The daily use of seamless steel pipe plant is due to many post-processing procedures. Anyway, there will be such a situation. The specific heat of the return process will be heated to 750 degrees, the heat will be for some time, slowly cooling to 500 degrees, and finally cooling is called ball annealing in the air. The purpose is to reduce the hardness of steel and improve cutting performance, mainly for high carbon steel. The main purpose is to refine and normalize the structure of seamless steel pipe, improve the performance of steel, close to the equilibrium state of the structure.


The steel is heated to a temperature above the critical point (840-860 C for 45 steel and 760-780 C for carbon tool steel) for a certain period of time, and then cooled in water (oil) at an appropriate speed to obtain a martensite or bainite heat treatment process called quenching.


The unstable tempered components of kg/m_can not be determined. Therefore, the tensile properties of tempered components above 400 C (tempered workpieces at 300) are also determined by the Japanese Industrial Standard (JIS). In other words, the tensile test of reversed mass parts (+400 C quenching and tempering).  In industry, it is only to inquire about the anti-rotational bending fatigue and wear resistance of tempered components. Induction hardening and surface hardening are suitable for this case. Partial tensile stress does not use low temperature tempering. However, in low carbon steel, quenching and self-tempering M (as high as Ms point) can occur, and users are in quenching state. The requirement of all measures taken for steel and material extraction has been fulfilled because the specific measures have updated the requirements of several quenching devices, and there is no sense of seamless steel pipe as a whole.