Refractory Metal I-70-H vs O-30H
Refractory Metal · grade comparison
Refractory Metal I-70-H and O-30H are both refractory metal grades. Both yield at about 205 MPa — strength does not separate them. I-70-H is the more ductile: elongation 4.5% versus 3% for O-30H, and O-30H is harder (140 HB vs 120 HB).
I-70-HChoose it when the part is bent, formed or impact-loaded.
I-70-H vs O-30H: 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.
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)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 303 GPa43.9 Msi · Shear Modulus 145 GPa21 Msi · Bulk Modulus 116 GPa16.8 Msi · Poisson's Ratio 0.08 · Charpy V-Notch Impact (RT) 2 J1.1 ft·lbf
Physical
Density and transition temperatures.
Same in both: Density 1.85 g/cm³0.07 lb/in³ · Melting Point (Solidus) 1,287°C2,349 °F · Liquidus Temperature 1,289°C2,352 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Min Service Temperature
Same in both: Specific Heat Capacity 1,925 J/kg·K0.46 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.3 µm/m·K6.3 µin/in·°F · Latent Heat of Fusion 1,355 J/g583 BTU/lb · Max Service Temperature (continuous) 500°C932 °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 Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Castability
Polishability
Same in both: Machinability 35 / 100 · Brazeability / Solderability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 10%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
Same in both: Specific Stiffness (E / density) 163.8 MN·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 | I-70-H | O-30H |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
I-70-H vs O-30H — frequently asked
What is the difference between I-70-H and O-30H?
Refractory Metal I-70-H and O-30H are both refractory metal grades. Both yield at about 205 MPa — strength does not separate them. I-70-H is the more ductile: elongation 4.5% versus 3% for O-30H, and O-30H is harder (140 HB vs 120 HB).
Which is cheaper, I-70-H or O-30H?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which welds better, I-70-H or O-30H?
I-70-H. Its weldability rates poor (20/100) against poor (15/100) for O-30H.
Ready to make it?
Upload a CAD file and FabDigit prices the part in I-70-H and O-30H 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.