Stainless steel is among the many metals that are excellent investment casting alloys. Its specialized properties make it ideal for a variety of parts and applications that require a rust- and stain-resistant surface. Stainless steel combines iron and chromium, which is responsible for its non-reactive characteristic. There may also be a variety of other components, such as carbon, silicon, nitrogen, nickel and manganese. There are many stainless steel alloys that are formally recognized and an unlimited number of custom alloys. It should be noted that stainless steel is a complex alloy with characteristics that require specialized expertise and hands-on experience.