On July 5, 2013, the US International Trade Commission issued a notice initiating a full sunset review of the anti-dumping measures on light-walled rectangular pipe and tube originating in China, South Korea, Mexico, and Turkey, and a full sunset review of the countervailing measures on light-walled rectangular pipe and tube originating in China, to determine whether revocation of the anti-dumping and countervailing measures would be likely to lead to continuation or recurrence of material injury to the domestic industry within a reasonably foreseeable time.

　　On July 18, 2007, the US Department of Commerce initiated countervailing and anti-dumping investigations into light-walled rectangular pipe and tube originating in China, and simultaneously initiated anti-dumping investigations into light-walled rectangular pipe and tube originating in South Korea and Mexico. The HS codes of the products involved were 73066150.00 and 73066170.60. In June 2008, the US Department of Commerce made its final determination, ruling that the dumping margins for the Chinese companies involved ranged from 249.12% to 264.64%, and the subsidy rates ranged from 2.17% to 200.58%.