National Standard 42crmo Steel Heat Treatment Notes - China

42crmo steel is an alloy structural steel, which is often used to manufacture mechanical parts that bear large loads, such as gears, shafts and high-strength structural parts.

when heat treating 42crmo steel, the following aspects need to be paid attention to: heating temperature: when quenching, it is usually heated to 850-900°c.

the specific temperature should be determined according to the specific composition of the material and the required performance.

local overheating and oxidation should be avoided during the heating process.

insulation time: after heating, a certain insulation time needs to be maintained to ensure uniform temperature.

the insulation time is related to the thickness and shape of the workpiece.

it is usually recommended to keep it warm for 1 hour for every 25mm thickness.

quenching medium: commonly used media for quenching are oil, water and polymer solution.

42crmo steel is suitable for oil quenching, but attention should be paid to oil temperature and quenching speed to prevent cracking and deformation.

inspection and testing: hardness test, metallographic analysis, etc.

should be carried out after heat treatment to ensure that the material properties meet the design requirements.

brittleness after quenching: 42crmo steel may become brittle after quenching, so tempering is an essential step.

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