A.Grain size
The average grain size rating of metals– ASTM E112
Black and white area and grain size rating–BW 2003-01
B.Microstructure
1.Austenite
2.Ferrite
3.Carbide
4.Pearlite
5.Upper bainite
6.Lower bainite
7.Granular bainite
C. Martensite
8.Martensitic
