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Hot forged technology of big bolt and nut

Hot forged technology of bolts and hex nuts

During hot upsetting, the billet is heated to the temperature above the metal recrystallization point by induction heating or in the forging furnace or oven.

This extreme high temperature is necessary to avoid strain hardening of metals during deformation. Because the metal is in a plastic state, it can be made into quite complex shapes. Metals retain ductility and toughness.

The average forging temperature required for hot heading of different metals is:

• Steel up to 1150 ° C

• Aluminum alloy 360 to 520 ° C

• Copper alloy 700 to 800 ° C


In order to forge some metals, such as superalloy steel, a hot heading called isothermal forging is used.

Here, the die is heated to a temperature close to the billet to avoid surface cooling of the part during forging. Forging is sometimes carried out in a controlled atmosphere to minimize the formation of oxide scale.

Generally speaking, complex parts are manufactured by hot upsetting, because it allows the material to deform in its plastic state, and the metal is easier to process.

Factors to consider hot upsetting include:

• Production of complex parts

• Medium and low precision dimensions

• Low stress or low work hardening

• Uniform grain structure

• Increased ductility

Our factory produce hex bolts long sizes and big sizes with hot forged technology.

Post time: Nov-24-2022

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