Marquench treatment is generally cooled down in salt (e.g. NaNO2: KNO3=1: 1 melting point: 140°) after glowing. (it’s not that long in cooling compared to austempering.) For this treatment, hardening with less temperature irregularities on both the surface and inside is possible and this has the effect of inhibiting deformations.

Stability of thermal strain

Both the surface and inside are cooled down right up to Ms point and given a martensitic transformation gradually, then the thermal strain will be stabilized.



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
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