I Main: posterior wall alloy tube, high-pressure pipe, large diameter thick-walled seamless - 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 seamless steel pipe, I plant sided submerged arc welding process is second to none in the North China region, 35 technicians, thermal expansion pipe equipment unit is the unit imported from Germany, the error is small, precise scale. Welcome to come to visit and negotiate.