COPPER & COPPER ALLOY PRODUCTS
WROUGHT COPPER BRASS & BRONZE
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FINISHED MACHINE PARTS
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Copper Alloy No. C67300

Manganese Silicon Bronze , CDA 673

Chemical Composition % by weight

Element Nominal Minimum Maximum
Copper 60.5 58 63
Lead 1.7 .40 3
Iron - - .50
Tin - - .30
Zinc Remainder
Nickel (incl. Co) - - .25
Aluminum - - .25
Manganese 2.75 2 3.5
Silicon 1 .5 1.5

Applications

Hydraulic piston shoes, cylinder liners, cams.

Common Fabrication Processes

Machining 

Mechanical Properties

Typical for 2" Bar As Extruded Temper

Hardness* Rockwell B Scales 78
Tensile Strength** KSI 75
Yield Strength** (.5% EAU) KSI 36
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) 58
Specific Heat BTU/lb/F @ 68F .09
Thermal Expansion Per F from 68 F to 572 F .000011
Density lb/cu in @ 68 F .293
Electrical Conductivity* (Annealed) % IACS @ 68 F 23
Modulus of Elasticity (Tension) KSI 16,000

*Volume basis

Fabrication Properties

Capacity for being cold worked Fair
Suitability for being joined by: Soldering/Good
Brazing/Not Recommended
Oxyacetylene Welding/Not Recommended
Gas Shielded Arc Welding/Fair
Coated Metal Arc Welding/Not Recommended
Resistance Welding Spot/Good
Seam/Good
Butt/Good

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.