Police said about 5,200 representatives from Europe's struggling steel industry circled the EU's Berlaymont headquarters demanding that China be denied market-economy status, an official designation that would make it harder to raise barriers against cheap Chinese steel products.
"Say 'no' to MES for China," said a banner carried by steelworkers dressed in hardhats and fluorescent uniforms, referring to the market economy status long denied Beijing.
China joined the World Trade Organisation in 2001 as a developing country economy run largely by the state but was promised a review within 15 years to win a change in status to put it on a par with its major trading partners.
The US and Canada are determined to continue denying China the designation, but fears are that Europe may forge ahead in an effort to avoid angering Chinese authorities.
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Though declining for years, the European steel sector counts for 11 per cent of the world's total output and employs about one million people in some of Europe's most economically fragile regions.
"If surrendered, China MES could cost the EU millions of jobs and hundreds of billions of euros in lost growth," said a statement by AEGIS, a lobby grouping several industries that would be affected by the change in status.
The European Commission, which handles trade matters for the EU's 28 member states, has until the end of the year to make a decision.
At a news briefing, Commission spokesman Daniel Rosario insisted that the decision would be strictly based on technical grounds.
"We are not engaging in a broader philosophical discussion on whether China is a market economy or not," he said.
"This is a specific discussion in the very specific and strict framework of the anti-dumping legislation of the EU," he said.