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C69240 Wrought BRONZES Other Copper-Zinc Alloys true false https://api.copper.org/alloys.xhtml/C69240
Chemical Composition
Elements
Cu(1) Pb Sn Zn Fe P Ni(2) Mn Si
(1) Cu + Sum of Named Elements 99.5% min.
(2) Ni value includes Co.
Min (%) 71.0 0.06 0.10 0.6 1.8
Max (%) 72.5 0.25 0.30 Rem 0.20 0.12 0.50 1.2 2.2
Mechanical Properties *
Form Temper Temper Code Tensile Strength
(ksi)		 YS-0.2% Offset
(ksi)		 Elongation
(%)		 Rockwell B scale
* Measured at room temperature, 68°F (20°C).
Bar 1/2 Hard H02 83.0 Typ
 50.0 Typ
 25 Typ
 70 Typ
1/2 Hard and Stress Relieved HR02 75.0 Typ
 54.0 Typ
 29 Typ
 70 Typ
Extruded and Drawn H50 83.0 Typ
 46.0 Typ
 21 Typ
 70 Typ
Rod 1/2 Hard H02 77.0 Typ
 45.0 Typ
 21 Typ
 90 Typ
Physical Properties
Melting Point - Liquidus°F 1610
Melting Point - Solidus°F 1598
Densitylb/cu in. at 68°F 0.301
Specific Gravity 8.33
Electrical Conductivity% IACS at 68°F 9
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F 18
Coefficient of Thermal Expansion 68-57210 to -6 power per °F (68 – 572°F) 10.4
Modulus of Elasticity in Tensionksi 15000
Poisson's Ratio 0.32
Fabrication Properties
Technique Suitability
Soldering Excellent
Brazing Good
Oxyacetylene Welding Good
Gas Shielded Arc Welding Good
Coated Metal Arc Welding Good
Spot Weld Good
Seam Weld Good
Butt Weld Good
Capacity for Being Cold Worked Good
Capacity for Being Hot Formed Excellent
Forgeability Rating 95
Machinability Rating 75
Common Fabrication Processes

No fabrication process properties for this alloy

Thermal Properties

No thermal properties for this alloy

Typical Uses

No information for this alloy

Applicable Specifications
Form Specific Sub-Form Application System Standard Description
Rod ASTM B371/B371M COPPER-ZINC-SILICON ALLOY ROD
Rod, Bar & Shapes Forgings ASTM B124/B124M COPPER AND COPPER-ALLOY FORGING ROD, BAR AND SHAPES
Corrosion Properties

No Corrosion Properties Available.