Straight seam steel pipe is a steel pipe whose weld seam is parallel to the longitudinal direction of the steel pipe. It is generally divided into metric electric welded steel pipe, electric welded thin-walled pipe, transformer refrigeration pipe, etc. The production process of straight seam steel pipe is simple, high production efficiency, low cost, and rapid development. The strength of spiral welded pipes is generally higher than that of straight seam welded pipes. A narrower blank can be used to produce welded pipes with larger pipe diameters, and a billet with the same width can also be used to produce welded pipes with different pipe diameters. But compared with the straight seam pipe of the same length, the weld length is increased by 30-100%, and the production speed is lower. Can straight seam steel pipes be connected with certain materials? Is there a way to prevent the fracture of the straight seam steel pipe? Let me introduce to you.
Although straight seam steel pipe is a versatile steel, it does not mean that it can be put together with most materials. Below we take carbon steel and straight seam steel pipes as examples for a brief description:
If it is put together with carbon steel products (such as carbon steel pipes), some chemical reactions will occur, because carbon steel pipes are different from stainless steel pipes. If they are put together, the straight seam steel pipes will rust. If they are in contact with each other, there will be potential differences, and electrochemical corrosion will occur, especially in the case of moisture or standing water. Electrochemical corrosion mainly causes the oxidation reaction of steel. In order to avoid this reaction, do not put the steel in the together.
Methods to avoid fracture of straight seam steel pipe:
Manufacturers of
longitudinally welded pipes usually change their properties by adding alloys to the material. After cold drawing, stress annealing is required to reduce the residual stress of the material, thereby preventing the fracture of longitudinally welded pipes. At present, longitudinally welded pipe manufacturers adopt cold drawing deformation To increase the strength of the metal, but this is at the expense of the shape and toughness of the metal. Cold drawn longitudinal welded pipes are based on the market and have high dimensional accuracy and strength. It is necessary to ensure that the deformation is within the range and reduce the adverse impact on the material.
If the deformation of the longitudinally welded pipe is small, it cannot meet the flatness and dimensional accuracy requirements of the parts, nor can it meet the strength requirements of the parts. If the deformation is too large, the plasticity and toughness of the longitudinally welded pipe manufacturer will be greatly reduced, and the grains will be too long. The fiber structure cannot be formed. The metal has obvious anisotropy. The axial direction of the cold drawn longitudinally welded pipe is parallel to the direction of grain elongation. The strength of the cold drawn longitudinally welded pipe is perpendicular to the direction of grain elongation, but the strength is reduced. The stress of the hydraulic cylinder exists in the radial direction of the longitudinally welded pipe, so the deformation is too large, and the performance of the cold drawn pipe cannot be fully utilized.
The above has introduced the relevant content of the method to avoid the fracture of the straight seam steel pipe. I hope the above content can help you.
Tips: ERW welded pipe is formed by rolling strip and welding the seam, with tighter dimensional tolerances and less weight. The weld seam is heat treated after welding that no untempered martensite remains, and the weld flash can be removed from both inner and outer surfaces.
