C28000

C28000 is a lead-free material that’s well-suited for machining due to its structural composition. It can serve as a cost-effective alternative to traditional lead-containing machining brass, provided that it doesn’t need to meet stringent requirements for mechanical properties and corrosion resistance.

CHEMICAL COMPOSITION
Elements Min (%) Max (%)
Cu 59.00 63.00
Pb 0.09
Fe 0.07
Total Others 0.30
Zn Remainder
(1) Cu + Sum of Named Elements 99.7% min.
MECHANICAL PROPERTIES ACCORDING TO ASTM B36 (AS PER TEMPER HO2)
Range (Inch) From To UTS Min (ksi) UTS Max (ksi) PS Min Elongation Min (%) Hardness Min (HRB) Hardness Max (HRB)
Round (Dia) 0.059 2.953 58 70 52 80
Hex (A/F) 0.118 2.756 58 70 52 80
Square (A/F) 0.118 2.362 58 70 52 80
Range (mm) From To UTS Min (MPa) UTS Max (MPa) PS Min Elongation Min (%) Hardness Min (HRB) Hardness Max (HRB)
Round (Dia) 1.5 75 400 485 52 80
Hex (A/F) 3 70 400 485 52 80
Square (A/F) 3 60 400 485 52 80
PHYSICAL PROPERTIES
Melting Point – Liquidus°F 1660
Melting Point – Solidus°F 1650
Density lb/cu in. at 68°F 0.303
8.39 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

C28000

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