Pa Seputembala 17, 2021, Dipatimenti Yamalonda ku US idapereka chilengezo chonena kuti kuwunikanso komaliza kwachisanu kotsutsana ndi kutaya zinyalala za mapaipi olumikizidwa ndi chitsulo cha carbon (CarbonSteelButt-WeldPipeFittings) omwe atumizidwa kuchokera ku China, Taiwan, Brazil, Japan ndi Thailand kudzamalizidwa. Ngati mlanduwu wathetsedwa, ntchito zotsutsana ndi kutaya zinyalala pankhaniyi zidzapangitsa kuti zinthu zomwe zikukhudzidwa ndi mlanduwu zitayidwe ku China pamlingo wotaya zinyalala wa 182.90% kapena kuchitika kwa milandu, kuchuluka kwa kutaya zinyalala kwa zinthu zomwe zikukhudzidwa ndi mlanduwu ku China kudzapitirira kapena kuchitika, ndipo kutaya zinyalala kwa zinthu zomwe zikukhudzidwa ndi mlanduwu kudzapitirira kapena kuchitika pamlingo wotaya zinyalala wa 87.30% ndi 52.25%. Kutaya zinyalala kwa zinthu zomwe zikukhudzidwa ndi mlanduwu kudapitilira kapena kuchitika pamlingo wotaya zinyalala wa 65.81%, ndipo kuchuluka kwa kutaya zinyalala kwa zinthu zomwe zikukhudzidwa ku Thailand kudapitirira kapena kuchitika pamlingo wotaya zinyalala wa 52.60%. Ndi 7307.93.30.

Pa Disembala 12, 1986, United States idakhazikitsa mwalamulo ntchito zoletsa kutaya zinyalala pa mapaipi olumikizidwa ndi chitsulo cha carbon omwe amachokera ku Brazil ndi Taiwan, China. Pa February 10, 1987, United States idakhazikitsa mwalamulo ntchito zoletsa kutaya zinyalala pa mapaipi olumikizidwa ndi chitsulo cha carbon omwe amachokera ku Japan. Pa Julayi 6, 1992, United States idakhazikitsa mwalamulo ntchito zoletsa kutaya zinyalala pa mapaipi olumikizidwa ndi chitsulo cha carbon omwe amayambira ku China ndi Thailand. Kuyambira pamenepo, US yachita ndemanga 4 za kulowa kwa dzuwa, pa Januware 6, 2000, Novembala 21, 2005, Epulo 15, 2011, ndi Ogasiti 23, 2011. Chitsimikizo ndi chilengezocho zidapangidwa nthawi 4. Pa Julayi 1, 2021, Dipatimenti Yamalonda ya US idapereka kafukufuku wokhudza kuwunikanso kwachisanu koletsa kutaya zinyalala pa mapaipi olumikizidwa ndi chitsulo cha carbon omwe amachokera ku China, Taiwan, Brazil, Japan ndi Thailand.