Copper Alloy C71500 vs C90700
Copper Alloy · grade comparison
Copper Alloy C71500 and C90700 are both copper alloy grades. C90700 is the stronger of the two: yield strength 152 MPa (22 ksi) against 140 MPa (20.3 ksi) for C71500, about 9% more. In exchange, C71500 is the more ductile: elongation 45% versus 12% for C90700, and C71500 is harder (45 HRB vs 41 HRB). C71500 is stiffer (152 GPa vs 110 GPa) and C71500 runs hotter in service (350°C vs 250°C continuous). On the shop floor, C90700 machines more easily (fair vs poor) and C71500 welds better (excellent vs poor).
C71500Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C90700Choose it when strength drives the design, or when the part is machined in volume.
C71500 vs C90700: 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
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Rockwell B
Compressive Strength
Same in both: Poisson's Ratio 0.34 · Hardness, Brinell 80 HB · Hardness, Vickers 85 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
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · 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
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 300 L/kg35.9 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 | C71500 | C90700 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 4 finishes: Copper Plating, Electroless Nickel (EN), Gold Plating, Silver Plating.
C71500 vs C90700 — frequently asked
Is C90700 stronger than C71500?
Yes. C90700 has a typical yield strength of 152 MPa (22 ksi) against 140 MPa (20.3 ksi) for C71500 — about 9% more. Tensile strength is 305 MPa (44.2 ksi) vs 380 MPa (55.1 ksi).
Which is cheaper, C71500 or C90700?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, C71500 or C90700?
C90700. Its machinability rates fair (45/100) against poor (30/100) for C71500; for welding the order is C71500 first (excellent, 85/100) then C90700 (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C71500 and C90700 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.