mixed smelting got you down?

small steel plates require 1 iron plate to smelt, so they won't clog up your furnaces

regular steel plates are now made in an assembler, from 5 small steel plates (or 10 on expensive mode)

i'm not going to maintain this.
if you want non-clogged smelting, use this instead: https://mods.factorio.com/mod/probabilistic-smelting