Copper Alloy C84400 vs C95400
Copper Alloy · grade comparison
Copper Alloy C84400 and C95400 are both copper alloy grades. C95400 is the stronger of the two: yield strength 241 MPa (35 ksi) against 110 MPa (16 ksi) for C84400, about 119% more; tensile strength follows at 586 MPa (85 ksi) vs 234 MPa (33.9 ksi). In exchange, C84400 is the more ductile: elongation 26% versus 12% for C95400, and C95400 is harder (170 HB vs 55 HB). C95400 is lighter (7.45 g/cm³ vs 8.8 g/cm³ for C84400) and C95400 is stiffer (110 GPa vs 95 GPa). On the shop floor, C84400 machines more easily (excellent vs fair) and C95400 welds better (good vs poor).
C84400Choose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
C95400Choose it when strength drives the design, or when weight is the constraint.
C84400 vs C95400: 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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Same in both: Charpy V-Notch Impact (RT) 20 J14.8 ft·lbf
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
Max Service Temperature (continuous)
Min Service Temperature
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)
Typical Recycled Content
Same in both: Embodied Water 250 L/kg30 gal/lb
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 | C84400 | C95400 |
|---|---|---|
| Default condition | As Cast | As Cast |
| Relative cost | $$$$$ Specialty | $$$$$ Specialty |
| Min. machined wall | 0.8 mm | 0.8 mm |
| Best machined surface | Ra 1.6 µm | Ra 1.6 µm |
Both are offered for CNC machining. Both take the same 9 finishes: Chrome Plating, Copper Plating, Electroless Nickel (EN), Electropolishing, Gold Plating, Nickel Plating, Painting, Silver Plating, Tin Plating.
C84400 vs C95400 — frequently asked
Is C95400 stronger than C84400?
Yes. C95400 has a typical yield strength of 241 MPa (35 ksi) against 110 MPa (16 ksi) for C84400 — about 119% more. Tensile strength is 586 MPa (85 ksi) vs 234 MPa (33.9 ksi).
Which is cheaper, C84400 or C95400?
Both sit in the same relative cost tier ($$$$$, specialty); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, C84400 or C95400?
C84400. Its machinability rates excellent (90/100) against fair (48/100) for C95400; for welding the order is C95400 first (good, 60/100) then C84400 (poor, 20/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C84400 and C95400 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.