High frequency the welding resistance welded steel pipe --- Everbright - Industry Pipeline Equipment Manufacturing Co., Ltd. exclusively for --- Our company specializes in the production of hot expansion pipe, spiral steel pipe, high-frequency welded pipe, the annual distribution of the posterior wall of the Baotou Steel, Tianjin Steel and other steel mills seamless steel pipe, I plant double 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.