No. 5. Steel with .3 Per Cent Carbon
No. 22c. Steel with .5 Per Cent Carbon
(Magnification 60 Diameters.)
Now as we go still farther on up in percentage of carbon content, i.e. (beyond .86%, we have a white constituent beginning to appear as cell walls around the grains of the pearlite and this increases with increase of carbon until, with alloys having carbon around 3%, we have a proportionately small amount of pearlite while the white areas have so increased that it appears that the more or less round patches of pearlite float in a lake of white. This white which appears first as cell walls, and later in greater and greater quantity is free cementite.)
No. 23g. Steel with .9 Per Cent Carbon
No. 24a. Steel with 1.25 Per Cent Carbon
