Copper Alloy C28000 vs C46400
Copper Alloy · grade comparison
Copper Alloy C28000 and C46400 are both copper alloy grades, both marine cu alloy. C46400 is the stronger of the two: yield strength 172 MPa (24.9 ksi) against 145 MPa (21 ksi) for C28000, about 19% more. C46400 is harder — 95 HB against 75 HB for C28000 — which matters for wear surfaces and threads. On the shop floor, C28000 machines more easily (good vs fair) and C28000 sits in a lower cost tier (premium, $$$) than C46400 (high, $$$$).
C28000Choose it when the part is machined in volume, or when cost is the deciding factor.
C46400Choose it when strength drives the design, or when surface hardness matters.
C28000 vs C46400: 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
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Hardness, Brinell
Hardness, Rockwell B
Reduction in Area
Charpy V-Notch Impact (RT)
Hardness, Vickers
Same in both: Poisson's Ratio 0.34 · Fatigue Strength (Endurance Limit) 138 MPa20 ksi
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
Same in both: Polishability 75 / 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
Same in both: Thermal Shock Resistance Index 21
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 | C28000 | C46400 |
|---|---|---|
| Default condition | O | O |
| Relative cost | $$$ Premium | $$$$ High |
| Min. machined wall | 0.8 mm | 0.8 mm |
| Best machined surface | Ra 1.6 µm | Ra 0.8 µm |
Both are offered for CNC machining and Sheet metal. Both take the same 9 finishes: Chrome Plating, Copper Plating, Electroless Nickel (EN), Electropolishing, Gold Plating, Nickel Plating, Painting, Silver Plating, Tin Plating.
C28000 vs C46400 — frequently asked
Is C46400 stronger than C28000?
Yes. C46400 has a typical yield strength of 172 MPa (24.9 ksi) against 145 MPa (21 ksi) for C28000 — about 19% more. Tensile strength is 380 MPa (55.1 ksi) vs 372 MPa (54 ksi).
Which is cheaper, C28000 or C46400?
C28000 is the lower-cost material: it sits in the premium tier ($$$) while C46400 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, C28000 or C46400?
C28000. Its machinability rates good (55/100) against fair (35/100) for C46400; for welding the order is C28000 first (fair, 50/100) then C46400 (fair, 45/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C28000 and C46400 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.