MA956 AS-EXT
Finish state
UNS S67956 · also PM2000
AS-EXT = as-extruded / unrecrystallized fine-grain
Pick when room- and intermediate-temperature strength and toughness matter more than 1100 °C+ creep life.
Values for the AS-EXT condition
Other MA956 grades and fills
MA956 is listed in 2 conditions; see the grade overview at MA956.
- PM2000
- AS-EXT
Compare all 2 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Plansee-type higher-Al ODS FeCrAl equivalent | Alternative European ODS grade with ~5.5% Al for even better alumina-scale stability in long-term 1200–1300 °C oxidation. | 520 | 640 | 15 | — |
AS-EXTThis page As-extruded / unrecrystallized fine-grain | Pick when room- and intermediate-temperature strength and toughness matter more than 1100 °C+ creep life. | 800 | 950 | 8 | — |
What is MA956 AS-EXT?
MA956 AS-EXT is MA956 supplied in the AS-EXT condition — pick when room- and intermediate-temperature strength and toughness matter more than 1100 °C+ creep life. MA956 AS-EXT has a yield strength of 800 MPa (116 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 95% of composite grades. Elongation at break is 8% and the elastic modulus is 270 GPa (39.2 Msi). MA956 AS-EXT has a density of 7.2 g/cm³ (0.26 lb/in³), heavier than 96% of composite grades.
Advantages
- High strength — 800 MPa (116 ksi), better than 95% of composite grades
- Good UV / weathering resistance — 100/100, better than 93% of composite grades
- High service temperature — 1,000°C (1,832 °F), better than 91% of composite grades
- Ductile — tolerates forming and impact — 8%, better than 90% of composite grades
- Polishes to a fine finish — 60/100, better than 90% of composite grades
Limitations
- Heavy — 7.2 g/cm³ (0.26 lb/in³), worse than 96% of composite grades
- Difficult to machine — 17/100, worse than 81% of composite grades
MA956 AS-EXT properties
Typical room-temperature values for MA956 AS-EXT; 12 are specific to this condition. Other listed values are MA956 reference data and may not represent this condition. Bars are the position among composite grades.
Physical1
MA956 AS-EXT has a density of 7.2 g/cm³ (0.26 lb/in³), heavier than 96% of composite grades.
Mechanical10
MA956 AS-EXT has a yield strength of 800 MPa (116 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 95% of composite grades. Elongation at break is 8% and the elastic modulus is 270 GPa (39.2 Msi).
Thermal5
MA956 AS-EXT is rated for continuous service to 1,000°C (1,832 °F). It conducts heat at 10.5 W/m·K (6.07 BTU/hr·ft·°F), better than 73% of composite grades. Thermal expansion is 11.3 µm/m·K (6.28 µin/in·°F).
Electrical1
MA956 AS-EXT has an electrical resistivity of 1.34×10⁻⁶ Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (70/100), worse than 64% of composite grades. UV resistance is excellent.
Sustainability4
Producing a kilogram of MA956 AS-EXT takes about 260 MJ of energy and emits 18 kg of CO₂ — more than 57% of composite grades. Typical recycled content is 0%.
Manufacturability2
MA956 AS-EXT's machinability is poor (17/100, worse than 81% of composite grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with MA956 AS-EXT
Is MA956 easy to machine?
Machine like a hard ferritic superalloy: rigid setups, carbide or CBN at low speed with heavy positive feed — the Y2O3 dispersoid is highly abrasive and the alloy work-hardens; grinding and EDM are common for finishing.
Can MA956 be welded?
Fusion welding destroys the oxide dispersion in the fused zone and is not recommended; join by diffusion bonding, friction/inertia welding, brazing or mechanical fastening.
Can MA956 be formed, bent or molded?
Supplied as hot-extruded/hot-rolled PM product; hot form above ~800 °C, avoid heavy cold work on coarse recrystallized grain because the ductile–brittle transition lies near or above room temperature.
What surface finishes work on MA956?
Normally used bare — the self-healing alumina scale grown by a 1000–1100 °C air pre-oxidation is the working surface; grit-blast/pickle before pre-oxidation and avoid coatings that react with Al.
MA956 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cr | 18.5 – 21.5 | 20 |
| Alforms protective α-Al2O3 scale | 3.75 – 5.75 | 4.5 |
| Ti | 0.2 – 0.6 | 0.4 |
| Y2O3nano-dispersoid introduced by mechanical alloying | 0.3 – 0.7 | 0.5 |
| C | ≤ 0.1 | 0.03 |
| Niresidual | ≤ 0.5 | — |
| Fe | balance | — |
MA956 AS-EXT — frequently asked
What is MA956 AS-EXT used for?
MA956 AS-EXT is typically used for gas turbine combustor liners, furnace muffles/fixtures and radiant burner tubes. In short: 1250 °C ODS ferritic; self-healing alumina scale; not fusion weldable.
What is the yield strength of MA956 AS-EXT?
MA956 AS-EXT has a typical yield strength of 800 MPa (116 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 95% of composite grades. Strength varies by condition: see the 2 listed tempers.
Is MA956 AS-EXT easy to machine?
Not especially — machinability is rated poor (17/100, worse than 81% of composite grades). Machine like a hard ferritic superalloy: rigid setups, carbide or CBN at low speed with heavy positive feed — the Y2O3 dispersoid is highly abrasive and the alloy work-hardens; grinding and EDM are common for finishing.
Can MA956 AS-EXT be welded?
Fusion welding destroys the oxide dispersion in the fused zone and is not recommended; join by diffusion bonding, friction/inertia welding, brazing or mechanical fastening.
What surface finishes work on MA956 AS-EXT?
Normally used bare — the self-healing alumina scale grown by a 1000–1100 °C air pre-oxidation is the working surface; grit-blast/pickle before pre-oxidation and avoid coatings that react with Al.
Can MA956 AS-EXT be formed, bent or molded?
Supplied as hot-extruded/hot-rolled PM product; hot form above ~800 °C, avoid heavy cold work on coarse recrystallized grain because the ductile–brittle transition lies near or above room temperature.
What is the maximum service temperature of MA956 AS-EXT?
MA956 AS-EXT is rated for continuous use to about 1,000°C (1,832 °F), and briefly to 1,400°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- INCOLOY alloy MA956 datasheet — Special Metals Corporation (2004)
- PM 2000 ODS FeCrAl alloy data — Plansee / Metallwerk Plansee (2000)
- ASM Handbook Vol. 7 — Powder Metallurgy / Mechanical Alloying & ODS alloys — ASM International (2015)
- UNS S67956 alloy registration data — SAE/ASTM Unified Numbering System (2020)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.