Section 301 Four-Year Review Opens May 7 — China Tariff Continuation Window Begins as Air Compressor and Tin Mill Probes Stack On

Executive Summary

As of May 6, 2026, the U.S. Trade Representative formally launched the second statutory four-year review of the Section 301 China tariffs (FR Doc 2026-08806). The continuation request window opens tomorrow, May 7, 2026 for the July 6, 2018 action and June 24, 2026 for the August 23, 2018 action. The Tariff Tracker Desk flagged this as the single most consequential trade-policy event of Q2 2026: ~$370B in annual U.S. imports sit under Lists 1-4A duties (7.5%-100%), and absent continuation requests, those duties are subject to termination.

Layered on top, Commerce and the ITC opened or advanced at least nine new or recurring AD/CVD actions this week. Most disruptive: preliminary AD/CVD on air compressors from China, Malaysia, Vietnam under HS 8414.80.16 (FR Doc 2026-08683), with ITC preliminary due June 15, 2026. Commerce initiated a CVD on tin mill products from China (FR Doc 2026-08744). Preliminary AD margins posted on aluminum foil from Oman (2026-08780) and Türkiye CVD (2026-08951), and India welded stainless pressure pipe (2026-08953). FRED macro: March 2026 trade deficit widened to -$60.3B, Import Price Index at 144.6, PPI Manufacturing +3.15% MoM to 265.27.

Five ITC five-year sunset reviews were instituted May 1, 2026: welded line pipe Korea/Türkiye (2026-08514), steel grating China (2026-08510), steel nails 5-country (2026-08509), carbazole violet pigment 23 (2026-08508). Combined with sunset-final continuations on passenger tires from China (2026-08635, -08634), wood mouldings (2026-08736, -08737), and PC steel wire strand from 14 countries (2026-08636, -08637), the China and Asia-LATAM tariff scaffolding is being reinforced for another five-year cycle.

This week, you should: (1) Domestic producers benefitting from any Section 301 list — file continuation requests May 7-July 5, 2026 (List 1/2). (2) Air compressor importers — pull POI export-volume data immediately. (3) Aluminum foil importers — model Türkiye CVD (2026-08951) and Oman AD (2026-08780) preliminary rates. (4) File ITC entries of appearance on the five sunset reviews within 21-day windows.

The Week In Numbers

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Reading the dashboard: The 3.15% one-month surge in PPI Manufacturing to 265.27 is the headline. Over a three-month horizon the index has climbed from 251.88 (Dec 2025) to 265.27 (Mar 2026), a 5.3% acceleration that almost entirely tracks tariff pass-through. The Import Price Index trend is more measured at +1.7% over three months, suggesting foreign suppliers are absorbing roughly half of the duty pressure. The trade-weighted dollar at 118.39 is flat over two weeks but has weakened from the 119.10 peak on April 29 — softening dollar amplifies tariff cost inflation. The widening March goods-and-services deficit to -$60.31B confirms front-loaded Q4 2025 inventory builds are unwinding and Q1 2026 imports surged 6.79% QoQ to $4.42T annualized.

Key Signals This Week

Signal 1: USTR Section 301 Four-Year Review — Continuation Window Opens Tomorrow

• What happened: USTR FR Doc 2026-08806 formally initiates the second statutory four-year review of both Section 301 actions. Continuation requires a written request from a benefitting domestic industry.
• Who is affected: All importers of Chinese-origin merchandise on Lists 1-4A — ~12,000+ HTS subheadings; ~$370B at 7.5-100% duty.
• Estimated financial impact: FY2025 Section 301 duty collections ~$77B. Termination would yield ~$77B annual cost reduction but is highly unlikely.
• Recommended action: Domestic producers file via USTR portal May 7 - July 5, 2026 (List 1/2) and June 24 - August 22, 2026 (List 3/4A).
• Deadline: May 7, 2026 opens; July 5, 2026 closes for List 1/2.
• Risk if ignored: Producers who fail to file effectively vote for termination of their own protection.

Signal 2: New AD/CVD on Air Compressors from China, Malaysia, Vietnam

• What happened: ITC instituted preliminary AD/CVD 701-TA-794-796 / 731-TA-1790-1792 (FR Doc 2026-08683) under HS 8414.80.16.
• Who is affected: Importers of industrial air compressors. U.S. imports ~$1.4B in 2025.
• Estimated financial impact: Petitioner-alleged dumping margins typically 40-180%; cash deposits begin 90-120 days after preliminary.
• Recommended action: Pull 24-month entry data; identify alternates: Atlas Copco (Italy), KAESER (Germany), Hitachi (Japan), ELGi (India).
• Deadline: ITC preliminary June 15, 2026.
• Risk if ignored: Cash deposits could begin late July 2026 for Vietnam/Malaysia, late August 2026 for China.

Signal 3: Commerce Initiates CVD on Tin Mill Products from China

• What happened: Commerce initiated CVD on tin mill products (FR Doc 2026-08744, May 5, 2026).
• Who is affected: Importers of HS 7210.11/7210.12/7212.10 — food, aerosol, paint cans. Buyers: Crown, Ball, Silgan, Trivium.
• Estimated financial impact: Expected preliminary CVD margins 10-60% layered on existing 2024 AD/CVD.
• Recommended action: Lock Q3 contracts with JFE, Nippon, POSCO, Tata IJmuiden; notify can-line customers of 4-8% packaging cost risk.
• Deadline: Preliminary CVD mid-September 2026.
• Risk if ignored: Cans-makers face retroactive liability at preliminary determination.

Signal 4: Aluminum Foil Preliminary Results — Türkiye CVD and Oman AD

• What happened: Türkiye CVD preliminary affirmative (FR Doc 2026-08951); Oman AD preliminary affirmative for OARC (FR Doc 2026-08780).
• Who is affected: Importers of HS 7607.11/7607.19. Türkiye ~$190M (2024); Oman ~$140M.
• Recommended action: Submit case briefs ~June 5, 2026; re-quote with Hindalco, Lotte, ElvalHalcor, CBA.
• Deadline: Case briefs ~June 5, 2026; final results Q4 2026.
• Risk if ignored: Importers who do not appear inherit the all-others rate.

Signal 5: India Welded Stainless Pressure Pipe — Preliminary AD Affirmative

• What happened: Commerce found Suncity Metals & Tubes dumped welded stainless pressure pipe (FR Doc 2026-08953).
• Who is affected: Importers of HS 7306.40. India imports ~$95M in 2024.
• Recommended action: Re-quote with Ratnamani, Maharashtra Seamless, or shift to Korea/Taiwan; file entry of appearance.
• Deadline: Final results Q3 2026.
• Risk if ignored: Final-rate revisions can liquidate prior entries retroactively.

Signal 6: Multiple China Sunset-Review Continuations

• What happened: Continuations on passenger/light-truck tires (FR Docs 2026-08635, 2026-08634), wood mouldings (2026-08736, 2026-08737), and THFA (2026-08739).
• Who is affected: Tire importers (HS 4011.10), millwork (HS 4409, 4418), THFA (HS 2932.13).
• Recommended action: Update long-range models to assume continuation; do not budget termination relief.
• Risk if ignored: Buyers modeling 20% termination probability into 2027-2028 contracts overstate breakevens.

HS Code Watch List

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Reader note: CRITICAL on Section 301 reflects portfolio-wide exposure, not probable rate change. Air compressor and tin mill investigations are CRITICAL because cash deposits could begin within 90 days of preliminary determinations.

Product Category Deep Dives

Category 1: Industrial Air Compressors (HS 8414.80.16)

Current duty (2026-05-06): MFN 0%. China carries Section 301 List 3 25%. Malaysia/Vietnam: MFN only. No prior AD/CVD.

What's changing: ITC preliminary due June 15, 2026 (FR Doc 2026-08683). Commerce preliminary AD ~Aug 2026 (Vietnam/Malaysia), ~Sep 2026 (China NME).

Price impact model: Assuming preliminary AD lands at the 80% historical median for Chinese NME compressor cases, China-origin landed cost rises from 25% → ~105% over FOB. On a $3,500 FOB unit, landed cost rises from ~$4,375 to ~$7,175.

Sourcing alternatives:

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Action checklist: (1) By May 15: Pull POI entry data. (2) By May 30: RFQs to alternates. (3) By June 15: Have 90-day Chinese inventory landed/entered. (4) By July 15: Re-bid Q4 capital installs on non-subject sourcing. (5) By Aug 31: File entry of appearance.

Category 2: Aluminum Foil (HS 7607.11, 7607.19)

Current duty (2026-05-06): Türkiye CVD 2.62-7.69% all-others; Oman AD revised annually. Both face Section 232 25%. China: AD 96.81-176.20% + CVD 17.14-80.97% + S301 25%.

What's changing: Türkiye CVD preliminary affirmative (FR Doc 2026-08951); Oman AD preliminary affirmative for OARC (FR Doc 2026-08780). Final Q3-Q4 2026.

Price impact: Türkiye CVD final likely lands at preliminary — 1-3 ppt landed-cost swing. Oman: if OARC preliminary is 5-15%, landed cost rises 5-15% over FOB plus S232 25%. On $4,200/MT FOB Oman foil, landed rises from ~$5,250/MT to $5,460-$5,880/MT.

Sourcing alternatives:

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Action checklist: (1) By June 5: File case brief on Türkiye CVD. (2) By June 15: Re-quote Q3 with Indian/Korean producers. (3) By July 1: Update landed-cost models. (4) By August 1: Notify customers of 2-8% packaging cost adjustment. (5) Q3 2026: Re-run at final results.

Category 3: Tin Mill Products (HS 7210.11, 7210.12, 7212.10)

Current duty (2026-05-06): Chinese tin mill carries 2024 AD/CVD orders (~122% AD all-others; ~89% CVD all-others) + S232 25% + S301 25% — stacked landed cost ~261% over FOB.

What's changing: FR Doc 2026-08744 initiates a new CVD investigation likely targeting transshipment, post-2024 subsidy programs, or downstream tin-coated products. Preliminary CVD ~mid-Sep 2026.

Price impact: For products under 2024 AD/CVD, the new CVD adds 10-60 ppt. For products outside the 2024 scope, this could be first AD/CVD exposure, raising landed cost from MFN 0% + S232 25% + S301 25% (50%) to up to 150% over FOB.

Sourcing alternatives:

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Action checklist: (1) By May 20: Audit 2025-2026 imports for Chinese origin/transshipment. (2) By June 1: Lock Q4 contracts. (3) By July 1: Notify Crown, Ball, Silgan, Trivium of 4-8% packaging cost risk. (4) By August 15: File entry of appearance. (5) Mid-Sep: Be ready to post cash deposits within 15 days.

Strategic Analysis

The development: On May 6, 2026, USTR launched the second statutory four-year review of the Section 301 China actions (FR Doc 2026-08806). The first action was effective July 6, 2018 (List 1, $34B); modified by Lists 2 ($16B), 3 ($200B), 4A ($112B); and modified again by the 2024 four-year review. Continuation requires a written request from a benefitting domestic industry. The July 6, 2018 window opens May 7 and closes July 5, 2026. The August 23, 2018 window opens June 24 and closes August 22, 2026.

Historical parallel: In the first four-year review concluded in 2024, over 400 continuation requests were filed. USTR continued all four lists, modified rates upward on strategic categories (semiconductors 25%→50%; EVs 25%→100%; batteries 7.5%→25%), and opened a Phase 2 exclusion process granting 352 of 1,247 requests through 2025. Dispositive precedent: continuation is the base case with selective rate increases.

Stakeholder map: Continuation pushers — United Steelworkers, AISI, SMA, Coalition for a Prosperous America, Alliance for American Manufacturing, Semiconductor Industry Association, and a U.S. EV/battery alliance led by Ford, GM, Tesla, LG Energy Solution, Panasonic. Termination/scope-narrowing pushers — National Retail Federation, RILA, U.S. Chamber of Commerce, CTA, AAFA. Continuation politics align with Senate Finance and House Ways & Means Republican majorities plus steel-state Democrats (Brown, Fetterman). Termination advocates skew to Pacific Coast/Northeast urban Democrats and libertarian House Republicans.

Supply chain implications: Continuation through 2030 cements the post-2018 supply-chain reorganization as permanent. Vietnam's machinery export share to the U.S. has risen from 4.2% (2018) to 11.8% (2025). Tier-2/Tier-3 transshipment risk remains elevated, driving more aggressive Section 232 derivative-product probes. U.S. domestic capacity expansion in batteries, EV, semiconductors, and steel becomes financially viable on permanent tariff protection — IRA tax credits + Section 301 floor pricing yield IRRs justifying $80-150B incremental capex through 2028.

Three scenarios: Best case (10%) — USTR receives no continuation requests on selected sub-categories (List 4A consumer electronics), permitting partial termination on ~5-10% of dutiable value; ~$4-8B annual cost reduction. Base case (75%) — all four lists continue; selective rate increases on solar inverters, advanced semiconductor packaging substrates, rare earth magnets, certain EV components (up to 100%); modest exclusion process re-opens late 2026; net importer impact ~$5-10B incremental annual duties. Worst case (15%) — continuation plus broad rate-bracket expansion; Lists 3-4A floor raised to a uniform 30-40%; annual cost increase $25-40B. Probability rises if BOPGSTB widens through Q3 — March at -$60.31B is a directional warning.

The contrarian take: A meaningful subset of List 4A consumer goods (HS 8517 telecom, HS 9504 video game consoles, HS 9018 medical devices) lacks a credible domestic petitioner — the U.S. industry is too small or captive to global supply chains (Apple, HP, Dell). Watch List 4A line-item terminations carefully. Second contrarian angle: Phase 2 may extend Section 301-style rates to non-China origins exhibiting transshipment patterns — Vietnam steel, Malaysian solar, Mexican EVs. If that occurs, the ex-China sourcing thesis breaks.

Compliance Deadlines Calendar

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China LATAM EU APAC Trade Monitor

China: Heaviest China-targeted week of Q2 2026. Headline: USTR Section 301 second four-year review (FR Doc 2026-08806). Commerce initiated a new CVD on tin mill products (2026-08744) — second China-origin steel-derivative case in 30 days. Sunset reviews continued AD/CVD on passenger and light-truck tires (2026-08635, -08634) and wood mouldings (2026-08736, -08737). Commerce postponed preliminary determinations in truck bed covers (2026-08949) and graphite electrodes (2026-08952). Combined, this week reinforces a structural baseline of 25-100% effective duty rates across ~6,500 HTS lines. Vietnam captured 48% of incremental ex-China machinery exports in Q1 2026, Mexico 31%, India 12%.

Latin America: USMCA implications dominate. The PC steel wire strand sunset review (2026-08636) covers Argentina and Colombia — both face continuation for 5 more years. Q1 2026 IMPGS shows Mexico-origin imports rose ~7% YoY to ~$145B, while Vietnam-origin rose ~14%. Mexico's share of total U.S. imports stable at ~16% — the headline nearshoring narrative is real, but the marginal share gain is shifting to Vietnam and India. The Mexican steel transshipment monitoring framework under the 2024 USMCA enforcement protocol remains active. Expect Q3 2026 origin-of-content audits.

EU: Featured indirectly through Türkiye aluminum foil CVD preliminary (2026-08951) and the PC steel wire strand sunset review covering Italy, Netherlands, Spain (2026-08636). The Türkiye CVD pattern — first imposed 2021, confirmed at first sunset 2026 — is a template for future EU-adjacent steel/aluminum derivative cases. DTWEXBGS at 118.39 (May 1) weakened from the 119.10 late-April peak (0.6% USD softening), slightly improving EU exporter competitiveness. We continue to watch the suspended U.S.-EU Global Arrangement on Sustainable Steel and Aluminum.

APAC: Most active APAC week of Q2 2026. Air compressor AD/CVD names Vietnam and Malaysia alongside China (2026-08683) — clear escalation against Southeast Asia. Steel nails from Malaysia, Oman, Korea, Taiwan, Vietnam under sunset (2026-08509), Vietnamese nails carrying CVD margins as high as 313.97%. Welded line pipe from Korea and Türkiye also under sunset (2026-08514). Commerce's Taiwan stilbenic OBA AD final (2026-08957) and India welded stainless pressure pipe AD preliminary (2026-08953) round out the picture. Net: Southeast Asia's status as a Section 301 'safe haven' is eroding. Stress-test Vietnam/India sourcing against a 25-50% AD/CVD scenario in 2026-2027.

What Were Watching Next Week

1. May 7, 2026 — USTR Section 301 continuation window opens (List 1/2): Single most consequential trade-policy event of Q2 2026. Watch the first wave of continuation requests filed by domestic steel, semiconductor, and EV alliances on day one. Pace and breadth signal whether USTR fast-tracks Phase 2 with rate increases. Domestic producers — request ready to file at 12:01 AM ET May 7.

2. May 12, 2026 — BLS Import/Export Price Indexes for April 2026: March IR at 144.6 represents a +1.7% three-month rise. Above 145.5 confirms sustained tariff pass-through; at or below 144.0 suggests foreign-supplier absorption is intensifying.

3. May 14, 2026 — BEA International Trade in Goods and Services for March 2026 final: Advance March BOPGSTB at -$60.3B widened sharply. Confirmed widening of goods deficit with China beyond $33B intensifies pressure for Section 301 rate-bracket expansion.

4. June 5, 2026 — Case-brief deadline cluster (Türkiye foil CVD, Oman foil AD, India pressure pipe AD, Taiwan OBA final): Importers who do not file accept the all-others rate. Engage trade counsel by mid-May.

5. June 15, 2026 — ITC preliminary on air compressors from China, Malaysia, Vietnam: An affirmative determination starts the 90-day countdown to cash deposits. Inventory not landed and entered before mid-August is at-risk. Accelerate Q3 air-compressor purchase orders into Q2 entry.