Refractory Metal Zr 702 vs Zr 704C
Refractory Metal · grade comparison
Refractory Metal Zr 702 and Zr 704C are both refractory metal grades. Both yield at about 290 MPa — strength does not separate them. Zr 702 is the more ductile: elongation 30% versus 13% for Zr 704C, and Zr 704C is harder (190 HB vs 150 HB). Zr 702 conducts heat better (22 W/m·K vs 13 W/m·K). On the shop floor, Zr 702 welds better (very good vs good).
Zr 702Choose it when the part is bent, formed or impact-loaded, or when it will be welded.
Zr 702 vs Zr 704C: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all refractory metal 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 refractory metal 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
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
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 99 GPa14.4 Msi · Shear Modulus 36 GPa5.2 Msi · Tensile Strength (Ultimate) 450 MPa65.3 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
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Specific Heat Capacity 285 J/kg·K0.07 BTU/lb·°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)
Typical Recycled Content
Same in both: Embodied Water 900 L/kg108 gal/lb
Common Calculations
Ratios derived from the values above.
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
Same in both: Specific Strength (UTS / density) 69 kN·m/kg
Strength versus weight
Yield strength against density for every refractory metal grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | Zr 702 | Zr 704C |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Zr 702 vs Zr 704C — frequently asked
What is the difference between Zr 702 and Zr 704C?
Refractory Metal Zr 702 and Zr 704C are both refractory metal grades. Both yield at about 290 MPa — strength does not separate them. Zr 702 is the more ductile: elongation 30% versus 13% for Zr 704C, and Zr 704C is harder (190 HB vs 150 HB).
Which is cheaper, Zr 702 or Zr 704C?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, Zr 702 or Zr 704C?
Zr 702. Its machinability rates fair (35/100) against poor (30/100) for Zr 704C; for welding the order is Zr 702 first (very good, 80/100) then Zr 704C (good, 65/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Zr 702 and Zr 704C 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.