The heat treatment and recrystallization annealing of T22 steel pipe are the key. The austenitization must be made at a sufficiently high temperature. At the same time, T22 steel pipe needs to be cooled to about 740℃ with furnace cooling, and then T22 steel pipe is tempered at 720℃. The holding time is more than 1 h, and the temperature should be lower than 700℃.
The production practice shows that the T22 steel pipe can obtain good mechanical properties and metallographic structure by adopting this heat treatment process, and can also control the surface oxidation of the T22 steel pipe.
Due to the strict requirement of temperature control during the heat treatment of the T22 steel pipe, the qualified rate of heat treatment of the T22 steel pipe will be greatly increased by means of centralized heat treatment and special personnel management, operation and debugging.
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