Coatings and Markers for

Heat treatments

Heat treatments are thermal processes applied to materials such as metals and alloys to modify their physical and mechanical properties. Heat treatments of metals are performed by controlling temperatures, heating, and cooling times to achieve certain desired characteristics in the material. The goal of heat treatments of materials is to optimize the mechanical, thermal, or magnetic properties of metals to meet specific design and use needs. The applications of metal heat treatments are suitable for various tools, for example, they are used in the manufacturing industry, especially in the production of mechanical components, hardware, tools, and other metal products.

Heat treatments suitable for the use of ATP coatings

ATP offers cost-effective, water-based masking/stop-off coatings designed for a wide range of heat treatment procedures, including cementation, gas carburizing, gas nitriding, carbo-nitriding and annealing.

  1. Annealing: Annealing is a heat treatment of metals that involves heating the material to high temperatures followed by controlled cooling. The main objective is to reduce internal stresses, improve workability and obtain a finer crystalline structure in the material. Annealing is often used after plastic deformation or welding processes.
  2. Carburizing: Carburizing is a process in which carbon is superficially introduced into a low carbon material. The material is heated in a carbon-rich environment, allowing the carbon to diffuse into the surface. This process increases the hardness of the outside of the material, creating a hardened layer known as the “hardening layer”. It is often used to improve the wear resistance of components such as gears and shafts.
  3. Gas Carburizing: Gas carburizing is a form of carburizing in which carbon is introduced into the surface of a material through contact with a carbon-rich gas at elevated temperatures. This process is used to obtain a harder and more wear-resistant surface.
  4. Gas Nitriding: Gas nitriding is a heat treatment in which the material is exposed to nitrogen-rich gases at elevated temperatures. The nitrogen diffuses into the surface of the material, forming nitride and increasing the hardness and wear resistance of the treated part. This process is often used to improve the fatigue resistance of components subjected to cyclic loading.
  5. Carbo-nitriding: Carbo-nitriding is a combined process involving the introduction of carbon and nitrogen into the surface of a material. This can be achieved through specific heat treatments that incorporate both carburization and nitriding, providing a combination of hardness and wear resistance.

Each of these heat treatments is designed to obtain specific properties in metallic materials, adapting them to the specific needs of the applications in which they will be used.

Other types of heat treatments

In addition to the heat treatments of metals mentioned above, there are also other types. Below is a short list of the most common types of heat treatments:

  1. Tempering: The material is heated to a critical temperature and then rapidly cooled, thereby increasing the hardness and brittleness of the material.
  2. Tempering: After quenching, the material is heated to lower temperatures to reduce brittleness without completely losing the hardness achieved by quenching.
  3. Normalization: The material is heated to a temperature higher than the quenching temperature, followed by air cooling. This process reduces internal stresses and improves the toughness of the material.
  4. Softening: The material is heated to moderate temperatures to reduce its hardness and improve its workability.
  5. Stress normalization: This heat treatment aims to reduce internal stresses in a material without significantly changing its hardness.

What are heat treatments used for?

Heat treatment is a fundamental process aimed at shaping the physical and mechanical properties of materials, especially metals and alloys. Through careful control of temperatures, heating and cooling times, this procedure aims to achieve various objectives.

A first aspect is the increase in surface hardness, a result obtained through processes such as tempering. This practice is particularly beneficial in enhancing the wear and abrasion resistance of crucial elements such as gears, bearings, and tools. At the same time, we try to improve the toughness of the materials, especially through treatments such as normalization. The goal is to reduce the fragility of the material while preserving good resistance. This is particularly essential in application contexts where a combination of strength and ability to absorb impacts is required, for example in structural parts.

Heat treatment also offers the ability to control hardness and strength on different layers of the material. This versatility is invaluable for adapting the metal to specific design needs, guaranteeing a controlled range of properties. Furthermore, targeted heating and cooling affects the crystalline structure of materials, bringing significant changes to their thermal and mechanical properties. This allows for optimal performance based on application needs. The heat treatment of metals also plays a crucial role in managing residual stresses, common after mechanical manufacturing or welding processes. Specific treatments, such as stress normalization, help reduce these stresses, improving the dimensional stability of the material.

To promote the workability of materials, softening is a heat treatment of metals aimed at making them more flexible during plastic deformation processes such as rolling or drawing. Finally, it should be emphasized that in some situations, heat treatment can also affect the magnetic properties of ferromagnetic materials.

If you need metal surface coatings to create a barrier for areas of your materials that need to be protected during heat treatment, ATP is the solution! Contact us for more information about our products or to receive a quote, we are always available to recommend the most suitable product for your metal heat treatment.


Our mission is to protect, lubricate, and identify metals and other surfaces across various industrial sectors. We offer customized solutions to meet your specific needs. Discover the distinctive advantages of ATP.

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