AISi

AISI, the American Iron and Steel Institute, is a North American trade association that represents steel producers and related industries in the United States and Canada. The organization functions as an industry advocate, data producer, and technical resource, engaging with policymakers, regulators, and the public on issues affecting the steel sector. In addition to policy work, AISI compiles market data, conducts research, and provides guidance on standards, sustainability, and safety.

Founded in 1908, AISI coordinates the efforts of major steel producers, processors, and allied organizations. Its activities include publishing industry statistics and analyses on production, capacity, trade, and employment; developing and maintaining technical standards and grade designations; and representing the North American steel industry in international forums, including participation in global steel associations.

AISI is well known for its steel grade designations, which are commonly used alongside SAE and ASTM standards. The four-digit AISI numbers designate carbon steels and certain alloy steels, with examples such as 1018 or 1020. Stainless steels are represented by the 200, 300, and 400 series, including grades like 304 and 316. These designations are widely used in engineering, manufacturing, and procurement to specify material properties and compatibility.

The institute’s work supports industry competitiveness, informs public policy, and promotes the use of standardized data and terminology across the North American steel supply chain.