Refractory Metal O-30H vs S-65C
Refractory Metal · grade comparison
Refractory Metal O-30H and S-65C are both refractory metal grades. S-65C is the stronger of the two: yield strength 241 MPa (35 ksi) against 207 MPa (30 ksi) for O-30H, about 16% more. S-65C is the more ductile: elongation 4.5% versus 3% for O-30H, and O-30H is harder (140 HB vs 90 HB).
S-65CChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
O-30H vs S-65C: 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.
Shear Modulus
Bulk Modulus
Poisson's Ratio
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 303 GPa43.9 Msi · Tensile Strength (Ultimate) 324 MPa47 ksi · Compressive Strength 480 MPa69.6 ksi · Fracture Toughness (K_IC) 11 MPa·√m10 ksi·√in
Physical
Density and transition temperatures.
Liquidus Temperature
Same in both: Density 1.85 g/cm³0.07 lb/in³ · Melting Point (Solidus) 1,287°C2,349 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Same in both: 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 · Min Service Temperature -269°C-452 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 42 % IACS · Electrical Resistivity 4.1×10⁻⁸ Ω·m1.61 µΩ·in
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 %)
Formability (cold)
Brazeability / Solderability
Polishability
Same in both: Weldability 15 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Water
Typical Recycled Content
Same in both: Embodied Energy (primary production) 1,500 MJ/kg644,885 BTU/lb · Embodied Carbon (primary production) 95 kg CO₂/kg
Common Calculations
Ratios derived from the values above.
Modulus of Resilience
Thermal Diffusivity
Same in both: Specific Strength (UTS / density) 175 kN·m/kg · Specific Stiffness (E / density) 163.8 MN·m/kg · Thermal Shock Resistance Index 20
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 | O-30H | S-65C |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
O-30H vs S-65C — frequently asked
Is S-65C stronger than O-30H?
Yes. S-65C has a typical yield strength of 241 MPa (35 ksi) against 207 MPa (30 ksi) for O-30H — about 16% more. Tensile strength is 324 MPa (47 ksi) vs 324 MPa (47 ksi).
Which is cheaper, O-30H or S-65C?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, O-30H or S-65C?
S-65C, by a small margin. Both rate fair for machinability — 40/100 against 35/100 for O-30H.
Ready to make it?
Upload a CAD file and FabDigit prices the part in O-30H and S-65C 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.