Copper Alloy C74500 vs C76400
Copper Alloy · grade comparison
Copper Alloy C74500 and C76400 are both copper alloy grades. C76400 is the stronger of the two: yield strength 510 MPa (74 ksi) against 400 MPa (58 ksi) for C74500, about 28% more; tensile strength follows at 585 MPa (84.8 ksi) vs 510 MPa (74 ksi). In exchange, C74500 is the more ductile: elongation 12% versus 4% for C76400, and C76400 is harder (165 HB vs 150 HB). C76400 runs hotter in service (200°C vs 180°C continuous) and C74500 conducts heat better (45 W/m·K vs 29 W/m·K). On the shop floor, C76400 welds better (good vs fair).
C74500Choose it when the part is bent, formed or impact-loaded.
C76400Choose it when strength drives the design, or when the part sees heat.
C74500 vs C76400: 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
Shear Modulus
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Liquidus Temperature
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Latent Heat of Fusion
Max Service Temperature (continuous)
Min Service Temperature
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
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 Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Brazeability / Solderability
Polishability
Castability
Same in both: Machinability 30 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Carbon (primary production)
Embodied Water
Same in both: Embodied Energy (primary production) 78 MJ/kg33,534 BTU/lb · Typical Recycled Content 40%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
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.
Manufacturing and finishing
| Capability | C74500 | C76400 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 4 finishes: Copper Plating, Electroless Nickel (EN), Gold Plating, Silver Plating.
C74500 vs C76400 — frequently asked
Is C76400 stronger than C74500?
Yes. C76400 has a typical yield strength of 510 MPa (74 ksi) against 400 MPa (58 ksi) for C74500 — about 28% more. Tensile strength is 585 MPa (84.8 ksi) vs 510 MPa (74 ksi).
Which is cheaper, C74500 or C76400?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which welds better, C74500 or C76400?
C76400. Its weldability rates good (55/100) against fair (40/100) for C74500.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C74500 and C76400 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.