Heat treatment of 15CrMo alloy steel pipe

Chemical heat treatment is to infiltrate atoms of one or more chemical elements into the surface of the workpiece, thus changing the chemical composition, microstructure and properties of the surface of 15CrMo alloy tube. After quenching and tempering at low temperature, the surface of 15CrMo alloy tube has higher hardness, wear resistance and contact fatigue strength, while the center has higher strength and toughness. The main technical parameters of chemical heat treatment 15CrMo alloy pipe are the depth of hardened layer and surface hardness. The depth of hardened layer should still be detected by Vickers hardness tester. Measure the distance from the surface of 15CrMo alloy pipe to the point where the hardness drops to 50HRC. This is the effective hardening depth. The surface hardness test of 15CrMo alloy pipe is similar to that of surface quenching heat-treated 20Cr precision steel pipe, which can be tested by Vickers hardness tester, surface Rockwell hardness tester or Rockwell hardness tester, but the nitriding thickness is relatively thin, generally less than 0.7mm, so Rockwell hardness tester can no longer be used, and microhardness tester can be used.