Precious Metal AuNi-H04 vs AuNi-O
Precious Metal · AuNi temper comparison
AuNi-H04 and AuNi-O are two conditions of the same precious metal grade, AuNi: H04 (full hard) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. AuNi-H04 is the stronger of the two: yield strength 620 MPa (89.9 ksi) against 180 MPa (26.1 ksi) for AuNi-O, about 3.4 times as much; tensile strength follows at 700 MPa (102 ksi) vs 400 MPa (58 ksi). In exchange, AuNi-O is the more ductile: elongation 30% versus 3% for AuNi-H04, and AuNi-H04 is harder (215 HV vs 125 HV). AuNi-O runs hotter in service (500°C vs 400°C continuous). On the shop floor, AuNi-H04 machines more easily (45 vs 35 out of 100).
AuNi-H04Choose it when strength drives the design, or when the part is machined in volume.
AuNi-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
AuNi-H04 vs AuNi-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 175 GPa25.4 Msi · Poisson's Ratio 0.41
Physical
Density and transition temperatures.
Same in both: Density 18.3 g/cm³0.66 lb/in³ · Melting Point (Solidus) 955°C1,751 °F · Liquidus Temperature 975°C1,787 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 58 W/m·K33.5 BTU/hr·ft·°F · Specific Heat Capacity 145 J/kg·K0.03 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 14.2 µm/m·K7.9 µin/in·°F · Latent Heat of Fusion 75 J/g32.2 BTU/lb · Min Service Temperature -250°C-418 °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 96 / 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 %) 40% · Weldability 75 / 100 · Castability 70 / 100 · Brazeability / Solderability 90 / 100 · Polishability 95 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 240,000 MJ/kg1.03×10⁸ BTU/lb · Embodied Carbon (primary production) 24,000 kg CO₂/kg · Embodied Water 200,000 L/kg23,965 gal/lb · Typical Recycled Content 30%
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.
AuNi-H04 vs AuNi-O — frequently asked
Is AuNi-H04 stronger than AuNi-O?
Yes. AuNi-H04 has a typical yield strength of 620 MPa (89.9 ksi) against 180 MPa (26.1 ksi) for AuNi-O — about 3.4 times as much. Tensile strength is 700 MPa (102 ksi) vs 400 MPa (58 ksi).
Which condition does FabDigit quote by default, H04 or O?
H04 is the default AuNi 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.
Which is easier to machine, AuNi-H04 or AuNi-O?
AuNi-H04, by a small margin. Both rate fair for machinability — 45/100 against 35/100 for AuNi-O.
Ready to make it?
Upload a CAD file and FabDigit prices the part in AuNi-H04 and AuNi-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.