Category: Toughness
7 thoughts on “Toughness”
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How to Heat Treat Nickel Knife Steels – 15N20, 8670, L6
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Knife Steel Metallurgist Juha Perttula
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Intro
Juha Perttula has a doctorate in metallurgy and he has published several studies in scientific journals on heat treating knife steels. So for this article I want to feature not just an individual study but a person’s work. His studies have focused on traditional bladesmithing, low alloy and carbon steels, and wootz Damascus. He also makes and sells knives which you can read about at his website, juhaperttula.com. Juha’s website also has links to the articles I will be discussing below, and I recommend you read them in addition to my commentary.
Z-Tuff and CD#1 – The Toughest Knife Steel?
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Vancron and the Problem with Nitrogen Knife Steels
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What is the Best Hardness for MagnaCut Knives?
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Chris Hancock, Chad Morris, Edward Voss, Liam Gogley, Erik Turner, Nathan Raptis, Nick Dunham, Joe Busic, Will Red Five Forge, Dmitry Kiyatkin, Edward Edmonds, Asinelli, Mattew Reagan, Nate, Dan Barrett, Malachi Chou-Green, Nats Spawnee, McKenzie Kelsay, Jantz Supply, Adam Webb, Brian Baley, Blade HQ, and Mark Demshock.
Knife Steels Rated by a Metallurgist – Toughness, Edge Retention, and Corrosion Resistance
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Bainite Heat Treatments of 52100, O1, and 1095 – How Much Toughness?
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YouTube Video
There is a video version of the following content:
How to Heat Treat 8670
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Podcasts
I appeared on two podcasts this past week, Knife Perspective and Mark of the Maker. Knife Perspective I had been on before so we mostly focused on MagnaCut and other topics. Mark of the Maker was a full interview asking about my background before discussing my book, website, and CPM MagnaCut. So listen to one or the other or both depending on what you’re in the mood for.
CPM MagnaCut – The Next Breakthrough in Knife Steel
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What Causes Razor Blades To Dull
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Just out of curiosity, did you ever test ztuff with a high temper. At one time I did some testing, and found it to be much tougher if tempered at around 1000 degrees. This was compared to tempering at 400 degrees!
I haven’t tested the high temper on Z-Tuff.
I think it would score quite a bit higher on you’re charts! Maybe in the future I could heat treat a few samples and send them to you. I’m interested personally!
Why is there a huge discrepancy with 14c28n toughness results. Older charts Say it’s a 3. I’ve abused my Kershaw blur since 2013 and never had issues. You have it at a 9 I think. Which is fantastic
Is DC53 tougher than 14c28N? Google ai says that it is. But it explains that DC53 is twice as tough as D2. Which D2 is not that tough. As far as I understand, 1.4116 is tougher, and I found a chart that says it’s rated as a 2.5 out of ten. When 14C28N is a 9 out of ten.
I have not tested DC53 but it would be unlikely to be tougher than 14C28N. I wouldn’t bother asking any AI these types of questions. My tests for A2 were around 15 ft-lbs. A2 has the same carbon but 3% lower chromium, which would likely give it an advantage in toughness over DC53.