Stainless steel consists of 400 series(Fe-Cr series) and 300 series(Fe-Cr-Ni series).
Ferrite series, Martensite series, Austenite series, Anomaly series
-Body centered cubic(BBC)
-Heat treatment cant harden ferrite series.
-Representative steel : STS430
-Ferromagnetism at normal temperature
-Martensite series has low corrosion resistance and high strength.
-It is generated from austenite structure by transformation of martensite
caused by cooling.
-Representative steel : STS410
-Face centered cubic(FCC)
-Heat treatment cant harden austenite series, while processing can harden.
-Non magnetic(magnetic after processing)
-Representative steel : STS304
-Steel which has improved hardness by precipitating metal compound, such
as Cu, Al, Nb, using seasoning after heat treatment
-Representative steel : STS630