Material is QT450

Conditioning treatment

The aim of quenching tempering treatment is to optimize the crystal, remove the widmanstatten mechanism forge the ground stress.

Regulations on processing technology

In order to avoid the surface air oxidation during high temperature quenching, the iron box sealing quenching are used.

In order to avoid carburization of the surface layer of the casting, the wood carbon sealing property shall be added to the casting during loading.

Operation process:

Check if everything is OK.

Set the instrument cluster to the desired temperature.

Put the quenched tempered casting parts into the solution box, the height width ratio must be less than the shell, cover with wood carbon dry impetuous wood slag, then cover with the sealing property of the rear cover plate.

Turn on the switch power supply send it to the heat treatment equipment.

The air hole of the EPC casting closes the furnace mouth, closes raises the temperature to the required temperature, insulates the required time under the temperature control.

Turn off the power supply to terminate the heat insulation refrigeration of the casting according to the processing technology.

Sample measure the strength, send it to the process flow after meeting the standard.

If the strength of the casting is qualified after tempering, it is allowed to carry out tempering again, but more than three times.

common problem:

Often check the temperature, the instrument panel is all normal.

During the whole process of heat insulation heat preservation of casting parts, the furnace mouth shall be opened the power supply shall be closed due to human factors, the furnace mouth shall be closed tightly.

Immediately remove replace the recording paper of the instrument panel, the records of the processing process curve are inconsistent disordered.

Records are required for each heat.