Heat Treating Carbon Steel - Heat Treating101

G"day everyone,

In this video I will be attempting to do two things, make a spoo.. I mean knife, and attempt to explain the theory behind basic heat treatment of carbon steel. Heat treating is on the face a very straightforward subject (especially with carbon steel) but there is a lot more in the theory that is at least worth knowing.

In this first video of a three part series I will go over the basic theory behind the heat treating of plain carbon steel, which is the steel I heat treat the most often. I will go over the reasoning behind why I choose to either oil or watch quench my parts and the expected results that one would expect from doing so. I will also go over the expected results that one would expect from tempering the steel at various temperates - looking at the expected hardness and toughness.

And through all of that I will attempt to make a single bevel Japanese style chef knife, although the real focus of the video is the heat treating aspect. This is not a knife making channel and I doubt you will ever see me make a knife again.

I will be light on some of the details however, a lot of he heat treating characteristics of low carbon steel are glossed over, as well as describing pearlite (I tried to but I was not very good at visualizing and describing it when I tried to edit it in) and I skipped over the TTT diagram (the bane of my existence in my materials course). Don't worry, a lot of these details will be filled in in part 2, along with alloy steel. But at over 26 minutes, I think there is enough detail for basic home heat treatment.

I hope you enjoy the video.

#heattreatment

Timestamps
0:00 - Intro
1:10 - Carbon Steel
2:56 - Mild Steel, Work Hardening and Normalizing
7:57 - Knifeing
10:18 - Case Hardening and Annealing
16:41 - Water vs Oil Quenching
20:04 - Final Hardness and Tempering
20:28 - Knifinging