Section 232 Tariff Guide: What Customs Brokers Need to Know About Steel & Aluminum Duties
If you handle imports of steel, aluminum, or any of their downstream derivatives, Section 232 tariffs are among the most consequential duty programs you will encounter. Since 2018, these tariffs have added layers of complexity to customs entries, from steel splits and melt-and-pour declarations to Chapter 99 codes that stack on top of existing duty rates. This guide breaks down how Section 232 works, which products are covered, and what brokers need to get right on every entry.
What Is Section 232?
Section 232 refers to Section 232 of the Trade Expansion Act of 1962, a statute that authorizes the President of the United States to impose tariffs or other trade restrictions on imports that threaten national security. The process begins with an investigation conducted by the U.S. Department of Commerce, which evaluates whether a particular category of imports is entering the country in quantities or under circumstances that could impair national security.
If Commerce finds a threat, the President has broad discretion to take action, including imposing ad valorem tariffs, absolute quotas, or tariff-rate quotas. Unlike Section 301 actions (which address unfair trade practices) or antidumping and countervailing duties (which target specific exporters), Section 232 measures are sweeping: they apply to an entire product category regardless of the exporting country, unless specific exclusions are granted.
Current Section 232 Tariff Rates
The active Section 232 tariffs were originally imposed in March 2018 under Presidential Proclamation 9705 (steel) and Proclamation 9704 (aluminum):
Product CategoryTariff RateEffective SinceSteel articles25%March 23, 2018Aluminum articles25%March 23, 2018 (originally 10%, raised to 25%)
The aluminum rate was initially set at 10% and was subsequently raised to 25%. These rates are assessed in addition to any normal trade relations (NTR) duty, making them an add-on cost that stacks with Column 1 rates in the Harmonized Tariff Schedule.
Which Products Are Covered?
Section 232 tariffs apply to a broad range of steel and aluminum articles. The covered steel products generally fall under HTS Chapters 72 (iron and steel) and 73 (articles of iron or steel), while aluminum products are classified under Chapter 76.
Steel Derivatives
Recognizing that importers were circumventing the original tariffs by importing downstream products made from steel, the program was extended to cover steel derivative products such as nails, staples, certain steel structural components, and other fabricated steel articles. These derivatives are subject to the same 25% tariff and are identified through specific HTS subheadings added by subsequent proclamations.
Aluminum Derivatives
Similarly, aluminum derivative products, including certain wrought aluminum articles, were added to the program. Brokers must check each shipment against the current list of covered HTS codes, as the scope has expanded multiple times since 2018.
Tip: The covered product list is maintained through Chapter 99 headings in the 9903.80.xx series. Always cross-reference your HTS classification against the latest Chapter 99 notes to confirm whether a product is subject to 232 duties.
Country Exclusions and Quota Arrangements
When Section 232 tariffs were first imposed, several countries negotiated exclusions or alternative quota arrangements. These have shifted significantly over the years:
- Country exclusions: Certain countries were temporarily excluded from 232 tariffs through bilateral agreements. For example, Australia maintained a broad exclusion for steel, while Argentina, Brazil, and South Korea accepted quota arrangements in exchange for tariff relief.
- Quota-based alternatives: Countries that accepted quotas agreed to cap their steel or aluminum exports to the U.S. at specified volumes. Once the quota was filled, additional imports became subject to the full 232 rate.
- Removal of exclusions: Many of these country-level exclusions have since been revoked. Brokers must verify the current status of any claimed exclusion at the time of entry, as relying on outdated information is a common compliance failure.
Product-specific exclusions have also been available through a petition process administered by Commerce, though processing times and approval rates have varied widely.
Impact on Customs Entries: Steel Splits and Chapter 99 Codes
Section 232 has fundamentally changed how brokers prepare customs entries for steel and aluminum shipments. The most significant operational impact is the steel split requirement.
What Is a Steel Split?
A steel split occurs when a single commercial invoice line must be broken into multiple entry lines on the CBP Form 7501 to properly account for Section 232 duties. Each covered product requires its own tariff line with the applicable Chapter 99 code (from the 9903.80.xx series) reported alongside the primary HTS classification.
For example, a shipment of steel pipe classified under HTS 7304.31 must also carry the corresponding 9903.80.xx code that triggers the 25% duty. If the same shipment includes both covered and non-covered steel articles, they must be split into separate lines, each with the correct Chapter 99 treatment.
Reporting on the 7501
CBP expects the following on entries involving Section 232 merchandise:
- The primary HTS number for the product
- The applicable Chapter 99 code from the 9903.80.xx series on a separate line
- Correct duty computation reflecting the 232 rate applied to the entered value
- Country of origin based on melt-and-pour rules (not country of export)
- Proper use of SPI (Special Program Indicator) codes where exclusions apply
Getting these elements wrong leads to rejected entries, requests for information, and potential penalties. Automating 7501 preparation is one of the most effective ways to reduce errors on 232-related entries.
Melt-and-Pour Requirements
One of the most critical and frequently misunderstood aspects of Section 232 compliance is the melt-and-pour rule. For steel products, the country of origin for 232 purposes is determined by where the steel was melted and poured, not where it was last substantially transformed or where it was shipped from.
This means a steel product fabricated in Country A from raw steel that was melted and poured in Country B must be reported with Country B as the country of origin for 232 tariff purposes. The distinction matters significantly when exclusions or quota arrangements apply to specific countries.
Compliance note: Importers are required to provide a melt-and-pour certificate or declaration to their broker. CBP has increased enforcement around these declarations, and failure to accurately report the melt-and-pour country can trigger penalties and increased examination rates.
Brokers should establish clear documentation requirements with their importer clients, ensuring that melt-and-pour information is collected at the purchase order stage, well before the goods arrive at port.
How Section 232 Interacts with Other Tariff Programs
Section 232 duties do not exist in isolation. They can and do stack with other tariff programs, creating significant cumulative duty burdens:
Tariff ProgramStacking BehaviorSection 301 (China tariffs)Applies in addition to 232. A steel product from China may owe NTR duty + 25% (232) + 25% or more (301).IEEPA tariffsCountry-specific tariffs imposed under the International Emergency Economic Powers Act stack on top of 232 duties for covered products.AD/CVD (Antidumping/Countervailing Duties)Apply independently. A product can be subject to AD/CVD orders, 232, and 301 simultaneously.NTR / Column 1 dutyThe base HTS duty rate always applies. 232 is assessed on top of the entered value.
For steel products originating in China, the effective duty rate can exceed 75% or more once all applicable programs are combined. Accurate HTS classification is essential to determining exactly which programs apply to a given product.
IEEPA Tariff Changes and the Evolving Landscape
The International Emergency Economic Powers Act (IEEPA) has introduced a new dimension to the trade compliance landscape. IEEPA-based tariffs, which began applying to imports from various countries in 2025, operate as a separate legal authority from Section 232 but affect many of the same products.
For customs brokers, the practical impact is significant: IEEPA tariffs apply broadly based on country of origin and stack on top of existing duty programs, including Section 232. A steel import may now be subject to NTR duty, Section 232 at 25%, and an IEEPA country-specific rate, all on the same entry line.
The IEEPA tariff landscape has been fluid, with rates and country coverage subject to change through executive action. Brokers must monitor Federal Register notices and CBP guidance messages closely to ensure duty calculations remain accurate.
Common Compliance Pitfalls
After years of working with Section 232 entries, certain errors come up repeatedly across the industry:
- Incorrect country of origin: Using country of export instead of melt-and-pour country for steel products.
- Missing Chapter 99 codes: Failing to add the required 9903.80.xx code as a separate tariff line on the 7501.
- Improper steel splits: Combining covered and non-covered products on a single entry line, or splitting them incorrectly.
- Stale exclusion data: Applying a country exclusion that has been revoked or a product exclusion that has expired.
- Duty miscalculation from stacking: Failing to account for 232 duties alongside 301, IEEPA, or AD/CVD on the same product.
- Incomplete documentation: Not obtaining melt-and-pour declarations from suppliers before entry filing.
- Derivative product oversight: Not recognizing that a downstream product qualifies as a steel or aluminum derivative subject to 232.
Each of these errors can result in duty underpayments, CBP penalties, increased audit scrutiny, or delays at the port. Given the volume of steel and aluminum imports processed daily, even small per-entry errors compound quickly across a brokerage operation.
Proactive compliance, including automated checks against current 232 product lists, real-time melt-and-pour validation, and systematic steel split automation, is the most reliable way to prevent these issues at scale.
See How Cervo Automates Section 232 Compliance
From steel splits to melt-and-pour validation, Cervo handles the complexity of 232 entries so your team can focus on higher-value work.
