Nickel Alloy CW-12MW vs MAR-M247
Nickel Alloy · grade comparison
Nickel Alloy CW-12MW and MAR-M247 are both nickel alloy grades. MAR-M247 is the stronger of the two: yield strength 815 MPa (118 ksi) against 350 MPa (50.8 ksi) for CW-12MW, about 133% more; tensile strength follows at 965 MPa (140 ksi) vs 550 MPa (79.8 ksi). In exchange, CW-12MW is the more ductile: elongation 10% versus 7% for MAR-M247, and MAR-M247 is harder (390 HB vs 200 HB). MAR-M247 is lighter (8.54 g/cm³ vs 8.94 g/cm³ for CW-12MW) and MAR-M247 runs hotter in service (1,000°C vs 650°C continuous). On the shop floor, CW-12MW machines more easily (poor vs not recommended) and CW-12MW welds better (good vs not recommended).
CW-12MWChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
MAR-M247Choose it when strength drives the design, or when weight is the constraint.
CW-12MW vs MAR-M247: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all nickel alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all nickel alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Shear Modulus
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Rockwell C
Compressive Strength
Fracture Toughness (K_IC)
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 205 GPa29.7 Msi
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Liquidus Temperature
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Latent Heat of Fusion 290 J/g125 BTU/lb
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Castability
Polishability
Same in both: Brazeability / Solderability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
Strength versus weight
Yield strength against density for every nickel alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | CW-12MW | MAR-M247 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 3 finishes: Gold Plating, Plasma Spray, Silver Plating.
CW-12MW vs MAR-M247 — frequently asked
Is MAR-M247 stronger than CW-12MW?
Yes. MAR-M247 has a typical yield strength of 815 MPa (118 ksi) against 350 MPa (50.8 ksi) for CW-12MW — about 133% more. Tensile strength is 965 MPa (140 ksi) vs 550 MPa (79.8 ksi).
Which is cheaper, CW-12MW or MAR-M247?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, CW-12MW or MAR-M247?
CW-12MW. Its machinability rates poor (22/100) against not recommended (10/100) for MAR-M247; for welding the order is CW-12MW first (good, 55/100) then MAR-M247 (not recommended, 10/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in CW-12MW and MAR-M247 side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.