Stainless Steel Castings
Stainless steel is a steel alloy with a minimum of 10.5% chromium content by mass.
Stainless steel castings do not readily corrode, rust or stain with water as ordinary steel does. However, it is not fully stain-proof in low-oxygen, high-salinity, or poor air-circulation environments. There are different grades and surface finishes of stainless steel to suit the environment the alloy must endure. Stainless steel castings are used where both the properties of steel and corrosion resistance are required.
Stainless steel castings differ from carbon steel castings by the amount of chromium present. Unprotected carbon steel rusts readily when exposed to air and moisture. This iron oxide film (the rust) is active and accelerates corrosion by forming more iron oxide; and, because of the greater volume of the iron oxide, this tends to flake and fall away. Stainless steels contain sufficient chromium to form a passive film of chromium oxide, which prevents further surface corrosion by blocking oxygen diffusion to the steel surface and blocks corrosion from spreading into the metal’s internal structure. Due to the similar size of the steel and oxide ions, they bond very strongly and remain attached to the surface. Stainless steel castings are used in many applications where corrosion resistance and also material strength are critical.
Passivation occurs only if the proportion of chromium is high enough and oxygen is present.
In castings, stainless steel is often used in applications where the part is likely to encounter a corrosive environment i.e. liquid or gas handling components. Stainless steel is used in castings across a variety of industries including hydro power, locomotive, pumps, valves, power generation, automotive, aviation, and many different types of industrial process equipment. Stainless steel castings can be particularly cost-effective as opposed to forgings or plate where significant post processing must occur.