Mastering materials to go further

THERMILYON Group specializes in heat treatment and vacuum coatings for mechanical engineering.

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Improve the mechanical performance of your parts

A true pioneer in contract heat treatment for the subcontracting industries, the THERMILYON group has been capitalizing on technical innovation and service provision in heat treatment and vacuum deposition since 1960.

With a network of 9 sites in France and abroad, the THERMILYON Group favors close relationships with its partners and active listening to understand their needs and challenges.

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Solutions tailored to your needs

To ensure that our advice is always well-informed and objective, the THERMILYON Group offers a wide range of solutions to provide treatment adapted to the environment and constraints of the room.

Heat treatment
Heat treatment
parts partially coated with platin vacuum coating
Vacuum deposition
Vacuum deposition
1960

Year the THERMI-LYON Group was founded

5000

More than 5,000 customers in France and abroad

32

Millions of euros in sales

20

Millions of euros in human and technological investment over the past 4 years

165

employees

100

100% of our sites are certified

expertise in every market

To meet the expectations and requirements of certain markets, our sites are specialized and organized by market sector.

Our partners

fim logo
logo uimm auvergne rhone alpes
logo of A3TS, the association for heat treatment and surface treatment
logo cluster aeronautique auvergne rhone alpes
logo cluster aeronautique aerospace valley
woman looking through a microscope
loading a nitrex nitriding furnace at Thermi-Picardie

    Our locations near you

    Trempelec
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    Thermi-Loire
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    Thermi-Garonne
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    Thermi Bugey
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    Infra-Therm
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    Thermi-Picardie
    Thermi-Metalurgica
    Thermi-Lyon
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    Thermi-Platin
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    Our certifications

    ISO 13485

    ISO 13485 establishes the criteria for the quality management system of an organization providing medical devices and related services in compliance with customer requirements and applicable regulations.

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    ISO EN 9100

    EN 9100 certification guarantees the quality management system requirements of the ISO 9001 series, and specifies additional definitions and notes for the aerospace and defense industry.

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    IATF 16949
    logo IATF 16949 certification dedicated to the automotive industry

    The IATF 16949 standard, dedicated to the automotive sector, establishes criteria for quality management processes, encouraging continuous improvement, defect prevention and the reduction of non-conformities and scrap within the automotive supply chain.

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    NADCAP Heat Treating

    NADCAP is an accreditation program for aerospace and defense subcontractors, designed to ensure the quality and reliability of products and services. This accreditation focuses on the special processes employed in the manufacture, testing and maintenance of components and systems used in these industries. Within the THERMILYON Group, NADCAP applies only to the special heat treatment process.

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    ISO 9001

    The ISO 9001 standard, widely recognized throughout the world, helps organizations improve their performance by meeting quality management system requirements and demonstrating a commitment to customer satisfaction.

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    See all our certifications
    Customer testimonials

    Cédric Lancieux

    Technical Director, Euroteknika 

    "We needed to call on a company skilled in vacuum coating to ensure lasting quality for our products. It was thequality aspect that drew me back to them. We make products that stay in patients' mouths; quality is paramount in our business, and it's an aspect that Thermi-Platin more than lived up to. What Euroteknika needs is to differentiate itself in the market, and the coating produced by Thermi-Platin is a differentiator. Today, they are even proactive and solution-oriented. They come to us with real answers."

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    Portrait of Cédric Lancieux, Euroteknika employee

    Claude Madelmont

    Borg Warner Supplier Selection Manager

    "We specialize in what's known as the powertrain; that's everything to do with the engine and transmission. These parts have electromagnetic and wear-resistance characteristics. This is a very important point. The THERMILYON Group specializes in controlled atmosphere nitrocarburizing. This involves heat-treating the part to make it harder and more resistant to wear. This is a state-of-the-art treatment. Trempelec processes 15,000 to 25,000 partsat a time".

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    Portrait of Claude Madelmont, Borgwarner collaborator

    Damien Pignol

    Methods and Supply Chain Engineer at Lisi Aerospace Additive Manufacturing

    "When it comes to research and development aimed at creating new treatments to meet emerging challenges, Thermi-Garonne clearly stands out for its receptiveness and ability to propose innovative solutions, setting itself apart from the competition.
    Thermi-Garonne's uniqueness lies in its 100% management of LISI Aerospace Additive Manufacturing parts."
    As for the service offered by Thermi-Garonne, Damien Pignol expresses great satisfaction, ranking them among the top three suppliers for the company.

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    Jérôme Lefebvre

    Purchasing manager at ERMO-tech

    "We specialize in the cosmetics, pharmaceuticals, medical and fine wall sectors, as well as in high-precision, high-speed closures. Thermi-Platin treats certain parts of our molds to extend their service life. All contact, friction and sliding between parts need to be hardened with DLC, a surface coating. Today, we have an average lead time of 3 days with Thermi-Platin. Thermi-Platin has been able to offer relevant products and prove its responsiveness to the needs of the ERMO group. They also provide us with a partner and technical support in our search for solutions.

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      Increase the performance of your parts

      The THERMILYON Group is your partner for improving your mechanical parts. Our teams will help you choose the treatment best suited to your needs.

      Contact us

      Our latest news

      Find out all the latest news about the THERMILYON Group as well as heat treatment and vacuum deposition.

      parts treated by gas nitriding
      All about gas nitriding
      Gas nitriding is a nitrogen-based heat treatment process. The technique was developed at the beginning of the last century in the armaments industry, and is now used in a wide range of industrial sectors. Because of its very low processing temperature and the many properties it confers on [...]
      June 4, 2024
      All about gas nitriding
      induction-annealed parts
      What is induction annealing?
      Annealing is one of the best-known heat treatments for metals. Induction, on the other hand, is a heating method based on the diffusion of an electromagnetic current transmitted by an inductor to the surface of parts. The combination of these two technologies is ideal for applying a localized annealing treatment to metal parts.
      June 4, 2024
      What is induction annealing?
      surgical utensils and tools on a gray background
      When should biocompatible coatings be used?
      A biocompatible coating must integrate perfectly with the natural organism in which it is found, without degrading or impacting it in any way. The biocompatibility of materials is thus essential in the medical and food industries, where treated products inevitably come into contact with the human body. A number of tests can be carried out to [...]
      June 4, 2024
      When should biocompatible coatings be used?
      What are the alternatives to hard chrome?
      Hard chromium has long been used in industry and offers numerous advantages. Versatile, it guarantees high resistance to wear and corrosion, as well as excellent friction properties. On the other hand, while its manufacture seems to be very economical, it does require certain environmental precautions. Finished products are not [...]
      June 4, 2024
      What are the alternatives to hard chrome?
      Discover the benefits of vacuum deposition for the medical sector
      Vacuum deposition technology affects various metal properties. First and foremost, it makes treated parts more resistant to wear and guarantees improved mechanical performance. It also produces elements with a natural appearance, a real asset for dental implants, for example. It also [...]
      June 4, 2024
      Discover the benefits of vacuum deposition for the medical sector
      Damien Pignol from LISI Aerospace for Thermi-Lyon. Case study.
      Collaboration between LISI Aerospace Additive Manufacturing and Thermi-Garonne Why use Thermi-Garonne? The treatment of metal parts In the manufacturing sector, heat treatments are essential for the production of parts, generating exacting requirements throughout the entire manufacturing process. This is of paramount importance, particularly in the [...]
      May 29, 2024
      Damien Pignol from LISI Aerospace for Thermi-Lyon. Case study.