HEAT TREATMENT: FOR KNIVES OR KNOCKOUT DRUMS

摘要

Civilization as we know it today would not have been made possible had man not learned how to utilize iron and steel to the high degree of which it is currently employed. Steel can be heat treated so that it is hard, springy, or relatively soft. In ancient time, when all combat was face to face, a warrior depended on the quality of his sword. He would neither want it to break nor bend in battle. As a result, the sword quality often resulted in a situation of life or death during combat.