Alloy 25 (C17200)

Alloy 25 (C17200) is a high-strength beryllium copper alloy.

Utilised in applications requiring good strength and fatigue resistance, Alloy 25 (C17200) is a beryllium-copper alloy which offers a broad range of attractive performance characteristics.

Introduction:

Benefits include good conductivity and corrosion resistance. This high-performance material is non-magnetic, and these qualities are unaffected by machining and surface abrasion. Once fully heat-treated, no additional treatments are required. The product offers the highest strength of any copper alloy combined with electrical conductivity, which is considerably improved compared to other high-strength copper alloys. Machinability, brazing and electro-discharge machining are all rated as good. The weldability of the alloy is good to fair.

Galling & Wear Resistance:

The galling resistance of the alloy under high load conditions is excellent. Galling resistance, high hardness and low friction performance result in excellent wear resistance in components such as bearings and bushes under conditions with marginal lubrication.

Corrosion Resistance:

The product's corrosion resistance is similar to pure copper; this includes resistance to saltwater environments, non-oxidising acids, dilute alkalis and most organic solutions. The material is stress corrosion resistant in chloride and sulphide solutions and is not subject to hydrogen embrittlement.

Use in Intake Valves:

Alloy 25 finds use in producing seat inserts for titanium valves used in racing engines. The high copper content combines superior strength with impressive heat transfer qualities. The combination helps promote the intake valve's life expectancy while affording the strength to withstand forces during operation.