The report summarizes a portion of the results of a continuing study of the future raw material needs of the U.S. steel industry. The purpose of the work reported here is to explore the effects of changes in technological and policy variables on capacity, raw material, and energy requirements of the domestic iron and steel industry. It is not the purpose of this work to make judgments about the efficacy of maintaining an industry capable of producing to meet demand during peak periods--only to state what the requirements of the industry will be under certain assumptions. All steps in the manufacture of steel from the mining of raw ore to the production of finished steel are considered. The requirements of the iron and steel industry of the United States for raw materials, scrap, productive capacity, and fuels, including the extent and form of the fuels and energy consumed, are determined as a function of the following variables: (1) level of steel demand, (2) impact of changing technology, (3) changing process mix in steelmaking, (4) level of steel imports, and (5) level of exports of scrap.