Large diameter thick wall pipe quotations --- Our company specializes in the production of thermal expansion of steel pipe, spiral steel pipe, high-frequency welded pipe, the annual distribution of the posterior wall of Baotou Steel, Tianjin Steel and other steel seamless steel pipe, factory-sided submerged arc welding process North China's premier technical staff of 35 people, thermal expansion pipe equipment unit is the unit imported from Germany, the error is small, precise scale. Welcome to come to visit and negotiate. Tel: 6083098