Stainless steel refers to a variety of steel based alloys that mix in chrome, nickel, and sometimes molybdenum or titanium. These alloys are resistant to oxidation into rust and also resistant to heat or chemical reaction. It is used in industrial environments where this functionality is needed. The most common types of stainless are 304, 316, and 400. There are many other grades of stainless and as a result it is more complex scrap metal to purchase. Speedie Recycling buys all varieties of stainless.