Why Do Forging Flanges Need Heat Treatment?

If you want to know why do forging flanges need heat treatment, you must first get an understanding of the meaning behind forgings.

Forging is the use of a hand hammer, pressure equipment, or forging hammer on the mold on the heating of the metal blank force so that metal materials under the condition of non-separation plastic deformation obtain performance, size, and properties meet the requirements of parts.

Need of heat treatment for the forged flange

The main purpose is to refine the coarse grains, eliminate the residual stress and work hardening, reduce the hardness, improve the cutting performance, prevent the white spots while forging, and make sure about the required machinery and metal structure.

Why Do Forging Flanges Need Heat Treatment

Now, below are details about the heat treatment:

Normalizing


If you want to forge flange connections, heat treatment is the first step. Heat the forgings above the transformation temperature, form a single austenite structure, after a period of uniform temperature stability, after a blast furnace air cooling, the main purpose is to refine the grain.

If you normalize the temperature range that is usually between 760֯C and 950֯C, depending on the phase transition point of different component content.

Tempering


The first step for forging flange fittings heat treatment is tempering. The main purpose is to expand hydrogen. It can also stabilize the microstructure after phase transformation, eliminate the transformation stress and reduce the hardness. Forgings can be easily processed without deformation.

There are three kinds of tempering temperature, low-temperature tempering, medium tempering, or high tempering. Among them, the tempering temperature at high temperatures is 500-600. The tempering temperature at medium is 350-490, and the tempering temperature at low temperature is 150-250.

The cooling rate after tempering should be slow enough to prevent whitening due to the excessive transient stress during cooling and minimize the residual stress in forgings.

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