Copper Alloy C28000-H03 vs C28000-H04
Copper Alloy · C28000 temper comparison
C28000-H03 and C28000-H04 are two conditions of the same copper alloy grade, C28000: H03 (three-quarter hard) versus H04 (full hard). The chemistry is identical, so every difference below comes from the condition. C28000-H04 is the stronger of the two: yield strength 415 MPa (60.2 ksi) against 380 MPa (55.1 ksi) for C28000-H03, about 9% more. In exchange, C28000-H03 is the more ductile: elongation 12% versus 6% for C28000-H04, and C28000-H04 is harder (150 HB vs 135 HB). C28000-H03 runs hotter in service (150°C vs 120°C continuous).
C28000-H03Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C28000-H04Choose it when strength drives the design.
C28000-H03 vs C28000-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
Same in both: Elastic (Young's) Modulus 105 GPa15.2 Msi · Shear Modulus 39 GPa5.7 Msi · Bulk Modulus 112 GPa16.2 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Melting Point (Solidus)
Liquidus Temperature
Same in both: Density 8.39 g/cm³0.3 lb/in³
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Thermal Conductivity 123 W/m·K71.1 BTU/hr·ft·°F · Specific Heat Capacity 375 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 20.8 µm/m·K11.6 µin/in·°F · Latent Heat of Fusion 160 J/g68.8 BTU/lb
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) -0.28 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Polishability
Same in both: Castability 55 / 100 · Brazeability / Solderability 85 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
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.
C28000-H03 vs C28000-H04 — frequently asked
Is C28000-H04 stronger than C28000-H03?
Yes. C28000-H04 has a typical yield strength of 415 MPa (60.2 ksi) against 380 MPa (55.1 ksi) for C28000-H03 — about 9% more. Tensile strength is 500 MPa (72.5 ksi) vs 505 MPa (73.2 ksi).
Which condition does FabDigit quote by default, H03 or H04?
O is the default C28000 condition in the FabDigit quote flow (neither H03 nor H04). 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, C28000-H03 or C28000-H04?
C28000-H04. Its machinability rates good (60/100) against fair (52/100) for C28000-H03; for welding the order is C28000-H04 first (fair, 45/100) then C28000-H03 (fair, 40/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C28000-H03 and C28000-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.