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Contents (3)
Build the Blast Furnace
The Blast Furnace is a multiblock that turns Iron Ingot and 
Coal Coke into 
Steel Ingot. Build it from 
Blast Brick, 
Blast Brick Slab, and a 
Blast Furnace Preheater. Place the Blast Furnace block as the controller and form the 3x3x3 shell around it. The Preheater must sit on top and be fed Coal Coke to keep the furnace hot.
Run It
Insert Iron Ingot and Coal Coke into the furnace. It consumes both and outputs Steel Ingot plus 
Slag as a byproduct. Slag can be crafted into 
Concrete or used in Clinker Brick recipes. Keep the Preheater stocked — if it runs out of Coal Coke, the Blast Furnace stops.
What Steel Unlocks
Steel Ingot is the gateway to nearly everything: 
Steel Plate, 
Steel Scaffolding, 
Steel Wire, Arc Furnace, Assembler, 
Metal Press, and Crusher frames. Craft Steel Plate at an Engineer's Workbench or Metal Press. Once you have a steady steel supply, build an 
Alloy Kiln to make Constantan, Electrum, and other alloys from Copper, Nickel, 
Silver, and Gold. From there, expand into Arc Furnace 
smelting and Assembler automation.