Technical differences between the hot galvanized and cold galvanized Rectangular Pipe Rectangular Pipe galvanized corrosion resistance is much higher than a cold galvanizing (also known as electro-galvanized). HDG will not rust in several years, cold galvanized rust in six months! Cold galvanizing process for protecting metal against corrosion, for use of the zinc coating of filler, in any use of a coating method which is applied to the surface to be protected, the filler is formed zinc coating after drying, the dried coating having a content of zinc (95%). Steel under cooling conditions on the surface of galvanized hot dip galvanized square tube supply, and hot dip galvanized steel pipe under the conditions of hot-dip galvanized surface, its adhesive is very strong, not easy to fall off, though galvanized pipe also appeared corrosion phenomenon, but in a very long period to meet the technical and sanitary requirements for square and rectangular galvanized pipe is a pipe called a square and rectangular tubing, which is the side looks such as steel. After treatment process is rolled strip made. The general is to strip after unpacking, smooth galvanized pipe, curl, tube welding to form, and then rolled into the square tube by tube and then cut into the required length. Typically 50 per pack. Also known as square and rectangular hollow steel cold-formed galvanized square tube material, referred to as square tubes and rectangular tubes, code-named F and J 1, galvanized square and rectangular tube wall thickness tolerances, when the wall thickness shall be not more than 10mm nominal wall thickness of more than plus or minus 10 percent, plus or minus 8% of the wall thickness is greater than when the wall thickness 10mm, except for the corners and the wall thickness of the weld area. 2, usually galvanized Rectangular Pipe length delivery to 4000mm-12000mm, to 6000mm and 12000mm majority. Rectangular Pipe allow the delivery of not less than 2000mm length short foot and non-product, can also be delivered in the form of a mouthpiece, but the demand side should be used in the removal of the mouthpiece. Short foot and non-weight product length does not exceed 5% of total deliveries, for theoretical weight greater than 20kg / m square and rectangular tube should not exceed 10% of total deliveries. 3, square and rectangular tube bending galvanized per meter shall not be greater than 2mm, the total curvature is not greater than 0.2% of the total length. Galvanized square tube models _ _ Tangshan Tianjin galvanized square tube galvanized steel square tube selected by thousands of Rong Rong Tianjin Steel Pipe Co. thousand. Thousands of Tianjin Steel Pipe Co., Rong (www.tjqrgg.com) strong, credible, in Tianjin steel industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the 1000-pipe and you hand in hand into the brilliant, for a better future!