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C642

# Silicon Aluminum Bronze

C64200

## Overview

C64200 is a silicon aluminum bronze offering high strength (tensile strengths up to 95 ksi), excellent wear resistance, and superior corrosion resistance in aggressive environments. It combines the corrosion resistance of silicon bronze with the strength and wear properties of aluminum bronze. C642 is widely used for valve stems, gears, and components requiring high strength with corrosion resistance in marine and industrial chemical environments.

### Chemical Composition

Element

Min

Max

Copper (Cu)

Balance (~91%)

—

Aluminum (Al)

6.30%

7.60%

Silicon (Si)

1.50%

2.20%

### Alloy Designations

UNS C64200 

AMS 4634 

ASTM B150 

Type Silicon Aluminum Bronze 

### Mechanical Properties

Tensile Strength 75–95 ksi (517–655 MPa) 

Yield Strength 35–55 ksi (241–379 MPa) 

Elongation 15% 

Hardness 85 HRB 

### Physical Properties

Density 7.70 g/cm³ (0.278 lb/in³) 

Melting Point 982–1,027°C (1,800–1,880°F) 

Electrical Conductivity 7% IACS 

Thermal Conductivity 33.5 W/m·K 

## Typical Applications

-   Valve stems and valve components
-   Gears and pinions
-   Pump shafts
-   Marine hardware
-   Aerospace structural components
-   Corrosion-resistant fasteners

## Fabrication & Joining

-   Good machinability with carbide tooling
-   Hot forging: Good
-   Weldable with proper filler metal
-   Excellent corrosion resistance
-   Available in bar, rod, and forgings

## Need C642 Bronze ?

Contact our sales engineers for a custom quote on C642 (C64200) bronze — tailored dimensions, tempers, and finishing options for your exact specifications.

[Request a Quote](/contact)

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