China filed World Trade Organization complaints Friday to challenge U.S. tariffs on Chinese goods that Washington considers to be unfairly subsidized.

The dispute relates to 22 products including steel and solar cells, with an annual export value to the U.S. of $7.3 billion.

China accuses the U.S. of using anti-dumping measures to shield American companies from competition.

The appeal process begins with China requesting consultations with the U.S. to try to find a settlement. But, it may later move to arbitration if the two sides cannot agree. The WTO could then order the U.S. to scrap measures found to violate free-trade deals or to even pay compensation to Beijing.