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Why Is Cold Cracking Steel Cracking During Quenching And Tempering?
- Apr 20, 2018 -

The surface unsmoothness and even cracking of cold drawn steel after stamping are analyzed. The result is that, because of the difficult operation of equipment, material and technology, the hardness of the surface is hard to be hardened after cold drawing and no annealing treatment. The elongation of steel is more than the toughness of cold drawn steel at high stamping strength. Therefore, in the process of quenching and tempering, it is easy to cause cracking.

Usually, there are many problems when the segregation of components, the existence of gas and inclusions, and forging temperature and forging ratio are mishandled. Because of the strip segregation of the raw material of the cold drawn steel, the segregation of components is retained after hot pressure processing, and the segregation can be seen from the annealed structure after quenching. And it is because of segregation that the cold drawing steel is heated to the solid phase line in the oxidizing atmosphere, and it is easy to produce precipitates or impurities, which is the main reason for the defects.

It has been shown that the cold drawing steel is caused by the forging process and the heat treatment process. After quenching, the mixed structure and the complex stress distribution will be obtained, which will cause the cracking. For cracking workpieces, it is better to use controlled gas multipurpose furnace for austempering and high temperature tempering, so that the effect will be more stable.