PSF-27 Heat Treatment Results

[Michael.Drinkwine]

I recently heat treated some test coupons of DanSpray PSF-27, a PM version of D2 with 0.07% Nitrogen added. Below is the data from my tests, it should give you a good starting spot for dialing in your own heat treatment. I would recommend starting your own tests at 1900° F if you are using cryo and low-temp tempers.

This steel was donated by @daizee for the Knife Steel Nerds steel toughness database project, and he suggested sharing it freely. Check out Larrin's thread with more toughness info here.

Michael Drinkwine

*AQC is "As Quenched with Cryo"

 

[DevinT]

Good stuff MD

Hoss

 

[DeadboxHero]

I recently heat treated some test coupons of DanSpray PSF-27, a PM version of D2 with 0.07% Nitrogen added. Below is the data from my tests, it should give you a good starting spot for dialing in your own heat treatment. I would recommend starting your own tests at 1900° F if you are using cryo and low-temp tempers.

This steel was donated by @daizee for the Knife Steel Nerds steel toughness database project, and he suggested sharing it freely. Check out Larrin's thread with more toughness info here.

Michael Drinkwine

*AQC is "As Quenched with Cryo"
View attachment 1108055

Nice curves, 1875°F and 300°f- 400°f is looking great.

 

[cotdt]

I wonder if the edge would hold up against chippiness at 64 rc...

 

[Michael.Drinkwine]

I wonder if the edge would hold up against chippiness at 64 rc...

Probably not, but finding out things like that for certain is the whole point of the testing!

Michael

 

[DeadboxHero]

I wonder if the edge would hold up against chippiness at 64 rc...

15v at 64rc is doing just fine with torq on brass.

I'm sure PSF27 will be fine, only one way to find out I suppose.

Of course, just depends on the geometry, use and user at the end of the day.

 

[Larrin]

This seems as good a place as any to share my D2 and CPM D2 heat treatment results. 30 minute hold at austenitizing temperature, plate quench, cryo, two tempers for 2 hours each.

 

[cotdt]

So cool, it's a steel that gets hard, this data inspires me to make something with the CPM D2 stock I have.

 

[Willie71]

This seems as good a place as any to share my D2 and CPM D2 heat treatment results. 30 minute hold at austenitizing temperature, plate quench, cryo, two tempers for 2 hours each.
View attachment 1108483
View attachment 1108484

Perfect. I know what samples to make now.

 

[Willie71]

Probably not, but finding out things like that for certain is the whole point of the testing!

Michael

I like your thinking!

 

[BluntCut MetalWorks]

My unconventional ht: aust 1850F soak 30-45minutes, plate quench, cryo

D2 = peak 67rc, 400F tempered 65rc, 425F tempered 64.5rc
psf27 = peak 66.5rc, 400F tempered 64rc

*when ht targeted for max hrc, add 0.5-1rc to #s above.