The mold steel contains more alloying elements, and when the element with a higher vapor pressure is heated in a vacuum, it easily undergoes a steaming phenomenon. Therefore, it is necessary to appropriately control the degree of vacuum during quenching and heating to prevent the volatilization of the alloy elements. Especially with high Cr steel grades.
In order to reduce the thermal effect and tissue stress caused by heating the mold steel or parts due to temperature difference between inside and outside, complex or large-section mold parts must be preheated many times, and the heating rate can not be too fast, which is the key to reduce or prevent deformation. one.
Larger sections of gas quenched steel mold parts should be handled in a high pressure gas quench furnace. If the air-cooling speed is not enough for oil quenching, air-cooled oil quenching must be used to prevent white bright layered structures on the surface of the workpiece after oil quenching.
The vacuum quenching heating temperature may be substantially the same as or slightly lower than the salt bath heating and air heating temperatures. However, it should be noted that when the temperature is raised, the temperature of the workpiece is much faster than the temperature of the furnace. Therefore, the temperature is equal to the temperature of the furnace.
Whether the charge is reasonable or not depends on the quality of heat treatment. Considering that vacuum heating is based on radiation, mold parts should be placed properly in the furnace. Small parts need to be separated by metal mesh to make heating and cooling uniform.
Contact: Mr. Chen 18988586811
Service Hotline
Address: Road 105, Xiongchang Industrial Zone, Sanxiang Town, Zhongshan City, Guangdong Province
In order to reduce the thermal effect and tissue stress caused by heating the mold steel or parts due to temperature difference between inside and outside, complex or large-section mold parts must be preheated many times, and the heating rate can not be too fast, which is the key to reduce or prevent deformation. one.
Larger sections of gas quenched steel mold parts should be handled in a high pressure gas quench furnace. If the air-cooling speed is not enough for oil quenching, air-cooled oil quenching must be used to prevent white bright layered structures on the surface of the workpiece after oil quenching.
The vacuum quenching heating temperature may be substantially the same as or slightly lower than the salt bath heating and air heating temperatures. However, it should be noted that when the temperature is raised, the temperature of the workpiece is much faster than the temperature of the furnace. Therefore, the temperature is equal to the temperature of the furnace.
Whether the charge is reasonable or not depends on the quality of heat treatment. Considering that vacuum heating is based on radiation, mold parts should be placed properly in the furnace. Small parts need to be separated by metal mesh to make heating and cooling uniform.
Contact: Mr. Chen 18988586811
Service Hotline
Address: Road 105, Xiongchang Industrial Zone, Sanxiang Town, Zhongshan City, Guangdong Province
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