China has filed a complaint with the World Trade Organisation over the way the US and Europe use anti-dumping rules against it.
Countries that sell exports below their cost of production – usually to get market share – have to pay duties as punishment.
But Beijing says its rates should now be reduced because China has been a WTO member for 15 years.
The US has signalled there would be no change in its approach.
And the European Commission said China’s legal challenge was a “regret” given a proposal to change the way it calculated the duties on China was awaiting approval from the EU’s 28 members.
Authorities in Washington and Brussels are keen to preserve tough rules prevent cheap Chinese products flooding their markets.