Copper Alloy C51900 vs C62581
Copper Alloy · grade comparison
Copper Alloy C51900 and C62581 are both copper alloy grades. C62581 is the stronger of the two: yield strength 483 MPa (70.1 ksi) against 450 MPa (65.3 ksi) for C51900, about 7% more; tensile strength follows at 793 MPa (115 ksi) vs 520 MPa (75.4 ksi). In exchange, C51900 is the more ductile: elongation 20% versus 3% for C62581, and C62581 is harder (262 HB vs 155 HB). C62581 is lighter (7.3 g/cm³ vs 8.8 g/cm³ for C51900) and C62581 runs hotter in service (300°C vs 200°C continuous). On the shop floor, C51900 welds better (fair vs poor) and C62581 sits in a lower cost tier (high, $$$$) than C51900 (specialty, $$$$$).
C51900Choose it when the part is bent, formed or impact-loaded, or when it will be welded.
C62581Choose it when strength drives the design, or when weight is the constraint.
C51900 vs C62581: 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.
Shear Modulus
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Charpy V-Notch Impact (RT)
Hardness, Rockwell C
Same in both: Elastic (Young's) Modulus 115 GPa16.7 Msi
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)
Same in both: Min Service Temperature -200°C-328 °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
Weldability
Formability (cold)
Brazeability / Solderability
Polishability
Castability
Same in both: Machinability Rating (AISI 1212 = 100 %) 20%
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 | C51900 | C62581 |
|---|---|---|
| CNC machining | Yes | — |
| Sheet metal | Yes | — |
| Default condition | — | — |
| Relative cost | $$$$$ Specialty | $$$$ High |
| Min. machined wall | 0.8 mm | — |
| Best machined surface | Ra 1.6 µm | — |
| Chrome Plating | Yes | — |
| Electropolishing | Yes | — |
| Nickel Plating | Yes | — |
| Painting | Yes | — |
| Tin Plating | Yes | — |
They share 4 finishes: Copper Plating, Electroless Nickel (EN), Gold Plating, Silver Plating.
C51900 vs C62581 — frequently asked
Is C62581 stronger than C51900?
Yes. C62581 has a typical yield strength of 483 MPa (70.1 ksi) against 450 MPa (65.3 ksi) for C51900 — about 7% more. Tensile strength is 793 MPa (115 ksi) vs 520 MPa (75.4 ksi).
Which is cheaper, C51900 or C62581?
C62581 is the lower-cost material: it sits in the high tier ($$$$) while C51900 is specialty ($$$$$). 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, C51900 or C62581?
C62581, by a small margin. Both rate poor for machinability — 30/100 against 25/100 for C51900; for welding the order is C51900 first (fair, 45/100) then C62581 (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C51900 and C62581 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.