C31400

C31400 Leaded Commercial Bronze is a type of free-machining brass known for its exceptional electrical and thermal conductivity. This alloy also exhibits resistance to corrosion. Notably, it contains 2.00% lead, which imparts excellent free-cutting properties, making it well-suited for applications where ease of machining and good electrical and thermal conductivity are required.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu87.5090.50
Pb1.302.50
Fe0.10
Ni0.70
Total Others0.40
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO C31400 ASTMB140 (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 50 30 7
0.500 1.000 45 27 10
1.000 2.953 40 25 12
Hex (A/F) 0.118 0.500 50 30 7
0.500 1.000 45 27 10
1.000 2.756 40 25 12
Square (A/F) 0.118 2.362 40 25 12
Rectangle Thickness 0.118 1.000 40 25 12
Width 0.157 2.000
Thickness 1.000 1.968 40 25 12
Width 1.000 2.756
Range (mm) From To UTS Min (MPa) PS Min (MPa) Elongation Min (%) Hardness Min Hardness Max
Round (Dia) 1.5 12 345 205 7
12 25 310 185 10
25 75 275 170 12
Hex (A/F) 3 12 345 205 7
12 25 310 185 10
25 70 275 170 12
Square (A/F) 3 50 275 170 12
Rectangle Thickness 3 25 275 170 12
Width 4 50
Thickness 25 50 275 170 12
Width 50 70
PHYSICAL PROPERTIES
Melting Point – Liquidus°F 1900
Melting Point – Solidus°F 1850
Density lb/cu in. at 68°F 0.319
Specific Gravity 8.83
Electrical Conductivity% IACS at 68°F 42
Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F 104
Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) 10.2
Specific Heat Capacity Btu/ lb /°F at 68°F 0.09
Modulus of Elasticity in Tension ksi 17000
Modulus of Rigidity ksi 6400
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 Good
Capacity for Being Hot Formed Poor
Machinability Rating 80

C31400

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