How to prevent cracks in seamless black steel pipes
High-precision seamless black steel pipes generally improve the properties of the material by adding alloys to the metal. After cold drawing, the seamless black steel pipe needs to be subjected to stress relief annealing to eliminate the residual stress of the material, improve the material structure, and improve the material. Plasticity, thereby preventing the occurrence of fracture failure of seamless black steel pipes.

At present, the material of stainless steel seamless steel pipe in my country is ordinary 45# or 20# steel 27SiMn steel, which improves the metal strength through cold drawing deformation; however, it is at the expense of sacrificing the plasticity and toughness of the metal. High precision cold drawn seamless steel pipe is based on its high dimensional accuracy and high strength properties. It is necessary to ensure that the deformation amount is within a certain range in order to maximize the performance of the material and reduce the material. Negative impact.

The deformation of the seamless black steel pipe is too small to meet the requirements of surface finish and dimensional accuracy, and the strength index of the components cannot be achieved; A fibrous structure is formed, and the metal will have significant anisotropy. The axial direction of the cold-drawn seamless steel pipe is parallel to the elongation direction of the grain, and the strength increases; the radial direction of the cold-drawn seamless steel pipe is perpendicular to the elongation direction of the grain, and the strength decreases instead. The maximum stress of the hydraulic cylinder exists in the seamless steel pipe. The radial direction of the steel pipe, so the excessive deformation is not conducive to the performance of the cold drawn pipe.
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