U.S. Department of Commerce Maintains Countervailing Duty Order on Magnesia Carbon Bricks from China

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On November 4, 2026, the U.S. Department of Commerce announced the final results of its expedited third sunset review. The focus was on certain magnesia carbon bricks imported from the People’s Republic of China. The Commerce Department determined that revoking the countervailing duty order on these bricks would likely cause the continuation or recurrence of subsidized exports.

The decision impacts several companies. RHI Refractories Liaoning Co., Ltd., and its related companies, were found to have a net countervailable subsidy rate of 3.00 percent. Liaoning Mayerton Refractories and its partner Dalian Mayerton Refractories Co. Ltd., collectively known as Mayerton, were found to have a much higher subsidy rate of 232.63 percent. All other companies have a rate of 3.00 percent.

The original countervailing duty order was published in September 2010. It was designed to protect U.S. industry from unfair trade practices. The current review began in July 2026. The Magnesia Carbon Bricks Fair Trade Committee showed interest in keeping these protections.

The Commerce Department did not receive a response from the Chinese government. The Commerce Department notified the U.S. International Trade Commission about the lack of response. Because of this, an expedited review took place.

The product affected is magnesia bricks from China. These bricks are important in many U.S. industries. They are used for their durability and resistance to heat and are favored in steel making.

All information on this decision is available publicly. The final results were published under Federal Register Volume 91. The decision is addressed under the act’s relevant sections, including sections 751(c) and 752(b).

Companies that are part of this process must return or destroy all proprietary information. This is in line with specific regulations.

This action preserves existing protections against unfair trade. It helps maintain a fair market for U.S. producers of magnesia carbon bricks.

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