Hotbending elbow is an elbow made by heating a pipe and processing it with specialized equipment. It is then cut and heated to a critical temperature above the critical temperature. After holding it for a period of time, it is quickly placed in a quenching agent, causing its temperature to suddenly decrease. The elbow is made by cooling it at a rate that is suitable for cooling above the critical cooling rate

One of the processing methods: Quenching

Quenching is a heat treatment method that heats the elbow above the critical temperature, keeps it warm for a period of time, and then quickly puts it into a quenching agent to suddenly reduce its temperature. It is suitable to cool at a speed greater than the critical cooling rate, and obtain an unbalanced structure mainly composed of martensite.

. Quenching can increase the strength and hardness of steel, but it should reduce its plasticity. The commonly used quenching agents in quenching include water, oil, alkaline water, and salt solutions

Method 2: Normalization

Normalization is a heat treatment method that heats the hot pressed elbow above the critical temperature, transforms all the hot pressed elbows into uniform austenite, and then naturally cools them in air.

. Normalization can eliminate the mesh like carbides in eutectoid hot pressed elbows. For hypoeutectoid hot pressed elbows, normalization can refine the lattice and improve comprehensive mechanical properties. It is more economical to use normalization instead of quenching process for elbows with low requirements