Nickel Alloy Inconel 601 vs Nimonic 75
Nickel Alloy · grade comparison
Nickel Alloy Inconel 601 and Nimonic 75 are both nickel alloy grades. Nimonic 75 is the stronger of the two: tensile strength 750 MPa (109 ksi) against 690 MPa (100 ksi) for Inconel 601, about 9% more. In exchange, Inconel 601 is the more ductile: elongation 45% versus 40% for Nimonic 75, and Nimonic 75 is harder (180 HB vs 150 HB). Inconel 601 is lighter (8.11 g/cm³ vs 8.37 g/cm³ for Nimonic 75) and Inconel 601 runs hotter in service (1,150°C vs 950°C continuous).
Inconel 601Choose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
Nimonic 75Choose it when strength drives the design.
Inconel 601 vs Nimonic 75: 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.
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 206 GPa29.9 Msi · Shear Modulus 79 GPa11.5 Msi · Shear Strength 470 MPa68.2 ksi
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)
Latent Heat of Fusion
Same in both: Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.15 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Castability
Brazeability / Solderability
Same in both: Machinability 28 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 40%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Same in both: Thermal Shock Resistance Index 3
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 | Inconel 601 | Nimonic 75 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 3 finishes: Gold Plating, Plasma Spray, Silver Plating.
Inconel 601 vs Nimonic 75 — frequently asked
Is Nimonic 75 stronger than Inconel 601?
Yes. Nimonic 75 has a typical tensile strength of 750 MPa (109 ksi) against 690 MPa (100 ksi) for Inconel 601 — about 9% more.
Which is cheaper, Inconel 601 or Nimonic 75?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
When should I choose Inconel 601 over Nimonic 75?
Pick Inconel 601 when the part is bent, formed or impact-loaded, or when weight is the constraint. Pick Nimonic 75 when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Inconel 601 and Nimonic 75 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.