| The higher tungsten content of Stellite alloy 4 gives improved high temperature properties and an increase in abrasive wear resistance over Stellite alloy 6, but not as good as Stellite alloy 12 or 3. Adhesive wear is similar to Stellite alloy 6, but resistance improves as the load increases. Galling resistance is excellent. The alloy is brittle and withstands less impact than either Stellite alloy 6 or 12. This material is suitable for high temperature abrasion in corrosive environment. Stellite Alloy 4 has higher corrosion resistance than Stellite alloy 6 in oxidizing environments such as nitric and sulphuric acids. This improvement is due to the higher chromium content in the cobalt rich matrix making this material suitable for pump components. The alloy has excellent resistance to manganese dioxide, carbon particles and ammonium and zinc chlorides, used in the manufacturing of dry batteries. Corrosion resistance will vary depending on acid concentration, temperature, stress and contamination thus production exposure tests are recommended. This material does not respond to thermal treatments but may be stress relieved before and during machining by holding at 1650°F for 4 hours and slow cool. Applications involve corrosion and wear such as pump sleeves and impellors. For high temperature wear the material has been used for dies in hot pressing or extrusion of copper and aluminum. The modified alloy Stellite 4B resist abrasion and corrosion from manganese dioxide, carbon particles and ammonium and zinc chlorides used in the dry battery industry. Information provided by Deloro Stellite Inc. Product of former Deloro Stellite Inc. |
