1.1573 | C135U (+AC)
| Numeric designation | 1.1573 |
|---|---|
| Chemical designation | C135U |
| State | soft annealed (+AC) |
| Etching | 3 % Nital |
The images show the unalloyed tool steel in a soft annealed condition. At low magnification, the “bright grains” initially look like pure ferrite, which cannot be present at all due to the C content. At high magnification, the molded-in cementite (spheroidite) in the ferritic matrix can also be seen here.
