Simply put, heat treatment is the process of adding heat then cooling down to change the metallographic structure of a metal thus creating hardness, toughness and fatigue strength in the product, that’s right, a swordsmith ‘hardens’ a sword, that’s heat treatment.

Where forging/casting and machining are about the shape and dimensional changes of a product, the feature of heat treatment is to make quality changes.

Our role at NAGATO is to give each part and product ‘added value’ and ‘characteristics through the appropriate heat treatment method based on our customers’ requests and improve its value.
On top of that, all processes can be provided and suggested at NAGATO from the heat treatment all the way to machining work, so this is why we are called ‘A department store for heat treatment’.