Ka la 17 Loetse 2021, Lefapha la Khoebo la U.S. le ile la fana ka tsebiso e bolelang hore tlhahlobo ea bohlano ea ho lahla liphaephe tsa carbon steel butt-welded pipe (CarbonSteelButt-WeldPipeFittings) tse tsoang China, Taiwan, Brazil, Japan le Thailand li tla phetheloa. .Haeba tlolo ea molao e hlakotsoe Mesebetsi e khahlanong le ho lahla nyeoeng ena e tla fella ka ho lahla lihlahisoa tse amehang nyeoeng ea Chaena ka tekanyo ea ho lahla ea 182.90% kapa ketsahalo ea linyeoe, tekanyo ea ho lahla ha lihlahisoa tse amehang nyeoeng. China e tla tsoela pele kapa e tla etsahala, 'me ho lahleloa ha lihlahisoa tse amehang nyeoeng ho tla tsoela pele kapa ho etsahala ka tekanyo ea ho lahla ea 87.30% le 52.25%.Ho lahleloa ha lihlahisoa tse amehang nyeoeng ho ile ha tsoela pele kapa ho etsahetse ka sekhahla sa 65.81%, mme sekhahla sa ho lahloa ha lihlahisoa tse amehang Thailand se ile sa tsoela pele kapa sa etsahala ka sekhahla sa 52.60%.Ke 7307.93.30.

Ka la 12 Tšitoe, 1986, United States e ile ea beha ka molao mesebetsi e thibelang ho lahla liphaephe tse entsoeng ka carbon steel butt-welded tse tsoang Brazil le Taiwan, Chaena.Ka la 10 Hlakola, 1987, United States e ile ea beha semolao mosebetsi o felletseng oa ho thibela ho lahla liphaephe tse tsoang Japane., Ka la 6 July, 1992, United States e ile ea laela ka molao mosebetsi o feletseng oa ho thibela ho lahloa ha lipeipi tse entsoeng ka carbon steel butt-welded tse qalileng Chaena le Thailand.Ho tloha ka nako eo, US e entse litlhahlobo tse 4 tsa ho likela ha letsatsi, ka la 6 Pherekhong 2000, la 21 Pulungoana 2005, la 15 Mmesa 2011 le la 23 Phato 2011. Tiisetso le tsebiso li entsoe ka makhetlo a 4.kotara.Ka la 1 Phupu 2021, Lefapha la Khoebo la United States le ile la etsa lipatlisiso mabapi le tlhahlobo ea bohlano e khahlanong le ho latsoa ha letsatsi le likela tsa lipeipi tsa carbon steel butt-welded tse tsoang Chaena, Taiwan, Brazil, Japan le Thailand.