SUPPLEMENTARY INFORMATION:

Background

On March 10, 2026, Commerce published in the Federal Register the preliminary results of the 2023-2024 administrative review ^[1] of the antidumping duty order on heavy walled rectangular welded carbon steel pipes and tubes from Mexico,^[2] covering two mandatory respondents, Forza and Prolamsa, and five non-examined companies. From April 13, 2026, to April 17, 2026, Commerce verified Prolamsa's questionnaire responses at Prolamsa's facility in Monterrey, Mexico, and from June 12, 2026, to June 14, 2026, Commerce verified the questionnaire responses of Prolamsa's U.S. affiliate, Prolamsa, Inc., in Houston, Texas.^[3] On May 14, 2026, we extended the deadline for the final results until August 28, 2026.^[4] We invited parties to comment on the Preliminary Results and verification report.

For a complete description of the events that occurred since the Preliminary Results, see the Issues and Decision Memorandum.^[5] The Issues and Decision Memorandum is a public document and is on file electronically via Enforcement and Compliance's Antidumping and Countervailing Duty Centralized Electronic Service System (ACCESS). ACCESS is available to registered users at https://access.trade.gov. In addition, a complete version of the Issues and Decision Memorandum can be accessed directly at https://access.trade.gov/​frnotices.

Commerce conducted this administrative review in accordance with section 751 of the Tariff Act of 1930, as amended (the Act).

Scope of the Order

The merchandise subject to the Order is heavy walled rectangular welded carbon steel pipes and tubes from Mexico. A full description of the scope of the Order is contained in the Issues and Decision Memorandum.

Analysis of Comments Received

All issues raised in the case and rebuttal briefs are addressed in the Issues and Decision Memorandum and are listed in Appendix I.

Changes Since the Preliminary Results

Based on a review of the record and comments received from interested parties regarding our Preliminary Results, and for the reasons explained in the Issues and Decision Memorandum, Commerce made certain revisions to the preliminary weighted-average dumping margin calculation programs for Forza and Prolamsa.^[6] As a result of the revisions, the weighted-average dumping margin changed for Prolamsa and the companies not selected for individual examination. Although revisions were made for Forza, the final weighted-average dumping margin did not change. For a discussion of these changes, see the Issues and Decision Memorandum.

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Rates for Non-Examined Companies

The Act and Commerce's regulations do not address the establishment of a weighted-average dumping margin to be determined for companies not selected for individual examination when Commerce limits its examination in an administrative review pursuant to section 777A(c)(2) of the Act. Generally, Commerce looks to section 735(c)(5) of the Act, which provides instructions for calculating the all-others rate in an investigation, for guidance when determining the weighted-average dumping margin for companies which were not selected for individual examination in an administrative review.

Section 735(c)(5)(A) of the Act provides that Commerce will base the all-others rate on the weighted average of the estimated weighted-average dumping margins calculated for the individually examined respondents, excluding rates that are zero, de minimis, or based entirely on facts available. Where the estimated weighted-average dumping margin for each of the individually examined companies is zero, de minimis, or based entirely on facts available, section 735(c)(5)(B) of the Act provides that Commerce may use “any reasonable method to establish the estimated all-others rate for exporters and producers not individually investigated, including averaging the estimated weighted-average dumping margins determined for the exporters and producers individually investigated.”

In this review, we calculated weighted-average dumping margins for Forza and Prolamsa that are not zero, de minimis, or based entirely on facts otherwise available. In accordance with section 735(c)(5)(A) of the Act, we are assigning to the companies under review that were not selected for individual examination a weighted-average dumping margin equal to the weighted average of the estimated weighted-average dumping margins calculated for Forza and Prolamsa, weighted by the mandatory respondents' publicly ranged total sales values.^[7] The companies not selected for individual examination are listed in Appendix II.

Final Results of Review

As a result of this review, we determine that the following estimated weighted-average dumping margin exist for the period September 1, 2023, through August 31, 2024:

Disclosure

Commerce intends to disclose the calculations performed in connection with these final results of review to parties in this review within five days after public announcement of the final results or, if there is no public announcement, within five days of the date of publication of this notice in the Federal Register , in accordance with 19 CFR 351.224(b).

Assessment Rates

Pursuant to section 751(a)(2)(C) of the Act, and 19 CFR 351.212(b)(1), Commerce has determined, and U.S. Customs and Border Protection (CBP) shall assess, antidumping duties on all appropriate entries of subject merchandise in accordance with the final results of this review.

Pursuant to 19 CFR 351.212(b)(1), we calculated importer-specific ad valorem duty assessment rates based on the ratio of the total amount of dumping calculated for the examined sales to the total entered value of the sales. Where either the respondent's weighted-average dumping margin is zero or de minimis, within the meaning of 19 CFR 351.106(c)(1), or an importer-specific rate is zero or de minimis, we will instruct CBP to liquidate the appropriate entries without regard to antidumping duties.

Commerce's “automatic assessment” will apply to entries of subject merchandise during the POR produced/exported by Forza or Prolamsa in these final results of review for which the reviewed companies did not know that the merchandise it sold to the intermediary ( e.g., a reseller, trading company, or exporter) was destined for the United States. In such instances, we will instruct CBP to liquidate unreviewed entries at the all-others rate if there is no rate for the intermediate company(ies) involved in the transaction.

Commerce intends to issue assessment instructions to CBP no earlier than 41 days after the date of publication of the final results of this review in the Federal Register , in accordance with 19 CFR 356.8(a). If a timely summons is filed at the U.S. Court of International Trade, the assessment instructions will direct CBP not to liquidate relevant entries until the time for parties to file a request for a statutory injunction has expired ( i.e., within 90 days of publication).

Cash Deposit Requirements

Upon publication of this notice in the Federal Register , the following cash deposit requirements will be effective for all shipments of the subject merchandise entered, or withdrawn from warehouse, for consumption on or after the publication date of the final results of this administrative review, as provided by section 751(a)(2)(C) of the Act: (1) the cash deposit rate for the companies subject to this review will be equal to the weighted-average dumping margin established in the final results of this review; (2) for merchandise exported by producers or exporters not covered in this review but covered in a prior completed segment of the proceeding, the cash deposit will continue to be the company-specific rate published in the completed segment for the most recently completed period; (3) if the exporter is not a firm covered in this review, a prior review, or the original less-than-fair-value (LTFV) investigation, but the producer has been covered in a prior completed segment of this proceeding, then the cash deposit rate will be the rate established in the completed segment for the most recent period for the producer of the merchandise; and (4) the cash deposit rate for all other producers or exporters will continue to be 4.91 percent, the all-others rate established in the LTFV investigation for this proceeding.^[9] These cash deposit requirements, when ( printed page 56636) imposed, shall remain in effect until further notice.

Notification to Importers

This notice serves as a final reminder to importers of their responsibility under 19 CFR 351.402(f)(2) to file a certificate regarding the reimbursement of antidumping duties prior to liquidation of the relevant entries during this review period. Failure to comply with this requirement could result in Commerce's presumption that reimbursement of antidumping duties occurred and the subsequent assessment of double antidumping duties.

Notification Regarding Administrative Protective Order (APO)

This notice serves as the only reminder to parties subject to an APO of their responsibility concerning the disposition of proprietary information disclosed under APO in accordance with 19 CFR 351.305(a)(3), which continues to govern business proprietary information in this segment of the proceeding. Timely written notification of return/destruction of APO materials or conversion to judicial protective order is hereby requested. Failure to comply with the regulations and the terms of an APO is a violation subject to sanction.

Notification to Interested Parties

We are issuing and publishing this notice in accordance with sections 751(a)(1) and 777(i) of the Act, and 19 CFR 351.221(b)(5).

Appendix I

List of Topics Discussed in the Issues and Decision Memorandum

I. Summary

II. Background

III. Scope of the Order

IV. Changes Since the Preliminary Results

V. Discussion of Issues

Comment 1: Whether To Adjust the Denominator Used to Calculate General and Administrative and Interest Expense Ratios to Account for Scrap Offsets

Comment 2: Whether To Revise Prolamsa's Cost Database to Reflect Certain Updates from Prolamsa's Supplemental Questionnaire Responses

Comment 3: Whether To Grant Forza a Constructed Export Price Offset

VI. Recommendation

Appendix II

Companies Not Selected for Individual Examination

1. Buffalo Tube S.A. de C.V.

2. Fortacero S.A. de C.V.

3. Maquilacero S.A. de C.V.

4. Perfiles y Herrajes LM S.A. de C.V.

5. Regiomontana de Perfiles y Tubos S.A. de C.V.