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Grade: Grade 200
Formula: Cu 70/Zn 30
Form: Ball/Sphere
Material: Copper/Zinc (Brass)
Commodity: Alloys
Type: Precision Sphere
Sphericity: 5.08µm

Grade 200 Brass Balls (Cu70/Zn30)

Grade 200 Brass Balls (Cu70/Zn30) are characterized by their excellent machinability, good strength, and moderate corrosion resistance, making them highly versatile for precision engineering applications. The 70/30 copper-zinc composition provides a balance of toughness and ductility, while maintaining stability in a range of mechanical and thermal conditions. These brass balls find use across aerospace, marine, automotive, and instrumentation industries, where durability and resistance to wear are required. Specific applications include precision bearings, valve components for marine systems, and mechanical parts in defense and automotive engineering. In research, Cu70/Zn30 brass serves as a model alloy for studying dezincification, corrosion resistance, and microstructural optimization under varied thermal treatments, helping improve alloy performance for extreme environments. The combination of machinability, durability, and reliability ensures that these brass balls remain a valuable material in both cutting-edge scientific investigations and demanding industrial operations.
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Tolerances

Ball/Sphere
Diameter Standard ±5%
Diameter Precision See Item

Material Properties for Alloys

Mechanical Properties
Element Value
Hardness - Brinell 65-160
Elongation at break( % ) 65
Modulus of elasticity( GPa ) 100-115
Izod impact strength( J m⁻¹ ) 50-90
Shear strength( MPa ) 200-400
Tensile strength( MPa ) 300-700
Electrical Properties
Element Value
Electrical resistivity( µOhmcm ) 6.2-7.8
Temperature coefficient( K⁻¹ ) 0.0012-0.0016
Thermal Properties
Element Value
Melting point( C ) 910-965
Thermal conductivity( W m⁻¹ K⁻¹ ) 109-121@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 19-20@20-100°C
Physical Properties
Element Value
Density( gcm⁻³ ) 8.55

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