C3771

C3771, classified as Section brass, stands as an easily extrudable alloy, combining alpha and beta phases with a modest introduction of aluminum, resulting in a distinct and vibrant golden hue. The presence of lead imparts free cutting attributes. C3771 is offered in the form of extruded rods and flats, commonly utilized in the domain of builder’s hardware.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu57.0061.00
Pb1.002.50
Sn+Fe1.00
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO H3250 JIS C3771 (AS PER TEMPER BD)
Range (mm) From To UTS Min (N/mm²) PS Min Elongation Min (%) Hardness Min Hardness Max
Round (Dia) 6 75 315 15
Hex (A/F) 6 70 315 15
Square (A/F) 6 60 315 15
Rectangle (Thickness) 6 50 315 15
PHYSICAL PROPERTIES
Physical Properties Metric English
Density 8.40 g/cc 0.303 lb/in3
CTE, linear 26.0 ᶙm/m-˚C 14.4 ᶙin/in-˚F
Specific Heat Capacity 0.380 J/g-˚C 0.0908 BTU/lb-˚F
Thermal Conductivity 113 W/m-K 784 BTU-in/hr-ft²-˚F
Melting Point 880-900 ˚C 1620 – 1650 ˚F
Solidus 880 ˚C 1620 ˚F
Liquidus 900 ˚C 1650˚F
FABRICATION PROPERTIES
Forming Suitability
Machinability (CuZn39Pb3 = 100 %) 95.00%
Capacity for Being Cold Worked Poor
Capacity for Being Hot Worked Excellent

C3771

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