Copper Alloy C71000-H04 vs C71000-M20
Copper Alloy · C71000 temper comparison
C71000-H04 and C71000-M20 are two conditions of the same copper alloy grade, C71000: H04 (full hard) versus M20 (as hot rolled). The chemistry is identical, so every difference below comes from the condition. C71000-H04 is the stronger of the two: yield strength 515 MPa (74.7 ksi) against 140 MPa (20.3 ksi) for C71000-M20, about 3.7 times as much; tensile strength follows at 550 MPa (79.8 ksi) vs 365 MPa (52.9 ksi). In exchange, C71000-M20 is the more ductile: elongation 35% versus 5% for C71000-H04, and C71000-H04 is harder (160 HB vs 82 HB). C71000-M20 runs hotter in service (320°C vs 180°C continuous). On the shop floor, C71000-M20 welds better (excellent vs very good).
C71000-H04Choose it when strength drives the design.
C71000-M20Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C71000-H04 vs C71000-M20: 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 138 GPa20 Msi · Shear Modulus 52 GPa7.5 Msi · Bulk Modulus 132 GPa19.1 Msi · Poisson's Ratio 0.32 · Reduction in Area 65% · Hardness, Vickers 80 HV
Physical
Density and transition temperatures.
Same in both: Density 8.94 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,099°C2,010 °F · Liquidus Temperature 1,149°C2,100 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 37 W/m·K21.4 BTU/hr·ft·°F · Specific Heat Capacity 380 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 15.6 µm/m·K8.7 µin/in·°F · Latent Heat of Fusion 205 J/g88.1 BTU/lb · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 6.5 % IACS · Electrical Resistivity 2.65×10⁻⁷ Ω·m10.4 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.27 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 20% · Castability 45 / 100 · Brazeability / Solderability 88 / 100 · Polishability 85 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 72 MJ/kg30,954 BTU/lb · Embodied Carbon (primary production) 5.2 kg CO₂/kg · Embodied Water 320 L/kg38.3 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.
C71000-H04 vs C71000-M20 — frequently asked
Is C71000-H04 stronger than C71000-M20?
Yes. C71000-H04 has a typical yield strength of 515 MPa (74.7 ksi) against 140 MPa (20.3 ksi) for C71000-M20 — about 3.7 times as much. Tensile strength is 550 MPa (79.8 ksi) vs 365 MPa (52.9 ksi).
Which condition does FabDigit quote by default, H04 or M20?
O61 is the default C71000 condition in the FabDigit quote flow (neither H04 nor M20). 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, C71000-H04 or C71000-M20?
C71000-H04, by a small margin. Both rate poor for machinability — 28/100 against 20/100 for C71000-M20; for welding the order is C71000-M20 first (excellent, 85/100) then C71000-H04 (very good, 75/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C71000-H04 and C71000-M20 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.