Heat Treatments for CNC Machined Parts

Heat treatment

Heat treatment could help melt all types of metal and convert it into the required mechanical shape without losing bit metal. And It is also applicable to make the metal more robust and ductile. Besides this, heat treatment also provides a miracle advancement to the metal machinery parts according to your desires.

Heat treatment has different types: annealing, normalizing, tempering, Nitriding, cyaniding, hardening, and flame hardening. So, the production team or engineers need to do deep research and determine which heat treatment will meet your needs & requirements ideally.

What is heat treatment?

Heat treatment is the process of heating and cooling materials including metal or alloy to maximum temperatures to produce a required effect, such as hardening or softening. Additionally, if you want to change the metallurgical structure of the metal, you have to apply heat treatment to it. Unique & innovative heat treatments are performed on metal to recreate and restore the metals in different designs or their first form.

When are heat treatments applied?

heat treatment for metal

The heat treatment is applied to the metal during the manufacturing process of machined parts. At this time, it is also ascertained what metal properties have been changed according to your requirements & design. Because sometimes metals may even be treated multiple times to get perfect structure.

If you want to accomplish the machine part’s desired model, you have to heat metal or alloy at a specific level of temperature for a certain period. Because metal is very rigid and stiff terbium, it is not easy to mold it into any shape without the best heat treatments. Plus, the specific heated period is called ‘SOAK TIME.’ And this soak time performs significant actions to transform the metal structure. If you apply longer Soak-Time, then the metal structure will be completely different from less soak time.  

The manufacturing team must know what temperature is required to heat the metal and how much cooling is required to cool the metal or alloy. All this information is essential to attain desired results when heat treatments are applied.  

Common heat treatments for CNC materials

CNC machine is an innovative manufacturing process that employs different types of equipment to design & develop creative machinery parts by breaking down rigid materials such as metal, alloy, wood, and many others. And, to melt the metal’s biological and impulsive structure, a variety of heat treatments were invented & applied to get desired results. Heat treatments work in the right directions to make metals more functional, robust, and malleable at any time to update the design of parts.   


Normalizing heating involves heating the metal to a predetermined temperature for a predetermined period. In most cases, the temperature is elevated for about 10 to 20 minutes. After normalizing heat treatment, you will let the parts cool in a calm environment. Thermal and mechanical metals undergo normalizing heat treatments to change their microstructure. This process reduces metal rigidity as well.


Nitriding heat treatment is a process in which nitrogen initiates into the surface of steel or alloy to develop an indurate character. Nitriding heating is usually performed on steel, tool steel, carbon steel, aluminum, and titanium. Moreover, the central purpose of Nitriding is to harden the metals and improve durability.   


The cyaniding heating process is speedy and practical and applicable on carbon steel.

The primary motive of cyaniding is to raise the toughness, wear resistance, and fatigue resistance of steel tools & parts. The cyanide salts are oxidized during cyaniding, liberating atomic carbon and nitrogen, which infiltrate into the steel.



In the quenching process, heated metal is drenched in high temperature, then passed by the cooling process to strengthen the metal and acquire the required structure of the material. The most common methods to quench are use of polymers, freshwater and saltwater, and oil. Moreover, freshwater is the most effective way to satisfy the metal and maintain its metal’s hardness. The quenching process enhances the hardness of all metals including plastic, and iron. Therefore, quenching is also referred to as quench hardening or quench toughness.


Hardening is the process in which a variety of metals are heated to increase hardness. In addition, hardening heating is performed at a predetermined temperature for a set-out quantity of time after the hardening process; metal parts cool in the air.  

Precipitation hardening

Precipitation hardening is a heat treatment implemented to raise the robustness/toughness of materials, including magnesium, titanium, steel, aluminum, etc. The precipitation hardening is also known as age hardening and particle hardening.

The precipitation-hardening process involves heating the metal or alloy at a very high temperature, then cooling it. Now, again heat the parts at the medium level of temperature, and again cool it to get the required structure of the metal. Moreover, precipitation hardening not only raises the hardness of parts.

Annealing, Stress-relieving & Tempering

The annealing heat treatment procedure is performed on different metallic sheets like silver, brass, and steel. In this process, metals are heated at an evaluative temperature for a certain period or until they modify. After this process, parts or tools are cooled by using the appropriate level of air. Furthermore, the annealing heat methodology precludes the most complicated metal from cracking and breaking. This heating process reduces crispiness and enhances malleability.  

Stress-relieving is another heat treatment performed on a metal in which alloy or steel is heated at pre-decided temperature then cools in the air. Furthermore, the prime motive is to alleviate stresses of metal that have been engrossed from several processes, including creating, cutting, hot rolling, welding, Etc. An essential fact is that in this heating treatment, steel is heated under the evaluative temperature.

Tempering is a shallow temperature (under A1) heat treatment method used to achieve a specified hardness/toughness ratio following neutral hardening, double hardening, atmospheric carburizing, carbonitriding, or induction hardening. Tempering heat treatment is conducted to ameliorate the metal properties. This heating process involves several kinds of metals, including steel and cast iron, heated at very high temperatures to get desired models. After tempering heat treatment, let the steel parts cool in the air. The tempering heating treatment is best to decrease the hardness of metals or alloy and change the physical shape of steel.

Steel spring tempering, low-temperature tempering, and high-temperature tempering are the three types of tempering. Steel and excellent working tools are tempered at low temperatures. For high-speed steel and hot working tools, high tempering temperatures are used. Springs are tempered through spring tempering.

The importance of heat treatment for CNC Machined parts

The heat treatment is very important for CNC machined parts because this is the methodology that can transform the mechanical characteristics of machine parts. The heating process makes the elements more valuable by increasing working speed & performance. All machined parts created using steel, alloy, steel, aluminum, and brass can be heated before and after the CNC machining technique.  

In this modern age, different manufacturing companies produce very complex machined parts for other industries to increase their functional performance & revenue. Heat treatment is a beneficial process to get desirable mechanical structures of machined parts and increase the hardness, power, and physical shape of machined parts as you need.


Heat treatments play a crucial role in obtaining a desirable mechanical & physical model of machined parts. It helps to make the metal stronger and malleable. Additionally, It helps improve the fragility, magnetic characteristics, and electrical properties of the alloy. 

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