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 MA956 is an oxide-dispersion-strengthened (ODS) iron-chromium-aluminium alloy produced by mechanical alloying. This datasheet presents the material within the American (ASTM / ASME / UNS) standard system.
Originally developed as an aerospace superalloy and now used across industry, Alloy MA956 combines high strength and good fabricability with outstanding resistance to prolonged exposure at very high temperature. Its exceptional properties result from the mechanical-alloying process, in which high-energy milling incorporates a fine, stable dispersion of yttrium-oxide (Y₂O₃) particles into a highly corrosion-resistant ferritic Fe-Cr-Al matrix. The high aluminium content forms a stable, self-healing alumina (Al₂O₃) scale that provides excellent oxidation, carburisation and hot-corrosion resistance to about 1300 °C (2400 °F), while the oxide dispersoid sustains significant creep strength up to the alloy's unusually high melting point of about 1482 °C (2700 °F); thicker sections may be used to about 1370 °C. It is supplied in the recrystallised condition.
Typical applications include furnace hearth rollers, radiant tubes, muffles, fluidised-bed retorts, heat-treatment baskets and mesh belts, heat shields, burner nozzles, thermowell sensor tubes, and gas-turbine and diesel-engine combustion-chamber components.
| Property | Value | Unit |
|---|---|---|
| Density | 7.25 | g/cm³ |
| Melting point | 1482 | °C |
| Elastic modulus | 269 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 10.9 | µm/m·°C |
| Thermal conductivity (20 °C) | 16.0 | W/m·K |
| Specific heat (20 °C) | 600 | J/kg·K |
| Structure | Ferritic (BCC) + oxide dispersoid | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Iron | Fe | Balance | — | Base element |
| Chromium | Cr | 18.5 | 21.5 | Oxidation / corrosion resistance |
| Aluminium | Al | 3.75 | 5.75 | Forms protective Al₂O₃ scale |
| Titanium | Ti | 0.20 | 0.60 | Minor addition |
| Yttrium oxide | Y₂O₃ | 0.30 | 0.70 | Oxide dispersoid; creep strength, stability |
| Carbon | C | — | 0.10 | Residual impurity |
Recrystallised condition, typical values for UNS S67956.
| Condition | Property | Value |
|---|---|---|
| Recrystallised | Tensile strength (UTS), RT | ≥585 MPa (85 ksi) |
| Recrystallised | 0.2% yield strength, RT | ≥505 MPa (73 ksi) |
| Recrystallised | Elongation at break | ≥15 % |
| At 1100 °C | Tensile strength (UTS) | retains useful strength |
| — | Elastic modulus | 269 GPa |
Confirm against the mill test report. The oxide dispersoid provides exceptional creep strength and microstructural stability to very high temperature, well beyond conventional wrought alloys.
| Environment | Performance | Notes |
|---|---|---|
| High-temperature oxidation | Excellent | Self-healing Al₂O₃ scale to ~1300 °C |
| Carburisation | Excellent | High Cr + Al |
| Sulfidation / hot corrosion | Excellent | Stable protective scale |
| Low-oxygen / cyclic atmospheres | Excellent | Alumina forms even at low pO₂ |
| Molten-salt / aggressive aqueous | Limited | Not intended for severe aqueous service |
The combination of high aluminium and chromium, together with the yttrium-oxide dispersoid, forms a stable, adherent and self-healing alumina scale, giving outstanding resistance to oxidation, carburisation and hot corrosion at temperatures far above those tolerated by conventional alloys.
An oxide-dispersion-strengthened ferritic alloy; strength derives from the mechanically alloyed oxide dispersoid and grain structure, not from precipitation or quench hardening.
Recrystallisation Anneal A high-temperature recrystallisation anneal (typically about 1300 °C) develops the large, elongated grain structure that gives the alloy its high-temperature creep strength. The yttrium-oxide dispersoid remains stable through this treatment and in service. The alloy cannot be hardened by conventional solution and ageing or by quenching.
Fusion welding is generally not recommended, because melting destroys the fine oxide dispersion and the recrystallised grain structure on which the high-temperature properties depend. Joining is by mechanical means, brazing, or solid-state processes such as friction (stir) welding.
| Joining Process | Applicability | Notes |
|---|---|---|
| Brazing | Good | Matching-composition brazing alloys available |
| Friction / solid-state welding | Acceptable | Preserves dispersoid better than fusion |
| Fusion welding | Not recommended | Destroys oxide dispersion and grain structure |
Join by brazing, mechanical means or solid-state welding; avoid fusion welding, which degrades the ODS microstructure.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Machinability | Fair; sharp carbide tooling, rigid setups |
| Note | High modulus and hardness; grinding may be preferred |
| Coolant | Ample coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | Limited; performed before final recrystallisation where possible |
| Hot forming | Performed hot; recrystallisation anneal develops final grain structure |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Industrial furnaces | Hearth rollers, radiant tubes, muffles | Oxidation + creep to ~1300 °C |
| Heat treatment | Baskets, mesh belts, fixtures | High-temperature stability |
| Energy / gas turbine | Combustion chambers, heat shields | Oxidation + creep strength |
| Process / sensors | Burner nozzles, thermowell sensor tubes | High-temperature corrosion resistance |
| Product Form | Standard / Designation | Notes |
|---|---|---|
| Bar and rod | UNS S67956 | Mechanically alloyed |
| Sheet, plate and strip | UNS S67956 | Recrystallised |
| Tube | UNS S67956 | — |
| Material designation | UNS S67956 | ODS Fe-Cr-Al alloy |
Oxide-dispersion-strengthened Fe-Cr-Al alloy. UNS S67956.
| Alloy | Type | Strengthening | Max Service | Best Used For |
|---|---|---|---|---|
| Alloy MA956 | ODS Fe-Cr-Al (ferritic) | Y₂O₃ dispersoid | ~1300 °C | Extreme high-temperature oxidation + creep; furnace, combustion |
| Alloy MA754 | ODS Ni-Cr | Y₂O₃ dispersoid | ~1150 °C | Nickel-base ODS; gas-turbine vanes |
| Kanthal APM | FeCrAl (powder) | FeCrAl alumina former | ~1250 °C | Heating elements, furnace parts |
| Alloy 800H | Austenitic Fe-Ni-Cr | Solid solution | ~1100 °C | General high-temperature service |
| Alloy 601 | Ni-Cr-Fe + Al | Solid solution | ~1200 °C | High-temperature oxidation resistance |
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