The Most Comprehensive Analysis of U.S. Section 232 Metal Tariffs and Section 301 Tariffs on China: High-Risk Product Categories and Practical Guidance to Avoid Pitfalls (Latest 2026 Edition)

When engaging in U.S.-bound trade, it’s no longer sufficient to rely solely on standard Most-Favored-Nation (MFN) tariff rates. As a cross-border logistics provider serving more than 3,000 exporting companies, Huijietong found that, among the U.S.-route customs clearance cases it handled in 2026, return shipments, penalties, and order losses resulting from tariff misclassification still accounted for 37% of all irregularities.

Huijietong advises: For U.S. import tariff compliance in 2026, it is essential to conduct a simultaneous review across three key dimensions—HTSUS 10-digit tariff classification, country of origin, and product material/metallic characteristics.

We’ve seen far too many clients fall into the same trap: conflating Section 232 metal tariffs with Section 301 tariffs on China. Here’s a simple way to tell them apart:

> ⚠️ Huaijietong’s key warning: Metal products originating in China are highly likely to be subject to the MFN ordinary tariff, plus the 232 metal tariff and the 301 tariff on China. For certain product categories, additional AD/CVD anti-dumping and countervailing duties may also apply. With these multiple layers of costs, an unverified quotation could easily erode the entire profit margin of an order.

I. A Rigorous Distinction: Section 232 Tariffs on Metals vs. Section 301 Tariffs on China (Comparison Chart by the Huijie Customs Clearance Team)

The vast majority of customs‑clearance disputes, tax and duty losses, and penalties for inspection stem from a failure to grasp the underlying logic of these two policies. The Huijie Customs‑Clearance team has summarized the key differences as follows:

> Huijie Customs Clearance Guidelines: Every tariff‑classification preliminary report we issue for our clients is based exclusively on the ten‑digit HTSUS code, thereby eliminating at the source the critical error of “directly declaring using Chinese HS codes.”

II. Detailed Analysis of 232 High-Risk Product Categories: Covering Not Only Raw Materials but Also a Wide Range of Derivatives

Following the 2025 tariff adjustments, the policy upgrade in April 2026, and the June expansion of covered product categories, the scope of U.S. Section 232 measures has now extended far beyond basic metal raw materials. Under the current rules, duties are assessed on the total customs value of the goods, rather than solely on their metal content, with machinery, household hardware, warehousing equipment, and electrical components broadly brought under regulatory oversight.

1. All categories of steel and steel products (subject to the highest frequency of inspections)

Industry chain coverage: basic steel → steel hardware → industrial machinery → warehousing equipment → vehicle parts

> Huijietong classification identification keywords: Chapters 72 and 73 of the Harmonized Tariff Schedule, covering products with attributes such as steel, iron, stainless steel, tube, pipe, rack, etc.

2. Aluminum and aluminum-derived products (severely affected sectors include home appliances and consumables)

Industry chain coverage: primary aluminum products → aluminum consumer goods → home appliance components → printed circuit boards

> Huijietong’s key review points: Chapter 76 of the HTS covers products with attributes such as aluminum, foil, profile, and extrusion; aluminum‑based components in Chapters 84 and 85 require particularly thorough verification, as many customers have encountered issues in this area.

3. Copper and copper alloy derivatives (strict scrutiny in the electrical and wiring harness sectors)

According to the CBP’s official CSMS as of July 2025 #65794272 Latest Guidelines The United States imposes a 50% additional tariff on copper products, requiring separate declarations for copper and non‑copper materials, with extremely stringent customs oversight.

> Huijietong’s core declaration requirements: A dual‑line declaration is mandatory, separating the value of copper materials from that of non‑copper materials, and retaining the BOM list and material certificates. Failure to provide supporting documentation will result in taxation based on the full declared value of the goods—this is the most common scenario leading to additional tax assessments during inspections of copper products in 2026.

III. High-Risk Product Categories Subject to Section 301 Tariffs on China: Key Control List for the 2026 Review

At the heart of Section 301 tariffs lies the issue of country of origin. The four foundational lists (List 1–List 4A) from 2018 remain in effect, and following the first four-year review in 2024 and the second review in 2026, tariff rates on strategic sectors such as new energy, semiconductors, and critical minerals have been raised once again.

> Huijietong’s ultimate warning: Goods manufactured in China that undergo only simple transshipment, repacking, or relabeling through third countries such as Southeast Asia or the Middle East do not qualify as substantial processing or transformation. Customs will still classify them as of Chinese origin and impose the 301 tariffs as usual. We have handled numerous cases in which CBP has traced back to companies engaging in “transit‑based tax avoidance,” resulting in additional tax assessments and penalties that far exceed normal tax liabilities.

IV. Huijietong’s Six-Step Standard Self‑Inspection Method: A Must‑Do for Every Shipment Before Customs Clearance

For all shipments on the U.S. route, Huijietong conducts the following six-step closed-loop verification for its customers, effectively mitigating risks of classification errors, underpayment of additional taxes, and customs inspections:

V. Huijietong’s Local Compliance Implementation Plan: Mitigating Tariff Losses at the Source

Tariff risk management is not a reactive measure taken at the customs clearance stage; rather, it is a proactive effort that spans the entire supply chain—from quotation and production to shipment and customs clearance. Huijietong recommends that all foreign trade enterprises and freight forwarding teams implement the following standardized procedures:

> Huijietong’s industry‑specific recommendation: For companies that regularly ship to the U.S., we advise obtaining both U.S. IOR and Bond qualifications. Non‑compliant agency filings are highly likely to trigger CBP’s heightened scrutiny, potentially resulting in cargo being denied entry or subject to mandatory return. Any additional duties, inspection fees, or back‑duties not explicitly agreed upon shall, by default, be borne by the U.S. importer/IOR; such arrangements must be confirmed in writing with the customer in advance.

VI. Four Common Misconceptions in the Industry (90% of Huijietong’s consulting clients have fallen into these traps)

Correcting entrenched perceptions to eliminate tariff risks at their root:

VII. Final Practical Summary of Huijietong

By 2026, the cornerstone of trade risk management on U.S. routes will no longer be mere price‑based booking; it will instead hinge on sophisticated tariff‑compliance management. For all export orders involving metal products, machinery and equipment, home appliance components, electrical cables, warehouse racking, automotive parts, new energy technologies, and medical consumables, “HTS classification verification + Section 232/301 screening + material traceability + proof of origin” must be established as a standard shipping procedure.

> Huijietong’s optimal compliance solution: Establish a dedicated U.S. import‑tariff file for each shipped SKU, with policy updates synchronized in real time, ensuring controllable pricing, hassle-free customs clearance, and proactive risk mitigation.

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Policy origin and source (officially verifiable)

• June 9, 2025: Federal Register—Notice of Adjustments to U.S. Steel and Aluminum Import Tariffs

• April 9, 2026: Federal Register—Announcement of Updated Tariff Treatment for Steel, Aluminum, and Copper Derivatives under Section 232

• June 4, 2026, Federal Register: Addition of Tariff Lines for Metals (Shelves, Printed Circuit Boards, Industrial Equipment)

• 2025.07.31 CBP Official CSMS #65794272 : Official Guidelines for Import Declaration of Copper and Copper Derivatives

• USTR Official: Public Notice on the Section 301 Tariff List, Four-Year Review, and Exemption Procedures

• September 2024 and May 2026: Federal Register—Announcements of Revisions to the Second Review of Section 301 Trade Policies Toward China

> Disclaimer: This article has been compiled by the Huijietong Cross‑Border Compliance Research Institute based on publicly available U.S. government policies. It is intended solely for industry‑wide risk awareness and practical reference and does not constitute professional advice on customs classification, taxation, or legal matters. For specific customs clearance and declaration procedures, please refer to the latest applicable regulations, product documentation, and expert customs‑clearance assessments. If you require tariff‑classification pre‑determination or compliance consulting, please contact Huijietong’s team of professional advisors.