CZ121PB3

CZ121Pb3, categorized as Free cutting brass, stands as a notably enhanced iteration of 60/40 brass, renowned for its outstanding free cutting attributes. It is employed in the high-volume manufacture of brass components where achieving peak productivity and prolonged tool lifespan is imperative, and where there exists no subsequent necessity for cold forming after the machining process.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu56.5058.50
Pb2.503.50
Fe0.30
Total Others0.70
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO ASTM B455 (AS PER TEMPER M)
Range (mm) From To UTS Min (N/mm²) PS Min Elongation Min (%) Hardness Min Hardness Max
Round (Dia) 1.5 18 425 15
18 40 400 20
40 75 380 20
Hex (A/F) 3 18 425 15
18 40 400 20
40 70 380 20
Square (A/F) 3 18 425 15
18 40 400 20
40 60 380 20
Rectangle (Thickness) 4 18 425 15
18 40 400 20
40 50 350 25
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

CZ121PB3

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