Mexico Imposes Provisional Anti-Dumping Duties on Hot-Rolled Steel from China and Vietnam: Full Rate Schedule, HS Codes, and Procurement Impact

Effective date and legal basis

Mexico's Secretaría de Economía announced the provisional anti-dumping measures on 23 March 2026. They take effect immediately upon publication in the Diario Oficial de la Federación — Mexico's official government gazette. Under Mexican trade remedy law, provisional duties apply for up to four months. This window covers the period pending conclusion of the full investigation and the determination of definitive duty rates. Importers should treat the provisional rates as the operative commercial framework for all shipments cleared into Mexico during this period.

The investigation was formally initiated in March 2025. The complainant was Ternium, one of Mexico's principal flat steel producers. The twelve-month interval between initiation and provisional measures is standard under Mexican trade remedy law. The Ministry of Economy must complete a preliminary injury and dumping determination before applying provisional relief.

Products covered and HS code classification

The measures cover hot-rolled flat steel products in coil and non-coil form. They span a broad range of carbon and alloy flat-rolled categories. The product scope is defined by twenty specific tariff sub-headings under Chapter 72 of Mexico's TIGIE schedule. Importers must verify each line item against the exact HS classification declared at the Mexican customs border. Misclassification at the sub-heading level can result in incorrect duty application or retroactive adjustment.

Provisional duty rates by exporter and origin

The Ministry of Economy has applied a differentiated duty structure, assigning specific rates to named producers that cooperated with the investigation and a residual rate to non-cooperating or unreviewed exporters. This structure is standard practice in Mexican anti-dumping proceedings and reflects the Ministry's obligation under WTO Anti-Dumping Agreement Article 6 to calculate individual margins wherever practicable. The rates below are expressed in US dollars per kilogram of imported product.

The residual rate for non-cooperating Chinese exporters matches the highest named rate — US$0.2304/kg. This is a standard penalty for non-participation in Mexican AD proceedings. It creates a direct commercial incentive for exporters to engage in any subsequent administrative review. The Vietnamese rates are lower than the Chinese schedule. This reflects the preliminary dumping margin calculation rather than any policy preference.

Impact on Chinese exporters and overseas buyers

Cost impact for exporters

The provisional measures raise the landed cost of Chinese hot-rolled steel entering Mexico by US$0.2160–0.2304 per kilogram. At current export prices, this eliminates most of the price advantage Chinese material held over domestically produced Mexican steel. It also removes the gap relative to imports from origins not subject to AD duties.

Immediate priorities for importers

Mexican importers sourcing from China or Vietnam must reassess landed cost models now. The provisional duties apply to all shipments cleared after the measures take effect. In practical terms, four issues require immediate attention:

• Shipments already in transit may be subject to provisional rates depending on the customs entry date. Confirm the applicable entry date with a licensed Mexican customs broker (agente aduanal) without delay.
• Open purchase orders for future Mexican deliveries now carry a different landed cost than at the time of booking. Calculate the duty impact per kilogram against contracted prices. Determine whether existing terms remain commercially viable.
• Non-cooperating exporters face the highest rate. Any Chinese exporter not named in the provisional determination is subject to US$0.2304/kg — the ceiling of the Chinese schedule. Buyers sourcing from smaller mills should verify whether their supplier holds a named rate or falls into the residual category.
• The four-month window is the adjustment timeline. Definitive rates may differ from provisional ones. Do not assume the provisional schedule represents the final commercial risk. The definitive determination carries equal importance for medium-term supply planning.

Broader market context

These measures fit a wider global pattern. Mexico now joins the US, EU, UK, India, and Brazil in operating an active trade remedy regime for flat carbon steel. For procurement teams with multi-market sourcing programmes, the cumulative effect is increasingly significant. Both cost structures and supply chain configurations are affected.

Alternative sourcing considerations

Buyers affected by these measures have several response options. The right choice depends on grade, application, and volume requirements.

Origin and supply alternatives

• Switch to non-subject origins. Hot-rolled flat steel from Japan, South Korea, India, Taiwan, and certain EU member states is not subject to these provisional duties. Evaluate whether specifications and delivery requirements can be met from these origins within acceptable cost parameters.
• Source from domestic Mexican producers. Ternium operates flat steel production capacity within Mexico. Domestic procurement eliminates import duty exposure entirely. It may also qualify for preferential treatment under government programmes that prioritise domestic content. Confirm lead times and availability before committing.

Specification and legal options

• Review material selection for corrosion-critical uses. In applications where carbon steel was chosen primarily on cost, and where the service environment involves corrosion, elevated temperature, or hygiene requirements, a stainless upgrade may now be cost-competitive. The AD duty impact on carbon steel landed cost narrows the gap. TISCO's 304 stainless steel coil and 316L stainless steel coil serve food processing, chemical handling, architectural cladding, and marine applications.
• Request an administrative review. Chinese exporters subject to provisional measures have the right to participate in the ongoing investigation. They may request an individual dumping margin calculation. This is a matter for the exporting producer and their trade counsel. Buyers relying on specific named suppliers should monitor the investigation outcome closely.

Related products and further reading

For procurement teams reviewing material selection in light of these measures, the following TISCO resources provide product specifications, grade selection guidance, and application references:

Official references (external)

Secretaría de Economía — Mexico  |  Diario Oficial de la Federación  |  WTO — Anti-Dumping Agreement  |  World Steel Association

© tiscoco.com | Stainless steel market insights and procurement guidance. Duty rates and HS codes referenced in this article are sourced from the official announcement by Mexico's Secretaría de Economía as of the publication date. Importers should verify applicable rates with a licensed Mexican customs broker (agente aduanal) before making procurement decisions. This article does not constitute legal or customs advisory.