The US Commerce Department has ratcheted up tariffs on Nippon Steel Corp. just as the Japanese steelmaker made an anti-import promise to gain support for its $14.1 billion takeover of United States Steel Corp.

The Commerce Department imposed a dumping margin of 29% on Nippon Steel for selling hot-rolled steel in the US at prices below normal value from October 2022 through September 2023, according to a preliminary ruling published to the Federal Register. The Nov. 13 decision was part of the department’s annual administrative review of a dumping case that has existed since 2016, when the four major US steelmakers first filed the complaint.

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