Just a simple tweak for the game: Steel Furnaces are required for the crafting of Electric Furnaces.
I noticed that the ingredients for the electric furnace already encompass the ingredients of the steel furnace so I just simply reduced the cost of the electric furnace recipe and added the Steel Furnace to used instead. So there is no increase or decrease to the crafting of the Electric Furnace, just an extra step.

Why?: I prefer for most items to have purpose towards the late game. Steel furnaces lose relevance very quickly. And i thought that the engineer is just using red circuits to pimp out the old steel furnaces.