ADI is a nodular graphite cast-iron (ductile cast iron) applied with austempering.  Cast iron is the low cost also flexible to design shape.  To austemper that cast iron to gain the same strength level as thermal refining steel.  Austempering is a treatment to immerse into mudium salt and cooling for a certain amount of time after heated.

Metallographic structure and treatment condition

before treatment

Before the treatment
Base: Perlite + ferrite

after treatment

After the treatment
Bainitic structure (x400)
High tensile strength and stretchiness
(the same level as SCM440 thermal refining steel)

Mechanical property comparison

Mechanical property comparison



Batch type ADI furnace
Batch type ADI furnace

The factroy is able to do

Tokai Factory
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

Contact Us

Nagato Heat Treatment (Thailand) Co., Ltd.
7 /379 Moo 6, Tambol Mabyangporn, Amphur Pluakdaeng, Rayong, Thailand
Tel. +66-(0)38-027-473  Fax. +66-(0)38-027-475