Spiral steel pipe Specification 219 * 2020mm shelf ---- company specializing in the production of thermal expansion of steel pipe, spiral steel pipe, high-frequency welded pipe, annual distribution of Baotou Steel, Tianjin Steel and other steel mills in the posterior wall of seamless steel tubes, I plant a double-sided submerged arc The welding process is second to none in North China, the technical staff of 35 people, the thermal expansion pipe equipment unit is a German import unit, the product error is small, accurate scale. The public are welcome to visit and negotiate.