-28 * 2.5 - 3 - 4 - 5 seamless steel pipe 404 * 8 - 9 - 10 - 12 - 14 - 16 hot-rolled steel shelf - Our company specializing in the production of thermal expansion of steel pipe, spiral steel, high-frequency welded pipe, the annual distribution of the posterior wall of Baotou Steel, Tianjin Steel and other steel seamless steel pipe, I plant sided submerged arc welding process is second to none in North China, 35 technicians, thermal expansion pipe equipment unit is a unit imported from Germany , the error is small, precise scale. Welcome to come to visit and negotiate.