Copper Alloy C83400 vs C85400
Copper Alloy · grade comparison
Copper Alloy C83400 and C85400 are both copper alloy grades. C85400 is the stronger of the two: yield strength 83 MPa (12 ksi) against 69 MPa (10 ksi) for C83400, about 20% more. C85400 is lighter (8.47 g/cm³ vs 8.8 g/cm³ for C83400) and C83400 conducts heat better (159 W/m·K vs 87 W/m·K). On the shop floor, C85400 machines more easily (excellent vs good), C83400 welds better (fair vs poor), and C83400 forms better (30 vs 15 out of 100).
C83400Choose it when it will be welded.
C85400Choose it when strength drives the design, or when weight is the constraint.
C83400 vs C85400: 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
Yield Strength (0.2% offset)
Reduction in Area
Shear Strength
Charpy V-Notch Impact (RT)
Compressive Strength
Hardness, Rockwell B
Same in both: Shear Modulus 37 GPa5.4 Msi · Bulk Modulus 105 GPa15.2 Msi · Poisson's Ratio 0.34 · Tensile Strength (Ultimate) 234 MPa33.9 ksi · Elongation at Break 35% · Fatigue Strength (Endurance Limit) 70 MPa10.2 ksi · Hardness, Brinell 50 HB · Hardness, Vickers 53 HV
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
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
Min Service Temperature
Same in both: Max Service Temperature (continuous) 200°C392 °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
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Castability
Brazeability / Solderability
Polishability
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
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 | C83400 | C85400 |
|---|---|---|
| CNC machining | Yes | — |
| Default condition | As Cast | — |
| Relative cost | $$$$ High | $$$ Premium |
| Min. machined wall | 0.8 mm | — |
| Best machined surface | Ra 1.6 µm | — |
| Chrome Plating | Yes | — |
| Electropolishing | Yes | — |
| Nickel Plating | Yes | — |
| Painting | Yes | — |
| Tin Plating | Yes | — |
They share 4 finishes: Copper Plating, Electroless Nickel (EN), Gold Plating, Silver Plating.
C83400 vs C85400 — frequently asked
Is C85400 stronger than C83400?
Yes. C85400 has a typical yield strength of 83 MPa (12 ksi) against 69 MPa (10 ksi) for C83400 — about 20% more. Tensile strength is 234 MPa (33.9 ksi) vs 234 MPa (33.9 ksi).
Which is cheaper, C83400 or C85400?
C85400 is the lower-cost material: it sits in the premium tier ($$$) while C83400 is high ($$$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, C83400 or C85400?
C85400. Its machinability rates excellent (85/100) against good (58/100) for C83400; for welding the order is C83400 first (fair, 45/100) then C85400 (poor, 20/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C83400 and C85400 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.