ThePipingMart Blog Grades C65500 High Silicon Bronze – Composition, Properties, and Uses

C65500 High Silicon Bronze – Composition, Properties, and Uses

UNS C65500

UNS C65500 is a wrought copper-nickel-silicon alloy that offers excellent resistance to corrosion and wear, making it an ideal choice for various applications. Its unique composition and properties make UNS C65500 stand out from other alloys, making it a popular choice in many industries. In this blog post, we will explore the composition, properties, and uses of UNS C65500 in detail.

C65500 Composition

The UNS C65500 alloy consists of copper, nickel, and silicon as its primary alloying elements. Copper forms the base of the alloy, providing it with excellent thermal and electrical conductivity. On the other hand, nickel improves the alloy’s strength, durability, and corrosion resistance, while silicon increases its hardness and wear resistance.

Min/Max Rem 0.8 0.05 0.50 – 1.3 0.6 2.8 – 3.8 1.5
Nominals 97.0000 0.9000 3.0000

C65500 Mechanical Properties

UNS C65500 is a challenging and robust alloy with moderate to excellent roiled spring wire production. Rating The alloy showcases high tensile strength, with a minimum value of 620 MPa (90 ksi). Its elongation is 20% or more and boasts a hardness rating of 110 Vickers.

C65500 Physical Properties

This alloy has a density of 8.94 g/cm3, making it denser than aluminium but less dense than steel. The melting point of UNS C65500 is approximately 1085°C (1985°F), with a thermal conductivity rating of around 40W/m°C.

Coefficient of Thermal Expansion 10.0 . 10-6 per oF (68-212 F) 18.0 . 10-6 per oC (20-100 C)
Density 0.308 lb/in3 at 68 F 8.53 gm/cm3 @ 20 C
Electrical Conductivity 7 %IACS @ 68 F 0.041 MegaSiemens/cm @ 20 C
Electrical Resistivity 148.0 ohms-cmil/ft @ 68 F 24.6 microhm-cm @ 20 C
Melting Point – Liquidus 1880 F 1027 C
Melting Point – Solidus 1780 F 971 C
Modulas of Elasticity in Tension 15000 ksi 103400 MPa
Modulus of Rigidity 5600 ksi 38610 MPa
Specific Gravity 8.53 8.53
Specific Heat Capacity 0.09 Btu/lb/oF at 68 F 377.1 J/kg . oK at 293 K
Thermal Conductivity 21.0.0 Btu . ft/(hr . ft2 . oF)at 68F 36.3 W/m . oK at 20 C

C65500 Uses

UNS C65500 is used in many industrial applications due to its excellent mechanical and physical properties. Many companies use the alloy in marine applications due to its excellent corrosion resistance, making it perfect for tubing, condenser tubes, and heat exchangers. It also manufactures electrical components and severe-duty valves, offering low magnetic permeability and excellent wear resistance.

C65500 Corrosion Resistance

UNS C65500 offers excellent corrosion resistance to seawater, halogen gases, and brine solutions, making it more sturdy than other alloys in seawater applications. Its corrosion resistance capabilities make it an ideal material for marine engineering and naval applications, as it exhibits excellent resistance to biofouling and seawater-induced corrosion.

C65500 Heat Treatment

UNS C65500 is primarily supplied in an annealed or as-fabricated condition. However, it can be hardened by ageing at low temperatures between 150°C (302°F) and 350°C (662°F).

C65500 Machining

UNS C65500 is an easily machinable and formable alloy. It can be machined with ease when annealed. Its physical properties do not diminish during machining.

C65500 Welding

This alloy is weldable by several types of welding, including brazing, soldering and resistance welding. When welding, oxyacetylene and gas tungsten arc welding processes are generally preferred.


UNS C65500 is a unique alloy with excellent mechanical and physical properties and superior corrosion resistance. Its applications are widely spread across various industries, from marine engineering and electrical manufacturing to severe-duty valve manufacturing. The alloy’s unique properties make it easy for machining, heat treatment and welding, providing ease to industrial production. From here, you can confidently decide whether UNS C65500 is a suitable alloy for your project.

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