Nickel Alloy MAR-M247
UNS N07247 · also 5355
MAR-M247 (UNS N07247, AMS 5355) is a hafnium-bearing, γ′-strengthened nickel superalloy cast in equiaxed, directionally solidified and low-carbon DS forms, and also processed by additive manufacturing.
Reference datasheet — MAR-M247 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the CC-HT condition
MAR-M247 tempers and conditions
MAR-M247 is supplied in 7 conditions, soft to hard. CC-HT is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Laser powder-bed fusion, as-built | Only for development/repair hardware — fine dendritic structure gives high hardness but very low ductility and residual microcracking. | 720 | 820 | 2 | 45 HRC | 1.3 % IACS |
Spheroidize annealed | Pick only for non-critical or low-temperature hardware, or as the intermediate state before HIP/heat treatment. | 790 | 920 | 6 | 41 HRC | 1.4 % IACS |
CC-HTDefault Conventionally (equiaxed) investment cast + full heat treatment | Standard stocked/ordered condition for equiaxed MAR-M247 turbine vanes, blades and integral wheels. | 815 | 965 | 7 | 42 HRC | — |
equiaxed cast, hot isostatically pressed then solution + aged | Choose when casting microporosity must be closed for better ductility and fatigue/creep scatter. | 830 | 1,000 | 9 | 43 HRC | 1.4 % IACS |
laser powder-bed fusion + HIP + solution and age | Post-processed AM condition used to close cracks/porosity and recover cast-like ductility and creep strength. | 850 | 1,000 | 6 | 43 HRC | 1.4 % IACS |
Directionally solidified (columnar grain, properties along <001> growth… | Use for high-pressure turbine blades where transverse grain boundaries and thermal-fatigue cracking must be eliminated. | 895 | 1,035 | 10 | 43 HRC | 1.4 % IACS |
Low-carbon variant (CM247LC / MAR-M247 LC), directionally solidified +… | Low C/Zr/B chemistry developed to avoid DS grain-boundary cracking in thin-wall blades; best DS creep life. | 900 | 1,050 | 12 | 42 HRC | 1.4 % IACS |
What is MAR-M247?
MAR-M247 (UNS N07247, AMS 5355) is a hafnium-bearing, γ′-strengthened nickel superalloy cast in equiaxed, directionally solidified and low-carbon DS forms, and also processed by additive manufacturing. Heat-treated material gives 815 MPa yield, 965 MPa tensile, 7 % elongation, 42 HRC and 205 GPa modulus, with gas-path service to 1000 °C, and it is used mainly for turbine blades and vanes. Ductility is low, fusion welding is impractical because Al+Ti exceeds 6 %, and machining is largely restricted to grinding, EDM and ECM. IN-100 and Rene 80 are the nearest cast alternatives. MAR-M247 has a density of 8.54 g/cm³ (0.309 lb/in³), heavier than 65% of nickel alloy grades. It melts at 1,315°C (2,399 °F). MAR-M247 has a yield strength of 815 MPa (118 ksi) and a tensile strength of 965 MPa (140 ksi) — stronger than 85% of nickel alloy grades. Elongation at break is 7% and the elastic modulus is 205 GPa (29.7 Msi).
What is MAR-M247 used for?
- Turbine blades
- Turbine vanes
- Industrial gas turbine hot components
Advantages
- High strength — 815 MPa (118 ksi), better than 85% of nickel alloy grades
- High service temperature — 1,000°C (1,832 °F), better than 79% of nickel alloy grades
Limitations
- Limited formability — 3/100, worse than 97% of nickel alloy grades
- Difficult to weld — 10/100, worse than 94% of nickel alloy grades
- Difficult to machine — 10/100, worse than 93% of nickel alloy grades
- Poor heat conductor — 9.8 W/m·K (5.66 BTU/hr·ft·°F), worse than 92% of nickel alloy grades
- Limited ductility — 7%, worse than 88% of nickel alloy grades
MAR-M247 properties
Typical room-temperature values for MAR-M247-CC-HT; bars are the position among nickel alloy grades.
Physical3
MAR-M247 has a density of 8.54 g/cm³ (0.309 lb/in³), heavier than 65% of nickel alloy grades. It melts at 1,315°C (2,399 °F).
Mechanical16
MAR-M247 has a yield strength of 815 MPa (118 ksi) and a tensile strength of 965 MPa (140 ksi) — stronger than 85% of nickel alloy grades. Elongation at break is 7% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
MAR-M247 is rated for continuous service to 1,000°C (1,832 °F). It conducts heat at 9.8 W/m·K (5.66 BTU/hr·ft·°F), worse than 92% of nickel alloy grades. Thermal expansion is 11.8 µm/m·K (6.56 µin/in·°F).
Electrical3
MAR-M247 conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is good (68/100), worse than 82% of nickel alloy grades.
Sustainability4
Producing a kilogram of MAR-M247 takes about 230 MJ of energy and emits 14 kg of CO₂ — more than 91% of nickel alloy grades. Typical recycled content is 30%.
Manufacturability8
MAR-M247's machinability is not recommended (10/100, worse than 93% of nickel alloy grades); weldability not recommended (10/100); formability not recommended (3/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the nickel alloy family
Yield strength against density for every nickel alloy grade FabDigit runs. MAR-M247 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with MAR-M247
Is MAR-M247 easy to machine?
Very difficult: rigid setups, low speeds with ceramic/whisker-reinforced or coated carbide tooling, or (more usually) creep-feed grinding, EDM and ECM for cooling holes and root forms.
Can MAR-M247 be welded?
Essentially non-weldable by conventional fusion (Al+Ti > 6 % → strain-age and liquation cracking); repairs use pre-heated/hot-box laser or micro-TIG with ductile filler, activated-diffusion brazing or LC chemistry.
Can MAR-M247 be formed, bent or molded?
Not wrought — parts are produced by vacuum investment casting in equiaxed or directionally solidified shells; Hf addition eases thin-wall DS filling but requires tight shell/mould reaction control.
MAR-M247 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 | 8 – 8.8 | 8.25 |
| Co | 9 – 11 | 10 |
| W | 9.3 – 10.7 | 10 |
| Mo | 0.5 – 0.8 | 0.65 |
| Ta | 2.8 – 3.3 | 3.05 |
| Alγ′ former | 5.3 – 5.7 | 5.5 |
| Tiγ′ former | 0.9 – 1.2 | 1.05 |
| Hfimproves ductility/castability | 1.2 – 1.6 | 1.4 |
| CLC variant ≈0.07 % | 0.13 – 0.17 | 0.15 |
| BLC variant ≈0.015 % max | 0.01 – 0.02 | 0.02 |
| ZrLC variant ≈0.01 % | 0.03 – 0.08 | 0.05 |
| Feimpurity limit | ≤ 0.5 | |
| Siimpurity limit | ≤ 0.15 | |
| Mnimpurity limit | ≤ 0.15 | |
| Simpurity limit | ≤ 0.02 | |
| Nibalance ≈59 % | balance |
What surface finishes work on MAR-M247?
Grit blast plus chemical/vapour aluminide or Pt-Al diffusion coating, MCrAlY overlay and TBC are standard; shot peen and polish blade surfaces; no anodising.
Surface treatments FabDigit runs on nickel alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Nickel Alloy MAR-M247 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N07247
- Trade names
- 5355
- Also called
- Ni-Cr-Co-W-Ta superalloy
How much does MAR-M247 cost?
MAR-M247 is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
MAR-M247 — frequently asked
What is MAR-M247 used for?
MAR-M247 is typically used for turbine blades, turbine vanes and industrial gas turbine hot components. In short: hottest-running cast blade alloy; DS and equiaxed castings; grinding and EDM only.
What is the yield strength of MAR-M247?
MAR-M247 has a typical yield strength of 815 MPa (118 ksi) and a tensile strength of 965 MPa (140 ksi) — stronger than 85% of nickel alloy grades. Strength varies by condition: see the 7 listed tempers.
Is MAR-M247 easy to machine?
Not especially — machinability is rated not recommended (10/100, worse than 93% of nickel alloy grades). Very difficult: rigid setups, low speeds with ceramic/whisker-reinforced or coated carbide tooling, or (more usually) creep-feed grinding, EDM and ECM for cooling holes and root forms.
Can MAR-M247 be welded?
Not readily — weldability is rated not recommended (10/100). Essentially non-weldable by conventional fusion (Al+Ti > 6 % → strain-age and liquation cracking); repairs use pre-heated/hot-box laser or micro-TIG with ductile filler, activated-diffusion brazing or LC chemistry.
What surface finishes work on MAR-M247?
Grit blast plus chemical/vapour aluminide or Pt-Al diffusion coating, MCrAlY overlay and TBC are standard; shot peen and polish blade surfaces; no anodising.
Can MAR-M247 be formed, bent or molded?
Not wrought — parts are produced by vacuum investment casting in equiaxed or directionally solidified shells; Hf addition eases thin-wall DS filling but requires tight shell/mould reaction control.
What is the maximum service temperature of MAR-M247?
MAR-M247 is rated for continuous use to about 1,000°C (1,832 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between MAR-M247 CC-HT and MAR-M247 AM-AB?
CC-HT is the default condition — standard stocked/ordered condition for equiaxed MAR-M247 turbine vanes, blades and integral wheels. AM-AB: only for development/repair hardware — fine dendritic structure gives high hardness but very low ductility and residual microcracking. Yield strength is 815 MPa in CC-HT versus 720 MPa in AM-AB.
How much does MAR-M247 cost?
MAR-M247 is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- AMS 5355 — Nickel Alloy Castings, Investment (corrosion & heat resistant) — SAE International (2018)
- ASM Handbook Vol. 1: Properties and Selection — Superalloys — ASM International (1990)
- Superalloys II / Superalloys: A Technical Guide — Wiley / ASM International (2002)
- Cannon-Muskegon CM247LC alloy data sheet — Cannon-Muskegon (Consolidated Precision Products) (2020)
- Cast nickel superalloy mechanical and thermophysical property compilations — NASA / MMPDS-type sources (2019)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.