Non-oxidation Quenching and Tempering (Thermal Refining)

Non-oxidation quenching and tempering process

Enabling thermal refining mainly for automotive and construction materials.

Non-oxidation quenching and tempering (thermal refining) is
performed mainly for bolts used in automotive and construction materials.

Thermal Refining of Steel Bolts

Thermal Refining of Steel Bolts

This process adjusts hardness and toughness for the purpose of improving mechanical properties.

Non-oxidation quenching and tempering, also known as thermal refining, is a thermal treatment that adjusts hardness and toughness while obtaining the specified strength by performing tempering at a relatively high temperature after quenching. Carburizing is a thermal treatment suitable for tapping screws and drill screws, whereas tempering is mainly for automotive and construction bolts.

  • ・ This processing is mainly suitable for automotive and construction bolts and parts.
  • ・ A prescribed strength, hardness, and toughness can be obtained.
  • ・ Highly controlled atmospheric gas prevents surface oxidation and significant decarburization.
Continuous gas quenching and tempering furnace capable of tempering high-strength bolts for automobiles

Our continuous furnace is capable of performing thermal refining of high-strength automotive bolts.

For a continuous gas quenching and tempering furnace for thermal refining, we use a product manufactured by Toyo-Ro Industries Co., Ltd.

Reliable delivery system

We ensure delivery dates by mutually complementing our three bases in the Kanto, Chubu, and Kansai regions.

We achieve high-quality thermal processing at any of our plants under the highest quality control system. Please feel free to contact us.

Kameoka Plant

Kyoto Plant

Shimizu Plant

Shimizu Plant

Sugito Plant

Sugito Plant

Toyota Motor Corporation, Nissan Motor Corporation, Honda Motor Co., Ltd., Mazda Corporation, and others

Contact the following for consultations and inquiries about non-oxidation quenching and tempering (thermal refining).

Responsible personnel:Nomura


Tanaka Nekko Co., Ltd.
Kameoka Plant
3-10-5 Oichotsuchida, Kameoka-shi, Kyoto 621-0011 Japan

Responsible personnel:Karata


Tanaka Nekko Co., Ltd.
Shimizu Plant
622-15 Shishihara, Shimizu-ku, Shizuoka-shi, Shizuoka 424-0301 Japan

Responsible personnel:Shigeki


Sugito Plant
193-9 Fukawa, Sugitomachi, Kitakatsushika-gun, Saitama 345-0012 Japan


Click here to download the metal thermal treatment and non-oxidation quenching and tempering (thermal refining) brochure.