This company specialized production is heavy-caliber, the thick wall expands the straight slit-tube hotly. The outer diameter for φ89mm-φ920mm, wall thickness is 4.0mm-30mm, the product carries out GB, ASTMA53, ASTM as well as GB/T9711.1, GB/T9711.2, GB/T13793 and so on domestic and foreign standards. Welcome you to come to visit, inspection, discussion cooperation!