A U.S. trade panel approved steep import duties on Chinese-made steel gratings, despite a protest from Beijing earlier this month.

The decision is a victory for AMICO, the largest U.S. steel grating producer, and Fisher & Ludlow, a Nucor Nucor Corp company.

The U.S. International Trade Commission voted 6-0 that U.S. manufacturers had been injured by unfairly priced and subsidized imports from China.

The ruling allows the Commerce Department to impose final anti-dumping duties announced ranging from 136.76 percent to 145.18 percent and a final countervailing duty of 62.46 percent on the Chinese product.

After those levels were announced earlier this month, China's Ministry of Commerce issued a statement complaining that "the United States wrong finding and calculations hurt China's interests, which is unacceptable to both the Chinese government and industry."

The case is one of several that have strained trade ties between the two countries in recent years.

Steel gratings are used in industrial floors, docks, rampings, drainage covers, staircases and other applications. (Reuters)