Copper Alloy C69400-M20 vs C69400-O60
Copper Alloy · C69400 temper comparison
C69400-M20 and C69400-O60 are two conditions of the same copper alloy grade, C69400: M20 (as hot rolled) versus O60 (soft annealed). The chemistry is identical, so every difference below comes from the condition. C69400-M20 is the stronger of the two: yield strength 310 MPa (45 ksi) against 205 MPa (29.7 ksi) for C69400-O60, about 51% more; tensile strength follows at 590 MPa (85.6 ksi) vs 480 MPa (69.6 ksi). In exchange, C69400-O60 is the more ductile: elongation 35% versus 25% for C69400-M20, and C69400-M20 is harder (155 HB vs 115 HB).
C69400-M20Choose it when strength drives the design.
C69400-O60Choose it when the part is bent, formed or impact-loaded.
C69400-M20 vs C69400-O60: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 103 GPa14.9 Msi · Shear Modulus 38 GPa5.5 Msi · Bulk Modulus 107 GPa15.5 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 8.3 g/cm³0.3 lb/in³ · Melting Point (Solidus) 820°C1,508 °F · Liquidus Temperature 917°C1,683 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 20.2 µm/m·K11.2 µin/in·°F · Latent Heat of Fusion 190 J/g81.7 BTU/lb · Max Service Temperature (continuous) 200°C392 °F · Min Service Temperature -196°C-321 °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 66 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 45 / 100 · Castability 45 / 100 · Brazeability / Solderability 75 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg · Embodied Water 250 L/kg30 gal/lb · Typical Recycled Content 40%
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.
C69400-M20 vs C69400-O60 — frequently asked
Is C69400-M20 stronger than C69400-O60?
Yes. C69400-M20 has a typical yield strength of 310 MPa (45 ksi) against 205 MPa (29.7 ksi) for C69400-O60 — about 51% more. Tensile strength is 590 MPa (85.6 ksi) vs 480 MPa (69.6 ksi).
Which condition does FabDigit quote by default, M20 or O60?
M30 is the default C69400 condition in the FabDigit quote flow (neither M20 nor O60). 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.
Which is easier to machine, C69400-M20 or C69400-O60?
C69400-M20, by a small margin. Both rate poor for machinability — 30/100 against 25/100 for C69400-O60.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C69400-M20 and C69400-O60 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.