Ngomhla we-17 kweyoMsintsi, ngo-2021, iSebe lezoRhwebo laseMelika likhuphe isibhengezo esithi uphononongo lokugqibela lwesihlanu lokulwa nokulahla inkunkuma lwezixhobo zokufaka iipayipi zekhabhoni ezidityaniswe neempundu zesinyithi (iCarbonSteelButt-WeldPipeFittings) ezingeniswe zivela eTshayina, eTaiwan, eBrazil, eJapan naseThailand luya kugqitywa. Ukuba ulwaphulo-mthetho luyarhoxiswa Imisebenzi yokulwa nokulahla inkunkuma kweli tyala iya kubangela ukulahla iimveliso ezibandakanyekayo kwityala eTshayina ngesantya sokulahla inkunkuma se-182.90% okanye ukubakho kwamatyala, izinga lokulahla inkunkuma yeemveliso ezibandakanyekayo kwityala eTshayina liya kuqhubeka okanye lenzeke, kwaye ukulahla iimveliso ezibandakanyekayo kwityala kuya kuqhubeka okanye kwenzeke ngesantya sokulahla inkunkuma se-87.30% kunye ne-52.25%. Ukulahla iimveliso ezibandakanyekayo kwityala kuqhubekile okanye kwenzeke ngesantya sokulahla inkunkuma se-65.81%, kwaye izinga lokulahla inkunkuma yeemveliso ezibandakanyekayo eThailand liqhubekile okanye lenzeke ngesantya sokulahla inkunkuma se-52.60%. Yi-7307.93.30.

Ngomhla we-12 kweyoMnga ngo-1986, i-United States yamisela ngokusesikweni irhafu yokulwa nokulahla inkunkuma kwizixhobo zombhobho ezidityaniswe nge-carbon steel ezisuka eBrazil naseTaiwan, eTshayina. Ngomhla we-10 kweyoMdumba ngo-1987, i-United States yamisela ngokusesikweni irhafu epheleleyo yokulwa nokulahla inkunkuma kwizixhobo zombhobho ezidityaniswe nge-carbon steel ezisuka eJapan. Ngomhla wesi-6 kweyoMnga ngo-1992, i-United States yamisela ngokusesikweni irhafu epheleleyo yokulwa nokulahla inkunkuma kwizixhobo zombhobho ezidityaniswe nge-carbon steel eziqale eTshayina naseThailand. Ukusukela ngoko, i-US yenze uphononongo olu-4 lokutshona kwelanga, ngoJanuwari 6, 2000, ngoNovemba 21, 2005, ngo-Epreli 15, 2011, nango-Agasti 23, 2011. Ukuqinisekiswa kunye nesibhengezo senziwe amaxesha ama-4. NgoJulayi 1, 2021, iSebe lezoRhwebo lase-US likhuphe uphando malunga nophononongo lwesihlanu lokulwa nokulahla inkunkuma kwizixhobo zombhobho ezidityaniswe nge-carbon steel ezithunyelwe zivela eTshayina, eTaiwan, eBrazil, eJapan naseThailand.