Ku ya 17 Nzeri 2021, Minisiteri y'Ubucuruzi ya Amerika yasohoye itangazo rivuga ko isuzuma rya gatanu ryo kurwanya imyanda ku byuma bikoreshwa mu miyoboro ya karubone (CarbonSteelButt-WeldPipeFittings) byatumijwe mu Bushinwa, Tayiwani, Brezili, Ubuyapani na Tayilande rizarangira. Niba icyaha gihagaritswe, imisoro yo kurwanya imyanda muri uru rubanza izatuma ibicuruzwa biri mu rubanza bijugunywa mu Bushinwa ku kigero cya 182.90% cyangwa hakabaho imanza, igipimo cyo kujugunya imyanda ku bicuruzwa biri mu rubanza mu Bushinwa kizakomeza cyangwa kibaho, naho kujugunya imyanda ku bicuruzwa biri mu rubanza bizakomeza cyangwa bibaho ku kigero cya 87.30% na 52.25%. Kujugunya imyanda ku bicuruzwa biri mu rubanza byakomeje cyangwa byabayeho ku kigero cya 65.81%, naho kujugunya imyanda ku bicuruzwa biri mu Butayile byakomeje cyangwa byabayeho ku kigero cya 52.60%. Ni 7307.93.30.

Ku ya 12 Ukuboza 1986, Leta Zunze Ubumwe za Amerika zashyizeho ku mugaragaro imisoro yo kurwanya ijugunywa ry’amazi ku byuma bisukwa mu byuma bya karuboni bikomoka muri Brezili na Tayiwani, mu Bushinwa. Ku ya 10 Gashyantare 1987, Leta Zunze Ubumwe za Amerika zashyizeho ku mugaragaro imisoro yose yo kurwanya ijugunywa ry’amazi ku byuma bisukwa mu byuma bya karuboni bikomoka mu Buyapani. Ku ya 6 Nyakanga 1992, Leta Zunze Ubumwe za Amerika zashyizeho ku mugaragaro imisoro yose yo kurwanya ijugunywa ry’amazi ku byuma bisukwa mu byuma bya karuboni byatangiriye mu Bushinwa na Tayilande. Kuva icyo gihe, Amerika yakoze isuzuma inshuro 4 z’izuba rirenze, ku ya 6 Mutarama 2000, ku ya 21 Ugushyingo 2005, ku ya 15 Mata 2011, no ku ya 23 Kanama 2011. Ibyemeza n’itangazo byatanzwe inshuro 4. Ku ya 1 Nyakanga 2021, Minisiteri y’Ubucuruzi ya Amerika yasohoye iperereza ku isuzuma rya gatanu ryo kurwanya ijugunywa ry’amazi ku byuma bisukwa mu byuma bya karuboni biva mu Bushinwa, Tayiwani, Brezili, Ubuyapani na Tayilande.