Precious Metal 24K-H04 vs 24K-O
Precious Metal · 24K temper comparison
24K-H04 and 24K-O are two conditions of the same precious metal grade, 24K: H04 (full hard) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. 24K-H04 is the stronger of the two: yield strength 200 MPa (29 ksi) against 30 MPa (4.35 ksi) for 24K-O, about 6.7 times as much; tensile strength follows at 220 MPa (31.9 ksi) vs 125 MPa (18.1 ksi). In exchange, 24K-O is the more ductile: elongation 45% versus 4% for 24K-H04, and 24K-H04 is harder (55 HB vs 25 HB). 24K-O runs hotter in service (600°C vs 150°C continuous). On the shop floor, 24K-H04 machines more easily (fair vs poor).
24K-H04Choose it when strength drives the design, or when the part is machined in volume.
24K-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
24K-H04 vs 24K-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
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 78 GPa11.3 Msi · Shear Modulus 27 GPa3.9 Msi · Bulk Modulus 180 GPa26.1 Msi · Poisson's Ratio 0.42 · Reduction in Area 90% · Shear Strength 90 MPa13.1 ksi
Physical
Density and transition temperatures.
Same in both: Density 19.32 g/cm³0.7 lb/in³ · Melting Point (Solidus) 1,064°C1,947 °F · Liquidus Temperature 1,064°C1,947 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 318 W/m·K184 BTU/hr·ft·°F · Specific Heat Capacity 129 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 64 J/g27.4 BTU/lb · Min Service Temperature -250°C-418 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Same in both: Electrical Resistivity 2.44×10⁻⁸ Ω·m0.961 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) 0.25 V · Corrosion Resistance 100 / 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 %) 25% · Weldability 90 / 100 · Castability 85 / 100 · Brazeability / Solderability 95 / 100 · Polishability 90 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 250,000 MJ/kg1.07×10⁸ BTU/lb · Embodied Carbon (primary production) 20,000 kg CO₂/kg · Embodied Water 150,000 L/kg17,974 gal/lb · Typical Recycled Content 28%
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.
24K-H04 vs 24K-O — frequently asked
Is 24K-H04 stronger than 24K-O?
Yes. 24K-H04 has a typical yield strength of 200 MPa (29 ksi) against 30 MPa (4.35 ksi) for 24K-O — about 6.7 times as much. Tensile strength is 220 MPa (31.9 ksi) vs 125 MPa (18.1 ksi).
Which condition does FabDigit quote by default, H04 or O?
O is the default 24K 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, 24K-H04 or 24K-O?
24K-H04. Its machinability rates fair (40/100) against poor (30/100) for 24K-O.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 24K-H04 and 24K-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.