Spiral steel pipe spiral seam high frequency welded pipe --- Everbright Chengye pipeline equipment manufacturing exclusively for --- Our company specializes in the production of thermal expansion of steel pipe, spiral steel pipe, high frequency welded pipe, the annual distribution of Baotou Steel, Tianjin Steel and other steel mills after wall seamless steel pipe, I plant sided submerged arc welding process in North China's premier, 35 technicians, thermal expansion pipe equipment unit is a German import unit error is small, accurate scale. The public are welcome to visit and negotiate.