CZ121PB4

CZ121Pb4, classified as Free cutting brass, stands as a notably enhanced variation of 60/40 brass, acclaimed for its outstanding free cutting characteristics. Its application lies in the high-volume production of brass components necessitating utmost output and prolonged tool lifespan. This is particularly relevant in scenarios where no subsequent cold forming is needed following the machining process.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu56.5058.50
Pb3.504.50
Fe0.30
Total Others0.70
ZnRemainder

 

MECHANICAL PROPERTIES ACCORDING TO BS2874 (AS PER TEMPER M)
Range (mm) From To UTS Min (N/mm²) PS Min Elongation (%) Hardness Min Hardness Max
Round (Dia) 2 18 425 15
18 40 400 18
40 75 380 20
Hex (A/F) 3 18 425 15
18 40 400 18
40 70 380 20
Square (A/F) 3 18 425 15
18 40 400 18
40 60 380 20
Rectangle (Thickness) 3 18 425 15
18 40 400 18
40 50 380 20
PHYSICAL PROPERTIES
Melting Point – Liquidus°F 1630
Melting Point – Solidus°F 1610
Densitylb/cu in. at 68°F 0.306
Specific Gravity 8.47
Electrical Conductivity% IACS at 68°F 28
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F 71
Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) 11.6
Specific Heat CapacityBtu/ lb /°F at 68°F 0.09
Modulus of Elasticity in Tensionksi 14000
Modulus of Rigidityksi 5300
FABRICATION PROPERTIES
Technique Suitability
Soldering Excellent
Brazing Good
Oxyacetylene Welding Not Recommended
Gas Shielded Arc Welding Not Recommended
Coated Metal Arc Welding Not Recommended
Spot Weld Not Recommended
Seam Weld Not Recommended
Butt Weld Fair
Capacity for Being Cold Worked Poor
Capacity for Being Hot Formed Excellent
Machinability Rating 90

CZ121PB4

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