Copper Alloy C44400-H04 vs C44400-O61
Copper Alloy · C44400 temper comparison
C44400-H04 and C44400-O61 are two conditions of the same copper alloy grade, C44400: H04 (full hard) versus O61 (annealed). The chemistry is identical, so every difference below comes from the condition. C44400-H04 is the stronger of the two: yield strength 400 MPa (58 ksi) against 140 MPa (20.3 ksi) for C44400-O61, about 186% more; tensile strength follows at 517 MPa (75 ksi) vs 355 MPa (51.5 ksi). In exchange, C44400-O61 is the more ductile: elongation 65% versus 15% for C44400-H04, and C44400-H04 is harder (135 HB vs 65 HB). C44400-O61 runs hotter in service (200°C vs 150°C continuous).
C44400-H04Choose it when strength drives the design.
C44400-O61Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C44400-H04 vs C44400-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
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 110 GPa16 Msi · Shear Modulus 41 GPa5.9 Msi · Bulk Modulus 112 GPa16.2 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.
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) 20.2 µm/m·K11.2 µin/in·°F · Latent Heat of Fusion 170 J/g73.1 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) -0.28 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: Brazeability / Solderability 90 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 62 MJ/kg26,655 BTU/lb · Embodied Carbon (primary production) 4 kg CO₂/kg · Embodied Water 300 L/kg35.9 gal/lb · Typical Recycled Content 40%
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.
C44400-H04 vs C44400-O61 — frequently asked
Is C44400-H04 stronger than C44400-O61?
Yes. C44400-H04 has a typical yield strength of 400 MPa (58 ksi) against 140 MPa (20.3 ksi) for C44400-O61 — about 186% more. Tensile strength is 517 MPa (75 ksi) vs 355 MPa (51.5 ksi).
Which condition does FabDigit quote by default, H04 or O61?
O61 is the default C44400 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 welds better, C44400-H04 or C44400-O61?
C44400-O61. Its weldability rates fair (45/100) against fair (40/100) for C44400-H04.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C44400-H04 and C44400-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.