Hot Forging Vs. Cold Forging Manufacturing Process

Hot Forging Vs. Cold Forging Manufacturing Process

When it comes to producing machine wear parts, one of the crucial things to consider is the techniques and processes used to attain the required quality. Different factories use various techniques, but hot forging and cold forging are amongst the most popular. That is because of the incredible strength that they add to the tools. In fact, they are techniques that most of the mulcher teeth producing factories including the Carbide Mulcher Teeth (CMT) are using. However, these two techniques are entirely different but delivers same results. But what are the main differences between the two? Well, we have broken down each of the techniques:

What is Hot Forging?

Hot forging is definitely one of the widely used techniques in the manufacturing machine wear parts. As the name suggests, hot forging is the use of heat to deform the work piece to attain the required features. The process requires the work piece of be heated until it softens to a point where it is almost melting. With that, you can turn to the shape or size that you want.

However, it is essential to note that various work pieces require varying temperatures while forging. For instance, if you are heat forging steel, then you will require different temperature compared to forging copper alloys. Here are some of the three standard temperatures in hot forging:

  • 360°C to 520°C for Al-Alloys
  • 700°C to 800°C for Cu-alloys
  • Up to 1150°C for steel

For the heat forging to work, then you must raise the temperature above the crystallization point of the work piece. At such high temperatures, the metal is in its molten form hence making it easy to deform to any shape and the size that you want. That is how tools are formed from the rudimentary pieces of metal. However, to get the best quality tools, then you need to consider other factors such as the issue oxidations. That is high end factories such as Carbide Mulcher Teeth (CMT) uses Isothermal form of hot forging. With this method, the operator is able to control the amount of oxygen during the forging process to reduce oxidation.

Advantages of Hot Forging

  • Increased wear part ductility
  • More flexible
  • Excellent surface quality
  • Cheap production cost


  • Less precision tolerance
  • Varying grain structures
  • The material could warp while cooling

Cold Forging

Unlike the hot forging, cold forging or cold heading works in low temperatures. As the name suggest, cold forging process is performed at room temperature. The process is quite simple since all that you need is to squeeze the work piece between two dies until it has assumed the required shape and size.

The process of cold forging is quite simple.  As mentioned, you only need room temperature to make wear parts using this technique. However, you cannot use the technique for all metals. The common metals are the carbon and standard alloy steels. During the cold forging process, the work piece is placed into the carbide die, and it is stuck multiple times rapidly until it assumes the shape. It is that simple.

Advantages of Cold Forging

There are many reasons why factories are opting for the cold forging in their wear parts production. One of the obvious benefits is the power consumption. Compared to hot forging, it consumes less power. Here are some of the main advantages of the cold forging:

  • Less energy consumption
  • Requires less or no finishing
  • Material saving
  • Excellent surface quality
  • Improved dimensional control
  • Easier to impart directional properties

Limitations of Cold Forging

  • Forms simple shapes only
  • Less ductility in wear parts
  • Residual stress could occur

Regardless of the few limitations, there are numerous benefits that you can enjoy from these two types of forging. What is essential to note is that the two forging processes produce the same results. However, you must observe the key factors such as the type of metal to deform to get it right.

At Carbide Mulcher Teeth (CMT), we produce our machine wear parts using the two forging techniques. That is the reason why the mulcher tools offer astounding quality and performance. In addition to producing, we also provide external processing services for hot forging and cold forging. Feel free to contact us any time or visit Carbide Mulcher Teeth (CMT) factory.