Marvel at the awe-inspiring moment when a blade is quenched, as revealed by our underwater camera. Quenching is an essential process for improving the blade's rigidity, hardness, endurance and resistance to abrasion. Once the blade reaches a temperature of 750-800 degrees centigrade, it's plunged into water to cool.
Copyright © 2020 CGTN. Beijing ICP prepared NO.16065310-3