Tungsten Alloy W-25Re vs W70Cu30
Tungsten Alloy · grade comparison
Tungsten Alloy W-25Re and W70Cu30 are both tungsten alloy grades. W-25Re is the stronger of the two: yield strength 1,850 MPa (268 ksi) against 450 MPa (65.3 ksi) for W70Cu30, about 4.1 times as much; tensile strength follows at 2,100 MPa (305 ksi) vs 620 MPa (89.9 ksi). In exchange, W70Cu30 is the more ductile: elongation 5% versus 4% for W-25Re, and W-25Re is harder (620 HV vs 200 HV). W70Cu30 is lighter (14 g/cm³ vs 19.7 g/cm³ for W-25Re) and W-25Re is stiffer (400 GPa vs 230 GPa). On the shop floor, W70Cu30 machines more easily (fair vs not recommended) and W-25Re welds better (fair vs poor).
W-25ReChoose it when strength drives the design, or when the part sees heat.
W70Cu30Choose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
W-25Re vs W70Cu30: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all tungsten 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 tungsten 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
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Vickers
Compressive Strength
Shear Strength
Hardness, Brinell
Hardness, Rockwell B
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).
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
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
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 25%
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 tungsten alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | W-25Re | W70Cu30 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
W-25Re vs W70Cu30 — frequently asked
Is W-25Re stronger than W70Cu30?
Yes. W-25Re has a typical yield strength of 1,850 MPa (268 ksi) against 450 MPa (65.3 ksi) for W70Cu30 — about 4.1 times as much. Tensile strength is 2,100 MPa (305 ksi) vs 620 MPa (89.9 ksi).
Which is cheaper, W-25Re or W70Cu30?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, W-25Re or W70Cu30?
W70Cu30. Its machinability rates fair (35/100) against not recommended (8/100) for W-25Re; for welding the order is W-25Re first (fair, 45/100) then W70Cu30 (poor, 15/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in W-25Re and W70Cu30 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.