Tianjin boyutong international trade co., ltd is a trade company. it is one of the subsidiary companies of tianjin boai enterprise . tianjin boai enterprise manufactures and supplies welded steel pipes, hot galvanized pipes, helically welded pipes. its products are widely used in fluid transmission (water, crude oil, natural gas, coal gas, air, and vapor for heating), fire fighting, and frame structure and hall structure. these products are manufactured in conformity with standards of astm a53, bs 1387, din 10219, api 5l, api 5ct etc.. it is a large-scale company specialized in the production of longitudinal seam pipe (od: 42mm~~244.5mm, wt: 3 mm~~14 mm)(od:1.665 inch ~~ 9.625 inch, wt: 0.118 inch~~ 0.551 inch) and sub-merged arc pipe (od: 219 mm ~~ 2020 mm, wt: 8 mm ~~ 20 mm) (od:8.625 inch ~~ 79.528 inch , wt: 0.314 inch ~~ 0.787 inch).galvanized pipe (od:48mm~~219mm, wt: 3 mm ~~ 14 mm)(od:1.890 inch ~~8.625 inch, wt: 0.118 inch ~~ 0.551 inch)