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What are the Different Grades of Stainless Steel?

Answer

There are five different grades of stainless steel: Austenitic, Ferreitic, Duplex, Martensitic, and Precipitation Hardening. Martensitic grade stainless steel is most commonly used to make surgical instruments and knives. Ferritic grade stainless steel is most commonly used to make automotive exhausts and material handling equipment; this grade is magnetic.
1 Additional Answer
There are over 150 grades of stainless steel, separated into 5 main families. The families are austenitic steels (contains at least 16% chromium and 6% nickel) , duplex steels (23% chromium, 4% nickel and 22% chromium, 5% nickel ), precipitation hardening steels (17% chromium, 4% nickel, 4% copper and 0.3% niobium.), martensitic steels (lower chromium, about 12%), and ferritic steels (plain chromium 10.5 to 18%).
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