Copper Alloy CC491K-GM vs CC491K-GS
Copper Alloy · CC491K temper comparison
CC491K-GM and CC491K-GS are two conditions of the same copper alloy grade, CC491K: GM (permanent mould (chill/gravity die) cast) versus GS (sand cast). The chemistry is identical, so every difference below comes from the condition. Both yield at about 120 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (permanent mould (chill/gravity die) cast versus sand cast). CC491K-GS is the more ductile: elongation 25% versus 12% for CC491K-GM, and CC491K-GM is harder (65 HB vs 60 HB).
CC491K-GSChoose it when the part is bent, formed or impact-loaded.
CC491K-GM vs CC491K-GS: 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.
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
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 100 GPa14.5 Msi · Shear Modulus 37 GPa5.4 Msi · Bulk Modulus 104 GPa15.1 Msi · Poisson's Ratio 0.34 · Tensile Strength (Ultimate) 250 MPa36.3 ksi
Physical
Density and transition temperatures.
Same in both: Density 8.83 g/cm³0.32 lb/in³ · Melting Point (Solidus) 854°C1,569 °F · Liquidus Temperature 1,010°C1,850 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 72 W/m·K41.6 BTU/hr·ft·°F · Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 18 µm/m·K10 µin/in·°F · Latent Heat of Fusion 170 J/g73.1 BTU/lb · Max Service Temperature (continuous) 200°C392 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 15 % IACS · Electrical Resistivity 1.15×10⁻⁷ Ω·m4.53 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.25 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Same in both: Machinability 85 / 100 · Machinability Rating (AISI 1212 = 100 %) 84% · Weldability 25 / 100 · Formability (cold) 15 / 100 · Castability 90 / 100 · Brazeability / Solderability 75 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 52 MJ/kg22,356 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg · Embodied Water 250 L/kg30 gal/lb · Typical Recycled Content 80%
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.
CC491K-GM vs CC491K-GS — frequently asked
What is the difference between CC491K-GM and CC491K-GS?
CC491K-GM and CC491K-GS are two conditions of the same copper alloy grade, CC491K: GM (permanent mould (chill/gravity die) cast) versus GS (sand cast). The chemistry is identical, so every difference below comes from the condition. Both yield at about 120 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (permanent mould (chill/gravity die) cast versus sand cast).
Which condition does FabDigit quote by default, GM or GS?
GS is the default CC491K 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 CC491K-GM over CC491K-GS?
Pick CC491K-GS when the part is bent, formed or impact-loaded.
Ready to make it?
Upload a CAD file and FabDigit prices the part in CC491K-GM and CC491K-GS 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.