This mod adds scrap iron and steel bars. Upgrade path= Wood>Scrap Iron>Iron>Steel. There is no downgrade path for them, so if they run out of hit points they will break and not turn back into the lower one like a lot of blocks do. Hit points are 300>1000>2500>6000.
The forum topic of the mod is here.
Credits: Elucidus
If you have any questions or have any problems/bugs, please use the support link (Discord, Forum Topic, GitHub Issues, etc.) in the post. If there is no support link in the post, please use the comments section.