Copper Alloy C71580-M20 vs C71580-O61
Copper Alloy · C71580 temper comparison
C71580-M20 and C71580-O61 are two conditions of the same copper alloy grade, C71580: M20 (as hot rolled) versus O61 (annealed). The chemistry is identical, so every difference below comes from the condition. C71580-M20 is the stronger of the two: yield strength 170 MPa (24.7 ksi) against 150 MPa (21.8 ksi) for C71580-O61, about 13% more; tensile strength follows at 400 MPa (58 ksi) vs 380 MPa (55.1 ksi). C71580-M20 is harder — 85 HB against 80 HB for C71580-O61 — which matters for wear surfaces and threads.
C71580-M20Choose it when strength drives the design, or when surface hardness matters.
C71580-M20 vs C71580-O61: 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.
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, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 152 GPa22 Msi · Shear Modulus 57 GPa8.3 Msi · Bulk Modulus 140 GPa20.3 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 8.94 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,170°C2,138 °F · Liquidus Temperature 1,240°C2,264 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 29 W/m·K16.8 BTU/hr·ft·°F · Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 16.2 µm/m·K9 µin/in·°F · Latent Heat of Fusion 220 J/g94.6 BTU/lb · Max Service Temperature (continuous) 350°C662 °F · Min Service Temperature -198°C-324 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 4.6 % IACS · Electrical Resistivity 3.75×10⁻⁷ Ω·m14.8 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.26 V · Corrosion Resistance 82 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Formability (cold)
Same in both: Machinability 28 / 100 · Machinability Rating (AISI 1212 = 100 %) 20% · Weldability 88 / 100 · Castability 58 / 100 · Brazeability / Solderability 78 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 88 MJ/kg37,833 BTU/lb · Embodied Carbon (primary production) 6.5 kg CO₂/kg · Embodied Water 300 L/kg35.9 gal/lb · Typical Recycled Content 30%
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.
C71580-M20 vs C71580-O61 — frequently asked
Is C71580-M20 stronger than C71580-O61?
Yes. C71580-M20 has a typical yield strength of 170 MPa (24.7 ksi) against 150 MPa (21.8 ksi) for C71580-O61 — about 13% more. Tensile strength is 400 MPa (58 ksi) vs 380 MPa (55.1 ksi).
Which condition does FabDigit quote by default, M20 or O61?
O61 is the default C71580 condition in the FabDigit quote flow. The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
When should I choose C71580-M20 over C71580-O61?
Pick C71580-M20 when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C71580-M20 and C71580-O61 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.