By chemical structure of Stainless Steels; they are classified according to their usage areas and properties. This classification code differs by country. The most used norms in the world are “AISI - USA”, “EN - Europe” and “DIN - German” norms
AISI (AMERICAN IRON AND STEEL INSTITUTE): USA
EN (EUROPEAN NORMS): EUROPE
DIN (DEUTSCHES INSTITUT FUR NORMUNG): GERMANY
AFNOR (ASSOCIATION FRANCAISE DE NORMALISATION): FRANCE
BSI (BRITISH STANDARDS INSTITUTION): UK
JIS (JAPANESE INDUSTRIAL STANDARDS): JAPAN
UNI (ENTE NAZIONALE ITALIANO DI UNIFICAZIONE): ITALY
GOST (GOSUDARSTVENNYY STANDART): RUSSI