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AEB-l vs Nitro V Warping

Discussion in 'Shop Talk - BladeSmith Questions and Answers' started by scott kozub, Apr 24, 2018.

  1. scott kozub

    scott kozub Gold Member Gold Member

    281
    Jan 1, 2018
    So I did my first ever stainless knives in AEB'L and ground pre heat treat with no issues. I did one more blade and left a much thicker edge and it warped a lot. I must have had an uneven grind or moved it around in the dry ice.

    Reading up after I noticed all the concerns with AEB'L warping. I'm looking to make another steel order and I'm curious if people had better luck with Nitro V?
     
  2. JTknives

    JTknives Blade Heat Treating www.jarodtodd.com Knifemaker / Craftsman / Service Provider

    Jun 11, 2006
    Generally people don’t grind AEB-L befor heat treating it. It is a picky steel but o de you figure it out its not to bad. If I remember correctly nitro v was having cracking issues
     
  3. kuraki

    kuraki Fimbulvetr Knifeworks

    Jun 17, 2016
    I've found no correlation between alloy and warping. They all warp sometimes.
     
    Rhinoknives1 and Justin Schmidt like this.
  4. scott kozub

    scott kozub Gold Member Gold Member

    281
    Jan 1, 2018
    I found it easier to grind after heat treat anyways. I got crisper lines. Pre heat felt a little grabby on the belt and it was hard to hold the blades steady.
     
    Storm W and kmf600 like this.
  5. AVigil

    AVigil Adam Vigil knifemaker working the grind Knifemaker / Craftsman / Service Provider Platinum Member

    Feb 17, 2009
    I grind AEB-L to almost finish pre heat treat and they come back from Tru Grit perfectly straight every single time.

    The only time I grind post heat treat is when the blade is 1/8" or less.
     
    ChristoDart likes this.
  6. Rhinoknives1

    Rhinoknives1 KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 1, 2013
    What Scott said^^^ I’ve done all of my grinding for all of my diff Stainless Steels Post HT over the years.. 440C ATS-34 CM-154 AEB-L & Nitro-V etc. ————// I profile , put a Scandi type grind on them, off to PAUL Bos at Buck for HT & Cryo treatment and I do a full Flat Grind!! No warping issues!!
     
  7. JTknives

    JTknives Blade Heat Treating www.jarodtodd.com Knifemaker / Craftsman / Service Provider

    Jun 11, 2006
    Most of the ARB-L that comes to me is the crazy thin stuff that is large kitchen blade sizes. Thy can get a bit wild.
     
    Willie71, Ken H> and Justin Schmidt like this.
  8. Rhinoknives1

    Rhinoknives1 KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 1, 2013
    V
    3/32”?? Or the metric equivalent? That’s what I use in AEB-L & Nitro-v
     
  9. SirSpice

    SirSpice

    50
    Jun 14, 2013
    I've had major warping issues with Nitro-V. I only profiled before heat treat, and I did a plate quench. Every single blade came out of the plate quench with a major warp. Same thing happened to the guy from Simple Little Life. S30V and S35VN came out as straight as they went in. I'm pretty much resigned to the fact that I'll need to correct the warp during tempering.
     
  10. cotdt

    cotdt

    Oct 2, 2006
    Any updates on the latest batch of Nitro-V? It sure comes straight and flat, almost like precision ground. I hope it stays that way when I heat treat it
     
  11. Tom Lewis

    Tom Lewis

    Feb 24, 2000
    I have used JT's heat treating for AEB-L. He does a great job.
    I grind the bevels on after the heat treatment. I have found the AEB-L post heat treatment is not much different to grind than CPM 154 pre-heat treatment.
     
  12. Isley

    Isley

    35
    Feb 26, 2016
    I just posted a question related to this one, "Cold Rolled Skin", if this holds any water it may address some warp issues with AEB-L relative to other steels. I dunno.
     
  13. daizee

    daizee KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Dec 30, 2009
    We had some issues - learned to not correct the warp between plate-quench and sub-zero. We're mostly doing kitchen thickness blades.
    Not sure if grinding the bevels more evenly (half one side, half the other, then again) helped. But we did add a longer hold at 1750F in the hopes it would act as stress relief before the final ramp to 1950F. But we've only done maybe 8 or 9 AEB-L blades so far, so take that all with a grain of salt.
     
  14. JTknives

    JTknives Blade Heat Treating www.jarodtodd.com Knifemaker / Craftsman / Service Provider

    Jun 11, 2006
    Thank you, we try very hard to provide a top notch heat treat. It’s funny bevause when we started I hated doing AEBL. Now I quite enjoy it. I have the process so ironed out that I almost never get a warp anymore. But by far A2 is the most stress free steel to heat treat.
     
    daizee likes this.
  15. comet_sharp

    comet_sharp

    255
    Aug 22, 2016
    Noted, after seeing the Japanese using hitachi skd and sld steels ive been very curious to try A2 or D2 on a kitchen blade. They way the HT the hitachi equivalent is outstanding.
    -Trey
     
  16. JTknives

    JTknives Blade Heat Treating www.jarodtodd.com Knifemaker / Craftsman / Service Provider

    Jun 11, 2006
    My wife’s favorite kitchen knife steel is A2. She has 2 in A2 and she uses them more then any of her other knives. She uses them every day and I think I sharpen them around 3 times a year. I highly recommend it as a kitchen knife steel. Very stable during heat treat.
     
    Storm W likes this.
  17. KNelson

    KNelson

    103
    Jan 9, 2019
    Just did a batch of 5 8” knives in AEBL and some A2, for poops and grins I did a 1200 degree 2 hour stress relief. ( I was having warping issues with A2 without it) each blade came out perfectly straight after HT.
     
  18. Brian77

    Brian77 KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Nov 27, 2014
    Jt, I would love to hear a few more details. I am experimenting with AEBL for kitchen knives, and 52100. I love to Sharpen knives and look for steel that easily maintains a fine edge. Apparently A2 would be a candidate? How is it to grind and sharpen on kitchen knives that are thin?
     

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