Refractory Metal Zr 704 vs Zr 705C
Refractory Metal · grade comparison
Refractory Metal Zr 704 and Zr 705C are both refractory metal grades. Zr 705C is the stronger of the two: yield strength 386 MPa (56 ksi) against 300 MPa (43.5 ksi) for Zr 704, about 29% more; tensile strength follows at 495 MPa (71.8 ksi) vs 470 MPa (68.2 ksi). In exchange, Zr 704 is the more ductile: elongation 22% versus 13% for Zr 705C, and Zr 705C is harder (190 HB vs 180 HB). Zr 705C conducts heat better (17.1 W/m·K vs 14.6 W/m·K). On the shop floor, Zr 704 welds better (very good vs good).
Zr 704Choose it when the part is bent, formed or impact-loaded, or when it will be welded.
Zr 705CChoose it when strength drives the design.
Zr 704 vs Zr 705C: 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.
Elastic (Young's) Modulus
Bulk Modulus
Tensile Strength (Ultimate)
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
Hardness, Rockwell C
Same in both: Shear Modulus 36 GPa5.2 Msi · Poisson's Ratio 0.35
Physical
Density and transition temperatures.
Density
Liquidus Temperature
Same in both: Melting Point (Solidus) 1,840°C3,344 °F
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 Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Castability
Brazeability / Solderability
Polishability
Same in both: Machinability 30 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
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 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 704 | Zr 705C |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Zr 704 vs Zr 705C — frequently asked
Is Zr 705C stronger than Zr 704?
Yes. Zr 705C has a typical yield strength of 386 MPa (56 ksi) against 300 MPa (43.5 ksi) for Zr 704 — about 29% more. Tensile strength is 495 MPa (71.8 ksi) vs 470 MPa (68.2 ksi).
Which is cheaper, Zr 704 or Zr 705C?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which welds better, Zr 704 or Zr 705C?
Zr 704. Its weldability rates very good (80/100) against good (62/100) for Zr 705C.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Zr 704 and Zr 705C 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.