How Can Steel Be Used to Cut Steel?: Metallurgy Minute 001

If they’re made of the same material, why can steel drill bits be used to put holes in a steel sheet? 
The chemistry of the steel alloy, heat treatment, and the quenching process come together to make steel tooling hard and strong enough to cut other steels. In this Metallurgy Minute, Paulo metallurgist Ryan Van Dyke explains how it works.