Precious Metal B522 Class I Annealed vs B522 Class I Hard
Precious Metal · B522 Class I temper comparison
B522 Class I Annealed and B522 Class I Hard are two conditions of the same precious metal grade, B522 Class I: Annealed versus Hard (work Hardened). The chemistry is identical, so every difference below comes from the condition. B522 Class I Hard is the stronger of the two: yield strength 700 MPa (102 ksi) against 180 MPa (26.1 ksi) for B522 Class I Annealed, about 3.9 times as much; tensile strength follows at 800 MPa (116 ksi) vs 390 MPa (56.6 ksi). In exchange, B522 Class I Annealed is the more ductile: elongation 30% versus 2.5% for B522 Class I Hard, and B522 Class I Hard is harder (220 HV vs 100 HV). B522 Class I Annealed runs hotter in service (400°C vs 250°C continuous). On the shop floor, B522 Class I Hard machines more easily (50 vs 35 out of 100).
B522 Class I AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
B522 Class I HardChoose it when strength drives the design, or when the part is machined in volume.
B522 Class I Annealed vs B522 Class I Hard: 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.
B522 Class I AnnealedB522 Class I Hard
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 34 GPa4.9 Msi · Bulk Modulus 150 GPa21.8 Msi · Poisson's Ratio 0.39
Physical
Density and transition temperatures.
Same in both: Density 16 g/cm³0.58 lb/in³ · Melting Point (Solidus) 1,005°C1,841 °F · Liquidus Temperature 1,050°C1,922 °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 150 J/kg·K0.04 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 15 µm/m·K8.3 µin/in·°F · Latent Heat of Fusion 80 J/g34.4 BTU/lb · Min Service Temperature -200°C-328 °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 98 / 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 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) 180,000 MJ/kg7.74×10⁷ BTU/lb · Embodied Carbon (primary production) 13,500 kg CO₂/kg · Embodied Water 250,000 L/kg29,957 gal/lb · Typical Recycled Content 80%
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.
B522 Class I Annealed vs B522 Class I Hard — frequently asked
Is B522 Class I Hard stronger than B522 Class I Annealed?
Yes. B522 Class I Hard has a typical yield strength of 700 MPa (102 ksi) against 180 MPa (26.1 ksi) for B522 Class I Annealed — about 3.9 times as much. Tensile strength is 800 MPa (116 ksi) vs 390 MPa (56.6 ksi).
Which condition does FabDigit quote by default, Annealed or Hard?
Annealed is the default B522 Class I 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, B522 Class I Annealed or B522 Class I Hard?
B522 Class I Hard, by a small margin. Both rate fair for machinability — 50/100 against 35/100 for B522 Class I Annealed.
Ready to make it?
Upload a CAD file and FabDigit prices the part in B522 Class I Annealed and B522 Class I Hard 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.