On September 17, 2021, the U.S. Department of Commerce issued an announcement stating that the fifth anti-dumping final review of carbon steel butt-welded pipe fittings (CarbonSteelButt-WeldPipeFittings) imported from China, Taiwan, Brazil, Japan and Thailand will be finalized. If the crime is cancelled The anti-dumping duties in this case will result in dumping of the products involved in the case in China at a dumping rate of 182.90% or the occurrence of cases, the dumping rate of the products involved in the case in China will continue or occur, and the dumping of the products involved in the case will continue or occur at a dumping rate of 87.30% and 52.25%. The dumping of the products involved in the case continued or occurred at a dumping rate of 65.81%, and the dumping rate of the products involved in Thailand continued or occurred at a dumping rate of 52.60%. It is 7307.93.30.

On December 12, 1986, the United States formally imposed anti-dumping duties on carbon steel butt-welded pipe fittings originating in Brazil and Taiwan, China. On February 10, 1987, the United States formally imposed a complete anti-dumping duty on carbon steel butt-welded pipe fittings originating in Japan. , On July 6, 1992, the United States formally imposed a complete anti-dumping duty on carbon steel butt-welded pipe fittings that started in China and Thailand. Since then, the U.S. has conducted 4 sunset reviews, on January 6, 2000, November 21, 2005, April 15, 2011, and August 23, 2011. The confirmation and announcement were made 4 times. the term. On July 1, 2021, the US Department of Commerce issued an investigation into the fifth anti-dumping sunset review of carbon steel butt-welded pipe fittings imported from China, Taiwan, Brazil, Japan and Thailand.