Copper Alloy C74400-H02 vs C74400-H04
Copper Alloy · C74400 temper comparison
C74400-H02 and C74400-H04 are two conditions of the same copper alloy grade, C74400: H02 (half hard) versus H04 (full hard). The chemistry is identical, so every difference below comes from the condition. C74400-H04 is the stronger of the two: yield strength 545 MPa (79 ksi) against 440 MPa (63.8 ksi) for C74400-H02, about 24% more; tensile strength follows at 620 MPa (89.9 ksi) vs 515 MPa (74.7 ksi). In exchange, C74400-H02 is the more ductile: elongation 12% versus 4% for C74400-H04, and C74400-H04 is harder (170 HB vs 138 HB).
C74400-H02Choose it when the part is bent, formed or impact-loaded.
C74400-H04Choose it when strength drives the design.
C74400-H02 vs C74400-H04: 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 124 GPa18 Msi · 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-H04 — frequently asked
Is C74400-H04 stronger than C74400-H02?
Yes. C74400-H04 has a typical yield strength of 545 MPa (79 ksi) against 440 MPa (63.8 ksi) for C74400-H02 — about 24% more. Tensile strength is 620 MPa (89.9 ksi) vs 515 MPa (74.7 ksi).
Which condition does FabDigit quote by default, H02 or H04?
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-H04?
C74400-H04, by a small margin. Both rate poor for machinability — 30/100 against 25/100 for C74400-H02.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C74400-H02 and C74400-H04 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.