Stainless steel types:
　    Stainless steel can be use, chemical composition and microstructure to the general classification. 
       To austenitic steel grade class from 18% Cr -8% nickel as a basic component, the elements of the different amount of change, and the development of steel for various uses.

Classification by chemical composition:
　　  1. CR Series: Series ferrite, martensite Series
  　    2. CR-NI Series: Austenite series, abnormal series, precipitation hardening series.
　　  3. Austenitic stainless steel
　　  4. Ferritic stainless steel
　　  5. Martensitic Stainless Steel
　     6. Duplex stainless steel
　      7. Precipitation hardening stainless steel