The US Commerce Department said on Wednesday it imposed duties on Chinese and Mexican structural steel after making a preliminary determination that producers in both countries had dumped fabricated structural steel on the US market at prices below fair market value.

Commerce said it had found that imports of Canadian fabricated structural steel did not violate US anti-dumping laws.Most Chinese steel products have largely been excluded from the US market by prior Commerce Department anti-dumping duties and President Donald Trump’s 25 percent punitive tariffs. The latest order seeks to prevent Chinese downstream structural steel assemblies from skirting those duties and entering the United States.

Commerce found that one Chinese producer, Modern Heavy Industries Co Ltd, did not dump product into the United States, but it imposed dumping rates of 52% on Wison Heavy Industry Co Ltd and up to 141% on other Chinese fabricators.

The department is scheduled to release final anti-dumping duties in its fabricated structural steel investigation on or about Jan. 24, 2020. The US International Trade Commission needs to find that American steel fabricators suffered injury from Chinese and Mexican imports for the duties to be locked in place for a five-year period.

Mexico’s Economy Ministry said the duties imposed on some Mexican structural steel are part of a “normal investigation when an industry feels it is being affected by imports that use unfair practices, such as dumping or subsidies.”

It also underscored that the new duties have no relation to 25% tariffs on imported steel and 10% tariffs on imported aluminum that Trump imposed in March 2018 based on national security grounds. Mexico was exempted from those tariffs in May.