Refractory Metal Zr 704C vs Zr 706
Refractory Metal · grade comparison
Refractory Metal Zr 704C and Zr 706 are both refractory metal grades. Zr 706 is the stronger of the two: yield strength 400 MPa (58 ksi) against 300 MPa (43.5 ksi) for Zr 704C, about 33% more; tensile strength follows at 550 MPa (79.8 ksi) vs 450 MPa (65.3 ksi). Zr 706 is the more ductile: elongation 24% versus 13% for Zr 704C, and Zr 704C is harder (190 HB vs 180 HB). Zr 706 conducts heat better (17.1 W/m·K vs 13 W/m·K). On the shop floor, Zr 706 machines more easily (fair vs poor) and Zr 706 welds better (very good vs good).
Zr 706Choose it when strength drives the design, or when the part is bent, formed or impact-loaded.
Zr 704C vs Zr 706: 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
Poisson's Ratio
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
Same in both: Shear Modulus 36 GPa5.2 Msi
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
Min Service Temperature
Same in both: Thermal Expansion (CTE, 20–100 °C) 6 µm/m·K3.3 µin/in·°F · Latent Heat of Fusion 155 J/g66.6 BTU/lb · Max Service Temperature (continuous) 400°C752 °F
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)
Castability
Polishability
Same in both: Brazeability / Solderability 20 / 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 704C | Zr 706 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Zr 704C vs Zr 706 — frequently asked
Is Zr 706 stronger than Zr 704C?
Yes. Zr 706 has a typical yield strength of 400 MPa (58 ksi) against 300 MPa (43.5 ksi) for Zr 704C — about 33% more. Tensile strength is 550 MPa (79.8 ksi) vs 450 MPa (65.3 ksi).
Which is cheaper, Zr 704C or Zr 706?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, Zr 704C or Zr 706?
Zr 706. Its machinability rates fair (40/100) against poor (30/100) for Zr 704C; for welding the order is Zr 706 first (very good, 75/100) then Zr 704C (good, 65/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Zr 704C and Zr 706 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.