Section 232 steel, aluminum, and copper: how to check if your HTS owes extra duty

You already have (or almost have) a 10-digit US HTS for a steel, aluminum, or copper article — or a derivative part. This page is a checklist: confirm Chapter 1–97 classification, find live Chapter 99 / 9903.8x treatment for Section 232 metals, and collect origin / melt-pour / smelt-cast / U.S. content facts when Canada or Mexico preferential treatment applies. Method guide only — not a pasted 232 rate table; not a rewrite of Costvanta’s pharmaceutical Revision 20 Insight.

Disclaimer: Educational. Section 232 applicability depends on correct classification, the product as imported (including derivative scope), country of origin, any required melt-pour / smelt-cast / U.S. content facts, and Chapter 99 provisions in force on the entry date. Costvanta does not model Section 232 duties. Confirm with the current USITC HTS, CBP, and your broker. Decision support only — not legal advice, not binding.

What Section 232 means for steel, aluminum, copper, and derivatives

Section 232 of the Trade Expansion Act of 1962 authorizes national-security actions on imports. For metals, successive proclamations address aluminum, steel, and copper articles and derivatives. When coverage, origin or content facts, and entry date line up, additional treatment runs through Chapter 99 — commonly the 9903.82 family and related U.S. notes in CBP practice — on top of the Chapter 1–97 Column 1 General rate. It does not replace ordinary classification.

CN callout: 加征 = additional duty beyond the base General rate.

This page = how to check; not a frozen rate table

Proclamations, annexes, Harmonized System Updates (HSU), and Chapter 99 notes move. This article teaches where to look and in what order. It is not a frozen percentage dump and not a complete derivatives annex.

Not the same as Costvanta’s pharma Rev 20 Insight

Costvanta already published a narrow pharmaceutical Chapter 99 / HTS 2026 Revision 20 slice:

→ HTS 2026 Revision 20: Pharmaceutical Section 232

That page is related only. A steel fastener, aluminum bracket, or copper derivative part is a different product and Chapter 99 path. Do not treat Rev 20 as enough for metals.

Prerequisite: a credible US HTS first

If you lack a defensible 10-digit for entry, finish classification first:

→ How to find your US HTS code and read the full duty stack

Return here once you have a candidate subheading to test against live Chapter 99.

What you need before you search

Correct 10-digit US HTS — not China HS / Schedule B

Entry uses the full 10-digit statistical reporting number. A supplier’s China HS, a 6-digit international HS, or a US Schedule B export number is not a substitute. Confirm on hts.usitc.gov or via the pillar / Costvanta.

Country of origin (+ melt-pour / smelt-cast when relevant)

Country of origin drives many trade-remedy checks. For steel, aluminum, and copper programs, CBP may also require melt and pour (steel) or smelt and cast (aluminum / copper) country facts — declarant / supply-chain facts, not something you read off the HTS digits alone.

CN callout: 原产地 is origin; 熔炼浇铸 (melt-pour / smelt-cast) is a separate supply-chain field when required.

Product as imported: primary metal vs derivative

Section 232 metals regimes cover primary metal articles and derivative articles (parts and finished goods within proclamation scope). Ask whether the good as imported falls in primary-metal or derivative coverage under the current notes. Do not invent a complete derivatives list from a blog — scope lives in the live HTS and official annexes.

Planned entry date / HTS revision in force

Chapter 99 headings, U.S. notes, and HSU packages change. Confirm the revision for your planned entry on hts.usitc.gov, and re-check close to that date. CSMS bulletins signal that lines moved; they are not a substitute schedule.

Step 1: Confirm the ch.1–97 classification first

232 Chapter 99 rides with ordinary classification

Wrong Chapter 1–97 HTS → wrong Chapter 99 path. Finish a credible ch.1–97 candidate before arguing covered / not covered under §232.

Costvanta / USITC / pillar for candidates

Build a fact sheet (material, function, condition as imported). Walk the tree on hts.usitc.gov or use the pillar guide. Optionally paste the same description into Costvanta for candidate codes and General-rate context — then return here for the 232 Chapter 99 check.

Mid CTA: Confirm your candidate HTS on https://www.costvanta.com, then finish the live Chapter 99 path below.

Explicit: Costvanta does not add a 232 layer

Costvanta’s calculator scope is MFN (General) + Section 301 (where modeled) + MPF. Section 232 duties are not modeled. See Methodology — Import. After candidates, open live USITC Chapter 99 / CBP materials (and a broker when risk is material).

Step 2: Find applicable Chapter 99 / 9903.8x in the live HTS

Open hts.usitc.gov; read footnotes, U.S. notes, and pointed Ch.99

1. Open hts.usitc.gov.
2. Search your ch.1–97 subheading.
3. Read footnotes / endnotes that point to Chapter 99 for steel, aluminum, or copper §232.
4. Open the cited Chapter 99 heading(s) and the U.S. notes (scope, dates, carve-outs).
5. Decide — for this merchandise, origin/content facts, and entry date — whether an additional applies, a carve-out fits, or you need a broker.

Record the check date. Frame any example as as of [date]; re-check live.

9903.82 family as lookup target — not a pasted rate sheet

CBP practice for metals and derivatives often discusses headings in the 9903.82 range (and related notes). Treat that family as a lookup target in the live HTS — not as a rate sheet from a competitor index. Do not invent a complete 9903.82.01–.26 grid here. Open current headings and notes on USITC for your entry date.

As of 2026-10-17 Asia/Shanghai; re-check live before every quote.

Signal lines move: CSMS #70197855 (HSU 2626)

CSMS #70197855 — Harmonized System Update (HSU) 2626 (CBP bulletin dated 2026-10-14) states that HSU 2626 was created on 2026-10-09 and contains Section 232 updates. The bulletin body does not publish a complete HTS code / rate list. Load the HSU / live HTS. Questions on those updates: [email protected] (per the bulletin).

Earlier metals CSMS (e.g. CSMS #68253075, CSMS #68855869) = procedure only; open at use time; no historical % as current truth. Also: Trade Remedies; 232 FAQs.

Step 3: Canada / Mexico — U.S. content, melt-pour, smelt-cast

Proclamation 11032 and BIS U.S. content guidance

Proclamation 11032 (91 FR 34085; signed 2026-06-01, published 2026-06-04) further adjusts aluminum, steel, and copper regimes and addresses preferential Canada / Mexico treatment via clause (2)(d) U.S. content concepts.

BIS / Commerce guidance at 91 FR 65162 (FR Doc 2026-20938; govinfo HTML backup) tells CBP how to assess “U.S. content” for products of Canada and Mexico that qualify for USMCA preferential tariff treatment, for implementing clause (2)(d).

Effective: products entered for consumption, or withdrawn from warehouse for consumption, on or after 12:01 a.m. Eastern Time on 2026-10-14, per that BIS notice.

What “U.S. content” means (high-level) + declarant facts

Per the BIS notice, “U.S. content” means: (1) value attributable to parts wholly obtained, entirely produced, or substantially transformed in the United States; and (2) to the extent not already counted, value attributable to steel melted and poured in the United States, aluminum smelted and cast in the United States, and/or copper smelted and cast in the United States.

CN callout: 美国含量 = U.S. content — a value / supply-chain construct, not an HTS digit pattern.

Critical: U.S. content, melt-pour, and smelt-cast are declarant / supply-chain facts, not HTS-inferred. Costvanta cannot invent them from a description. Collect mill / fabricator documentation; broker when material.

If the shipment is not CA/MX preferential under this program, skip the U.S.-content path — still run the general 232 Chapter 99 check for other origins (China-origin metal may also need a separate 301 check).

Step 4: Stacking awareness (MFN + 301 + 232) — conceptual only

Full burden concept + China dual check

1. Base: Column 1 General on the Chapter 1–97 line.
2. Section 301 Chapter 99 (tech-transfer): when China-origin coverage + date + notes line up.
3. Forced-labor Section 301 (9903.05): when origin economy + date + notes line up — see the forced-labor 301 HTS check. Note 52(f) / 9903.05.90 may carve metals out of forced-labor 301; that does not answer whether 232 itself applies.
4. Section 232 Chapter 99: when metals / derivatives coverage + origin or content facts + date + notes line up.
5. Other Chapter 99 layers as applicable.
6. Low-value entry path: under-$800 commercial metal SKUs still need an appropriate formal/informal (or mail) entry after de minimis suspension — see the Section 321 de minimis / low-value entry guide. Entry-path choice does not replace this 232 Chapter 99 check.
7. Landed cost: Costvanta does not model 232 in the duty stack — verify 232 on live sources, then fold freight/MPF/HMF into US import landed cost.

Effective burden is the combination that applies — not General alone. No stacked percentages invented here. China-origin metal SKUs may need both a 301 check and this 232 check — different programs. Completing one does not finish the other.

→ How to find your US HTS code and read the full duty stack

CBP’s informational Unstacking Certain Tariffs Chart is awareness only — not a full unstacking guide; no invented stacked %. For reporting Ch.99 with Ch.1–97, see CBP Section 232 FAQs — no invented sample line items here.

What Costvanta does and does not do for 232

Quote from methodology: “Section 232 duties are not modeled.”

• Methodology — Import
• Homepage tool
• Data sources

Worked mini-walkthrough

Primary: hypothetical steel / aluminum derivative part (fastener or bracket)

SKU (hypothetical): Steel fastener or aluminum mounting bracket. Assume a candidate 10-digit — not a permanent “on/off 232” fact for any real HTS.

As of 2026-10-17 Asia/Shanghai; re-check live:

1. Confirm ch.1–97 on hts.usitc.gov (material, function, condition as imported).
2. Read footnotes / U.S. notes pointing to Chapter 99 for steel or aluminum §232. Open the cited family (commonly 9903.82-range lookup targets in CBP practice — confirm live; do not memorize a blog grid).
3. Origin / supply-chain fields. If melt-pour or smelt-cast is required, collect declarant facts — not from HTS digits.
4. Bucket (no %): covered → report applicable Ch.99 with ch.1–97 per CBP and confirm rates only from live sources for that date; carve-out → document heading/note/dates/limits and broker-check if material; unclear → need broker.

Sidebar: CA/MX preferential after 2026-10-14

Same candidate, CA/MX origin and USMCA preferential, entered on or after 12:01 a.m. ET 2026-10-14: run the general Chapter 99 path, then collect U.S. content and melt-pour / smelt-cast docs under Proclamation 11032 clause (2)(d) and BIS 91 FR 65162. Do not invent a U.S. content %.

Contrast callout: pharma Rev 20

Costvanta’s pharmaceutical Revision 20 Section 232 Insight is a different product slice. Pharma Rev 20 ≠ metals / derivatives 232 check for a fastener or bracket.

What to do next

1. Confirm candidate 10-digit on https://www.costvanta.com, then re-verify on hts.usitc.gov (footnotes, U.S. notes, Chapter 99 / 9903.8x) close to entry.
2. Watch CSMS #70197855 / HSU and the Trade Remedies hub — lines move.
3. CA/MX preferential after 2026-10-14: collect U.S. content / melt-pour / smelt-cast per 91 FR 65162. China origin: also run the 301 method check.
4. Broker (and binding ruling if needed) when value, derivative scope, or content claims are high risk. Bookmark data sources.

CTA: Run the description on https://www.costvanta.com, then finish the 232 Chapter 99 path on live HTS / CBP. Costvanta does not calculate 232.

FAQ

Is the published Rev 20 pharma Insight enough for my steel part?

No. Rev 20 is a narrow pharma Chapter 99 slice. Metals / derivatives need this method: live HTS Chapter 99 / 9903.8x plus origin and supply-chain fields.

Can I read U.S. content off the HTS number alone?

No. Under BIS guidance for Proclamation 11032 clause (2)(d), U.S. content is value from U.S. parts and (if not already counted) U.S. melted-and-poured steel or U.S. smelted-and-cast aluminum / copper — declarant facts, not HTS digits. Costvanta cannot invent them from a description.

My broker said 9903.82.xx last quarter — still true?

Not eternal fact. HSU / CSMS (including CSMS #70197855) show 232 records move. Re-check current headings and U.S. notes on hts.usitc.gov for your entry date.

Does China 301 replace 232 or stack with it?

Neither “replace” nor an invented stacked %. Different programs; China-origin metal often needs both checks. See the 301 method and CBP’s Unstacking Certain Tariffs Chart (awareness only).

Does Costvanta replace checking Chapter 99 for 232?

No. Costvanta helps with HTS candidates and (where available) MFN + 301 + MPF (homepage; methodology; data sources). Section 232 duties are not modeled. Verify Chapter 99 on USITC and CBP. Not accepted as-is by CBP; not a binding determination.

Do Free Trade Agreements automatically waive Section 232?

Not as a blanket rule. CBP’s Section 232 FAQs: Section 232 duties may not be waived due to a Free Trade Agreement. Preferential CA/MX treatment under Proclamation 11032 clause (2)(d) is a specific U.S.-content framework — do not assume “FTA = no 232.”

Disclaimer: Educational only. Costvanta does not model Section 232. Re-check live USITC HTS, CBP guidance, and your broker. Not legal advice; not binding on CBP.