Copper Alloy C75400-H04 vs C75400-H08
Copper Alloy · C75400 temper comparison
C75400-H04 and C75400-H08 are two conditions of the same copper alloy grade, C75400: H04 (full hard) versus H08 (spring hard). The chemistry is identical, so every difference below comes from the condition. C75400-H08 is the stronger of the two: yield strength 605 MPa (87.7 ksi) against 510 MPa (74 ksi) for C75400-H04, about 19% more; tensile strength follows at 675 MPa (97.9 ksi) vs 585 MPa (84.8 ksi). In exchange, C75400-H04 is the more ductile: elongation 5% versus 2% for C75400-H08, and C75400-H08 is harder (200 HB vs 165 HB). C75400-H04 runs hotter in service (180°C vs 150°C continuous). On the shop floor, C75400-H04 welds better (45 vs 35 out of 100).
C75400-H04Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C75400-H08Choose it when strength drives the design.
C75400-H04 vs C75400-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
Shear Strength
Fatigue Strength (Endurance Limit)
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 122 GPa17.7 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 8.72 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,021°C1,870 °F · Liquidus Temperature 1,054°C1,929 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 16.2 µm/m·K9 µin/in·°F · Min Service Temperature -200°C-328 °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
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Brazeability / Solderability 80 / 100 · Polishability 88 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 78 MJ/kg33,534 BTU/lb · Embodied Carbon (primary production) 5.2 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.
C75400-H04 vs C75400-H08 — frequently asked
Is C75400-H08 stronger than C75400-H04?
Yes. C75400-H08 has a typical yield strength of 605 MPa (87.7 ksi) against 510 MPa (74 ksi) for C75400-H04 — about 19% more. Tensile strength is 675 MPa (97.9 ksi) vs 585 MPa (84.8 ksi).
Which condition does FabDigit quote by default, H04 or H08?
H02 is the default C75400 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, C75400-H04 or C75400-H08?
C75400-H04. Its weldability rates fair (45/100) against fair (35/100) for C75400-H08.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C75400-H04 and C75400-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.