Copper Alloy C70700-H04 vs C70700-M20
Copper Alloy · C70700 temper comparison
C70700-H04 and C70700-M20 are two conditions of the same copper alloy grade, C70700: H04 (full hard) versus M20 (as hot rolled). The chemistry is identical, so every difference below comes from the condition. C70700-H04 is the stronger of the two: yield strength 395 MPa (57.3 ksi) against 125 MPa (18.1 ksi) for C70700-M20, about 3.2 times as much; tensile strength follows at 435 MPa (63.1 ksi) vs 305 MPa (44.2 ksi). In exchange, C70700-M20 is the more ductile: elongation 35% versus 10% for C70700-H04, and C70700-H04 is harder (150 HB vs 70 HB). C70700-M20 runs hotter in service (350°C vs 250°C continuous). On the shop floor, C70700-M20 welds better (excellent vs very good).
C70700-H04Choose it when strength drives the design.
C70700-M20Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C70700-H04 vs C70700-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
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 124 GPa18 Msi · Shear Modulus 46 GPa6.7 Msi · Bulk Modulus 112 GPa16.2 Msi · Poisson's Ratio 0.31
Physical
Density and transition temperatures.
Same in both: Density 8.94 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,100°C2,012 °F · Liquidus Temperature 1,145°C2,093 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 40 W/m·K23.1 BTU/hr·ft·°F · Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 17.1 µm/m·K9.5 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) -0.28 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 45 / 100 · Brazeability / Solderability 88 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 70 MJ/kg30,095 BTU/lb · Embodied Carbon (primary production) 4.8 kg CO₂/kg · Embodied Water 260 L/kg31.2 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.
C70700-H04 vs C70700-M20 — frequently asked
Is C70700-H04 stronger than C70700-M20?
Yes. C70700-H04 has a typical yield strength of 395 MPa (57.3 ksi) against 125 MPa (18.1 ksi) for C70700-M20 — about 3.2 times as much. Tensile strength is 435 MPa (63.1 ksi) vs 305 MPa (44.2 ksi).
Which condition does FabDigit quote by default, H04 or M20?
O61 is the default C70700 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, C70700-H04 or C70700-M20?
C70700-H04. Its machinability rates fair (35/100) against poor (28/100) for C70700-M20; for welding the order is C70700-M20 first (excellent, 88/100) then C70700-H04 (very good, 78/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C70700-H04 and C70700-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.