Click on the alphabetic index to display terms beginning with the corresponding letter or search for a term below.

Reducing Agent

Process of adding natural gas or coal to remove oxygen from iron ore to produce a scrap substitute. Iron ore can be heated as natural gas passes through it or combined with ground or gasified coal and heated. Oxygen in the ore combines with carbon and hydrogen reducing the iron.

Reinforcing Bar (Rebar)

A commodity-grade steel used to reinforce concrete in highway and building structures.


The impurities remaining in mini-mill steels resulting from the wide variety of metals entering the process.

Reversing Mill

A stand of rolls that passes steel back and forth between the rolls in order to reduce the steel sheet or plate. The distance between the rolls is reduced after each pass.


Semi-finished steel that is rolled from a billet and is commonly used for wire products, bolts, and nails.

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