What are the benefits of quenching and tempering of seamless pipes?

CS seamless pipes are pipes with hollow sections and are used in large quantities as pipelines for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. The production of seamless pipe requires a cold drawing process. After cold drawing, the seamless pipe undergoes plastic deformation because of the distortion of the lattice constant and the crushing of the crystal. The performance parameters such as compressive strength are significantly improved while the plastic deformation is significantly reduced.

What is tempering treatment

Quenching and tempering is a double heat treatment of quenching and high temperature tempering. Quenching and tempering can adjust the performance and material of the seamless pipe to a great extent, and its strength, plasticity and toughness are good, and it has good comprehensive mechanical properties; when quenching and tempering, the quenched part of the seamless pipe is fine-tuned. Microstructure dominated by acicular quenched martensite. However, high temperature tempering refers to tempering between 500-650 ° C, and tempered sorbite is obtained after high temperature tempering. This is a mixture of ferrite and granular carbide.

The benefits of seamless pipe quenching and tempering

1) For high carbon steel and high alloy steel, quenching can increase its strength to improve drillability.
 
2) For low carbon steel, quenching can replace heat treatment, make preparations for induction quenching in advance, and can reduce the deformation of seamless pipes and reduce production costs.
 
3) For medium carbon steel, quenching can remove the cementite structure of the mesh structure, which is beneficial to spheroidizing annealing.
 
4) For large and medium-sized seamless pipes or steel castings with large cross-section changes, quenching can be used instead of heat treatment to reduce the tendency of deformation and cracking, or to prepare the mechanism in advance for heat treatment.
 
5) For the heat treatment reverse repair parts of seamless pipes, the over-temperature hazards can be removed according to quenching, so that it can be heat treated again.

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