Views:3 Author:Site Editor Publish Time: 2019-04-19 Origin:Site
1.Pseudo-inferior rectangular tubes are prone to folding. Folding is a variety of fold lines formed on the surface of a rectangular tube that tends to extend throughout the longitudinal direction of the product. The reason for the folding is that the inferior manufacturer pursues high efficiency,the amount of pressing is too large,and the ear is generated, and the next rolling causes folding, and the folded product is cracked after being bent, and the strength of the steel is greatly reduced.We are rectangle stee pipe wholesale,you can know it.
2,the surface of the fake and inferior rectangular tube often has a pockmark phenomenon. The pockmark is a defect caused by the irregularity of the surface of the steel due to the serious wear of the groove. Due to the pursuit of profit by the manufacturers of counterfeit rectangular tubes, the most frequent rolling mill rolling is exceeded.
3,the surface of the pseudo-inferior rectangular tube is prone to scarring. There are two reasons for this: (1). The fake and inferior rectangular tube material is uneven and has many impurities. (2). Inferior manufacturers' guide equipment is simple, easy to stick steel, these impurities
4.The surface of the fake inferior material is prone to cracks because the billet is adobe and the adobe has many pores. During the cooling process, the adobe is subjected to thermal stress and cracks occur. After rolling, there is crack.
The management department of the Square Tube Association learned that the rectangular tube is a hollow long strip of steel, also known as a flat tube, a flat square tube or a square flat tube (as the name suggests). a large number of pipes used to transport fluids, such as oil,
Natural gas, water, gas, steam, etc., in addition, when the bending and torsional strength are the same, the weight is light, so it is also widely used in the manufacture of mechanical parts and engineering structures. Also used to produce a variety of conventional weapons, barrels, shells and so on.
The Information Department of the Square Tube Association was informed of the classification of rectangular tubes: steel pipes with seamless steel tubes and welded steel tubes (with seam tubes), hot-rolled seamless square tubes, cold drawn seamless square tubes, extruded seamless square tubes, and welded square tubes. The welded square tube is further divided into:
(a) According to the process points - arc welded square tube, electric resistance welded square tube (high frequency, low frequency), gas welded square tube, furnace welded square tube (b) according to the weld seam - straight seam welded square tube, spiral welded square tube.