Q Is for Quenching
Metalworking Glossary for the Letter Q
See the index to the Glossaries here:
https://www.gearheadsurplus.com/blog/2295-metalworking-glossary.html
- Quenching. The process of rapidly cooling hot metal by contact with a lower temperature material like liquid or gas to harden it or otherwise alter its properties. The process is always followed by tempering to increase the metal’s ductility.