The majority of steel industry facilities are covered by NAICS 331111 (iron and steel mills). This sector accounts for more than 95% of steel industry energy use. Of the remaining NAICS for the steel industry, only 331112 (electrometallurgical feroallor products) and 3312 (sheet product manufacturing from purchased steel) have data classified in the most recent MECS.

Source: DOE 1999, AISI 1998

* Taken as the difference between known total industry use and known subtotal use