The high precision cold drawn seamless steel pipe in foreign countries generally improves the material performance by adding alloy in the metal. After cold drawing, the seamless steel pipe needs stress relief annealing to eliminate the residual stress of the material, improve the structure of the material and improve the plasticity of the material, so as to prevent the fracture and failure of the seamless steel pipe.
At present, the material of cold drawn seamless steel tubes in China is ordinary 45 × or 20 × 27SiMn Steel, which improves the metal strength through cold drawing deformation, but it is at the expense of metal plasticity and toughness. High precision cold drawn seamless steel tube is based on the market because of its high dimensional accuracy and high strength performance. It must ensure the deformation within a certain range to maximize the performance of materials and reduce the adverse impact on materials.