Chemical composition
| elemento | min% | max% | |
|---|---|---|---|
| C | 2,9 | 3,65 | |
| Mn | 0,5 | 0,7 | |
| P | 0,3 | ||
| Si | 1,8 | 2,9 | |
| S | 0,1 | ||
| Cu | |||
Comparative chart
international standards
| Nazione | Standard |
| Australia | T-250 |
| Europe | GG-25 |
| Germany | GG -25 |
| Frence | FGL250 |
| Great Britan | Gr 260 |
| Hunghery | ov 250 |
| Italy | G25 |
| Polond | ZI 250 |
| Rumania | FC 250 |
| Japan | FC 25 |
| Russia | SC 25 |
| Spain | FG 25 |
| Sveden | SSOI 25-00 |
| China | HT 550 |
| USA | Class 25 |