Stainless steel is a group of iron-based alloys. It contains approximately 11% chromium in a composition. Chromium prevents the iron from rusting and also provides heat-resistant properties. Different types of stainless steel include the elements Carbon (from 0.03% to greater than 1.00%). Nitrogen, Aluminum Silicon Sulfur Titanium Nickel Copper Selenium Niobium Molybdenum.