NITRO-V heat treat

samuraistuart said:
This still doesn't make any sense to me at all. The steel is a sort of mix between AEBL and 14c28n, and with Sandvick saying that a sub zero is NOT required in 14c28n to get 59HRC.
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All I can tell you is what I have seen with this batch. The next run I do, I'll do a coupon with my blanks and won't sub zero quench it and I'll let you know what I find. The two steel you mention are very similar, except AEB-L has no Vanadium or Nitrogen, and 14c28n has no vanadium. Like I said, i was pretty surprised as well.
 
You may try a slightly lower quench temperature, less soak time and a faster quench, all of which reduces RA. Possibly increasing hardness.

Hoss
 
DevinT said:
You may try a slightly lower quench temperature, less soak time and a faster quench, all of which reduces RA. Possibly increasing hardness.

Hoss
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The two batches prior to this I hit my target hardness numbers 61-62. I'm not ruling out something going amiss due to the coil issue I had and the ensuing confusion on my part. I am really glad i bought a hardness tester. Not that I wouldn't have been able to tell something was up while grinding, but being able to confirm just how far off they are is reassuring for future runs.
 
What are the tempering numbers for Nitro-V? I'm getting between 62-63 HRC out of the dry ice. I'd like to temper to ~ 61.5 HRC. What temps should get me there?
 
Thanks Kevin. That gets you to 61.5 HRC? I just tested a batch of Nitro-V knives I made last week that I tempered @ 325˚ and I'm getting over 63 HRC readings.

Can someone post up the useful tempering ranges with temperatures, or a chart?


*Nevermind - Got the information from Aldo.
 
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I know it’s not Nitro but with my AEB-L testing I have done, I have gotten 64-65 after the cryo, and a 1 hour temper at 350 is showing me right around 63. I don’t have my own hardness tester, so I am doing coupons with my batches and having them tested by a friend who has a couple of his own hardness testers.
 
I am testing in several spots on the blank an giving the lowest reading. Also, I was mistaken. I forgot I had to straighten during second temper, and kicked up the temp to 375.
 
Thanks. My target was 61 for this blade. 450˚f got me there. Actually, I tested in 5 places. The average was 60.46. Two of the test spots were exactly 61.
 
On the advice if Ed Braun, I soaked them at 1375 for two hours and allowed them to air cool. I then did my usual heat treat with sub zero. Success. IMG_20180227_161149577.jpg
 
I know I saw a heat treat schedule/chart for nitro-v somewhere but can't seem to find it... I am specifically interested in a tempering chart or info. can anyone point me in the right direction?
 
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