This addon brings the following:
Each piece provides protection that is either equivalent to iron or diamond. (Having protection values in decimals may cause issues.)
Its durability is between iron and diamond armors.
Steel Tools and Weapon
Can be crafted back into 9 steel ingots.
Smooth Steel Block
Obtained from putting a steel block in a stonecutter. Can be crafted back into 9 steel ingots.
Coke and Iron
Smelting it in a blast furnace will produce a steel ingot.
Its uses are the same as iron and gold nuggets.
Bluing is process where steel gains a black or blue appearance.