Copper Alloy C44300-H80 vs C44300-O61
Copper Alloy · C44300 temper comparison
C44300-H80 and C44300-O61 are two conditions of the same copper alloy grade, C44300: H80 (hard drawn) versus O61 (annealed). The chemistry is identical, so every difference below comes from the condition. C44300-H80 is the stronger of the two: yield strength 350 MPa (50.8 ksi) against 125 MPa (18.1 ksi) for C44300-O61, about 180% more; tensile strength follows at 480 MPa (69.6 ksi) vs 340 MPa (49.3 ksi). In exchange, C44300-O61 is the more ductile: elongation 65% versus 25% for C44300-H80, and C44300-H80 is harder (130 HB vs 70 HB). C44300-O61 runs hotter in service (200°C vs 175°C continuous).
C44300-H80Choose it when strength drives the design.
C44300-O61Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C44300-H80 vs C44300-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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 110 GPa16 Msi · Shear Modulus 41 GPa5.9 Msi · Bulk Modulus 115 GPa16.7 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 8.53 g/cm³0.31 lb/in³ · Melting Point (Solidus) 900°C1,652 °F · Liquidus Temperature 935°C1,715 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 111 W/m·K64.1 BTU/hr·ft·°F · Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 20.2 µm/m·K11.2 µin/in·°F · Latent Heat of Fusion 170 J/g73.1 BTU/lb · Min Service Temperature -196°C-321 °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) -0.29 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 90 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg · Embodied Water 300 L/kg35.9 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.
C44300-H80 vs C44300-O61 — frequently asked
Is C44300-H80 stronger than C44300-O61?
Yes. C44300-H80 has a typical yield strength of 350 MPa (50.8 ksi) against 125 MPa (18.1 ksi) for C44300-O61 — about 180% more. Tensile strength is 480 MPa (69.6 ksi) vs 340 MPa (49.3 ksi).
Which condition does FabDigit quote by default, H80 or O61?
O61 is the default C44300 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, C44300-H80 or C44300-O61?
C44300-H80. Its machinability rates fair (35/100) against poor (30/100) for C44300-O61; for welding the order is C44300-O61 first (fair, 45/100) then C44300-H80 (fair, 40/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C44300-H80 and C44300-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.