Hikari Corporation

From this time, we will introduce the types of heat treatment.

The first is the introduction of "quenching".

 

Quenching is a heat treatment in which steel is heated above 723°C and then cooled rapidly.

Use water or oil for sudden cooling.

Here's what the graph look like.

This makes the steel very hard.

At the same time, it becomes fragile, so it becomes hard and easy to break steel.