The quality of the bolts of China Stud Supplier directly affects the quality of equipment installation. Some equipment has strict requirements on the accuracy of elevation and location, especially for linkage equipment with a high degree of automation. When deviations occur, they should be dealt with according to the actual conditions of the equipment and different treatment methods should be adopted.
      1. Insufficient surface hardness, soft spots, and insufficient tensile strength
      (1) For water-based quenching medium. The concentration of PAG quenching liquid can be reduced or the concentration of salt quenching liquid can be increased to speed up the cooling rate;
      (2) Reduce the temperature of the quenching medium;
      (3) Increase the circulation and stirring to increase the quenching intensity;
      (4) Increase the quenching temperature and extend the holding time. Make the organization fully austenitized;
      (5) Choose steel grades with higher carbon content or steel grades with better hardenability.
      If the surface is decarburized. It will also cause insufficient surface hardness. It can be verified by increasing the amount of surface grinding and comparing the hardness changes before and after. If the surface is decarburized, the carbon potential of the heating furnace needs to be increased.
      2. Large deformation, quenching cracking, etc.
      (1) For water-based quenching medium, the concentration of PAG quenching liquid can be increased or the concentration of salt quenching liquid can be reduced to reduce stress;
      (2) Increase the temperature of the quenching liquid;
      (3) Reduce the circulation volume and stirring intensity;
      (4) Reduce the quenching temperature or pre-cooling and quenching;
      (5) Choose steel with lower hardenability for Hexagon Socket Head Bolt.