Stellite 6

Stellite Alloys are a family of Cobalt- Chromium ‘super alloys’ consisting of complex carbides. They are completely non-magnetic and offer a high level of wear resistance and are particularly effective in providing chemical resistance.

Stellite Alloys are used as a base material, but the disadvantages of this are the high cost of the material and machining. As such it has been adopted as a welding material, but this process is unsuitable for components that might encounter Thermal Distortion and as such HVOF has been developed as a way of getting the properties of Stellite without the cost.

The main advantages with HVOF applied Stellite 6 coatings are that the process does not change the properties of the base material, which may occur during welding. The process can also be carried out on a wider range of base materials and is more precise in nature. At B&B we are able to effectively coat half inch Ball Valves with Stellite 6 coating.

Hardness

Stellite as a metal is that is extremely hard, this makes it difficult to machine which increases lead times and cost. Using the HVOF process we are able to give a components that attributes of Stellite 6 without this cost.

Corrosion Resistance

Stellite 6 provides an excellent corrosion resistance. This is down to the inherent characteristics of the hard carbide phase dispersed in a CoCr alloy matrix, which allows Stellite 6 coatings to keep their corrosion resistance properties even at high temperatures. Similar to stainless steels, Stellite 6 corrodes primarily through a pitting mechanism and not by general mass loss in seawater and chloride solutions.

Wear Resistance

Stellite 6 is the industry standard for a lot of general purpose wear resistance. This includes many forms of mechanical degradation. Stellite 6 Coatings will keep a high level of hardness up to 500°C. Stellite 6 will also have a good resistance to impact and cavitation erosion.

Welding Alternative

Components are often hardfaced with Stellite through a welding process. The disadvantage of this process is that the Stellite layer will often crack when there is a change in temperature, which will not occur with sprayed Stellite. HVOF can also be performed without fear of thermal distortion.

Applications

Stellite 6 has a wide range of applications but is most popular with our valve customers, where it is often employed as a replacement for Electroless Nickel Plating where the same levels of hardness and corrosion resistance cannot be achieved. It’s also used in a variety of moving parts for machines.

Complete Supply of Valve Components
Options for High Temperature Environments
Protection of Pump Components
REACH impacts of Hexavalent Chromium
confusing brand names for coating
HVOF Coatings overview

Company Registration Number: 03639121

VAT Number: 721236968

DUNS Number: 236438573

ISO Certificate: 8512-ISO 9001:2015

Tel: (01484) 866386

Fax: (01484) 866300

Email: mail@bandbprecision.co.uk

B&B Precision Engineering Huddersfield
Dearne Park Estate, Park Mill Way
Clayton West, West Yorkshire, HD8 9XJ

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