| Gas composition, vol% | Different zones in blast furnace | Temp., ˚C | |||
| H2 | CO | CO2 | N2 | ||
| 8.1 | 45 | 0 | 55 | Cohesive zone | 1100 |
| 5.1 | 40 | 5 | 55 | Thermal reserve zone | 927 |
| 4.1 | 35 | 10 | 55 | Top zone | 700 |