On June 7, 2018, U.S. Customs and Border Protection released an updated FAQ on the Section 232 steel and aluminum tariffs.
The FAQ answers questions from the trade on timing of duty calculations, free trade agreements, exempt countries, and other topics.
The FAQ may be found here:
https://www.cbp.gov/trade/programs-administration/entry-summary/232-tariffs-aluminum-and-steel/faqs
Additional information on Section 232 tariffs may be found here:
https://www.cbp.gov/trade/programs-administration/entry-summary/232-tariffs-aluminum-and-steel