Yanshan Hengnuo Steel Tube Co. Ltd. ( www.hbhngg1.com ) production : spiral steel pipe ( spiral seam welded pipe, spiral welded pipe factory, large diameter spiral pipe, spiral steel pipe, spiral pipe, composite anticorrosive spiral pipe, straight seam pipe ( ) of ERW steel pipe factory, straight seam steel pipe manufacturers, large diameter longitudinal welded pipe, ERW pipe, thick wall thickness longitudinal parenchyma steel pipe ), thermal expansion tubes ( seamless hot-expanding steel pipe, straight seam welded pipe thermal expansion ), large diameter thick wall tube ( single pipe joints, double pipe joints, longitudinal welded steel pipe, galvanized pipe ) ( cold galvanized pipe, galvanized pipe, threading pipe ), plastic pipe, pressure pipe, anti-corrosion, insulation steel pipe, flange, elbow, bend, three, the first pipe size, according to the requirements of customers design and manufacture various special-shaped steel tube size.