C655

Silicon Bronze Sheet

C65500

Overview

C65500 is a high-strength silicon bronze with excellent corrosion resistance — comparable to copper — combined with the strength of mild steel. It is the premier alloy for marine hardware, fasteners, and architectural applications. C655 contains approximately 3% silicon and 1% manganese, giving it 97 ksi tensile strength (cold-worked), outstanding weldability, and a beautiful golden appearance that weathers naturally.

Chemical Composition

Element	Min	Max
Copper (Cu)	Balance (~95.5%)	—
Silicon (Si)	2.80%	3.80%
Manganese (Mn)	0.50%	1.30%

Alloy Designations

UNSC65500

ASTMB98, B99

Common NameHigh-Silicon Bronze A

Mechanical Properties

Tensile Strength (H04 Hard)97 ksi (669 MPa)

Yield Strength (H04)72 ksi (496 MPa)

Elongation (H04)5%

Hardness (H04)95 HRB

Physical Properties

Density8.53 g/cm³ (0.308 lb/in³)

Melting Point971–1,027°C (1,780–1,880°F)

Electrical Conductivity7% IACS

Thermal Conductivity36.2 W/m·K

Typical Applications

Marine hardware and fasteners
Bolts, screws, and nuts
Architectural hardware and statuary
Pole line hardware
Hydraulic pressure lines
Pump rods and shafts

Fabrication & Joining

Excellent weldability — all methods
Good cold and hot formability
Soldering: Good
Brazing: Good
Fair machinability — use carbide tools
Beautiful golden finish, weathers naturally

Need C655 Bronze Sheet?

Contact our sales engineers for a custom quote on C655 (C65500) bronze sheet — tailored dimensions, tempers, and finishing options for your exact specifications.

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