Holding time of aluminum alloy aging furnace

Holding time of aluminum alloy aging furnace

The choice of holding time should be determined according to the wall thickness of the aluminum profile and the tightness of the filling. Generally, when the wall thickness is less than 1.2 mm, take the lower limit holding time, and when the wall thickness is above 5.0 mm, take the upper limit holding time. In the middle of the wall thickness, choose the appropriate time for the upper and lower holding time. If the furnace load is small and the material is sparse, the lower limit of the holding time can be selected; if the furnace load is large and the placement is dense, the upper limit of holding time should be selected.

The service life of carburizing furnace pot

Because the outside of the aluminum coil nitrogen protection annealing furnace is close to the electric heating element, the temperature is higher, the carburizing furnace can reach 950 to 1,000 degrees, and the furnace pot has good oxidation resistance; the inside of the furnace pot is in a carburizing atmosphere, which requires carburizing The carbon furnace needs to have good carburization resistance. At the same time, due to the large load of the carburizing furnace, the carburizing furnace is also required to have higher high temperature strength.

　　 Sometimes ring-shaped cracks are generated below the mouth of the carburizing furnace, which is related to the structure of the carburizing furnace and the complex stress conditions in this area. It can be seen from the structure that the zone where the ring crack occurs is the transition zone between the high temperature zone in the carburizing furnace tank and the low temperature zone at the upper tank mouth. Therefore, under the action of different temperatures in the upper and lower parts, the Thermal response. Greater force. In addition, this area is just at the bottom of the sealing ring at the mouth of the furnace and the tank wall.

Comparing the service life of the carburizing furnace pot, Cr18Ni25Si2. Cr25Ni20 steel has the highest service life of the carburizing furnace pot, which is more than 3 times that of the Cr18Mn12Si2N steel pot.

　　The connected part is at the part where the cross-section changes. Due to the superposition of thermal stress and load stress, and the bottom of the seal ring is the support point of the entire carburizing furnace, the stress is greatest at this point during operation. Furthermore, this place is the hot spot of the casting, and there is more possibility of casting defects, so a ring-shaped crack perpendicular to the stress appears.

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