Copper Alloy BrAZh9-4 Cast-Sand vs BrAZh9-4-QT
Copper Alloy · BrAZh9-4 temper comparison
BrAZh9-4 Cast-Sand and BrAZh9-4-QT are two conditions of the same copper alloy grade, BrAZh9-4: Cast-Sand (as-cast in sand mould) versus QT (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. BrAZh9-4-QT is the stronger of the two: yield strength 400 MPa (58 ksi) against 180 MPa (26.1 ksi) for BrAZh9-4 Cast-Sand, about 122% more; tensile strength follows at 700 MPa (102 ksi) vs 450 MPa (65.3 ksi). In exchange, BrAZh9-4 Cast-Sand is the more ductile: elongation 15% versus 6% for BrAZh9-4-QT, and BrAZh9-4-QT is harder (200 HB vs 110 HB). BrAZh9-4 Cast-Sand conducts electricity better (13 % IACS vs 11 % IACS). On the shop floor, BrAZh9-4 Cast-Sand machines more easily (fair vs poor) and BrAZh9-4 Cast-Sand welds better (good vs fair).
BrAZh9-4 Cast-SandChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
BrAZh9-4-QTChoose it when strength drives the design.
BrAZh9-4 Cast-Sand vs BrAZh9-4-QT: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all copper alloy 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 copper alloy 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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Shear Modulus 41 GPa5.9 Msi · Bulk Modulus 115 GPa16.7 Msi · Poisson's Ratio 0.33 · Fracture Toughness (K_IC) 35 MPa·√m31.9 ksi·√in
Physical
Density and transition temperatures.
Same in both: Density 7.6 g/cm³0.27 lb/in³ · Melting Point (Solidus) 1,040°C1,904 °F · Liquidus Temperature 1,050°C1,922 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 16.2 µm/m·K9 µin/in·°F · Latent Heat of Fusion 210 J/g90.3 BTU/lb · Max Service Temperature (continuous) 300°C572 °F · Min Service Temperature -196°C-321 °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) -0.31 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 72 / 100 · Brazeability / Solderability 25 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 62 MJ/kg26,655 BTU/lb · Embodied Carbon (primary production) 3.9 kg CO₂/kg · Embodied Water 250 L/kg30 gal/lb · Typical Recycled Content 45%
Strength versus weight
Yield strength against density for every copper alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
BrAZh9-4 Cast-Sand vs BrAZh9-4-QT — frequently asked
Is BrAZh9-4-QT stronger than BrAZh9-4 Cast-Sand?
Yes. BrAZh9-4-QT has a typical yield strength of 400 MPa (58 ksi) against 180 MPa (26.1 ksi) for BrAZh9-4 Cast-Sand — about 122% more. Tensile strength is 700 MPa (102 ksi) vs 450 MPa (65.3 ksi).
Which condition does FabDigit quote by default, Cast-Sand or QT?
Cast-Sand is the default BrAZh9-4 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, BrAZh9-4 Cast-Sand or BrAZh9-4-QT?
BrAZh9-4 Cast-Sand. Its machinability rates fair (40/100) against poor (30/100) for BrAZh9-4-QT; for welding the order is BrAZh9-4 Cast-Sand first (good, 55/100) then BrAZh9-4-QT (fair, 35/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in BrAZh9-4 Cast-Sand and BrAZh9-4-QT 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.