Chemical heat treatment of structural pipe

　　Chemical heat treatment is to make the surface of structural steel pipe infiltrate the atoms of one or several chemical elements, so as to change the chemical composition, structure and performance of structural steel pipe surface. After quenching and low temperature tempering, the surface of structural steel pipe has high hardness, wear resistance and contact fatigue strength, while the core of structural steel pipe has high strength and toughness

　　The main technical parameters of chemical heat treatment of  High Quality Carbon Structural Steel Pipe of Steel Tube are the depth of hardening layer and surface hardness. The depth of the hardened layer should be measured by Vickers hardness tester. Detect the distance from the surface of structural steel pipe to the point where the hardness drops to 50 HRC.

　　The surface hardness test of effective hardening depth chemical heat treatment structural steel pipe is similar to that of surface quenching heat treatment structural steel pipe, which can be tested by Vickers hardness tester, surface Rockwell hardness tester or Rockwell hardness tester, but the thickness of nitriding thickness is relatively thin, generally no more than 0.7mm, so Rockwell hardness tester can no longer be used, and micro hardness tester can be selected Hardness tester.