How to Prevent Seamless Steel Tube from Fracturing

Domestic high-precision seamless steel pipe is generally by increasing the alloy in the metal approach to improve the performance of materials, seamless steel pipe in the cold drawing, the need for stress-relief annealing, the elimination of residual stress, improve the material organization, Plasticity, so as to achieve the purpose of preventing the occurrence of fracture failure of seamless steel pipe.
At present, China's stainless steel seamless steel pipe are made of ordinary 45 # or 20 # steel 27SiMn steel, by cold drawing deformation of the metal strength; however, it is at the expense of metal plasticity, toughness at the expense. High precision cold drawn seamless steel pipe is based on its high dimensional accuracy and high strength properties based on the market, it must ensure that the deformation in a certain range, in order to maximize the performance of the material, reducing the material Negative Effects.
Seamless steel pipe deformation is too small to meet the requirements of surface finish and dimensional accuracy, can not reach the strength index of components; deformation is too large, seamless steel pipe plasticity, toughness reduced too much, and the grain was pulled too thin , The formation of fibrous tissue, the metal will have obvious anisotropy. Cold drawn seamless steel tube axial, parallel to the grain elongation direction, strength increased; cold drawn seamless steel tube radial, perpendicular to the grain elongation direction, but decreased strength, while the hydraulic cylinder maximum stress Is present in the radial direction of the seamless steel pipe, so the deformation is too large to fully play the performance of cold drawn tube disadvantage.

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