Copper Alloy C61800-H04 vs C61800-TQ50
Copper Alloy · C61800 temper comparison
C61800-H04 and C61800-TQ50 are two conditions of the same copper alloy grade, C61800: H04 (full hard) versus TQ50 (quench hardened and tempered). The chemistry is identical, so every difference below comes from the condition. C61800-TQ50 is the stronger of the two: yield strength 450 MPa (65.3 ksi) against 415 MPa (60.2 ksi) for C61800-H04, about 8% more; tensile strength follows at 725 MPa (105 ksi) vs 655 MPa (95 ksi). In exchange, C61800-H04 is the more ductile: elongation 18% versus 12% for C61800-TQ50, and C61800-TQ50 is harder (220 HB vs 195 HB). C61800-TQ50 runs hotter in service (300°C vs 250°C continuous). On the shop floor, C61800-H04 machines more easily (fair vs poor).
C61800-H04Choose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
C61800-TQ50Choose it when strength drives the design, or when the part sees heat.
C61800-H04 vs C61800-TQ50: 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
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 117 GPa17 Msi · Shear Modulus 44 GPa6.4 Msi · Bulk Modulus 110 GPa16 Msi · Poisson's Ratio 0.32
Physical
Density and transition temperatures.
Same in both: Density 7.58 g/cm³0.27 lb/in³ · Melting Point (Solidus) 1,043°C1,909 °F · Liquidus Temperature 1,046°C1,915 °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 419 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 16.2 µm/m·K9 µin/in·°F · Latent Heat of Fusion 210 J/g90.3 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) -0.31 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 30 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 3.7 kg CO₂/kg · Embodied Water 250 L/kg30 gal/lb · Typical Recycled Content 40%
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.
C61800-H04 vs C61800-TQ50 — frequently asked
Is C61800-TQ50 stronger than C61800-H04?
Yes. C61800-TQ50 has a typical yield strength of 450 MPa (65.3 ksi) against 415 MPa (60.2 ksi) for C61800-H04 — about 8% more. Tensile strength is 725 MPa (105 ksi) vs 655 MPa (95 ksi).
Which condition does FabDigit quote by default, H04 or TQ50?
M30 is the default C61800 condition in the FabDigit quote flow (neither H04 nor TQ50). 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, C61800-H04 or C61800-TQ50?
C61800-H04. Its machinability rates fair (35/100) against poor (24/100) for C61800-TQ50; for welding the order is C61800-H04 first (good, 60/100) then C61800-TQ50 (good, 55/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C61800-H04 and C61800-TQ50 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.