Although straight seam steel pipe is a kind of multi-purpose steel, it does not mean that it can be combined with most materials. Let us take carbon steel and straight seam steel pipe as examples for a brief explanation. Steel pipes) put together, some chemical reactions will occur, because carbon steel pipes and stainless steel pipes are different, put them together, the straight seam steel pipes will rust, if different steels are put together in contact, there will be a potential difference, and then Electrochemical corrosion occurs, especially in the presence of moisture or stagnant water, which mainly causes the oxidation reaction of the steel. To avoid this reaction, do not put the steel together.
In order to avoid the fracture of the longitudinally welded steel pipe, the manufacturer of the longitudinally welded pipe usually adds alloys to the material to change its properties. After cold drawing, stress annealing is required to reduce the residual stress of the material, thereby preventing the longitudinally welded pipe from breaking.
If the deformation of the longitudinally welded pipe is small, the flatness and dimensional accuracy requirements of the parts cannot be met, and the strength requirements of the parts cannot be met. 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 excessive. Long, unable to form a fiber structure, metal has obvious anisotropy, the axial direction of the cold drawn longitudinally welded pipe is parallel to the direction of grain elongation, while the strength of cold drawn longitudinally welded pipe is perpendicular to the direction of grain elongation, but the strength is reduced , And the stress of the hydraulic cylinder exists in the radial direction of the longitudinally welded pipe, so the deformation is too large to give full play to the performance of the cold drawn pipe.