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Copper Alloy No. C64200

Silicon Aluminum Bronze, ASTM B150 CDA 642

Chemical Composition % by weight

Element Nominal Minimum Maximum
Copper 91.2 Rem. Rem.
Lead - - .05
Iron - - .30
Tin - - .20
Zinc - - .50
Aluminum 7 6.3 7.6
Manganese - - .10
Silicon 1.8 1.5 2.2
Nickel (incl. Co) - - .25
Arsenic - - .15

Applications

Valve stems, gears, marine hardware, pole line hardware, bolts, nuts, valve bodies and components.

Common Fabrication Processes

Hot forming, forging, machining.

Mechanical Properties

Typical for 1-1/2" Rod Hard (10%) Temper

Hardness* Rockwell B Scales 90
Tensile Strength** KSI 93
Yield Strength** (.5% EAU) KSI 60
Elongation** % in 2 inch 26

**Test values are nominal approximations and depend on specimen size and orientation.

Physical Properties

Thermal Conductivity BTU/ (sq ft-ft-hr-F) 26
Specific Heat BTU/lb/F @ 68F .09
Thermal Expansion Per F from 68 F to 572 F .0000100
Density lb/cu in @ 68 F .278
Electrical Conductivity* (Annealed) % IACS @ 68 F 8
Modulus of Elasticity (Tension) KSI 16,000

*Volume basis

Fabrication Properties

Capacity for being cold worked Poor
Capacity for being hot formed Excellent
Hot forgeability rating (forging brass =100) 80
Suitability for being joined by: Soldering/Not Recommended
Brazing/Fair
Oxyacetylene Welding/Not Recommended
Gas Shielded Arc Welding/Fair
Coated Metal Arc Welding/Fair
Resistance Welding Spot/Fair
Seam/Fair
Butt/Fair

The values listed above represent reasonable approximations suitable for general engineering use. Due to commercial variations in composition and to manufacturing limitations, they should not be used for specification purposes. See applicable A.S.T.M. specification references.