Copper Alloy C83400 vs C85900
Copper Alloy · grade comparison
Copper Alloy C83400 and C85900 are both copper alloy grades. C85900 is the stronger of the two: yield strength 115 MPa (16.7 ksi) against 69 MPa (10 ksi) for C83400, about 67% more; tensile strength follows at 290 MPa (42.1 ksi) vs 234 MPa (33.9 ksi). In exchange, C83400 is the more ductile: elongation 35% versus 25% for C85900, and C85900 is harder (60 HB vs 50 HB). C85900 is lighter (8.4 g/cm³ vs 8.8 g/cm³ for C83400) and C83400 conducts heat better (159 W/m·K vs 85 W/m·K). On the shop floor, C85900 machines more easily (very good vs good), C83400 welds better (fair vs poor), and C85900 sits in a lower cost tier (premium, $$$) than C83400 (high, $$$$).
C83400Choose it when the part is bent, formed or impact-loaded, or when it will be welded.
C85900Choose it when strength drives the design, or when weight is the constraint.
C83400 vs C85900: 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
Bulk Modulus
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, Vickers
Same in both: Shear Modulus 37 GPa5.4 Msi · Poisson's Ratio 0.34
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).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.25 V
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
Same in both: Polishability 70 / 100
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 | C85900 |
|---|---|---|
| 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 C85900 — frequently asked
Is C85900 stronger than C83400?
Yes. C85900 has a typical yield strength of 115 MPa (16.7 ksi) against 69 MPa (10 ksi) for C83400 — about 67% more. Tensile strength is 290 MPa (42.1 ksi) vs 234 MPa (33.9 ksi).
Which is cheaper, C83400 or C85900?
C85900 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 C85900?
C85900. Its machinability rates very good (80/100) against good (58/100) for C83400; for welding the order is C83400 first (fair, 45/100) then C85900 (poor, 30/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C83400 and C85900 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.