FACTBOX - Sino-U.S. trade disputes pile up

By Lucy Hornby

BEIJING (Reuters) - Trade rows between the United States and China will be a key issue on the agenda when U.S. President Barack Obama holds talks with Chinese leaders in Shanghai and Beijing this week.

Here are some of the disputes dogging China-U.S. trade:

STEEL PIPES

The U.S. Commerce Department this month slapped preliminary anti-dumping duties ranging up to 99 percent on $2.63 billion in Chinese-made oil well pipe in the biggest U.S. trade action against China. The Chinese Ministry of Commerce denounced the move as protectionist and launched its own investigation into imports of U.S.-made automobiles.

China has also filed a World Trade Organisation challenge to U.S. anti-dumping duties on certain types of steel pipes, pneumatic off-road tyres and woven sacks. China is increasingly turning to the WTO to keep markets open to its products.

COPPER PIPES LOOM

Last week, the U.S. International Trade Commission voted to back a Commerce Department probe into whether China and Mexico have been selling seamless refined copper pipe and tube in the United States at unfairly low prices.