Copper Alloy C12900-H08 vs C12900-M30
Copper Alloy · C12900 temper comparison
C12900-H08 and C12900-M30 are two conditions of the same copper alloy grade, C12900: H08 (spring hard) versus M30 (as hot extruded). The chemistry is identical, so every difference below comes from the condition. C12900-H08 is the stronger of the two: yield strength 310 MPa (45 ksi) against 69 MPa (10 ksi) for C12900-M30, about 4.5 times as much; tensile strength follows at 345 MPa (50 ksi) vs 220 MPa (31.9 ksi). In exchange, C12900-M30 is the more ductile: elongation 50% versus 4% for C12900-H08, and C12900-H08 is harder (105 HB vs 42 HB). C12900-M30 runs hotter in service (250°C vs 200°C continuous).
C12900-H08Choose it when strength drives the design.
C12900-M30Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C12900-H08 vs C12900-M30: 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)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 120 GPa17.4 Msi · Shear Modulus 45 GPa6.5 Msi · Bulk Modulus 140 GPa20.3 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 8.94 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,065°C1,949 °F · Liquidus Temperature 1,083°C1,981 °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 385 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 17 µm/m·K9.4 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: Machinability Rating (AISI 1212 = 100 %) 20% · Weldability 40 / 100 · Castability 45 / 100 · Brazeability / Solderability 90 / 100 · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 57 MJ/kg24,506 BTU/lb · Embodied Carbon (primary production) 3.9 kg CO₂/kg · Embodied Water 270 L/kg32.4 gal/lb · Typical Recycled Content 50%
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.
C12900-H08 vs C12900-M30 — frequently asked
Is C12900-H08 stronger than C12900-M30?
Yes. C12900-H08 has a typical yield strength of 310 MPa (45 ksi) against 69 MPa (10 ksi) for C12900-M30 — about 4.5 times as much. Tensile strength is 345 MPa (50 ksi) vs 220 MPa (31.9 ksi).
Which condition does FabDigit quote by default, H08 or M30?
H04 is the default C12900 condition in the FabDigit quote flow (neither H08 nor M30). 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, C12900-H08 or C12900-M30?
C12900-H08, by a small margin. Both rate poor for machinability — 27/100 against 18/100 for C12900-M30.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C12900-H08 and C12900-M30 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.