Copper Alloy C68700-H80 vs C68700-M30
Copper Alloy · C68700 temper comparison
C68700-H80 and C68700-M30 are two conditions of the same copper alloy grade, C68700: H80 (hard drawn) versus M30 (as hot extruded). The chemistry is identical, so every difference below comes from the condition. C68700-H80 is the stronger of the two: yield strength 415 MPa (60.2 ksi) against 170 MPa (24.7 ksi) for C68700-M30, about 144% more; tensile strength follows at 560 MPa (81.2 ksi) vs 400 MPa (58 ksi). In exchange, C68700-M30 is the more ductile: elongation 50% versus 12% for C68700-H80, and C68700-H80 is harder (150 HB vs 85 HB). C68700-M30 runs hotter in service (200°C vs 150°C continuous). On the shop floor, C68700-H80 machines more easily (fair vs poor).
C68700-H80Choose it when strength drives the design, or when the part is machined in volume.
C68700-M30Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C68700-H80 vs C68700-M30: 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 39 GPa5.7 Msi · Bulk Modulus 105 GPa15.2 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 8.33 g/cm³0.3 lb/in³ · Melting Point (Solidus) 971°C1,780 °F · Liquidus Temperature 1,027°C1,881 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 100 W/m·K57.8 BTU/hr·ft·°F · Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 18 µm/m·K10 µin/in·°F · Latent Heat of Fusion 200 J/g86 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.3 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Brazeability / Solderability 85 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 52 MJ/kg22,356 BTU/lb · Embodied Carbon (primary production) 3.6 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.
C68700-H80 vs C68700-M30 — frequently asked
Is C68700-H80 stronger than C68700-M30?
Yes. C68700-H80 has a typical yield strength of 415 MPa (60.2 ksi) against 170 MPa (24.7 ksi) for C68700-M30 — about 144% more. Tensile strength is 560 MPa (81.2 ksi) vs 400 MPa (58 ksi).
Which condition does FabDigit quote by default, H80 or M30?
O61 is the default C68700 condition in the FabDigit quote flow (neither H80 nor M30). 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, C68700-H80 or C68700-M30?
C68700-H80. Its machinability rates fair (45/100) against poor (30/100) for C68700-M30; for welding the order is C68700-M30 first (fair, 35/100) then C68700-H80 (poor, 30/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C68700-H80 and C68700-M30 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.