Copper Alloy C18000-H vs C18000-TH04
Copper Alloy · C18000 temper comparison
C18000-H and C18000-TH04 are two conditions of the same copper alloy grade, C18000: H (hardened) versus TH04 (TD04 and precipitation hardened). The chemistry is identical, so every difference below comes from the condition. C18000-TH04 is the stronger of the two: yield strength 690 MPa (100 ksi) against 585 MPa (84.8 ksi) for C18000-H, about 18% more; tensile strength follows at 760 MPa (110 ksi) vs 690 MPa (100 ksi). In exchange, C18000-H is the more ductile: elongation 12% versus 8% for C18000-TH04, and C18000-TH04 is harder (225 HB vs 200 HB).
C18000-HChoose it when the part is bent, formed or impact-loaded.
C18000-TH04Choose it when strength drives the design.
C18000-H vs C18000-TH04: 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
Hardness, Brinell
Hardness, Rockwell B
Same in both: Elastic (Young's) Modulus 131 GPa19 Msi · Shear Modulus 49 GPa7.1 Msi · Bulk Modulus 133 GPa19.3 Msi · Poisson's Ratio 0.33 · Fatigue Strength (Endurance Limit) 235 MPa34.1 ksi · Hardness, Vickers 210 HV
Physical
Density and transition temperatures.
Same in both: Density 8.78 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,030°C1,886 °F · Liquidus Temperature 1,075°C1,967 °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 376 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 17.6 µm/m·K9.8 µin/in·°F · Latent Heat of Fusion 205 J/g88.1 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).
Same in both: Galvanic Potential (seawater, vs SCE) -0.25 V · Corrosion Resistance 60 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Same in both: Weldability 35 / 100 · Brazeability / Solderability 80 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 56 MJ/kg24,076 BTU/lb · Embodied Carbon (primary production) 4 kg CO₂/kg · Embodied Water 300 L/kg35.9 gal/lb · Typical Recycled Content 30%
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.
C18000-H vs C18000-TH04 — frequently asked
Is C18000-TH04 stronger than C18000-H?
Yes. C18000-TH04 has a typical yield strength of 690 MPa (100 ksi) against 585 MPa (84.8 ksi) for C18000-H — about 18% more. Tensile strength is 760 MPa (110 ksi) vs 690 MPa (100 ksi).
Which condition does FabDigit quote by default, H or TH04?
H is the default C18000 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, C18000-H or C18000-TH04?
C18000-TH04. Its machinability rates good (55/100) against fair (50/100) for C18000-H.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C18000-H and C18000-TH04 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.