Nickel Alloy Alloy 333 vs Inconel 718
Nickel Alloy · grade comparison
Nickel Alloy Alloy 333 and Inconel 718 are both nickel alloy grades. Inconel 718 is the stronger of the two: yield strength 550 MPa (79.8 ksi) against 310 MPa (45 ksi) for Alloy 333, about 77% more; tensile strength follows at 965 MPa (140 ksi) vs 690 MPa (100 ksi). In exchange, Alloy 333 is the more ductile: elongation 50% versus 45% for Inconel 718, and Inconel 718 is harder (200 HB vs 190 HB). Alloy 333 runs hotter in service (1,100°C vs 540°C continuous). On the shop floor, Inconel 718 sits in a lower cost tier (premium, $$$) than Alloy 333 (high, $$$$).
Alloy 333Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Inconel 718Choose it when strength drives the design, or when cost is the deciding factor.
Alloy 333 vs Inconel 718: 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
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Rockwell C
Hardness, Vickers
Same in both: Shear Modulus 78 GPa11.3 Msi · Reduction in Area 55%
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)
Min Service Temperature
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 333 | Inconel 718 |
|---|---|---|
| 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 333 vs Inconel 718 — frequently asked
Is Inconel 718 stronger than Alloy 333?
Yes. Inconel 718 has a typical yield strength of 550 MPa (79.8 ksi) against 310 MPa (45 ksi) for Alloy 333 — about 77% more. Tensile strength is 965 MPa (140 ksi) vs 690 MPa (100 ksi).
Which is cheaper, Alloy 333 or Inconel 718?
Inconel 718 is the lower-cost material: it sits in the premium tier ($$$) while Alloy 333 is high ($$$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, Alloy 333 or Inconel 718?
Alloy 333, by a small margin. Both rate poor for machinability — 25/100 against 18/100 for Inconel 718; for welding the order is Alloy 333 first (very good, 78/100) then Inconel 718 (very good, 70/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Alloy 333 and Inconel 718 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.