Common Defects and Preventive Measures of 30CrMo Steel

1. Cracks appear on the surface of 30CrMo steel after carburizing
Reason:
a.The concentration of surface penetration layer for 30CrMo steel is too high.
b.30CrMo steel has poor concentration gradient of infiltrated layer.
c.The cooling rate of 30CrMo steel is not appropriate.
d.30CrMo steel itself has serious dendrite segregation.

Prevention method:
a.Strictly control the heating temperature and speed of 30CrMo steel, and try
to heat evenly.
b. Strictly control the carburizing process of 30CrMo steel.
c. Select the appropriate cooling rate.
d. Check whether there is segregation in the composition of 30CrMo steel.

2. Deformation of 30CrMo steel after quenching
Reason:
a.30CrMo steel is quenched in the wrong way.
b.The quenching cooling rate of 30CrMo steel is too large.
c.The temperature of quenching heating for 30CrMo steel is too high.

Prevention method:
a. Formulate the correct quenching method.
b. Select the appropriate quenching medium and quench in strict accordance
with the operating specifications.
c. Control the quenching heating temperature.