Sealed Quench Furnace (SQF) – Case hardening and carburizing, carbonitriding, normalizing, annealing, ferritic nitrocarburizing, annealing and stress relieving.

https://www.youtube.com/watch?edufilter=NULL&feature=youtu.be&v=8hZcA1thyW8

https://www.youtube.com/watch?v=Q9e21lNPpWE&feature=youtu.be

https://www.youtube.com/watch?edufilter=NULL&feature=youtu.be&v=lJpkL6h8pCI

https://www.youtube.com/watch?edufilter=NULL&feature=youtu.be&v=5vaH5gCNge0

Images of SQF Furnace by Therelek