According to JD Supra, historically, the Buy America Act, enacted in 1933 (BAA), primarily related to iron and steel, and manufactured products that were predominantly iron and steel. BABA expanded the application of the BAA rules to cover iron and steel, manufactured products, and construction materials.
For iron and steel, BABA requires both iron and steel to be “produced in the United States” and that “all manufacturing processes, from the initial melting stage through the application of coatings” must occur in the U.S. This refers to all iron and steel in a project and is not limited to only certain types of steel. Moreover, these iron and steel requirements attach to manufactured products that are predominantly iron and steel – products that are over 50 percent iron and steel.