Precious Metal AuCo5-AH vs AuCo5-O
Precious Metal · AuCo5 temper comparison
AuCo5-AH and AuCo5-O are two conditions of the same precious metal grade, AuCo5: AH (cold worked + age hardened) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. AuCo5-AH is the stronger of the two: yield strength 800 MPa (116 ksi) against 130 MPa (18.9 ksi) for AuCo5-O, about 6.2 times as much; tensile strength follows at 900 MPa (131 ksi) vs 330 MPa (47.9 ksi). In exchange, AuCo5-O is the more ductile: elongation 30% versus 2% for AuCo5-AH, and AuCo5-AH is harder (255 HV vs 95 HV). AuCo5-O runs hotter in service (400°C vs 350°C continuous) and AuCo5-AH conducts heat better (85 W/m·K vs 60 W/m·K). On the shop floor, AuCo5-AH machines more easily (50 vs 35 out of 100).
AuCo5-AHChoose it when strength drives the design, or when the part is machined in volume.
AuCo5-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
AuCo5-AH vs AuCo5-O: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all precious metal 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 precious metal 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, Vickers
Same in both: Elastic (Young's) Modulus 95 GPa13.8 Msi · Shear Modulus 35 GPa5.1 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.41
Physical
Density and transition temperatures.
Same in both: Density 18.2 g/cm³0.66 lb/in³ · Melting Point (Solidus) 996°C1,825 °F · Liquidus Temperature 1,025°C1,877 °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 140 J/kg·K0.03 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 14.3 µm/m·K7.9 µin/in·°F · Latent Heat of Fusion 70 J/g30.1 BTU/lb · Min Service Temperature -269°C-452 °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 92 / 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 %) 30% · Weldability 70 / 100 · Castability 60 / 100 · Brazeability / Solderability 90 / 100 · Polishability 95 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 180,000 MJ/kg7.74×10⁷ BTU/lb · Embodied Carbon (primary production) 12,000 kg CO₂/kg · Embodied Water 150,000 L/kg17,974 gal/lb · Typical Recycled Content 35%
Strength versus weight
Yield strength against density for every precious metal grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
AuCo5-AH vs AuCo5-O — frequently asked
Is AuCo5-AH stronger than AuCo5-O?
Yes. AuCo5-AH has a typical yield strength of 800 MPa (116 ksi) against 130 MPa (18.9 ksi) for AuCo5-O — about 6.2 times as much. Tensile strength is 900 MPa (131 ksi) vs 330 MPa (47.9 ksi).
Which condition does FabDigit quote by default, AH or O?
H04 is the default AuCo5 condition in the FabDigit quote flow (neither AH nor O). 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, AuCo5-AH or AuCo5-O?
AuCo5-AH, by a small margin. Both rate fair for machinability — 50/100 against 35/100 for AuCo5-O.
Ready to make it?
Upload a CAD file and FabDigit prices the part in AuCo5-AH and AuCo5-O 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.