Bar and Rod
Plate and Sheet
Strip
Pipe and Tube
Wire
Welding
Powder Material
Cast Products
Forged Products
Fittings
Fastening
Round Bar:
φ2–500 mm, 1–6 m length
Flat/Square Bar:
4–100 mm thickness/width
Hex Bar:
A/F 3–100 mm
Hollow Bar:
OD 20–300 mm
Sheet:
0.3–6 mm thickness
Medium Plate:
6–25 mm thickness
Heavy Plate:
25–100 mm thickness
Standard Strip:
0.05–3 mm thick,
10–600 mm wide
Precision strip:
0.01–0.5 mm thick,
tight tolerance ±0.005 mm
Foil:
0.005–0.1 mm thick
Seamless Tube:
OD 6–450 mm,
WT 1–50 mm,
1–12 m length
Welded Tube:
OD 10–600 mm,
WT 1–20 mm
Capillary Tube:
OD 1–10 mm,
WT 0.1–2 mm
Wire Form:
Cold Drawn Wire,
Bright Wire,
Spring Wire,
Fine Wire,
Ultra-fine Wire
General Diameter:
φ0.1–10 mm
Coil Weight:
50–500 kg,
customizable tolerance
Solid Wire:
φ0.8–4.0 mm
Flux-cored Wire:
φ1.2–4.0 mm
Welding Rod:
φ2.0–5.0 mm
Powder Form:
AM 3D Printing Powder,
Spherical Powder,
Gas-atomized Powder,
Water-atomized Powder
Particle Size:
10–150 μm
Sphericity:
≥90% for AM grade
Cast Ingot:
φ200–800 mm
Precision Casting:
min wall 0.5 mm
Cast Pipe:
OD 100–600 mm,
WT 10–50 mm
Forged Bar:
Φ35–500 mm
Forged Ring:
OD 200–2000 mm
Forging Weight:
1–5000 kg
Fittings Form:
Elbow, Tee, Reducer, Flange, Cap, Outlet, Lap Joint
Size range:
1/2''–24'' (DN15–DN600)
Wall thickness:
Sch10–Sch160, STD, XS, XXS
Pressure Class:
150–2500 LB
Fastening Form:
Bolt, Nut, Screw, Stud, Washer, Pin, Rivet
Metric: M3–M64
Imperial: #4–2.5''
Length: 6–500 mm
Alloy 890 is a high-chromium nickel-iron-chromium solid-solution heat-resistant alloy. This datasheet presents the material within the American (ASTM / ASME / UNS) standard system.
The latest addition to the INCOLOY family of heat-resistant alloys (US Patent 5,873,950), Alloy 890 offers high strength together with excellent resistance to oxidation, carburisation and sulfidation at temperatures up to 1200 °C (2200 °F). It pairs the high chromium content of alloy 803 with enhanced properties from additions of silicon, molybdenum and niobium, which improve creep and stress-rupture resistance above about 980 °C (1800 °F). The very high chromium content promotes a dense, adherent chromium-oxide (Cr₂O₃) scale that gives long service life in aggressive furnace and combustion environments. It is a single-phase, solid-solution alloy — not hardenable by heat treatment — and is supplied in the annealed condition.
Typical applications include domestic and industrial sheathed heater elements, furnace hardware, hot-gas components, and other high-temperature equipment in oxidising, carburising and sulfidising atmospheres.
| Property | Value | Unit |
|---|---|---|
| Density | 7.85 | g/cm³ |
| Melting range | 1360–1400 | °C |
| Elastic modulus | 193 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 15.0 | µm/m·°C |
| Thermal conductivity (20 °C) | 11.5 | W/m·K |
| Specific heat (20 °C) | 460 | J/kg·K |
| Structure | Austenitic (FCC), single phase | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | 38.0 | 44.0 | Austenite stabiliser; high-temperature resistance |
| Iron | Fe | Balance | — | Base element |
| Chromium | Cr | 25.0 | 29.0 | Cr₂O₃ scale; oxidation / sulfidation resistance |
| Molybdenum | Mo | 1.0 | 3.0 | Solid-solution / creep strengthening |
| Niobium | Nb | 0.5 | 2.0 | Creep / stress-rupture strengthening |
| Silicon | Si | 1.0 | 2.5 | Oxidation / carburisation resistance |
| Manganese | Mn | — | 1.50 | Deoxidiser |
| Carbon | C | — | 0.10 | Carbide formation |
Annealed condition, typical values for UNS N08890.
| Condition | Property | Value |
|---|---|---|
| Annealed | Tensile strength (UTS) | ≥550 MPa (80 ksi) |
| Annealed | 0.2% yield strength | ≥240 MPa (35 ksi) |
| Annealed | Elongation at break | ≥30 % |
| Elevated temperature | Creep / stress-rupture | Superior; better than 800HT |
| — | Elastic modulus | 193 GPa |
Confirm against the mill test report. Creep and stress-rupture properties are similar to alloy 803 and slightly higher than alloy 800HT; molybdenum and niobium enhance rupture strength above 980 °C.
| Environment | Performance | Notes |
|---|---|---|
| High-temperature oxidation | Excellent | Cr₂O₃ scale; to about 1200 °C |
| Carburisation | Excellent | High Cr + Si resist carbon ingress |
| Sulfidation | Excellent | Superior to many stainless steels |
| Thermal cycling | Very Good | Adherent, stable scale |
| Aqueous / liquid service | Limited | Not intended for strong aqueous corrosion |
The very high chromium content, supported by silicon, gives a dense protective oxide scale and outstanding resistance to oxidation, carburisation and sulfidation to about 1200 °C — outperforming conventional stainless steels such as 310S in sulfur-bearing atmospheres.
A single-phase solid-solution alloy; not hardenable by precipitation. Properties are set by annealing.
Anneal Anneal (solution anneal) at approximately 1121–1204 °C (2050–2200 °F), holding for a time commensurate with section thickness, followed by rapid cooling in air or water quench. The alloy can be sensitised by carbide precipitation during prolonged exposure to intermediate temperatures, though sensitisation is rarely a concern for the high-temperature service in which it is used. Strength is otherwise developed by cold work.
Good weldability using the conventional procedures for nickel-iron-chromium heat-resistant alloys; matching or compatible filler is used. The alloy can be formed, machined and welded with standard nickel-alloy practice.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Good | Matching / compatible filler |
| GMAW / MIG | Good | Compatible filler |
| SMAW / stick | Acceptable | Compatible electrode |
Weld with standard nickel-alloy practice and clean surfaces; post-weld annealing may be applied where required.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Machinability | Moderate; work-hardens, rigid setups, sharp tooling |
| Speeds | Slower than carbon steel; positive feeds |
| Coolant | Ample coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | Good; work-hardens, anneal between heavy operations |
| Hot forming | Readily formed hot; anneal afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Heating elements | Domestic / industrial sheathed heaters | Oxidation resistance + heat efficiency |
| Industrial furnace | Furnace hardware, fixtures | Oxidation / carburisation resistance to 1200 °C |
| Petrochemical | Hot-gas and combustion components | Sulfidation + carburisation resistance |
| Power generation | High-temperature parts | Creep + oxidation resistance |
| Product Form | Standard / Designation | Notes |
|---|---|---|
| Plate and sheet | UNS N08890 | Hot-rolled, solution annealed |
| Tube and pipe | UNS N08890 | Cold-pilgered, solution annealed |
| Bar, rod and wire | UNS N08890 | Special Metals product |
| Material designation | UNS N08890 | US Patent 5,873,950 |
High-chromium nickel-iron-chromium solid-solution heat-resistant alloy. UNS N08890.
| Alloy | Ni % | Cr % | Strengthening | Best Used For |
|---|---|---|---|---|
| Alloy 890 | 38–44 | 25–29 | Solid solution (Si, Mo, Nb) | Oxidation/carburisation/sulfidation to 1200 °C; heaters, furnaces |
| Alloy 803 | 32–37 | 25–29 | Solid solution | High-temperature oxidation / carburisation |
| Alloy 800HT | 30–35 | 19–23 | Solid solution | High-temperature creep service |
| Alloy 800H | 30–35 | 19–23 | Solid solution | General high-temperature service |
| Alloy 310S | 19–22 | 24–26 | Solid solution | High-temperature oxidation resistance |
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