China files trade complaint against U.S. over steel, aluminum tariffs

China has filed a World Trade Organization complaint challenging U.S. President Donald Trump's tariff hike on imported steel and aluminum, the trade body said Tuesday.

The tariff spat is one element of a wide-ranging trade dispute between Trump and Chinese President Xi Jinping's government. Trump also has threatened to increase duties on $50 billion US in Chinese goods in a separate conflict over technology policy.

China has requested 60 days of consultations with the United States on the steel and aluminum dispute, according to the WTO. If that fails, the next step could be for Beijing to request a ruling from a panel of trade experts.

Beijing says Trump's decision to impose additional duties of 25 per cent on steel and 10 per cent aluminum violate international trade rules.

Steel and aluminum are among the Chinese industries in which supply exceeds demand. China's trading partners complain its mills are exporting their surplus at improperly low prices, threatening jobs in the United States and Europe.

The United States buys little Chinese steel and aluminum following earlier tariff hikes meant to offset what Washington says are improper subsidies to producers. But economists said Beijing responded in order to show it would defend itself.

China's government issued a $3-billion list of U.S. goods, including pork, apples and steel pipes, on March 23 that it said might be targeted for retaliation if Trump fails to negotiate a settlement to the dispute over steel and aluminum charges.