Copper Alloy C77000-H04 vs C77000-M20
Copper Alloy · C77000 temper comparison
C77000-H04 and C77000-M20 are two conditions of the same copper alloy grade, C77000: H04 (full hard) versus M20 (as hot rolled). The chemistry is identical, so every difference below comes from the condition. C77000-H04 is the stronger of the two: yield strength 585 MPa (84.8 ksi) against 205 MPa (29.7 ksi) for C77000-M20, about 185% more; tensile strength follows at 655 MPa (95 ksi) vs 435 MPa (63.1 ksi). In exchange, C77000-M20 is the more ductile: elongation 35% versus 4% for C77000-H04, and C77000-H04 is harder (195 HV vs 115 HV). C77000-M20 runs hotter in service (250°C vs 150°C continuous).
C77000-H04Choose it when strength drives the design.
C77000-M20Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C77000-H04 vs C77000-M20: 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, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 124 GPa18 Msi · Shear Modulus 47 GPa6.8 Msi · Bulk Modulus 121 GPa17.5 Msi · Poisson's Ratio 0.33 · Hardness, Brinell 160 HB
Physical
Density and transition temperatures.
Same in both: Density 8.72 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,010°C1,850 °F · Liquidus Temperature 1,054°C1,929 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 29 W/m·K16.8 BTU/hr·ft·°F · Specific Heat Capacity 376 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 190 J/g81.7 BTU/lb · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 5.5 % IACS · Electrical Resistivity 3.11×10⁻⁷ Ω·m12.2 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.25 V · Corrosion Resistance 62 / 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 40 / 100 · Brazeability / Solderability 78 / 100 · Polishability 90 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 78 MJ/kg33,534 BTU/lb · Embodied Carbon (primary production) 5.6 kg CO₂/kg · Embodied Water 260 L/kg31.2 gal/lb · Typical Recycled Content 35%
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.
C77000-H04 vs C77000-M20 — frequently asked
Is C77000-H04 stronger than C77000-M20?
Yes. C77000-H04 has a typical yield strength of 585 MPa (84.8 ksi) against 205 MPa (29.7 ksi) for C77000-M20 — about 185% more. Tensile strength is 655 MPa (95 ksi) vs 435 MPa (63.1 ksi).
Which condition does FabDigit quote by default, H04 or M20?
H02 is the default C77000 condition in the FabDigit quote flow (neither H04 nor M20). 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 C77000-H04 over C77000-M20?
Pick C77000-H04 when strength drives the design. Pick C77000-M20 when the part is bent, formed or impact-loaded, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C77000-H04 and C77000-M20 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.