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Nitro-V- third time's (not) a charm

Discussion in 'Shop Talk - BladeSmith Questions and Answers' started by Kevin McGovern, Apr 13, 2018.

  1. Kevin McGovern

    Kevin McGovern KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 31, 2015
    I have used a lot of AEB-L, and lately, Nitro-V. I haven't seen much difference in performance over AEB-L, but I have had this happen three times now. A crack that I discovered while grinding. The hardness is the same as I do my AEB-L at (61-62), but this issue is a bummer. When this stock is gone, I'm back to AEB-L. IMG_20180413_102306798.jpg
     
  2. john april

    john april KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Feb 27, 2006
    yuk ! sorry about the wasted time. but thanks for the warning.
     
  3. timos-

    timos- KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Oct 22, 2012
    wow, that really sucks. I guess I have been lucky, finished about 10 nitro v blades now and none of them have been cracked like yours and others i have seen. I would ask Brad @ Peters about this steel....he has done mine good so far.
     
  4. i4Marc

    i4Marc KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Oct 19, 2011
    I'm also about a dozen blades into Nitro-V and no problems yet. I hope I don't have one of those waiting for me. I hope you get that figured out.
     
  5. Kevin McGovern

    Kevin McGovern KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 31, 2015
    I've done about 20 others that had no issue. Several from the same batch with no issues as well.
     
  6. Rhinoknives1

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

    Jul 1, 2013
    I wonder what’s causing this? I haven’t had any issues with N-V at around 30 blades.. Sorry for the headache you’re having!
     
  7. AVigil

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

    Feb 17, 2009
    I think @Charlie Mike had the same trouble when using Nitro V
     
    Charlie Mike likes this.
  8. Charlie Mike

    Charlie Mike Sober since 1-7-14 (still a Paranoid Nutjob) Knifemaker / Craftsman / Service Provider

    Nov 1, 2000
    Yeah, I don't use it.
     
  9. Stacy E. Apelt - Bladesmith

    Stacy E. Apelt - Bladesmith ilmarinen - MODERATOR Moderator Knifemaker / Craftsman / Service Provider

    Aug 20, 2004
    What was the HT regime, and who did it?
     
  10. Willie71

    Willie71 Warren J. Krywko. Part Time Knifemaker Knifemaker / Craftsman / Service Provider

    Feb 23, 2013
    This comes up often enough. Has Aldo addressed the problem?
     
    Charlie Mike likes this.
  11. Darrin Sanders

    Darrin Sanders Knifemaker Moderator Knifemaker / Craftsman / Service Provider

    May 6, 2009
    Nitro-V is all hype anyway. Its basically 14C28N with a fancy name. In my testing, 14C28N offers very little, if any, gain in performance, with a significant increase in cost over AEB-L. That doesn't even take the cracking problem into consideration.
     
    linuxology, Willie71 and Josh Rider like this.
  12. Kevin McGovern

    Kevin McGovern KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 31, 2015
    I
    I did the heat treat. 1725- 20 minutes, plate quench. Ramped oven to 1975. Inserted blades once oven stabilized. Once oven got back to 1975- 12 minutes. Plate quench to too temp, straight into DI bath for 20 minutes. Tempered at 325- for two 1 hour cycles. RC was 61-62 at completion.
     
  13. Stacy E. Apelt - Bladesmith

    Stacy E. Apelt - Bladesmith ilmarinen - MODERATOR Moderator Knifemaker / Craftsman / Service Provider

    Aug 20, 2004
    It might help to add a 300F snap temper before the cryo.
     
    knife to a gunfight likes this.
  14. DeadboxHero

    DeadboxHero Triple B Handmade Knives, Big Brown Bear Knifemaker / Craftsman / Service Provider

    Mar 22, 2014
    Higher working hardness is the advantage over aebl.
    Also more carbon then 14c28n and more available.
     
  15. Kevin McGovern

    Kevin McGovern KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 31, 2015
    Won't that negate the sub zero benefit?
     
  16. Willie71

    Willie71 Warren J. Krywko. Part Time Knifemaker Knifemaker / Craftsman / Service Provider

    Feb 23, 2013
    Any retained austenitite that stabilizes during that temper will not convert once in the dry ice. Not all will stabilize though.

    It’s preferable to be able to go straight into the dry ice or LN.

    I’ve done over 100 air hardening steel blades now, and have put test samples in LN for up to 48h prior to tempering. I’ve had zero cracks so far, so three cracked blades in the same steel points to a steel problem, not a process problem.
     
    Darrin Sanders and Josh Rider like this.
  17. Stacy E. Apelt - Bladesmith

    Stacy E. Apelt - Bladesmith ilmarinen - MODERATOR Moderator Knifemaker / Craftsman / Service Provider

    Aug 20, 2004
    I don't use a snap temper either, but suggested it as a possible cure for his cracking during the DI bath.

    In industry, it is more of an issue with cryo and complex parts.
     
    Willie71 and Kevin McGovern like this.
  18. Kevin McGovern

    Kevin McGovern KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 31, 2015
    Thanks gentlemen .
     
  19. Huntsman Knife Co.

    Huntsman Knife Co. KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Sep 10, 2010
    I was very happy with my machete run I did in Nitro V but there is clearly a problem with some batches of this material. Ill be staying away from it until they get it sorted out.
     
  20. ShannonSteelLabs

    ShannonSteelLabs KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Sep 9, 2015
    Damn. Im hoping my nitro v is in the good batch. It seems that lots of people are having issues with it. Makes me nervous as i have nearly 3.4 feet left from a order (only sold in 4 foot lengths.)
    I will be keeping an extra close eye on the customers who have this steel in knives i have made.
     

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