Ways to avoid straight seam steel pipe fracture

Straight seam steel pipe is a kind of steel pipe 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, the production efficiency is high, the cost is low, and the development is rapid. The spiral steel pipe The strength is generally higher than that of straight seam welded pipes, and welded pipes with larger diameters can be produced with narrower tube blanks, while welded pipes with different diameters can be produced with tube blanks of the same width, but compared with straight seam pipes of the same length, the weld length Increased by 30% and 100% respectively, the production speed is low, so can the straight seam steel pipe be connected with some materials, the following editor will introduce some methods to avoid the straight seam steel pipe fracture.

Although straight seam steel pipe is a kind of multi-purpose steel, it does not mean that it can be put together with most materials. Below we take carbon steel and straight seam steel pipe as examples for a brief description. If it is combined with carbon steel products (such as carbon steel pipe) together, there will be some chemical reactions, because carbon steel pipe and stainless steel pipe are different, if you put them together, straight seam steel pipe will rust, if you put different steel together and contact each other, it will rust There is a potential difference, and then electrochemical corrosion occurs, especially in the case of humidity or water, electrochemical corrosion mainly causes the oxidation reaction of the steel, in order to avoid this reaction, do not put the steel together.

To avoid the fracture of straight seam steel pipes, domestic straight seam welded pipe manufacturers 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 straight seam welded pipes. At present Domestic manufacturers of longitudinally welded pipes increase the strength of metals through cold-drawn deformation, but this is at the expense of the shape and toughness of the metal. Cold-drawn longitudinally welded pipes are based on the market and have high dimensional accuracy and strength. It is necessary to ensure that the deformation is within Within the scope, reduce the adverse effect on the material.

If the deformation of the straight seam 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 straight seam welded pipe manufacturer will be greatly reduced. The fiber structure cannot be formed, and the metal has obvious anisotropy. The axial direction of the cold-drawn longitudinal welded pipe is parallel to the elongation direction of the grain, and the strength of the cold-drawn longitudinal welded pipe is perpendicular to the elongation direction of the grain, but the strength is reduced, while The stress of the hydraulic cylinder exists in the radial direction of the straight seam welded pipe, so the deformation is too large, and the performance of the cold drawn pipe cannot be fully utilized