Commerce plans to slap duties of 59.31% on aluminium extrusions after determining that the Chinese-made products are being sold below fair value in the US.

Once a final decision is made early next year, the duties will not go into effect unless the independent International Trade Commission determines that US producers of the paper are being hurt by the imports.

The aluminium case is one of the more high-profile disputes between the countries.

In retaliation for other unfair subsidies, Commerce set countervailing duties of 6.2% to 137.7% on the aluminium imports. Imports from the world’s largest exporter of the extrusions jumped to $513.6M in 2009 from $306.8M the year before.

The antidumping decision represents a win for US aluminium companies that petitioned as part of the Aluminum Extrusions Fair Trade Committee, as well as the United Steelworkers union.

The EU also announced anti-dumping duties on aluminium wheels imported from China.