Copper Alloy C70400-H80 vs C70400-O61
Copper Alloy · C70400 temper comparison
C70400-H80 and C70400-O61 are two conditions of the same copper alloy grade, C70400: H80 (hard drawn) versus O61 (annealed). The chemistry is identical, so every difference below comes from the condition. C70400-H80 is the stronger of the two: yield strength 345 MPa (50 ksi) against 105 MPa (15.2 ksi) for C70400-O61, about 3.3 times as much; tensile strength follows at 380 MPa (55.1 ksi) vs 275 MPa (39.9 ksi). In exchange, C70400-O61 is the more ductile: elongation 46% versus 12% for C70400-H80, and C70400-H80 is harder (120 HB vs 70 HB). C70400-O61 runs hotter in service (300°C vs 200°C continuous). On the shop floor, C70400-H80 machines more easily (fair vs poor).
C70400-H80Choose it when strength drives the design, or when the part is machined in volume.
C70400-O61Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C70400-H80 vs C70400-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.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Same in both: Elastic (Young's) Modulus 138 GPa20 Msi · Shear Modulus 52 GPa7.5 Msi · Bulk Modulus 135 GPa19.6 Msi · Poisson's Ratio 0.33 · Reduction in Area 65%
Physical
Density and transition temperatures.
Same in both: Density 8.94 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,099°C2,010 °F · Liquidus Temperature 1,149°C2,100 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 65 W/m·K37.6 BTU/hr·ft·°F · Specific Heat Capacity 376 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 16.3 µm/m·K9.1 µin/in·°F · Latent Heat of Fusion 200 J/g86 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 13 % IACS · Electrical Resistivity 1.33×10⁻⁷ Ω·m5.24 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.26 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 80 / 100 · Castability 40 / 100 · Brazeability / Solderability 90 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 65 MJ/kg27,945 BTU/lb · Embodied Carbon (primary production) 4.6 kg CO₂/kg · Embodied Water 250 L/kg30 gal/lb · Typical Recycled Content 30%
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.
C70400-H80 vs C70400-O61 — frequently asked
Is C70400-H80 stronger than C70400-O61?
Yes. C70400-H80 has a typical yield strength of 345 MPa (50 ksi) against 105 MPa (15.2 ksi) for C70400-O61 — about 3.3 times as much. Tensile strength is 380 MPa (55.1 ksi) vs 275 MPa (39.9 ksi).
Which condition does FabDigit quote by default, H80 or O61?
O61 is the default C70400 condition in the FabDigit quote flow. 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, C70400-H80 or C70400-O61?
C70400-H80. Its machinability rates fair (35/100) against poor (22/100) for C70400-O61.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C70400-H80 and C70400-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.