASME SB649 / SB625 — Pressure Vessel Applications
- UNS N08926 / W.Nr. 1.4529 / EN 1.4529
- NACE MR0175 / ISO 15156 — Sour Service Approved
Precise ASTM Chemical Composition (%)
| Element | Range / Max |
|---|---|
| Iron (Fe) | Balance |
| Nickel (Ni) | 24.0 – 26.0 |
| Chromium (Cr) | 19.0 – 21.0 |
| Molybdenum (Mo) | 6.0 – 7.0 |
| Nitrogen (N) | 0.15 – 0.25 |
| Copper (Cu) | 0.50 – 1.50 |
| Manganese (Mn) | 2.0 max |
| Silicon (Si) | 0.50 max |
| Carbon (C) | 0.020 max |
| Phosphorus / Sulfur (P/S) | 0.030 / 0.010 max |
Physical & Mechanical Properties
| Property | Typical Value (Min) |
|---|---|
| Tensile Strength (Annealed, ASTM B649) | 650 MPa (94 ksi) |
| Yield Strength (0.2% Offset) | 295 MPa (43 ksi) |
| Elongation (in 2") | 35% |
| Hardness (Brinell) | ≤ 223 HB |
| PREN (Pitting Resistance Equivalent) | ≥ 44 |
| Density | 8.10 g/cm³ |
| Melting Range | 1320 – 1390 °C |
Depth Characteristics
- Seawater-Grade Resistance: PREN ≥ 44 with 6.5% Mo and nitrogen delivers proven resistance to pitting and crevice corrosion in full-strength seawater.
- Sour Gas Excellence: Approved for NACE MR0175/ISO 15156 sour service, resisting sulfide stress cracking (SSC) in H2S environments.
- Strong in Acids: Good resistance to sulfuric, phosphoric and organic acids over a wide concentration range.
- High Strength: Nitrogen solution strengthening provides roughly 25% higher yield strength than 316L/317L grades.
- Good Fabricability: Weldable by all standard processes with over-alloyed fillers; retains corrosion resistance in as-welded condition.
Manufacturing Process — Forging & Heat Treatment
Incoloy 926 is melted by AOD/VOD refining with strict nitrogen control, hot-forged at 1100–1250°C and finished above 950°C. All products are solution annealed at 1120–1170°C followed by rapid water quenching to keep the fully austenitic, precipitate-free microstructure. Bars are peeled and straightened; tubes are cold-pilgered, pickled and passivated for maximum pitting resistance.
Testing & Inspection Methods — PMI / UT / RT
- PMI (Positive Material Identification): 100% XRF/arc-OES verification of Ni, Cr, Mo, N, Cu on every heat.
- UT (Ultrasonic Testing): Full-length ultrasonic examination of bar and tube per ASTM E213/E2375 for internal soundness.
- RT (Radiographic Testing): Radiographic inspection of welded pipe seams per ASME Section V for pressure applications.
- Plus: tensile testing, ASTM G48 pitting corrosion tests (critical pitting temperature), ASTM A262 intergranular corrosion tests, ferrite measurement on welds, hydrostatic testing and 100% dimensional inspection; EN 10204 3.1/3.2 certificates supplied.
High-Frequency Application Scenarios
- Offshore Oil & Gas: Seawater piping systems, firewater deluge lines, heat exchangers and splash-zone components on platforms.
- Desalination Plants: Evaporator shells, tube bundles and piping in SWRO and thermal desalination.
- Chemical Tankers: Cargo tanks and piping for organic and inorganic acids in maritime transport.
- FGD & Pulp Bleaching: Scrubber internals and bleaching-stage equipment in chloride-rich media.
- Onshore Sour Fields: Wellhead equipment, flowlines and process piping for H2S/CO2 service per NACE MR0175.
6+ Professional FAQs
1. Is Incoloy 926 a stainless steel or a nickel alloy?
It is classified as a super-austenitic stainless steel (Fe-based, 25% Ni) per ASTM B649, bridging the gap between conventional 6Mo stainless and solid nickel alloys.
2. How does 926 compare with 254SMO (UNS S31254)?
926 has higher Ni (25% vs 18%) and Mo (6.5% vs 6.1%), giving better resistance to chloride SCC and superior performance in seawater and sour gas service.
3. What does PREN ≥ 44 mean?
Pitting Resistance Equivalent Number — a calculated index of Cr + 3.3Mo + 16N indicating strong resistance to chloride pitting and crevice corrosion.
4. Is Incoloy 926 approved for sour service?
Yes — it is listed in NACE MR0175/ISO 15156 for H2S service with defined hardness and environmental limits.
5. Which filler should be used to weld 926?
Over-alloyed nickel fillers such as ERNiCrMo-3 (Alloy 625) or ERNiCrMo-13 (Alloy 59) are recommended to maintain corrosion resistance in weld metal.
6. What is the maximum chloride content and temperature?
926 handles full-strength seawater at ambient temperature and chloride-bearing media up to ~60°C in crevice conditions; performance depends on geometry and aeration.
7. Which product forms are available?
Round bar (ASTM B649), plate/sheet (ASTM B625), seamless and welded tube/pipe, plus forgings and flanges — all with full traceability.
Supply List
- Round Bar: Φ6mm – Φ500mm, peeled/ground
- Plate / Sheet: Thickness 1mm – 80mm, cut-to-size
- Seamless Tube: OD 6mm – 219mm
- Welded Pipe: OD 60mm – 610mm
- Forgings / Flanges: Custom per drawings
Need certified Incoloy 926 for your offshore or desalination project? Contact Shanghai Hangbo Alloy Group for instant quotations, stock availability and mill certificates — quick response within 10 minutes.
