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C87870 Cast BRASSES Copper-Silicon Alloys (Silicon Bronzes and Silicon Brasses) true true https://api.copper.org/alloys.xhtml/C87870
Chemical Composition
Elements
Cu(1) Pb Sn Zn Fe P Ni(2) Mn Si Zr
(1) Cu + Sum of Named Elements 99.5% min.
(2) Ni value includes Co.
Min (%) 75.0 .30 16.0 .05 2.7
Max (%) 79.0 .09 .7 23.0 .10 .20 .20 .10 3.5 .030
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).
As Sand Cast As Sand Cast M01 47.9 Min
58.0 Typ
 23.2 Min
29.0 Typ
 5 Min
 60 Typ
Permanent Mold Castings As Permanent Mold Cast M05 47.9 Min
58.0 Typ
 23.2 Min
30.5 Typ
 5 Min
 65 Typ
Physical Properties
Melting Point - Liquidus°F 1652
Melting Point - Solidus°F 1562
Densitylb/cu in. at 68°F 0.3
Specific Gravity 8.3
Electrical Conductivity% IACS at 68°F 8
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F 21.7
Coefficient of Thermal Expansion 68-21210 to -6 power per °F (68 – 212°F) 10.3
Coefficient of Thermal Expansion 68-39210 to -6 power per °F (68 – 392°F) 10.3
Coefficient of Thermal Expansion 68-57210 to -6 power per °F (68 – 572°F) 10.4
Specific Heat CapacityBtu/ lb /°F at 68°F 0.09
Modulus of Elasticity in Tensionksi 15200
Poisson's Ratio 0.33
Casting Characteristics

No casting characteristics for this alloy

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 Poor
Capacity for Being Hot Formed Excellent
Forgeability Rating 95
Machinability Rating 70
Common Fabrication Processes

No fabrication process properties for this alloy

Thermal Properties
Treatment Minimum* Maximum*
* Temperature is measured in Fahrenheit.
Annealing 932 1112
Typical uses
Product Category Product Reason Category Reason
Industrial Bolts
Nuts
Plumbing Lead-free defined as Calif. AB 1953 max. .25% lead content
Potable Water Components, Valves, Pump Components , Plumbing Fittings, Meter Cases
Applicable Specifications

No applicable specifications for this alloy

Corrosion Properties

No Corrosion Properties Available.