Scraps can also be found in treasure chests in dungeons and abandoned mineshafts.
In Blast Furnace 9 steel scraps are smelted into 1 steel ingot.
Various machine parts like gears, shafts, panels, etc. can be recycled into scraps.
|Steel 2:1 Gearbox||48|
|Steel 4:1 Gearbox||114|
|Steel 8:1 Gearbox||180|
|Steel 16:1 Gearbox||244|
From destroyed machines
Some machines, that have risk of violent failure (some engines, shafts, etc.) drop random number of scraps after exploding.
Scraps have chance of appearing in dungeons, abandoned mineshafts, and chests in generated structures.