Nickel Alloy Alloy 31 vs Hastelloy X
Nickel Alloy · grade comparison
Nickel Alloy Alloy 31 and Hastelloy X are both nickel alloy grades. Hastelloy X is the stronger of the two: yield strength 360 MPa (52.2 ksi) against 340 MPa (49.3 ksi) for Alloy 31, about 6% more; tensile strength follows at 755 MPa (110 ksi) vs 700 MPa (102 ksi). In exchange, Alloy 31 is the more ductile: elongation 50% versus 43% for Hastelloy X, and Hastelloy X is harder (195 HB vs 180 HB). Hastelloy X runs hotter in service (1,150°C vs 400°C continuous) and Alloy 31 conducts heat better (11 W/m·K vs 9.1 W/m·K). On the shop floor, Hastelloy X welds better (excellent vs very good) and Hastelloy X sits in a lower cost tier (premium, $$$) than Alloy 31 (high, $$$$).
Alloy 31Choose it when the part is bent, formed or impact-loaded.
Hastelloy XChoose it when strength drives the design, or when the part sees heat.
Alloy 31 vs Hastelloy X: 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.
Elastic (Young's) Modulus
Shear Modulus
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Shear Strength
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Compressive Strength
Fracture Toughness (K_IC)
Same in both: Fatigue Strength (Endurance Limit) 300 MPa43.5 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)
Latent Heat of Fusion
Max Service Temperature (continuous)
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).
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
Brazeability / Solderability
Polishability
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 35%
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 | Alloy 31 | Hastelloy X |
|---|---|---|
| CNC machining | — | Yes |
| Sheet metal | — | Yes |
| 3D printing | — | Yes |
| Default condition | — | Solution Annealed |
| Relative cost | $$$$ High | $$$ Premium |
| Min. machined wall | — | 1.5 mm |
| Best machined surface | — | Ra 1.6 µm |
| Electropolishing | — | Yes |
| HVOF Coating | — | Yes |
They share 3 finishes: Gold Plating, Plasma Spray, Silver Plating.
Alloy 31 vs Hastelloy X — frequently asked
Is Hastelloy X stronger than Alloy 31?
Yes. Hastelloy X has a typical yield strength of 360 MPa (52.2 ksi) against 340 MPa (49.3 ksi) for Alloy 31 — about 6% more. Tensile strength is 755 MPa (110 ksi) vs 700 MPa (102 ksi).
Which is cheaper, Alloy 31 or Hastelloy X?
Hastelloy X is the lower-cost material: it sits in the premium tier ($$$) while Alloy 31 is high ($$$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which welds better, Alloy 31 or Hastelloy X?
Hastelloy X. Its weldability rates excellent (85/100) against very good (72/100) for Alloy 31.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Alloy 31 and Hastelloy X 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.