3312  Steel Works, Blast Furnaces (Including Coke Ovens), and Rolling Mills

Establishments primarily engaged in manufacturing hot metal, pig iron, and
silvery pig iron from iron ore and iron and steel scrap; converting pig
iron, scrap iron, and scrap steel into steel; and in hot-rolling iron and
steel into basic shapes, such as plates, sheets, strips, rods, bars, and
tubing. Merchant blast furnaces and byproduct or beehive coke ovens are
also included in this industry. Establishments primarily engaged in
manufacturing ferro and nonferrous additive alloys by electrometallurgical
processes are classified in industry 3313.