Copper Alloy C74400-H02 vs C74400-H08
Copper Alloy · C74400 temper comparison
C74400-H02 and C74400-H08 are two conditions of the same copper alloy grade, C74400: H02 (half hard) versus H08 (spring hard). The chemistry is identical, so every difference below comes from the condition. C74400-H08 is the stronger of the two: yield strength 630 MPa (91.4 ksi) against 440 MPa (63.8 ksi) for C74400-H02, about 43% more; tensile strength follows at 725 MPa (105 ksi) vs 515 MPa (74.7 ksi). In exchange, C74400-H02 is the more ductile: elongation 12% versus 2% for C74400-H08, and C74400-H08 is harder (190 HB vs 138 HB). C74400-H02 runs hotter in service (200°C vs 150°C continuous). On the shop floor, C74400-H02 welds better (52 vs 42 out of 100).
C74400-H02Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C74400-H08Choose it when strength drives the design.
C74400-H02 vs C74400-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.
Elastic (Young's) Modulus
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: Shear Modulus 46 GPa6.7 Msi · Bulk Modulus 130 GPa18.9 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 8.7 g/cm³0.31 lb/in³ · Melting Point (Solidus) 1,020°C1,868 °F · Liquidus Temperature 1,065°C1,949 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 45 W/m·K26 BTU/hr·ft·°F · 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 · Latent Heat of Fusion 200 J/g86 BTU/lb · 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) -0.2 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 90 / 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 300 L/kg35.9 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.
C74400-H02 vs C74400-H08 — frequently asked
Is C74400-H08 stronger than C74400-H02?
Yes. C74400-H08 has a typical yield strength of 630 MPa (91.4 ksi) against 440 MPa (63.8 ksi) for C74400-H02 — about 43% more. Tensile strength is 725 MPa (105 ksi) vs 515 MPa (74.7 ksi).
Which condition does FabDigit quote by default, H02 or H08?
H02 is the default C74400 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, C74400-H02 or C74400-H08?
C74400-H08, by a small margin. Both rate poor for machinability — 30/100 against 25/100 for C74400-H02; for welding the order is C74400-H02 first (fair, 52/100) then C74400-H08 (fair, 42/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C74400-H02 and C74400-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.