Stainless steel, alsoknown ascorrosion-resistant steel, is aniron-based steel alloy, containingminimum 11%chromium. Chromium present in itprevents it from getting corroded,by forming aself-healing film of chromiumoxide on the surface of stainless steel.Apartfrom being corrosion resistant,it is also known for its qualities ofhighductility, weldability and cryogenictoughness. Stainless steel is gradedbytaking into consideration theenvironment that it will be assigned to.Thegrading system that is mostcommonly used for grading stainless steel is theSAESteel Grades, designatedby the Society of Automotive Engineers (SAE), andtheUNS grades.
Stainless steel grades are iron alloysthat contain more than 10.5% ofchromium. Other alloys are added to stainlesssteel to amplify its properties.The grading is based on the metallurgicalstructure and nature of stainlesssteel. The grades of stainless steel arecategorized into different families onthe basis of the properties that theydisplay.