C28500

C28500 is a lead-free material that, despite its absence of lead content, exhibits favorable machining characteristics due to its structural composition. Consequently, C28500 can serve as a cost-effective substitute for traditional lead-containing machining brass, especially in applications where stringent demands for mechanical properties and corrosion resistance are not essential.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu57.0059.00
Pb0.25
Fe0.35
Total Others0.90
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO ASTM B927 (AS PER TEMPER HO2)
Range (Inch) From To UTS Min (Ksi) PS Min (Ksi) Elongation Min (%) Hardness Min Hardness Max
Round (Dia) 0.059 0.500 69 43 8
0.500 1.000 65 36 12
1.000 2.953 59 26 16
Hexagon (A/F) 0.118 0.500 69 43 8
0.500 1.000 65 36 12
1.000 2.756 59 26 16
Square (A/F) 0.118 0.500 69 43 8
0.500 1.000 65 36 12
1.000 2.362 59 26 16
Rectangle (Thickness) 0.118 0.500 69 43 8
0.500 1.000 65 36 12
1.000 1.969 59 26 16
Range (mm) From To UTS Min (MPa) PS Min (MPa) Elongation Min (%) Hardness Min Hardness Max
Round (Dia) 1.5 12 480 300 8
12 25 450 250 12
25 75 410 180 18
Hex (A/F) 3 12 480 300 18
12 25 450 250 12
25 70 410 180 18
Square (A/F) 3 12 480 300 8
12 25 450 250 12
25 50 410 180 18
Rectangle (Thickness) 3 12 480 300 8
12 25 450 250 12
25 50 410 180 18
PHYSICAL PROPERTIES
Melting Point – Liquidus°F 1650
Melting Point – Solidus°F 1630
Densitylb/cu in. at 68°F 0.303
Specific Gravity 8.39
Electrical Conductivity% IACS at 68°F 29
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F 58
Coefficient of Thermal Expansion 68-21210⁻⁶ per °F (68 – 212°F) 11
Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) 121
Specific Heat CapacityBtu/ lb /°F at 68°F 0.09
Modulus of Elasticity in Tensionksi 12300
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 100
Machinability Rating 60

C28500

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