Double submerged arc welded spiral steel pipe prices ---- Everbright Cheng industry Pipeline Equipment Manufacturing Co., Ltd. exclusively for --- my company specializes in producing thermal expansion pipe, spiral steel pipe, high frequency welded pipe, the annual distribution of Baotou Steel, Tianjin Steel and other steel mills the posterior wall of seamless steel tubes, 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.