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  • Alloy
642

Bronze 642 (Silicon Aluminum Bronze) Product Guide


Applications | Specifications | Mechanical and Chemical Data | Tolerances


Overview

The bronze alloy of choice when you require a strength and excellent corrosion resistance, but also an ease of machinability. 642 bronze has the highest machinability of any non-leaded bronze, it is also one of the lightest bronzes. Additionally, 642 bronze exhibits good fatigue and anti-galling strengths. Brazing is rated as fair, as are most forms of welding. Soldering and oxyacetylene welding are not recommended. This material is typically used to make bolts, gears, and valves.

 

Common Trade Names

UNS C64200, CDA 642, C642

Other Resources

Weight Calculator | Mill Test Reports

Products

Purchase Bronze 642 Round Bar

Applications

  • Gears
  • Valves

Specifications

ASTM

B150



Physical Properties 642
 
-HR50
Density 0.278 lb/in3
Ultimate Tensile Strength 82.6 ksi
Yield Tensile Strength 41.8 ksi
Shear Strength 56 ksi
Shear Modulus 6,100 ksi
Hardness Rockwell | Brinell B87 | 172
Elongation at Break Percentage 12%
Modulus of Elasticity 16,000 ksi
Poisson's Ratio 0.34
Machinability Percentage 60%
Melting Point 1,800-1,840 °F
Specific Heat 9.08 x 10^-2 BTU/lb-°F
Thermal Conductivity 312 BTU-in/hr-ft^2-°F
Electrical Conductivity 8% IACS


Chemistry Information
Element
Percentage
Si 1.5 - 2.2
Al 6.3 - 7.6
Cu 88.2 - 92.2
Zn 0 - 0.5
Fe 0 - 0.3
Ni 0 - 0.25
Sn 0 - 0.2
As 0 - 0.15
Mn 0 - 0.1
Pb 0 - 0.05
Residual 0 - 0.5
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