Thaum lub Cuaj Hlis 17, 2021, Lub Tsev Haujlwm Saib Xyuas Kev Lag Luam hauv Tebchaws Meskas tau tshaj tawm tias qhov kev tshuaj xyuas zaum kawg thib tsib ntawm cov yeeb nkab carbon steel butt-welded (CarbonSteelButt-WeldPipeFittings) uas tau xa tuaj ntawm Tuam Tshoj, Taiwan, Brazil, Nyiv Pooj thiab Thaib teb yuav raug ua tiav. Yog tias qhov kev ua txhaum cai raug tshem tawm Cov se tiv thaiv kev pov tseg hauv rooj plaub no yuav ua rau muaj kev pov tseg ntawm cov khoom lag luam koom nrog hauv rooj plaub hauv Suav teb ntawm tus nqi pov tseg ntawm 182.90% lossis qhov tshwm sim ntawm cov rooj plaub, tus nqi pov tseg ntawm cov khoom lag luam koom nrog hauv rooj plaub hauv Suav teb yuav txuas ntxiv lossis tshwm sim, thiab kev pov tseg ntawm cov khoom lag luam koom nrog hauv rooj plaub yuav txuas ntxiv lossis tshwm sim ntawm tus nqi pov tseg ntawm 87.30% thiab 52.25%. Kev pov tseg ntawm cov khoom lag luam koom nrog hauv rooj plaub txuas ntxiv lossis tshwm sim ntawm tus nqi pov tseg ntawm 65.81%, thiab tus nqi pov tseg ntawm cov khoom lag luam koom nrog hauv Thaib teb txuas ntxiv lossis tshwm sim ntawm tus nqi pov tseg ntawm 52.60%. Nws yog 7307.93.30.

Thaum Lub Kaum Ob Hlis 12, 1986, Tebchaws Meskas tau tsim cov se tiv thaiv kev pov tseg rau cov yeeb nkab carbon steel uas tau txuas los ntawm Brazil thiab Taiwan, Suav teb. Thaum Lub Ob Hlis 10, 1987, Tebchaws Meskas tau tsim cov se tiv thaiv kev pov tseg tag nrho rau cov yeeb nkab carbon steel uas tau txuas los ntawm Nyiv Pooj. Thaum Lub Xya Hli 6, 1992, Tebchaws Meskas tau tsim cov se tiv thaiv kev pov tseg tag nrho rau cov yeeb nkab carbon steel uas tau txuas los ntawm Suav teb thiab Thaib teb. Txij thaum ntawd los, Tebchaws Meskas tau ua 4 qhov kev tshuaj xyuas hnub poob, thaum Lub Ib Hlis 6, 2000, Kaum Ib Hlis 21, 2005, Plaub Hlis 15, 2011, thiab Yim Hli 23, 2011. Kev lees paub thiab kev tshaj tawm tau ua 4 zaug. Lub sijhawm. Thaum Lub Xya Hli 1, 2021, Lub Tsev Haujlwm Saib Xyuas Kev Lag Luam Tebchaws Meskas tau tshaj tawm kev tshawb nrhiav txog qhov kev tshuaj xyuas hnub poob thib tsib ntawm cov yeeb nkab carbon steel uas tau xa los ntawm Tuam Tshoj, Taiwan, Brazil, Nyiv Pooj thiab Thaib teb.