Chemical properties of stellite alloy:
There are several types and variants of stellite alloy. All types contain different numbers of the following different number of elements:
Most of these alloys contain four to six of these elements. Of all these elements, carbon and chromium are the most important. Therefore, both of them play the biggest role in the performance of the alloy.
Manufacturing process of Stellite Alloy 6 :
Stellite alloy is produced by a range of different processes or methods. These methods include forging or hot forging, hard surface deposition, powder metal, and finally casting. Processing and grinding are more difficult than steel. Therefore, high-performance processing equipment and special processing tools are required. Usually, it is machined by grinding instead of cutting.
Application of stellite alloy:
Typical applications include sawtooth, hardfacing and acid resistant machine parts. Stellite alloy is a major improvement in the production of valves for internal combustion engines, especially for poppet valves and valve seats. By reducing the erosion of hot gases, the spacing between the maintenance and re-grinding of the seats is significantly extended.
Although Stellite alloy is still the material of choice for certain internal parts of industrial process valves (seat surface hardening), it is discouraged in nuclear power plants. In the conduit that can be in communication with the reactor, a small amount of stellite alloy will be released into the process fluid and eventually into the reactor.
Stellite Alloy 12 was also used as the first cage material for commercial prosthetic heart valves, and the Starr-Edwards cage ball valve was first implanted in 1960.