Stainless steel is one of the most durable metals in use today. Its mechanical properties are especially prized for resisting corrosion over the long term. However, different types of stainless steel have varying levels of corrosion resistance as well as particular applications for which they are best suited. Here we’ll discuss the compositions of three different stainless steel varieties: martensitic, ferritic, and austenitic. We’ll also discuss the main factors that might cause stainless steel to corrode.