The mechanical property of steel depends on the amount of carbon content. Carbonization is a heat treatment method to penetrate and diffuse carbon on the material surface by heating the low carbonization material in a gas. (it’s literally ‘carbonization’.)
Then, apply hardening after carbonization to harden the surface and the central part will become extremely tough. This is applied for a lot of parts like gears and shafts that are required to have strength and abrasion resistance.

Metallographic structure and treatment condition

Ferrite + perlite before treatment

Martensite high hardness, wear resistance after treatment

Generally, carbonization treatment is done at high temperature at approximately 930°. For that reason, deformation caused by hardening can be big. Carbonitriding can make the carbonization treatment possible at the low temperature of about 800° by mixing a little amount of nitrogen gas in the carbonization gas and penetrating and diffusing the carbon and nitrogen on the surface of the material. In addition to that, it is also applicable for those lower consistency steels with less amount of alloy content by using the nitrogen effect on the surface.

Metallographic structure and treatment condition

Ferrite + perlite before treatment

Martensite high hardness, wear resistance after treatment

Equipment

Batch type gas carbonization furnace

Pit type carburizing furnace

The factroy is able to do

Kaita Factory 9-9 Tsukimi-machi, Kaita-cho, Aki-gun, Hiroshima-ken, 736-0034, Japan Tel. +81-(0)82-822-2957 Fax. +81-(0)82-822-7294	Shiwa Factory 190-1 Aza Fukasako, Kanmuri, Shiwa-cho, Higashi-Hiroshima-shi, 739-0265, Japan Tel. +81-(0)82-420-5511 Fax. +81-(0)82-420-5615
Tokai Factory 138 Kasuga, Takaoka-Shinmachi, Toyota-shi, Aichi-ken, 473-0921, Japan Tel. +81-(0)565-52-3631 Fax. +81-(0)565-53-4611	Kariya Factory 46-1 Shimonagare, Ichiriyama-cho, Kariya-shi, Aichi-ken, 448-0002, Japan Tel. +81-(0)566-35-0361 Fax. +81-(0)566-35-0362
Hofu Factory 26-1 Shintukiji-cho, Hofu-shi, Yamaguchi-ken, 747-0824, Japan Tel. +81-(0)835-25-3737 Fax. +81-(0)835-25-8626