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
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Circuit Cooling Spray:
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Locking Pliers With Epoxy Coating for Welding
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ZVS Driver
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Meanwell RSP-1000-48 Power Supply
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Litz Wire for Custom Induction Coils
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Graphite Crucible
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Temperature Meter 2000F(1300C)
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Power Meter 100V 50A
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Cast Iron Mini Skillet
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Aerosol Fire Extinguisher
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Black Gloves
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Bullet Connectors
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Cherry Red Case Hardening Compound
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