Great script Link! I appreciate it!! Some things to be noted, though:
1). Some people have pointed out that the script starts before you select a bar type, not a huge deal.
2) It doesn't seem to work when I select "Low CPU" in the advanced settings tab, it'll withdraw the ores, and then rebank them because I guess it takes too long to close the bank with low cpu selected. This is easily remedied by Unchecking "Low CPU" lol. Would be awesome if it had a failsafe for that, though!
3) Sometimes it tries to superheat too fast, and then stands there wondering "WTF" for a second or two, not really a problem either, just thought it was funny while I was watching it.
4) Sometimes it'll get into a loop of withdrawing the needed steel bar items and then banking them again, without superheating anything. I assume this has something to do lag, as it's the same problem I have when I switch to low CPU.
5) When making steel bars it'd be much faster and more realistic if instead of actually selecting "Withdraw x" and withdrawing 18 coal, the bot just withdrew all. And to kick this up another notch, before it banks the steel bars, it withdraws the coal (withdraw all), THEN banks the steel bars, then withdraws all the iron ore! This would increase the speed greatly.
None of these are huge problems.
If anything I'd say #5 is the only thing that really needs to be changed. Keep up the excellent work. Impressed by this script, it was much needed!