Sponge iron produce from the direct reduction of iron ore (Direct Reduced Iron), iron ore is the pellet whose oxygen is removed during the direct reduction operation, without the need to melt the iron ore. In this method, the iron ore pellet is regenerated and the result is sponge iron (porous pellet) with Fe metallization (about 92 degrees). Sponge iron, after melting and regeneration in steelmaking, is used in the casting process in the form of required products and is used in three forms: slabs, billets, and rebars.
| Component | Total iron | Metallic iron | Metallization degree | Carbon | SiO2 | sulfur | Sizing |
| Amount (%) | 86-90 | 79-83 | 90-94 | 1.2-2 | 4 Max | Max 0.01 | 0-6.3mm :5 6.31-18mm:95 |
