Induction Heating Part 6: Cryogenic Case Hardening

Induction Heating Part 6: Cryogenic Case Hardening

In this video I show you how to cryogenically case harden your low carbon steel parts. What you end up with is a material that has a ductile inner core with a hard outer shell. Parts that require impact resistance as well as abrasion resistance are great candidates for case hardening.

Gears, Firing pins, Engine Camshafts, Lock Shackles, Security Fasteners, and Self Drilling Screws are all commonly case
hardened. The method of case hardening used in the video is also known as carburizing with a cryogenic treatment. Liquid nitrogen is usually used but I used a isopropyl alcohol dry ice bath. Liquid nitrogen would provide even more benefits by converting even more retained austenite to martensite. Also, if you don’t mind the darkness of the part after the hardening process, it’s best not to polish it for even more rust protection.

This process should mainly be used with low carbon and mild steels.

Links to Equipment Used in the Video:

Hardness Testing Files

https://amzn.to/1LZu6eM

Circuit Cooling Spray:

https://amzn.to/20E1vTK

Locking Pliers With Epoxy Coating for Welding

https://amzn.to/1WJa6ji

ZVS Driver

https://amzn.to/1NqHSaw

Meanwell RSP-1000-48 Power Supply

https://amzn.to/1NqHOYz

Litz Wire for Custom Induction Coils

https://amzn.to/1kIG6IA

Graphite Crucible

https://amzn.to/1Mdj34M

Temperature Meter 2000F(1300C)

https://amzn.to/1NqHV6j

Power Meter 100V 50A

https://amzn.to/1XnFMNv

Cast Iron Mini Skillet

https://amzn.to/1MfaT5y

Aerosol Fire Extinguisher

https://amzn.to/1NwFLlx

Black Gloves

https://amzn.to/1kIxf9G

Bullet Connectors

https://amzn.to/1MfaYX7

Cherry Red Case Hardening Compound

https://www.midwayusa.com/product/119479/cherry-red-surface-hardening-compound-1-lb

See my instructables account for step by step guides to some of my projects: https://www.instructables.com/member/Proto+G/

Please support my channel to help me make more videos: https://patreon.com/ProtoG

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