6B Alloy is a cobalt-based alloy that exhibits excellent resistance to wear, corrosion, and abrasion. The wear resistance of 6B Alloy is a product of its chemical composition and not heat treatment or other hardening mechanisms. The low coefficient of friction of 6B Alloy enables it to resist seizing and galling, and It is beneficial in areas and applications where lubrication is difficult or impractical. 6B Alloy exhibits excellent resistance to cavitation erosion, even under sustained corrosive conditions. High-temperature exposure has little effect on this alloy’s hardness, impact strength, and dimensional stability. 6B Alloy also maintains hardness at elevated temperatures (approaching 1200°C) and will recover its original hardness upon cooling to room temperature. It can be used in many applications involving wear, corrosion, and elevated temperatures.
Alloy 6B is suitable for use in various wear and erosion applications. The abrasion resistance of UNS R30016 allows it to be used as industrial scraper blades and knives in the food processing, wastewater treatment, and textile industries. Alloy 6B is used in applications where erosion is an issue, such as nozzles, pumps, valves, and mixing blades that are moving slurries where cavitation damage is a concern. This alloy has also been used in industrial sliding wear applications such as valves in chemical processing and turbine blade components for steam control in the power industry. Alloy 6B can also be found in bearing assemblies in heat-treat furnaces.
Alloy 6B also has corrosion resistance in a variety of media and is wear-resistant. Chromium, molybdenum, tungsten and nickel all provide additional resistance against corrosion. Alloy 6B is very resistant to oxidation at ambient temperatures and has good resistance to oxidation at elevated temperatures. Alloy 6B resists different aqueous corrosive media at various concentration and temperature combinations. See the table on the next page for specifics.
The carbon content in alloy 6B may make it more difficult to machine compared to other cobalt based alloys, but tungsten carbide tools can still be used to machine this alloy. High-speed inserts are not recommended, but EDM techniques can be used to make threads in this alloy. Alloy 6B can be welded using various methods, including TIG, MIG, shielded metal arc and coated electrode welding. A preheat treatment to 1000°F should be used and maintained to prevent cracking during welding. Ventilation is needed to minimize exposure to airborne dust, fumes, and particulate matter when machining, grinding or welding this alloy. The standard heat treatment for alloy 6B is 2250°F (1232°C) followed by an air cool.
Stellite® 6B
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