Precious Metal B780 1/4H vs B780-ANN
Precious Metal · B780 temper comparison
B780 1/4H and B780-ANN are two conditions of the same precious metal grade, B780: 1/4H (quarter hard) versus ANN (annealed). The chemistry is identical, so every difference below comes from the condition. B780 1/4H is the stronger of the two: yield strength 300 MPa (43.5 ksi) against 125 MPa (18.1 ksi) for B780-ANN, about 140% more; tensile strength follows at 400 MPa (58 ksi) vs 310 MPa (45 ksi). In exchange, B780-ANN is the more ductile: elongation 30% versus 12% for B780 1/4H, and B780 1/4H is harder (110 HV vs 70 HV). B780-ANN runs hotter in service (250°C vs 190°C continuous).
B780 1/4HChoose it when strength drives the design.
B780-ANNChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
B780 1/4H vs B780-ANN: 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, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 88 GPa12.8 Msi · Shear Modulus 33 GPa4.8 Msi · Bulk Modulus 108 GPa15.7 Msi · Poisson's Ratio 0.37 · Reduction in Area 60% · Hardness, Brinell 68 HB
Physical
Density and transition temperatures.
Same in both: Density 10.05 g/cm³0.36 lb/in³ · Melting Point (Solidus) 779°C1,434 °F · Liquidus Temperature 795°C1,463 °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 245 J/kg·K0.06 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 18.5 µm/m·K10.3 µin/in·°F · Latent Heat of Fusion 105 J/g45.1 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 V · Corrosion Resistance 75 / 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 %) 45% · Weldability 60 / 100 · Castability 70 / 100 · Brazeability / Solderability 90 / 100 · Polishability 90 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 1,200 MJ/kg515,908 BTU/lb · Embodied Carbon (primary production) 95 kg CO₂/kg · Embodied Water 2,500 L/kg300 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.
B780 1/4H vs B780-ANN — frequently asked
Is B780 1/4H stronger than B780-ANN?
Yes. B780 1/4H has a typical yield strength of 300 MPa (43.5 ksi) against 125 MPa (18.1 ksi) for B780-ANN — about 140% more. Tensile strength is 400 MPa (58 ksi) vs 310 MPa (45 ksi).
Which condition does FabDigit quote by default, 1/4H or ANN?
ANN is the default B780 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, B780 1/4H or B780-ANN?
B780 1/4H. Its machinability rates good (58/100) against fair (50/100) for B780-ANN.
Ready to make it?
Upload a CAD file and FabDigit prices the part in B780 1/4H and B780-ANN 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.