The Refined Iron is created by putting 1 Iron and 6 Compressed Air Cells inside a Blast Furnace. It is used in the construction of many advanced machinery, such as the Advanced Machine Block. It can also be used as a Steel Ingot in other mods.
Refined Iron Plate
Now some further instructions for those customers, who bought the slightly less expensive versions of this products-row in crafting blueprints form.
I would still recommend that you BUY all machines instead, but if you really want to, you may craft them as well.
First of all, you need the basic resource for all kind of advanced machines:
It's secret knowledge revealed to you now, but you can actually smelt iron ingots to even better iron ingots. Isn't that great?
They look better AND for sure are much more useful!