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C31400 Leaded Commercial Bronze


C31400 Leaded Commercial Bronze is a free machining brass with excellent electrical and thermal conductivity. The alloy is resistant to corrosion and contains 2% lead to impart free-cutting characteristics.


Typical Applications

Builders Hardware

Door Knobs

Electrical

Electrical Plug Type Connectors, Connectors for Wire and Cable

Fasteners

Nuts, Screws

Industrial

Pickling Crates, Pickling Fixtures, Pickling Racks, Screw Machine Parts


Chemical Composition

Cu%Pb%Zn%Fe%Ni%P%
87.50-90.501.30-2.50Rem.0.100.70N/A

Mechanical Properties

Mechanical - H02 Half Hard Temper: 1/2" Dia. and Under
Tensile Strength, min50 ksi345 MPa
Yield Strength @ .5% ext under load min30 ksi205 MPa
Elongation in 2 in. or 50 mm min, %7
Brinell HardnessN/A
Machinability Rating80%
Mechanical - H02 Half Hard Temper: Over 1/2" Dia. to 1" Incl.
Tensile Strength, min45 ksi310 MPa
Yield Strength @ .5% ext under load min27 ksi185 MPa
Elongation in 2 in. or 50 mm min, %10
Brinell Hardness, minN/A
Machinability Rating80%
Mechanical - H02 Half Hard Temper: Over 1" Dia.
Tensile Strength, min40 ksi275 MPa
Yield Strength @ .5% ext under load min25 ksi170
Elongation in 2 in. or 50 mm min, %12
Brinell Hardness, minN/A
Machinability Rating80 %
Mechanical - H04 Hard Temper: 2" Dia. and Under
Tensile Strength, min53 ksi365 MPa
Yield Strength @ .5% ext under load min40 ksi275 MPa
Elongation in 2 in. or 50 mm min, %6
Brinell Hardness, minN/A
Machinability Rating80 %

Physical Properties

 US CustomaryMetric
Melting Point-Liquidus1900 °F
1038 °C
Melting Point-Solidus1850 °F
1010 °C
Density0.319 lb/in 3
@ 68 °F
8.83 gm/cm 3
@ 20 °C
Specific Gravity8.838.83
Electrical Resistivity24.70 ohms-cmil/ft
@ 68 °F
4.11 microhm-cm
@ 20 °C
Electrical Conductivity42% IACS
@ 68 °F
0.246 MegaSiemens/cm
@ 20 °C
Thermal Conductivity104 Btu/sq ft/ft hr/°F
@ 68 °F
180 W/m
@ 20 °C
Coefficient of
Thermal Expansion
10.2  ⋅ 10-6 per °F
(68-572 °F)
17.6 ⋅ 10-6 per °C
(20-300 °C)
Specific Heat Capacity0.09 Btu/lb/°F
@ 68 °F
377.1 J/kg
@293 °C
Modulus of Elasticity
in Tension
17000 ksi117212 MPa
Magnetic Permeability6400 ksi44127 MPa

Fabrication Properties

Joining TechniqueSuitability
SolderingExcellent
BrazingGood
Oxyacetylene WeldingNot Recommended
Gas Shielded Arc WeldingNot Recommended
Coated Metal Arc WeldingNot Recommended
Spot WeldNot Recommended
Seam WeldNot Recommended
Butt WeldFair
Capacity for being Cold WorkedGood
Capacity for being Hot WorkedPoor

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