Thaum lub Cuaj Hlis 17, 2021, Lub Tsev Haujlwm Saib Xyuas Kev Lag Luam Tebchaws Meskas tau tshaj tawm tias qhov thib tsib kev tiv thaiv kev pov hwm zaum kawg ntawm cov pa roj carbon steel pob tw-welded yeeb nkab fittings (CarbonSteelButt-WeldPipeFittings) tuaj ntawm Tuam Tshoj, Taiwan, Brazil, Nyiv thiab Thaib teb yuav tiav. .Yog tias qhov kev ua txhaum cai raug tshem tawm Lub luag haujlwm tiv thaiv kev pov tseg hauv qhov no yuav ua rau cov khoom pov tseg ntawm cov khoom lag luam koom nrog hauv rooj plaub hauv Suav teb ntawm qhov chaw pov tseg ntawm 182.90% lossis qhov tshwm sim ntawm qhov tshwm sim, qhov pov tseg ntawm cov khoom lag luam koom nrog hauv rooj plaub. Tuam Tshoj yuav txuas ntxiv lossis tshwm sim, thiab cov khoom pov tseg ntawm cov khoom lag luam koom nrog hauv rooj plaub yuav txuas ntxiv lossis tshwm sim ntawm qhov chaw 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 qhov chaw pov tseg ntawm 65.81%, thiab cov khoom pov tseg ntawm cov khoom lag luam koom nrog hauv Thaib teb txuas ntxiv lossis tshwm sim ntawm kev pov tseg ntawm 52.60%.Nws yog 7307.93.30.

Thaum Lub Kaum Ob Hlis 12, 1986, Tebchaws Asmeskas tau tsim cov dej num tiv thaiv kev ua haujlwm ntawm carbon steel pob tw-welded yeeb nkab fittings los ntawm Brazil thiab Taiwan, Tuam Tshoj.Thaum Lub Ob Hlis 10, 1987, Tebchaws Asmeskas tau tsim ua tiav cov dej num tiv thaiv kev ua haujlwm ntawm cov pa roj carbon steel pob tw-welded yeeb nkab fittings los ntawm Nyiv., Thaum Lub Xya Hli 6, 1992, Tebchaws Asmeskas tau ua tiav cov dej num tiv thaiv kev ua haujlwm ntawm cov pa roj carbon steel pob tw-welded yeeb nkab fittings uas tau pib hauv Suav teb thiab Thaib teb.Txij thaum ntawd los, Tebchaws Asmeskas tau ua 4 lub hnub poob tshuaj xyuas, thaum Lub Ib Hlis 6, 2000, Kaum Ib Hlis 21, 2005, Lub Plaub Hlis 15, 2011, thiab Lub Yim Hli 23, 2011. Qhov kev lees paub thiab tshaj tawm tau ua 4 zaug.lub sij hawm.Thaum Lub Xya Hli 1, 2021, Tebchaws Asmeskas Lub Tsev Haujlwm Saib Xyuas Kev Lag Luam tau tshaj tawm kev tshawb fawb txog kev tshuaj xyuas thib tsib los tiv thaiv hnub poob ntawm cov pa roj carbon steel pob tw-welded yeeb nkab fittings tuaj ntawm Tuam Tshoj, Taiwan, Brazil, Nyiv thiab Thaib teb.