Pull one part off your rack — a bracket, a flange, a length of tube — and ask the question Customs now asks: where was the metal in it melted and poured? Until this summer that was a sourcing preference. As of June 8 it is the line that decides the duty, and the spread between the right answer and the wrong one is the whole margin on the job.
On June 4 the President signed Proclamation 11032, further adjusting the Section 232 regime for steel, aluminum, and copper. It keeps the headline rates it inherited — an ad valorem duty of 50 percent on products made of those metals, 25 percent on derivative products “that tend to be predominately composed of those metals,” and a temporary 15 percent on a narrow subset, “namely fixed industrial machinery and power equipment.” What changed is everything underneath: which of those rates lands on a given part now turns on provenance you have to be able to prove.
a product's metal content shall be deemed composed entirely of aluminum that was smelted and cast in the United States, of steel that was melted and poured in the United States, or of copper that was smelted and cast in the United States, if such aluminum, steel, and copper account for at least 85 percent of weight of the aluminum, steel, and copper of the product.
Read that number the way a shop floor reads it. Eighty-five percent by weight. Hit it, and the whole part counts as American metal — the reduced lane, in many cases ten percent or, for the listed trading partners, nothing added at all. Miss it by a hair, and the metal content is treated as foreign and dutiable, at rates that climb back to fifty. The threshold is not the price of the steel. It is the weight of American steel against everything else in the part, and it is the number your mill certs either support or don't.
Here is the part I would put in front of every buyer and every estimator on your floor. This is now a documentation problem wearing a metallurgy costume. The proclamation tells CBP to write guidance on assessing U.S. content, and it says the quiet part out loud: if an importer misleads the government about that content, CBP “shall impose penalties.” So the melt-and-pour paperwork is no longer a nice-to-have in the folder. It is the difference between a compliant entry and a fraud finding, and it has to travel with the part.
Neither the certificate nor the weight math was load-bearing in May. Both decide the invoice now.
And the list of what counts as a “derivative” is not fixed — it grows on a schedule. When BIS stood up its inclusions process last August it added 407 Harmonized Tariff Schedule codes to the derivative list in a single action, with a standing request window for adding more. That is the trap under the reduced rates: a part you import clean today can be inside the 232 net by the next window, and the reduced-rate table itself is temporary.
The reduced and country-specific rates in Annex I–C run only “until 11:59 p.m. eastern standard time on December 31, 2027.” On January 1, 2028 the affected products revert to the full Proclamation 11021 rates. Whatever landed cost you quote on a long program past that date is quoting the wrong number unless you've priced the snap-back.
Kept honest: the 50/25/15 percent rates are the standing Section 232 duties recited in Proclamation 11032; the country-specific reductions, the 10 percent U.S.-content rate, and the 85-percent-by-weight test are set for the products in Annex I–C and run June 8, 2026 through December 31, 2027, reverting January 1, 2028 — every figure quoted here is verbatim from the proclamation text (91 FR 34085), fetched and extracted from the govinfo PDF during this run because the Federal Register HTML is WAF-blocked. Exactly which of your parts sit in which annex is an HTSUS-classification question that turns on the specific code and the specific entry; this is the rule of the road, not classification advice for any one part. The 407 added codes are from the BIS inclusions rule of August 19, 2025.
Sources (primary, verified today): Proclamation 11032, “Further Adjusting the Tariff Regimes for Imports of Aluminum, Steel, and Copper Into the United States,” 91 FR 34085, published June 4, 2026, effective June 8, 2026 (document 2026–11314). The Federal Register HTML and text endpoints are WAF/CAPTCHA-blocked; the govinfo PDF (FR-2026-06-04/2026-11314) was fetched with a browser user-agent and text-extracted with pypdf during this run, and every quoted figure — the 50/25/15 percent rates, the 85-percent-by-weight U.S.-content test, the “melted and poured”/“smelted and cast” language, the CBP penalty provision, and the December 31, 2027 expiry — is taken verbatim from that text. The 407 added HTSUS codes are from the BIS inclusions-process rule, published August 19, 2025 (abstract confirmed via the Federal Register API this run).
Two identical steel brackets sit on the same shelf. One clears customs at zero. One carries a 50% duty. The only thing that separates them is a foundry ticket — where the metal was melted and poured. That's the actual state of play after Proclamation 11032, signed June 4 and effective June 8. The headline Section 232 rates didn't move — 50% on articles made of steel and aluminum, 25% on derivatives, a temporary 15% on fixed industrial machinery. What moved is underneath: which rate lands on a given part now turns on provenance you have to prove. The number to put on the wall is 85%. A part's metal counts as American only if U.S.-melted steel (or U.S.-smelted aluminum/copper) is at least 85% of its metal weight. Hit it and you're in the reduced lane — 10%, or nothing added for the listed trading partners. Miss it and the content is foreign and dutiable, back up toward 50. Read that as a shop-floor instruction, because that's what it is: — The test is by WEIGHT of metal, not dollar value. A part that's 84% U.S. steel by weight lives in a different tariff world than one that's 86. Most BOMs have never been read that way. — The melt-and-pour certificate now has to travel with the part. CBP is directed to assess U.S. content, and the proclamation says if an importer misleads the government about it, CBP "shall impose penalties." The paperwork isn't in the folder anymore. It's in the product. — The reduced rates are temporary. Annex I-C runs through December 31, 2027 and reverts January 1, 2028. Any job delivering into 2028 is quoting the wrong landed cost unless you've priced the snap-back. And the derivative list keeps growing — BIS added 407 tariff codes to it in a single action last August. A part you import clean today can be in the net by the next window. The metallurgy didn't change. The paperwork became the product. Source: Proclamation 11032, 91 FR 34085, published June 4, 2026, effective June 8 — govinfo PDF, quoted verbatim.
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FIRST SOURCE · one verified original-source finding, composed for one reader · this edition: metal-fabrication — written for the service centers, fabricators, and heat-treaters whose buyers and estimators now price a part by where its metal was poured