Precious Metal AuNi Cast vs AuNi-H08
Precious Metal · AuNi temper comparison
AuNi Cast and AuNi-H08 are two conditions of the same precious metal grade, AuNi: Cast (as cast) versus H08 (spring hard). The chemistry is identical, so every difference below comes from the condition. AuNi-H08 is the stronger of the two: yield strength 760 MPa (110 ksi) against 150 MPa (21.8 ksi) for AuNi Cast, about 5.1 times as much; tensile strength follows at 820 MPa (119 ksi) vs 350 MPa (50.8 ksi). In exchange, AuNi Cast is the more ductile: elongation 20% versus 1.5% for AuNi-H08, and AuNi-H08 is harder (240 HV vs 110 HV). AuNi Cast runs hotter in service (400°C vs 300°C continuous). On the shop floor, AuNi-H08 machines more easily (good vs fair) and AuNi Cast welds better (very good vs good).
AuNi CastChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
AuNi-H08Choose it when strength drives the design, or when the part is machined in volume.
AuNi Cast vs AuNi-H08: 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.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Vickers
Same in both: 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.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: 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).
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.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: 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 Cast vs AuNi-H08 — frequently asked
Is AuNi-H08 stronger than AuNi Cast?
Yes. AuNi-H08 has a typical yield strength of 760 MPa (110 ksi) against 150 MPa (21.8 ksi) for AuNi Cast — about 5.1 times as much. Tensile strength is 820 MPa (119 ksi) vs 350 MPa (50.8 ksi).
Which condition does FabDigit quote by default, Cast or H08?
H04 is the default AuNi condition in the FabDigit quote flow (neither Cast nor H08). 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 Cast or AuNi-H08?
AuNi-H08. Its machinability rates good (55/100) against fair (40/100) for AuNi Cast; for welding the order is AuNi Cast first (very good, 78/100) then AuNi-H08 (good, 68/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in AuNi Cast and AuNi-H08 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.