Copper Alloy C70620-H08 vs C70620-O60
Copper Alloy · C70620 temper comparison
C70620-H08 and C70620-O60 are two conditions of the same copper alloy grade, C70620: H08 (spring hard) versus O60 (soft annealed). The chemistry is identical, so every difference below comes from the condition. C70620-H08 is the stronger of the two: yield strength 485 MPa (70.3 ksi) against 120 MPa (17.4 ksi) for C70620-O60, about 4.0 times as much; tensile strength follows at 525 MPa (76.1 ksi) vs 310 MPa (45 ksi). In exchange, C70620-O60 is the more ductile: elongation 40% versus 4% for C70620-H08, and C70620-H08 is harder (165 HB vs 65 HB). C70620-O60 runs hotter in service (315°C vs 200°C continuous). On the shop floor, C70620-H08 machines more easily (fair vs poor) and C70620-O60 welds better (excellent vs very good).
C70620-H08Choose it when strength drives the design, or when the part is machined in volume.
C70620-O60Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C70620-H08 vs C70620-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 124 GPa18 Msi · Shear Modulus 47 GPa6.8 Msi · Bulk Modulus 130 GPa18.9 Msi · Poisson's Ratio 0.33 · Reduction in Area 65% · Charpy V-Notch Impact (RT) 120 J88.5 ft·lbf
Physical
Density and transition temperatures.
Same in both: Density 8.94 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,100°C2,012 °F · Liquidus Temperature 1,145°C2,093 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 40 W/m·K23.1 BTU/hr·ft·°F · Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 17.1 µm/m·K9.5 µin/in·°F · Latent Heat of Fusion 210 J/g90.3 BTU/lb · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 9.5 % IACS · Electrical Resistivity 1.9×10⁻⁷ Ω·m7.48 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.28 V · Corrosion Resistance 80 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 20% · Castability 45 / 100 · Brazeability / Solderability 88 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 70 MJ/kg30,095 BTU/lb · Embodied Carbon (primary production) 5.2 kg CO₂/kg · Embodied Water 260 L/kg31.2 gal/lb · Typical Recycled Content 25%
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.
C70620-H08 vs C70620-O60 — frequently asked
Is C70620-H08 stronger than C70620-O60?
Yes. C70620-H08 has a typical yield strength of 485 MPa (70.3 ksi) against 120 MPa (17.4 ksi) for C70620-O60 — about 4.0 times as much. Tensile strength is 525 MPa (76.1 ksi) vs 310 MPa (45 ksi).
Which condition does FabDigit quote by default, H08 or O60?
O60 is the default C70620 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.
Which is easier to machine, C70620-H08 or C70620-O60?
C70620-H08. Its machinability rates fair (40/100) against poor (28/100) for C70620-O60; for welding the order is C70620-O60 first (excellent, 90/100) then C70620-H08 (very good, 75/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C70620-H08 and C70620-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.