Precious Metal S800-O vs S800-PH
Precious Metal · S800 temper comparison
S800-O and S800-PH are two conditions of the same precious metal grade, S800: O (annealed) versus PH (pre-hardened). The chemistry is identical, so every difference below comes from the condition. S800-PH is the stronger of the two: yield strength 470 MPa (68.2 ksi) against 110 MPa (16 ksi) for S800-O, about 4.3 times as much; tensile strength follows at 560 MPa (81.2 ksi) vs 310 MPa (45 ksi). In exchange, S800-O is the more ductile: elongation 35% versus 6% for S800-PH, and S800-PH is harder (160 HB vs 66 HB). S800-O runs hotter in service (200°C vs 180°C continuous) and S800-PH conducts electricity better (68 % IACS vs 60 % IACS). On the shop floor, S800-PH machines more easily (good vs fair) and S800-O welds better (good vs fair).
S800-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
S800-PHChoose it when strength drives the design, or when the part is machined in volume.
S800-O vs S800-PH: 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
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Shear Modulus 30 GPa4.4 Msi · Bulk Modulus 103 GPa14.9 Msi · Poisson's Ratio 0.37
Physical
Density and transition temperatures.
Same in both: Density 10.1 g/cm³0.36 lb/in³ · Melting Point (Solidus) 779°C1,434 °F · Liquidus Temperature 820°C1,508 °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 265 J/kg·K0.06 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 19 µm/m·K10.6 µin/in·°F · Latent Heat of Fusion 125 J/g53.7 BTU/lb · Min Service Temperature -100°C-148 °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) -0.05 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 80 / 100 · Brazeability / Solderability 90 / 100 · Polishability 90 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 1,250 MJ/kg537,404 BTU/lb · Embodied Carbon (primary production) 85 kg CO₂/kg · Embodied Water 3,000 L/kg359 gal/lb · Typical Recycled Content 45%
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.
S800-O vs S800-PH — frequently asked
Is S800-PH stronger than S800-O?
Yes. S800-PH has a typical yield strength of 470 MPa (68.2 ksi) against 110 MPa (16 ksi) for S800-O — about 4.3 times as much. Tensile strength is 560 MPa (81.2 ksi) vs 310 MPa (45 ksi).
Which condition does FabDigit quote by default, O or PH?
O is the default S800 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, S800-O or S800-PH?
S800-PH. Its machinability rates good (65/100) against fair (50/100) for S800-O; for welding the order is S800-O first (good, 60/100) then S800-PH (fair, 45/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in S800-O and S800-PH 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.