Copper Alloy C28000-H04 vs C28000-O
Copper Alloy · C28000 temper comparison
C28000-H04 and C28000-O are two conditions of the same copper alloy grade, C28000: H04 (full hard) versus O (annealed). 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 145 MPa (21 ksi) for C28000-O, about 186% more; tensile strength follows at 500 MPa (72.5 ksi) vs 372 MPa (54 ksi). In exchange, C28000-O is the more ductile: elongation 45% versus 6% for C28000-H04, and C28000-H04 is harder (150 HB vs 75 HB). C28000-O runs hotter in service (200°C vs 120°C continuous).
C28000-H04Choose it when strength drives the design.
C28000-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C28000-H04 vs C28000-O: 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.
Same in both: Density 8.39 g/cm³0.3 lb/in³ · Melting Point (Solidus) 900°C1,652 °F · Liquidus Temperature 905°C1,661 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
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 · Min Service Temperature -100°C-148 °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) -0.28 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Castability 55 / 100 · Brazeability / Solderability 85 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 48 MJ/kg20,636 BTU/lb · Embodied Carbon (primary production) 3 kg CO₂/kg · Embodied Water 200 L/kg24 gal/lb · Typical Recycled Content 70%
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-H04 vs C28000-O — frequently asked
Is C28000-H04 stronger than C28000-O?
Yes. C28000-H04 has a typical yield strength of 415 MPa (60.2 ksi) against 145 MPa (21 ksi) for C28000-O — about 186% more. Tensile strength is 500 MPa (72.5 ksi) vs 372 MPa (54 ksi).
Which condition does FabDigit quote by default, H04 or O?
O is the default C28000 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, C28000-H04 or C28000-O?
C28000-H04, by a small margin. Both rate good for machinability — 60/100 against 55/100 for C28000-O; for welding the order is C28000-O first (fair, 50/100) then C28000-H04 (fair, 45/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C28000-H04 and C28000-O 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.