USTR Opens Second Four-Year Review of 2018 Section 301 China Tariffs; Air Compressor AD/CVD Investigations Launch

Executive Summary

As of May 8, 2026, the single largest money-at-risk development is USTR's initiation of the second statutory four-year review of the original Section 301 tariffs on China (FR Doc 2026-08806), opening continuation, modification, or termination of duties currently covering roughly $370 billion in annual Chinese imports. The Tariff Tracker Desk flagged this as the dominant trade-policy event of Q2 2026: the continuation request window is May 7 to July 5, 2026 for the July 2018 action (Lists 1-2), and June 24 to August 22, 2026 for the August 2018 action (Lists 3-4A). If no domestic-industry petitioner files, duties terminate by operation of law.

We also flagged a cluster of fresh AD/CVD investigations. Commerce initiated AD and CVD on air compressors from China, Malaysia, and Vietnam (FR Doc 2026-08683, HS 8414.80.16) — ITC preliminary injury due June 15, 2026. Commerce initiated CVD on tin mill products from China (FR Doc 2026-08744). Five five-year sunset reviews were instituted May 1, 2026: steel grating from China (FR Doc 2026-08510), steel nails from Malaysia/Oman/South Korea/Taiwan/Vietnam (FR Doc 2026-08509), welded line pipe from South Korea/Turkey (FR Doc 2026-08514), carbazole violet pigment 23 from China/India (FR Doc 2026-08508).

Macro context reinforces urgency. Import Price Index reached 144.6 in March 2026 (FRED IR), up from 143.5 (Feb) and 142.2 (Jan) — +1.7% three-month trend. PPI Manufacturing surged to 265.27 (FRED PCUOMFGOMFG), a +3.15% month-over-month jump. Trade deficit widened to -$60.3B in March (FRED BOPGSTB) from -$57.8B in February — third consecutive deterioration.

This week, you should: (1) File a Section 301 continuation request by July 5, 2026 if your domestic operations benefit from List 1 or List 2 duties; (2) Audit air-compressor SKUs under HS 8414.80.16 from China/Malaysia/Vietnam and prepare cash deposits; (3) File ITC notices of appearance by May 31, 2026 in the five sunset reviews.

The Week In Numbers

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Key reading: PPI Manufacturing's +3.15% single-month move is the largest since November 2025's 254.53 print — domestic producers are repricing, which historically precedes a wave of AD petitions. The Trade Weighted Dollar declined to 118.39 from a 119.10 peak on April 29; sustained weakening below 117 would amplify duty pass-through into landed cost by 1-2%.

Key Signals This Week

Signal 1 — USTR Section 301 Four-Year Review Initiated

• What happened: USTR commenced the second four-year review of Section 301 actions effective July 6, 2018 and August 23, 2018 (FR Doc 2026-08806). Continuation requests for the July 2018 action: May 7 to July 5, 2026; for the August 2018 action: June 24 to August 22, 2026.
• Who is affected: Importers of any HTS subheading on Lists 1-4A — HS 8471 (computers), 8517 (telecom), 8528 (monitors), 8542 (semiconductors), 8703 (vehicles), apparel Chs. 61-62, footwear Ch. 64, electronics Ch. 85.
• Estimated financial impact: ~$370B in annual Chinese imports at 7.5-25% rates. Continuation locks rates four more years.
• Recommended action: Domestic producers — file continuation request via USTR portal by July 5, 2026. Importers — prepare a public-comment package with pass-through pricing evidence.
• Deadline: July 5, 2026 (List 1-2); August 22, 2026 (List 3-4A).
• Risk if ignored: Domestic producers face automatic termination; importers face four more years of locked-in 7.5-25% duties.

Signal 2 — Air Compressor AD/CVD Investigations

• What happened: ITC instituted preliminary AD/CVD on air compressors from China, Malaysia, Vietnam under HS 8414.80.16 (FR Doc 2026-08683). Inv. Nos. 701-TA-794-796 (CVD), 731-TA-1790-1792 (AD).
• Who is affected: Industrial compressor distributors, HVAC OEMs, automotive aftermarket, construction-equipment importers.
• Estimated financial impact: HS 8414.80 imports from these three countries totaled ~$1.2B in 2024-2025. Anticipate 25-50% combined cash deposit.
• Recommended action: Pre-position 90 days of safety stock. File ITC notice of appearance by May 25, 2026. Quote Indian, Italian, German alternatives.
• Deadline: ITC preliminary by June 15, 2026; Commerce CVD prelim late July; AD prelim mid-August.
• Risk if ignored: Non-participants receive the all-others rate, often the highest petitioner-alleged margin.

Signal 3 — Tin Mill Products CVD Initiation (China)

• What happened: Commerce initiated CVD on tin mill products from China (FR Doc 2026-08744), pairing with the AD initiated February 2026. HS 7210.11/12/50/70, 7212.10/40/50.
• Who is affected: Can manufacturers (food, aerosol, paint), battery-casing producers, metal packaging integrators.
• Estimated financial impact: Tin mill imports from China ~$310M in 2025. Combined AD/CVD could reach 80-160%.
• Recommended action: Convert tin mill orders to non-Chinese origin within 60 days. Suppliers: Cleveland-Cliffs, USS, Tata Steel, Baosteel Brazil, JFE.
• Deadline: ITC preliminary injury late June 2026; Commerce CVD preliminary mid-September 2026.
• Risk if ignored: Cash deposits at entry plus potential critical circumstances finding applying duties retroactively 90 days.

Signal 4 — Wood Mouldings Sunset Continuation (China)

• What happened: Commerce expedited sunset review found revocation of AD/CVD orders on Chinese wood mouldings would lead to recurrence (FR Docs 2026-08737, 08736). CVD admin review prelim May 8 (FR Doc 2026-09218).
• Who is affected: Home builders, kitchen-cabinet OEMs, commercial millwork. HS 4409.10, 4409.22, 4409.29, 4418.99.
• Estimated financial impact: AD 25.62-372.65% and CVD 20.56-251.91% stay in force through ~2031.
• Recommended action: Shift remaining Chinese millwork to Malaysia, Indonesia, Brazil.
• Deadline: Final continuation determination June 2026.
• Risk if ignored: 8-15% gross-margin erosion versus diversified competitors.

Signal 5 — Five-Year Sunset Reviews on Steel and Pigments

• What happened: ITC instituted sunset reviews on (i) steel nails from Malaysia/Oman/South Korea/Taiwan/Vietnam (FR Doc 2026-08509); (ii) welded line pipe from South Korea/Turkey (FR Doc 2026-08514); (iii) steel grating from China (FR Doc 2026-08510); (iv) carbazole violet pigment 23 from China/India (FR Doc 2026-08508).
• Who is affected: Construction fastener distributors, oil/gas line-pipe procurement, industrial flooring contractors, ink/coatings formulators.
• Estimated financial impact: Combined imports under continuing orders >$2.1B annually.
• Recommended action: File ITC notice of appearance by May 31, 2026. Domestic producers must file substantive responses within 45 days.
• Deadline: May 31, 2026.
• Risk if ignored: Loss of standing; order continues by default.

Signal 6 — Aluminum Foil Cluster (Brazil, Türkiye, Oman)

• What happened: Preliminary AD on Brazilian foil (FR Doc 2026-09017), preliminary CVD on Turkish foil (FR Doc 2026-08951), preliminary AD on Omani foil (FR Doc 2026-08780). HS 7607.11, 7607.19.
• Who is affected: Food-packaging converters, pharma blister-pack producers, HVAC fin-stock buyers.
• Estimated financial impact: Margin disclosures (1.5-12% AD, 0.5-8% CVD) stack onto existing China and Korea orders.
• Recommended action: Diversify to India, Bahrain, Argentina, South Africa — none currently subject to U.S. trade remedies on foil.
• Deadline: Comments due 30 days from publication.
• Risk if ignored: Cash-deposit obligations on entries from Brazil/Türkiye/Oman after preliminary determination.

Signal 7 — THFA Continuation & PATRIOT Act Tobacco Rule

• What happened: Commerce continued the AD order on tetrahydrofurfuryl alcohol from China (FR Doc 2026-08739, HS 2932.13) at 129.54-198.99% rates. ATF final rule (FR Doc 2026-09160) drops contraband cigarette trafficking threshold from 60,000 to 10,000, effective June 8, 2026.
• Who is affected: Specialty chemical distributors, agrochemical formulators (THFA); tobacco wholesalers, distributors, retailers (Ch. 24).
• Estimated financial impact: THFA — triple-digit AD through 2031. Tobacco compliance cost $50K-$150K; criminal exposure floor reduced sixfold.
• Recommended action: Lock in Indian/Italian THFA. Update CCTA recordkeeping before June 8, 2026.
• Deadline: THFA — immediate. Tobacco — June 8, 2026.
• Risk if ignored: Continued triple-digit AD on THFA. Federal felony exposure for smaller tobacco transactions.

HS Code Watch List

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Product Category Deep Dives

Category 1 — Air Compressors (HS 8414.80.16)

Current duty (May 8, 2026): MFN free to 2.7%; Section 301 List 3 of 25% on China; no AD/CVD before this week.

What's changing: ITC preliminary injury due June 15, 2026 (FR Doc 2026-08683). Commerce CVD prelim late July; AD prelim mid-August.

Price impact: Base landed cost $400/unit for 7.5HP compressor from China at $310 FOB plus 25% Section 301 plus freight. Adding 35% combined AD/CVD lifts landed cost to $508 (+27%). For 5,000 units/year = $540,000 incremental duty cost.

Sourcing alternatives:

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Action checklist: (1) By May 25: File ITC notice of appearance. (2) By June 1: Submit RFQs to Indian and Italian suppliers. (3) By June 15: Pre-position 90 days of safety stock. (4) By July 31: Negotiate 2027 contracts with two non-investigated suppliers.

Category 2 — Tin Mill Products (HS 7210.11/12/50/70)

Current duty: MFN 0%; Section 232 of 25%; Section 301 List 3 of 25% on China; AD initiated Feb 2026, CVD initiated this week (FR Doc 2026-08744).

Price impact: Base $1,200/MT from China = ~$750 FOB + 25% Section 232 + 25% Section 301 + freight. Adding 30% CVD plus 75% AD lifts landed cost to ~$2,135/MT (+78%). For 10,000 MT/year = $13.85M incremental cost.

Sourcing alternatives: United States (Cleveland-Cliffs, USS — none, 4-6 wk); Netherlands (Tata Steel — 25% Section 232 or quota, 8-10 wk); Japan (JFE, Nippon — 25% Section 232 plus 0.04% AD, 10-12 wk); Brazil (Baosteel BR — 25% Section 232, 6-8 wk).

Action checklist: (1) By May 30: Convert 30% of 2026 volume to U.S. domestic. (2) By June 15: Lock Brazilian or Dutch supply for H2. (3) By August 31: Stress-test margin under +80% landed cost.

Category 3 — Wood Mouldings & Millwork (HS 4409.10/4418.99)

Current duty: AD 25.62-372.65%, CVD 20.56-251.91% on Chinese imports. Section 301 List 4A of 7.5% layered on top.

What's changing: Both orders confirmed continuing (FR Docs 2026-08737, 08736). Admin review prelim May 8 (FR Doc 2026-09218).

Price impact: Status quo ~5 more years. Importers from China face multi-hundred-percent landed cost premium.

Sourcing alternatives: Malaysia, Indonesia, Brazil, Vietnam (no AD/CVD, free MFN, 5-8 wk); Chile (USFTA 0%, 4-6 wk).

Action checklist: (1) By May 30: Cancel speculative orders. (2) By June 30: Confirm AD/CVD bond coverage. (3) By August 31: Phase out Chinese-origin millwork — target zero by year end.

Strategic Analysis

The Development. USTR's notice of initiation of the second four-year review of Section 301 China actions (FR Doc 2026-08806) is a procedural milestone with profound substantive consequences. Section 307(c) of the Trade Act of 1974 requires USTR to terminate Section 301 actions four years after initial imposition unless representatives of domestic industries that benefit request continuation. The first action — Lists 1 ($34B) and 2 ($16B) — became effective July 6, 2018. The first four-year review concluded in 2024 with continuation plus modification. The continuation request window for the July 2018 action is open May 7 to July 5, 2026.

Historical Parallel. In 2024 (Docket No. USTR-2022-0014), USTR received continuation requests from over 600 domestic firms across steel, aluminum, semiconductors, solar, batteries, EVs, ship-to-shore cranes, syringes, and PPE. The first review delivered continuation plus expansion: certain rates raised to 50% (semiconductors, solar wafers) or 100% (EVs), with limited exclusions granted. No tranche was terminated. That outcome established a template — continuation with selective rate hikes — we expect to dominate 2026-2027 absent dramatic political shift. Secondary parallel: the 2024 Section 232 four-year review kept 25% steel duties and raised aluminum to 25% from 10%.

Stakeholder Map. Continuation side: AISI, Aluminum Association, Semiconductor Industry Association (mixed), Alliance for American Manufacturing, Coalition for a Prosperous America, SEMA Coalition, United Steelworkers, AFL-CIO, Cleveland-Cliffs, Nucor, U.S. Steel, First Solar, Hemlock Semiconductor, MP Materials. Termination side: National Retail Federation, FDRA, Consumer Technology Association, AAFA, ITI, plus Walmart, Target, Best Buy, Costco, Apple.

Supply Chain Implications. First-order: continuation locks duty structure four more years. Second-order: continuation accelerates China-Plus-One — capacity shifts to Vietnam, Malaysia, India, Mexico — creating bottlenecks. Third-order: AD/CVD circumvention findings increase as Chinese material is rerouted; 2025-2026 saw 14 circumvention inquiries, up from 8 in 2023.

Three Scenarios.

Best case for importers (15%): USTR terminates List 1 or 2 in late 2026 due to insufficient petitioning, delivering ~$10-15B annual savings. Unlikely given 2024 precedent.

Base case (65%): Continuation with selected rate increases on strategic-sector goods (additional EV components, machinery, advanced semis). Existing exclusions extended through 2028. Lists 3 and 4A continued without major changes.

Worst case (20%): Continuation with broad rate increases beyond current scope; exclusion processes restricted. Average effective tariff on Chinese imports rises from ~19% to 25-28%, compressing margins for consumer electronics, textiles, discretionary goods.

The Contrarian Take. Consensus assumes continuation is foregone. The contrarian view: 2026 occurs in a different macro context — Import Price Index 144.6 in March (+3.0% YoY), trade deficit widened to -$60.3B, PPI Manufacturing surged +3.15% MoM. Cumulative inflation pressure may motivate aggressive product-exclusion expansion as a political safety valve, even while headline duties remain. In 2018-2020, the Section 301 exclusion process delivered ~$19B in retroactive refunds. Smart importers will treat this review as the most consequential exclusion-petitioning window of the decade, with discipline to file by close of comment phase (likely Q1 2027).

Compliance Deadlines Calendar

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China LATAM EU APAC Trade Monitor

China. This week's China-related actions form the densest cluster since the original Section 301 imposition in 2018. Nine separate Federal Register filings touch Chinese-origin goods: Section 301 four-year review (FR Doc 2026-08806), tin mill CVD (FR Doc 2026-08744), wood mouldings sunset continuations (FR Docs 2026-08737, 08736), wood mouldings admin review (FR Doc 2026-09218), tetrahydrofurfuryl alcohol continuation (FR Doc 2026-08739), steel grating sunset (FR Doc 2026-08510), carbazole violet review (FR Doc 2026-08508), graphite electrodes postponement (FR Doc 2026-08952), truck bed covers postponement (FR Doc 2026-08949). Pattern: maintained pressure on steel-adjacent and chemical sectors. U.S. imports from Vietnam in HS Ch. 84 reached $31.8B in 2025 (vs. $14.2B in 2018); Mexico HS Ch. 84 imports climbed to $54.6B in 2025.

Latin America. Aluminum foil from Brazil received preliminary AD findings (FR Doc 2026-09017) — first AD action against Brazilian foil since 2018 Section 301 triggered regional displacement. USMCA: no direct actions, but Mexico nearshoring continues. Expect a Mexican-origin steel circumvention filing in Q3 2026 given 5 ongoing inquiries. Importers using Mexican rolling capacity should document substantial transformation evidence (mill certificates, melt-and-pour records).

EU. Strontium chromate from France preliminary AD review found no dumping by Société Nouvelle des Couleurs Zinciques during 2023-2024 POR (FR Doc 2026-09220) — constructive for European specialty chemicals. Aluminum foil from Türkiye prelim CVD (FR Doc 2026-08951) and welded line pipe sunset on Turkey (FR Doc 2026-08514) maintain Turkish exposure. CBAM Q1 2026 emissions reporting due August 31, 2026 for U.S. firms re-exporting to the EU.

APAC. Three APAC actions: thermal paper from South Korea — no dumping (FR Doc 2026-09132); CTL plate from South Korea final AD with sales below normal value (FR Doc 2026-09131); welded stainless pressure pipe from India preliminary AD (FR Doc 2026-08953). Stilbenic optical brighteners from Taiwan confirmed dumping by Teh Fong Min International (FR Doc 2026-08957). Air compressor petition includes Malaysia and Vietnam alongside China — the Southeast Asia displacement strategy is itself drawing AD/CVD scrutiny. Importers eyeing Indonesia or Bangladesh should expect trade-remedy follow-on within 18-24 months.

What Were Watching Next Week

1) ITC Air Compressor Questionnaires — Week of May 11

Why it matters: Questionnaires land with importers and producers; expect 30-day response windows.

Prepare: Sales, import volume, and pricing data for HS 8414.80.16 covering 2023-2025. Engage trade counsel.

2) USTR Section 301 First-Wave Continuation Filings — May 11+

Why it matters: Earliest filings reveal industry commitment; filing patterns predict outcome.

Prepare: Monitor USTR.gov daily. Domestic producers should finalize continuation request packages.

3) FRED Import Price Index April 2026 — May 14, 2026 (8:30 AM ET)

Why it matters: A second consecutive month above 144 confirms duty pass-through. Watching >+0.5% m/m as elevated-alarm threshold.

Prepare: Pre-position pricing review meetings. Update gross-margin sensitivity models.

4) PPI Manufacturing April 2026 — May 15, 2026

Why it matters: After +3.15% March surge, an April print above 268 suggests structural producer pricing power and triggers new AD petitions. Below 263 = transitory.

Prepare: Update domestic-vs-import sourcing breakeven analyses.

5) Commerce Tin Mill AD Preliminary — Mid-May 2026

Why it matters: AD prelim may come before September CVD prelim. Importers should expect cash-deposit requirements as early as late May 2026.

Prepare: Pre-clear inventory entry, finalize non-Chinese contracts, ensure surety bond capacity for potential 50-122% AD cash deposit on in-transit Chinese cargo.