Copper Alloy C75400-H02 vs C75400-H08
Copper Alloy · C75400 temper comparison
C75400-H02 and C75400-H08 are two conditions of the same copper alloy grade, C75400: H02 (half 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 425 MPa (61.6 ksi) for C75400-H02, about 42% more; tensile strength follows at 675 MPa (97.9 ksi) vs 515 MPa (74.7 ksi). In exchange, C75400-H02 is the more ductile: elongation 12% versus 2% for C75400-H08, and C75400-H08 is harder (200 HB vs 140 HB). C75400-H02 runs hotter in service (200°C vs 150°C continuous). On the shop floor, C75400-H02 welds better (45 vs 35 out of 100).
C75400-H02Choose 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-H02 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-H02 vs C75400-H08 — frequently asked
Is C75400-H08 stronger than C75400-H02?
Yes. C75400-H08 has a typical yield strength of 605 MPa (87.7 ksi) against 425 MPa (61.6 ksi) for C75400-H02 — about 42% more. Tensile strength is 675 MPa (97.9 ksi) vs 515 MPa (74.7 ksi).
Which condition does FabDigit quote by default, H02 or H08?
H02 is the default C75400 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, C75400-H02 or C75400-H08?
C75400-H08. Its machinability rates fair (35/100) against poor (30/100) for C75400-H02; for welding the order is C75400-H02 first (fair, 45/100) then C75400-H08 (fair, 35/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C75400-H02 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.