Refractory Metal I-220H vs S-65C
Refractory Metal · grade comparison
Refractory Metal I-220H and S-65C are both refractory metal grades. I-220H is the stronger of the two: yield strength 345 MPa (50 ksi) against 241 MPa (35 ksi) for S-65C, about 43% more; tensile strength follows at 462 MPa (67 ksi) vs 324 MPa (47 ksi). In exchange, S-65C is the more ductile: elongation 4.5% versus 2% for I-220H, and I-220H is harder (180 HB vs 90 HB). On the shop floor, S-65C machines more easily (fair vs poor).
I-220HChoose it when strength drives the design.
S-65CChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
I-220H 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
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: Elastic (Young's) Modulus 303 GPa43.9 Msi · Bulk Modulus 117 GPa17 Msi · Poisson's Ratio 0.07
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
Min Service Temperature
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
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
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Brazeability / Solderability
Polishability
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 15%
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-220H | S-65C |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
I-220H vs S-65C — frequently asked
Is I-220H stronger than S-65C?
Yes. I-220H has a typical yield strength of 345 MPa (50 ksi) against 241 MPa (35 ksi) for S-65C — about 43% more. Tensile strength is 462 MPa (67 ksi) vs 324 MPa (47 ksi).
Which is cheaper, I-220H or S-65C?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, I-220H or S-65C?
S-65C. Its machinability rates fair (40/100) against poor (25/100) for I-220H; for welding the order is I-220H first (poor, 20/100) then S-65C (poor, 15/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in I-220H 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.