Copper Alloy C33000 vs C38500
Copper Alloy · grade comparison
Copper Alloy C33000 and C38500 are both copper alloy grades. C38500 is the stronger of the two: yield strength 170 MPa (24.7 ksi) against 110 MPa (16 ksi) for C33000, about 55% more; tensile strength follows at 415 MPa (60.2 ksi) vs 340 MPa (49.3 ksi). In exchange, C33000 is the more ductile: elongation 55% versus 30% for C38500, and C38500 is harder (100 HB vs 55 HB). C33000 is stiffer (103 GPa vs 97 GPa). On the shop floor, C38500 machines more easily (excellent vs very good).
C33000Choose it when the part is bent, formed or impact-loaded.
C38500Choose it when strength drives the design, or when the part is machined in volume.
C33000 vs C38500: 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, Brinell
Hardness, Vickers
Hardness, Rockwell B
Same in both: Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Melting Point (Solidus)
Liquidus Temperature
Same in both: Density 8.47 g/cm³0.31 lb/in³
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
Same in both: Max Service Temperature (continuous) 200°C392 °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).
Same in both: Galvanic Potential (seawater, vs SCE) -0.25 V · Corrosion Resistance 55 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Polishability
Castability
Same in both: Brazeability / Solderability 85 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Water
Typical Recycled Content
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg
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 | C33000 | C38500 |
|---|---|---|
| Sheet metal | Yes | — |
| Default condition | O | As Extruded |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | 0.8 mm | 0.8 mm |
| Best machined surface | Ra 1.6 µm | Ra 1.6 µm |
Both are offered for CNC machining. Both take the same 9 finishes: Chrome Plating, Copper Plating, Electroless Nickel (EN), Electropolishing, Gold Plating, Nickel Plating, Painting, Silver Plating, Tin Plating.
C33000 vs C38500 — frequently asked
Is C38500 stronger than C33000?
Yes. C38500 has a typical yield strength of 170 MPa (24.7 ksi) against 110 MPa (16 ksi) for C33000 — about 55% more. Tensile strength is 415 MPa (60.2 ksi) vs 340 MPa (49.3 ksi).
Which is cheaper, C33000 or C38500?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, C33000 or C38500?
C38500. Its machinability rates excellent (90/100) against very good (70/100) for C33000; for welding the order is C33000 first (poor, 25/100) then C38500 (poor, 20/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C33000 and C38500 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.