Ngomhla we-17 kuSeptemba, 2021, iSebe lezoRhwebo lase-US likhuphe isibhengezo esichaza ukuba uphononongo lokugqibela lokulwa nokulahlwa kwemibhobho ye-carbon steel butt-welded pipe fittings (CarbonSteelButt-WeldPipeFittings) esuka e-China, Taiwan, Brazil, Japan and Thailand iza kuqukunjelwa. .Ukuba ulwaphulo-mthetho lucinyiwe Imisebenzi echasene nokulahla kule meko iya kubangela ukulahlwa kweemveliso ezibandakanyekayo kwimeko yaseChina ngesantya sokulahla i-182.90% okanye ukwenzeka kwamatyala, izinga lokulahla imveliso echaphazelekayo kwimeko I-China iya kuqhubeka okanye yenzeke, kwaye ukulahlwa kweemveliso ezibandakanyekayo kwimeko kuya kuqhubeka okanye kwenzeke kwinqanaba lokulahla i-87.30% kunye ne-52.25%.Ukulahlwa kweemveliso ezibandakanyekayo kwimeko kwaqhubeka okanye kwenzeka ngesantya sokulahla i-65.81%, kwaye izinga lokulahlwa kweemveliso ezibandakanyekayo eThailand liqhubekile okanye lenzeka kwinqanaba lokulahla i-52.60%.Yi-7307.93.30.

Ngomhla we-12 kuDisemba, 1986, iUnited States yamisela ngokusesikweni imisebenzi echasene nokulahla kwikhabhoni yentsimbi enebutt-welded imibhobho yofakelo evela eBrazil naseTaiwan, eTshayina.Ngomhla we-10 kaFebruwari, 1987, iUnited States yamisela ngokusemthethweni umsebenzi ochasene nokulahlwa kwekhabhoni yentsimbi enebutt-welded umbhobho wemibhobho evela eJapan., NgoJulayi 6, 1992, iUnited States yamisela ngokusemthethweni uxanduva olupheleleyo lokuchasa ukulahlwa kwemibhobho edityaniswe ngentsimbi yentsimbi yekhabhoni eyaqala eTshayina naseThailand.Ukususela ngoko, i-US iqhube ukuhlaziywa kwe-4 kokushona kwelanga, ngoJanuwari 6, 2000, ngoNovemba 21, 2005, ngo-Aprili 15, 2011, kunye no-Agasti 23, 2011. Ukuqinisekiswa kunye nokubhengezwa kwenziwa ngamaxesha angama-4.igama elithile.Ngomhla woku-1 kuJulayi, ngo-2021, iSebe lezoRhwebo lase-US likhuphe uphando kuphononongo lwesihlanu lokulwa nokulahla ukutshona kwelanga kwizifakelo zemibhobho edityanisiweyo yentsimbi ye-carbon steel butt-welded evela e-China, e-Taiwan, e-Brazil, e-Japan nase-Thailand.