Refractory Metal I-70-H vs S-65
Refractory Metal · grade comparison
Refractory Metal I-70-H and S-65 are both refractory metal grades. S-65 is the stronger of the two: yield strength 230 MPa (33.4 ksi) against 205 MPa (29.7 ksi) for I-70-H, about 12% more; tensile strength follows at 350 MPa (50.8 ksi) vs 310 MPa (45 ksi). S-65 is harder — 145 HV against 130 HV for I-70-H — which matters for wear surfaces and threads. On the shop floor, S-65 machines more easily (45 vs 35 out of 100).
S-65Choose it when strength drives the design, or when surface hardness matters.
I-70-H vs S-65: 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
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
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 303 GPa43.9 Msi · Elongation at Break 4.5%
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.
Min Service Temperature
Same in both: Thermal Conductivity 210 W/m·K121 BTU/hr·ft·°F · 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)
Same in both: Corrosion Resistance 45 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Castability
Polishability
Same in both: Weldability 20 / 100 · Brazeability / Solderability 55 / 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)
Modulus of Resilience
Thermal Shock Resistance Index
Same in both: Specific Stiffness (E / density) 163.8 MN·m/kg · Thermal Diffusivity 59 mm²/s
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 | S-65 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
I-70-H vs S-65 — frequently asked
Is S-65 stronger than I-70-H?
Yes. S-65 has a typical yield strength of 230 MPa (33.4 ksi) against 205 MPa (29.7 ksi) for I-70-H — about 12% more. Tensile strength is 350 MPa (50.8 ksi) vs 310 MPa (45 ksi).
Which is cheaper, I-70-H or S-65?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, I-70-H or S-65?
S-65, by a small margin. Both rate fair for machinability — 45/100 against 35/100 for I-70-H.
Ready to make it?
Upload a CAD file and FabDigit prices the part in I-70-H and S-65 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.