Copper Alloy C77600-H04 vs C77600-H08
Copper Alloy · C77600 temper comparison
C77600-H04 and C77600-H08 are two conditions of the same copper alloy grade, C77600: H04 (full hard) versus H08 (spring hard). The chemistry is identical, so every difference below comes from the condition. C77600-H08 is the stronger of the two: yield strength 660 MPa (95.7 ksi) against 550 MPa (79.8 ksi) for C77600-H04, about 20% more; tensile strength follows at 740 MPa (107 ksi) vs 620 MPa (89.9 ksi). In exchange, C77600-H04 is the more ductile: elongation 5% versus 2% for C77600-H08, and C77600-H08 is harder (207 HB vs 174 HB). C77600-H04 runs hotter in service (175°C vs 150°C continuous).
C77600-H04Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C77600-H08Choose it when strength drives the design.
C77600-H04 vs C77600-H08: 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 125 GPa18.1 Msi · Shear Modulus 47 GPa6.8 Msi · Bulk Modulus 120 GPa17.4 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 8.7 g/cm³0.31 lb/in³ · Melting Point (Solidus) 1,030°C1,886 °F · Liquidus Temperature 1,080°C1,976 °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 380 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 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) -0.27 V
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 %) 30% · Brazeability / Solderability 85 / 100 · Polishability 88 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 62 MJ/kg26,655 BTU/lb · Embodied Carbon (primary production) 4.5 kg CO₂/kg · Embodied Water 260 L/kg31.2 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.
C77600-H04 vs C77600-H08 — frequently asked
Is C77600-H08 stronger than C77600-H04?
Yes. C77600-H08 has a typical yield strength of 660 MPa (95.7 ksi) against 550 MPa (79.8 ksi) for C77600-H04 — about 20% more. Tensile strength is 740 MPa (107 ksi) vs 620 MPa (89.9 ksi).
Which condition does FabDigit quote by default, H04 or H08?
H02 is the default C77600 condition in the FabDigit quote flow (neither H04 nor H08). 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 welds better, C77600-H04 or C77600-H08?
C77600-H04. Its weldability rates fair (50/100) against fair (45/100) for C77600-H08.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C77600-H04 and C77600-H08 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.