Copper Alloy C81700-M vs C81700-TF00
Copper Alloy · C81700 temper comparison
C81700-M and C81700-TF00 are two conditions of the same copper alloy grade, C81700: M (thermomechanically controlled processed) versus TF00 (solution heat treated and precipitation hardened). The chemistry is identical, so every difference below comes from the condition. C81700-TF00 is the stronger of the two: yield strength 515 MPa (74.7 ksi) against 140 MPa (20.3 ksi) for C81700-M, about 3.7 times as much; tensile strength follows at 655 MPa (95 ksi) vs 310 MPa (45 ksi). In exchange, C81700-M is the more ductile: elongation 20% versus 5% for C81700-TF00, and C81700-TF00 is harder (200 HB vs 75 HB). C81700-M runs hotter in service (250°C vs 200°C continuous) and C81700-TF00 conducts heat better (190 W/m·K vs 145 W/m·K).
C81700-MChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C81700-TF00Choose it when strength drives the design.
C81700-M vs C81700-TF00: 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
Hardness, Brinell
Hardness, Rockwell B
Same in both: Elastic (Young's) Modulus 130 GPa18.9 Msi · Shear Modulus 50 GPa7.3 Msi · Bulk Modulus 120 GPa17.4 Msi · Poisson's Ratio 0.3 · Shear Strength 420 MPa60.9 ksi · Fatigue Strength (Endurance Limit) 240 MPa34.8 ksi · Hardness, Rockwell C 20 HRC
Physical
Density and transition temperatures.
Same in both: Density 8.75 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,030°C1,886 °F · Liquidus Temperature 1,070°C1,958 °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 420 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 17.5 µm/m·K9.7 µin/in·°F · Latent Heat of Fusion 205 J/g88.1 BTU/lb · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.2 V · Corrosion Resistance 65 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability Rating (AISI 1212 = 100 %)
Same in both: Machinability 45 / 100 · Weldability 45 / 100 · Castability 80 / 100 · Brazeability / Solderability 60 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 70 MJ/kg30,095 BTU/lb · Embodied Carbon (primary production) 4.5 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.
C81700-M vs C81700-TF00 — frequently asked
Is C81700-TF00 stronger than C81700-M?
Yes. C81700-TF00 has a typical yield strength of 515 MPa (74.7 ksi) against 140 MPa (20.3 ksi) for C81700-M — about 3.7 times as much. Tensile strength is 655 MPa (95 ksi) vs 310 MPa (45 ksi).
Which condition does FabDigit quote by default, M or TF00?
TF00 is the default C81700 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.
When should I choose C81700-M over C81700-TF00?
Pick C81700-M when the part is bent, formed or impact-loaded, or when the part sees heat. Pick C81700-TF00 when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C81700-M and C81700-TF00 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.