Domestic straight steel pipe manufacturers usually improve their performance by adding alloys to the materials. After cold pulling, stress and annealing must be performed to eliminate the residual stress of the material to prevent the broken seam steel pipes from being broken. Cold -pull deformation to increase the strength of the metal, but this is at the expense of the shape and toughness of the metal.
Cold -pull straight steel pipes are based on the market. They have high -size accuracy and high -intensity performance. It must ensure that the deformation must be within a certain range in order to maximize the performance of the material and reduce the adverse effect on materials. Putting parallel with the stretching direction of grains, the strength of the cold pulled straight steel pipe is perpendicular to the stretching direction of the grain, but the strength decreases, and the maximum stress of the hydraulic cylinder exists in the radial of the straight seam steel pipe. Therefore, the deformation is too large. , It is impossible to give full play to the performance of cold pull tubes.
If the straight seam steel pipe is too large, the plasticity and toughness of the straight seam steel pipe manufacturers will be greatly reduced. The grains are pulled too long without forming a fiber structure, and metal has obvious orientation opposite sex. If the deformation is small, it can neither meet the flatness and size requirements of the parts, nor can it meet the strength requirements of the component.
