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Re-Heat Treat to Straighten Blade?
#6845953
08/05/17 02:50 AM
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Joined: Feb 2011
Posts: 1,185
Misfire
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I want to preface this question by saying that besides the basic concept of heat treating blades I don't know too much about it. I send all my blades off for heat treat.
I have some blades that were heat treated 5 or 6 years ago that I've finally got interested in finishing and I noticed that one of them has a fairly decent warp in the tip. Until recently this warp has remained hidden under a thick layer of dried peanut oil.
Is it possible to send this blade back out for re-heat treat with the possibility of straightening or is it a loss? The blade is 3/16" O1.
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"I wanna go fast" -Ricky Bobby
"Mind bottling isn't it?" -Chazz Michael Michaels
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Re: Re-Heat Treat to Straighten Blade?
[Re: Misfire]
#6846102
08/05/17 11:59 AM
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Joined: Jan 2011
Posts: 65,517
SnakeWrangler
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I want to preface this question by saying that besides the basic concept of heat treating blades I don't know too much about it. I send all my blades off for heat treat.
I have some blades that were heat treated 5 or 6 years ago that I've finally got interested in finishing and I noticed that one of them has a fairly decent warp in the tip. Until recently this warp has remained hidden under a thick layer of dried peanut oil.
Is it possible to send this blade back out for re-heat treat with the possibility of straightening or is it a loss? The blade is 3/16" O1.
.
Short answer is yes.....first needs to be annealed, then straightened, then re-hardened and tempered...... You can easily anneal then straighten yourself with a torch....then send out for heat treatment....
I believe in science and I’m an insufferable [censored] Actually, BBC is pretty damn good "You Cannot Simultaneously Be Politically Correct And Intellectually Honest!"
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Re: Re-Heat Treat to Straighten Blade?
[Re: Misfire]
#6846156
08/05/17 01:36 PM
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Joined: Feb 2011
Posts: 1,185
Misfire
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That sounds easy enough. I actually have a pottery kiln that will take the steel to non-magnetic. I simply heat and then let cool? Does this need to be done more than once and is there a particular "soak" time at non-magnetic?
Thanks for the help!
.
"I wanna go fast" -Ricky Bobby
"Mind bottling isn't it?" -Chazz Michael Michaels
.
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Re: Re-Heat Treat to Straighten Blade?
[Re: Misfire]
#6846162
08/05/17 01:42 PM
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Joined: Jan 2011
Posts: 65,517
SnakeWrangler
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You should be able to google annealing that steel....
I believe in science and I’m an insufferable [censored] Actually, BBC is pretty damn good "You Cannot Simultaneously Be Politically Correct And Intellectually Honest!"
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Re: Re-Heat Treat to Straighten Blade?
[Re: Misfire]
#6846621
08/05/17 10:25 PM
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Joined: Apr 2010
Posts: 5,452
bjankowski
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That sounds easy enough. I actually have a pottery kiln that will take the steel to non-magnetic. I simply heat and then let cool? Does this need to be done more than once and is there a particular "soak" time at non-magnetic?
Thanks for the help!
. If you can program your kiln. Ramp to 1500 ... 10 min Hold Cool to 1450 ... 10 min hold Cool to 1400 ... 10 min hold Cool to 1350 ... 10 min hold Cool to 1300 ... 10 min hold Cool to 1250 ... 10 min hold Cool to 1200 ... 10 min hold Let cool in to room temp over night in oven If you can't program your kiln; anneal it in vermiculite or ash. Get the blade to temp and let soak in vermiculite or ash 24 hours. It's also good to preheat vermiculite or ash buy inserting a buddy steel along with it. If I'm only doing one piece of steel I place another piece of steel in the material that is around 1500 degrees or more, so that when you put the piece you want to anneal doesn't cool too fast. Others might have a better way but this works for me. I do this after forging and normalizing then I anneal.
Last edited by bjankowski; 08/05/17 10:41 PM.
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Re: Re-Heat Treat to Straighten Blade?
[Re: Misfire]
#6846809
08/06/17 01:28 AM
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Joined: Aug 2005
Posts: 17,117
MikeC
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I just put the hardened steel in my oven and take it up to 1500° then turn the oven off and let it cool in the oven overnight. I never open the door on the oven until the next morning letting it cool very slowly. Steel is soft enough to work by then.
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Re: Re-Heat Treat to Straighten Blade?
[Re: MikeC]
#6847161
08/06/17 02:46 PM
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Joined: Apr 2010
Posts: 5,452
bjankowski
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I just put the hardened steel in my oven and take it up to 1500° then turn the oven off and let it cool in the oven overnight. I never open the door on the oven until the next morning letting it cool very slowly. Steel is soft enough to work by then. Thanks Mike; I've never done that. I have to anneal is when I'm finished with the forging process and I always have a five gallon bucket with vermiculite, been doing that a long time. When I first started making knives ( long ago ) and didn't have the right equipment I used files and rasps and tried heating them in fire and left them over night to cool, all I got was a lot of warped steel. Then I discovered ash or vermiculite and been doing that ever since, works for me.
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Re: Re-Heat Treat to Straighten Blade?
[Re: Misfire]
#6847262
08/06/17 05:14 PM
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Joined: Feb 2011
Posts: 2,154
Bush Monkey Knives
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Temper the blade while clamped flat or curved the opposite of the at rest Bend. No need to start over (probably).
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Re: Re-Heat Treat to Straighten Blade?
[Re: Misfire]
#6847265
08/06/17 05:15 PM
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Joined: Aug 2005
Posts: 17,117
MikeC
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Just to add, what I'm referring to is carbon steel. I've never tried it with stainless but I've never had a stainless blade warp either.
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Re: Re-Heat Treat to Straighten Blade?
[Re: Misfire]
#6847438
08/06/17 08:23 PM
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Joined: Feb 2011
Posts: 1,185
Misfire
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Awesome, thanks for the advice! I'll give the re-tempering a shot. If that doesn't work, I'll anneal it and send it back out.
"I wanna go fast" -Ricky Bobby
"Mind bottling isn't it?" -Chazz Michael Michaels
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