CW509L

CW509L is a lead-free material that’s suitable for machining thanks to its structural composition. It can be used as a cost-effective substitute for traditional lead-containing machining brass, especially in applications where stringent requirements for mechanical properties and corrosion resistance are not essential.

CHEMICAL COMPOSITION
Elements Min (%) Max (%)
Cu 59.00 61.50
Pb 0.20
Fe 0.20
Sn 0.20
Ni 0.30
Al 0.05
Total Others 0.20
Zn Remainder
MECHANICAL PROPERTIES ACCORDING TO EN12164 (AS PER TEMPER R410)
Range (mm) From To UTS Min (MPa) PS Min (MPa) Elongation Min (%) Hardness Min (HRB) Hardness Max (HRB)
Round (Dia) 2 40 410 230 10
Hex (A/F) 3 35 410 230 10
Square (A/F) 3 35 410 230 10
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

CW509L

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