CZ109

CZ109 is a lead-free material that is well-suited for machining due to its structural composition. It can serve as a cost-effective alternative to traditional lead-containing machining brass, particularly in situations where there are no stringent demands for mechanical properties and corrosion resistance.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu59.0062.00
Pb0.10
Total Others0.30
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO BS2874 (AS PER TEMPER M)
Range (mm) From To UTS Min (N/mm²) PS Min Elongation Min (%) Hardness Min Hardness Max
Round (Dia) 6 40 340 25
Hex (A/F) 6 40 340 25
Square (A/F) 6 40 340 25
Rectangle (Thickness) 6 40 340 25
PHYSICAL PROPERTIES
Melting Point – Liquidus°F 1660
Melting Point – Solidus°F 1650
Density lb/cu in. at 68°F 0.303
Specific Gravity 8.39
Electrical Conductivity % IACS at 68°F 28
Thermal Conductivity Btu/ 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 Capacity Btu/ lb /°F at 68°F 0.09
Modulus of Elasticity in Tension ksi 15000
Modulus of Rigidity ksi 5600
FABRICATION PROPERTIES 
Technique   Suitability
Soldering Excellent
Brazing Excellent
Oxyacetylene Welding Good
Gas Shielded Arc Welding Fair
Coated Metal Arc Welding Not Recommended
Spot Weld Good
Seam Weld Not Recommended
Butt Weld Good
Capacity for Being Cold Worked Fair
Capacity for Being Hot Formed Excellent
Forgeability Rating 90
Machinability Rating 40

CZ109

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