The 2025 Section 232 steel measures changed in several stages. Country arrangements, exclusions, tariff rates, and derivative-product coverage were addressed in different documents. For a flat-rolled steel buyer reading a historical quote, separating those subjects makes the sequence easier to follow. The dates below describe the 2025 actions; they do not establish the duty applicable to a shipment today.
March 2025: country arrangements and exclusions end
A February 10, 2025 steel proclamation ended the Section 232 arrangements with Argentina, Australia, Brazil, Canada, EU countries, Japan, Mexico, South Korea, and the United Kingdom as of March 12, 2025. From that date, steel articles and derivative steel articles imported from those countries were subject to the additional ad valorem tariff proclaimed in Proclamation 9705. The US Geological Survey's February 2026 industry summary describes the March 2025 change as a move to a 25% tariff for all countries, removing prior exceptions.
The February proclamation also terminated existing general approved exclusions as of March 12, 2025. Granted product exclusions received different treatment: they remained effective until their expiration date or until the excluded product volume had been imported, whichever occurred first. The distinction matters when reading references to exclusions in documents from that period. An end to general approved exclusions did not mean that every granted product exclusion ended on the same date.
When comparing historical paperwork, keep the country arrangement and the type of exclusion separate. A broad reference to an exemption leaves an important question unanswered: was the document describing a country arrangement, a general approved exclusion, or a granted product exclusion with its own remaining term or volume?
June 2025: the rate goes to 50%
The June 3, 2025 steel and aluminum proclamation raised the tariff on imports of steel articles and derivative steel articles from 25% to 50% ad valorem, effective at 12:01 a.m. eastern daylight time on June 4, 2025. Ad valorem describes a duty expressed as a percentage of value. Keeping the effective date beside the rate avoids treating a figure from one stage of the year as a description of the entire year.
The proclamation also addressed tariffs on non-steel and non-aluminum content. That makes the composition of an article a separate issue from the headline steel rate. For a derivative product, a percentage associated with steel content should not automatically be read as the complete tariff treatment of every component. The August notice below explains the distinction between covered metal content and other content more directly.
Derivative products and the inclusions process
The Bureau of Industry and Security, within the US Department of Commerce, established the Section 232 Inclusions Process through an Interim Final Rule effective April 30, 2025. Its first two-week submission window opened May 1, 2025. A Federal Register notice dated August 19, 2025 added 407 Harmonized Tariff Schedule of the United States (HTSUS) codes to the list of products considered steel or aluminum derivatives. That was a combined steel-and-aluminum list, not a count of flat-rolled steel products alone.
For those products, the notice stated that Section 232 steel and aluminum tariffs applied to the steel and aluminum content. Non-steel and non-aluminum content remained subject to reciprocal and other applicable tariffs. BIS did not include 60 other HTSUS codes at that time because they were subject to other ongoing investigations under Section 232 or other trade statutes.
The inclusion process concerns which products fall within derivative coverage. It should therefore be read alongside the rate changes, rather than treated as another way of expressing the same change. A historical comparison needs both the relevant product classification and the dated action being discussed.
What this means when comparing quotes
Start a comparison by identifying the product, the date, the origin documentation, and whether the discussion concerns a steel article or a derivative article with different types of content. Then distinguish the stated material price from the duty assumptions used in the comparison. A quoted percentage by itself does not explain the classification, content, or exclusion assumptions behind a historical calculation.
The USGS summary notes that various extensions, exclusions, and reciprocal clauses were introduced throughout 2025. Its annual overview is useful for understanding the sequence, but it is not a substitute for checking the relevant official customs notices and Commerce guidance for a present-day transaction. This timeline provides industry context rather than legal or customs advice, and makes no claim about any supplier's imports, documentation, or tariff position.