Mysterious hardening of carbon steel

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Paskanakki-Jack

Joined
Nov 2, 2019
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2
Hello everyone!

I'd like to get some help from someone who actually knows this knife making business and steel in general. I certainly don't. (Yet at least).

I cut my blade profile out of 80CrV2 carbon steel with an angle grinder and proceeded to work on it with files. That's when I noticed two spots on my steel which were ridiculously hard. I had to break out my diamond files to get through them. I didn't harden the blade or anything. Just used my grinder before filing.

What I would like to know is what happened and how do I avoid it in the future. I'll post a picture once i get home in case that helps.

Thanks in advance!
-Simo
 
Fill out your profile showing your location in the world, might be a local knifemaker who could provide some local help. I know if you were in Baldwin Co, AL I'd be more than happy to invite you over to use some tools for knifemaking.

When you cut with an angle grinder small sections will get "red hot" and could well cool fast enough to harden in small spots as you describe. When you get cut close to profile, then cut slow so you don't heat any spots, and slowly remove any hardened spots might work for you.
 
A portaband is a good investment. I wished i forked over the money a lot sooner than i did.
 
Ken H> said:
Fill out your profile showing your location in the world, might be a local knifemaker who could provide some local help. I know if you were in Baldwin Co, AL I'd be more than happy to invite you over to use some tools for knifemaking.

When you cut with an angle grinder small sections will get "red hot" and could well cool fast enough to harden in small spots as you describe. When you get cut close to profile, then cut slow so you don't heat any spots, and slowly remove any hardened spots might work for you.
Click to expand...

Many time I see how people use angle grinder in wrong way when they cut steel.....most time if they cut half inch steel they cut in away as it is one inch steel and they create unnecessary temperature , heat .Of course quality cutting disk is must . I cut so far maybe over 150 blades /most hardened steel/ and never never get color on cut ....
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