Copper Alloy C73500-H10 vs C73500-O61
Copper Alloy · C73500 temper comparison
C73500-H10 and C73500-O61 are two conditions of the same copper alloy grade, C73500: H10 (extra spring hard) versus O61 (annealed). The chemistry is identical, so every difference below comes from the condition. C73500-H10 is the stronger of the two: yield strength 660 MPa (95.7 ksi) against 145 MPa (21 ksi) for C73500-O61, about 4.6 times as much; tensile strength follows at 725 MPa (105 ksi) vs 385 MPa (55.8 ksi). In exchange, C73500-O61 is the more ductile: elongation 40% versus 1.5% for C73500-H10, and C73500-H10 is harder (205 HB vs 78 HB). C73500-O61 runs hotter in service (250°C vs 150°C continuous). On the shop floor, C73500-H10 machines more easily (fair vs poor) and C73500-O61 welds better (good vs fair).
C73500-H10Choose it when strength drives the design, or when the part is machined in volume.
C73500-O61Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C73500-H10 vs C73500-O61: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all copper alloy 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 copper alloy 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
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Shear Modulus 47 GPa6.8 Msi · Bulk Modulus 128 GPa18.6 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 8.86 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,080°C1,976 °F · Liquidus Temperature 1,110°C2,030 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 16.2 µm/m·K9 µin/in·°F · Latent Heat of Fusion 210 J/g90.3 BTU/lb · Min Service Temperature -200°C-328 °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) -0.25 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Castability 40 / 100 · Brazeability / Solderability 85 / 100 · Polishability 90 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 78 MJ/kg33,534 BTU/lb · Embodied Carbon (primary production) 5.6 kg CO₂/kg · Embodied Water 250 L/kg30 gal/lb · Typical Recycled Content 35%
Strength versus weight
Yield strength against density for every copper alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
C73500-H10 vs C73500-O61 — frequently asked
Is C73500-H10 stronger than C73500-O61?
Yes. C73500-H10 has a typical yield strength of 660 MPa (95.7 ksi) against 145 MPa (21 ksi) for C73500-O61 — about 4.6 times as much. Tensile strength is 725 MPa (105 ksi) vs 385 MPa (55.8 ksi).
Which condition does FabDigit quote by default, H10 or O61?
H02 is the default C73500 condition in the FabDigit quote flow (neither H10 nor O61). The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, C73500-H10 or C73500-O61?
C73500-H10. Its machinability rates fair (35/100) against poor (25/100) for C73500-O61; for welding the order is C73500-O61 first (good, 55/100) then C73500-H10 (fair, 45/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C73500-H10 and C73500-O61 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.