Se bobin fret la woule te fe nan bobin cho woule, ak pwosesis pwodiksyon li yo anjeneral pase nan pwosesis prensipal tankou preparasyon materyel anvan tout koreksyon, woule fret, tretman chale, nivo ak fini.
Konpozisyon chimik nan fret woule klou asye
| Asye Klas | C | Mesye | P | S | Al | |
| DC01 | SPCC | ≤0.12 | ≤0.60 | 0.045 | 0.045 | 0.020 |
| DC02 | SPCD | ≤0.10 | ≤0.45 | 0.035 | 0.035 | 0.020 |
| DC03 | ZEPOL | ≤0.08 | ≤0.40 | 0.030 | 0.030 | 0.020 |
| DC04 | SPCF | ≤0.06 | ≤0.35 | 0.025 | 0.025 | 0.015 |
