some question about steel

since i cant amout to 143 s&e, so i cant unlock the steel furnace yet, can someone explain how it work?
1 how many materiel needed to build one ?
2 how many wrought bar can put into and how to make steel?
3 how long will a steel bar been made from it?
1 how many materiel needed to build one ?
2 how many wrought bar can put into and how to make steel?
3 how long will a steel bar been made from it?