Heat treating CPM 3V to 63 rc

well i know i can quench plenty fast as i have done 3/32 O1 in the plates and after 400f temper my O1 ends up 62-63 (makes kitchen knife blades nice and flat for post heat grinding )

not sure how much the pressure comes into play but i like to smash the hell out of the blades :)
 
Just took the new 3V blade out of the oven and quenched it between the aluminum plates. I got between 62 and 63 as close as I could tell. I did two things different this time which is something I don't normally do because I don't know which helped the hardening. I changed the lot of steel and I froze the quench plates. I was planning on redoing the other blade anyway and also needed to get the new blade hard as soon as I could, so I did both at the same time to see if it would work on the new blade. I will try the frozen quench plates on the old steel this weekend to see if it will harden the same as the new lot of steel.
 
Hmathews said:
Just took the new 3V blade out of the oven and quenched it between the aluminum plates. I got between 62 and 63 as close as I could tell. I did two things different this time which is something I don't normally do because I don't know which helped the hardening. I changed the lot of steel and I froze the quench plates. I was planning on redoing the other blade anyway and also needed to get the new blade hard as soon as I could, so I did both at the same time to see if it would work on the new blade. I will try the frozen quench plates on the old steel this weekend to see if it will harden the same as the new lot of steel.
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That's great news! Please keep us up to date on your findings.

So I guess 3V is not really an air-hardening steel after all.
 
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also might wan to see what it RCs at after the LN bath before the temper as it might pick up the point or 2 for you depending on RA
 
AcridSaint said:
I will also be interested to see how this turns out. I'd like to know where the 20-30% comes from and if that's across the board for steels and materials cut. We're talking about a ~70-100%+ increase in cutting ability in three points on the top end of the steel.

I'd also like to see more about the sharpening angle and how constant that is from steel to steel. I'd be very interested in some measurements of this.

Always open minded, I can be won over with results.
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Well Crucible's own datasheets do show 70-100% increase with 3 rc points:

crucibles110vs90v.jpg


But I think this is rather conservative. If you give the 3 rc points harder steel a more acute edge, the edge lasts well over twice as long, more like 4x as long in my experience.

It seems to be across the board so long as cryo is not used. When cryo is used, you can get weird results like edge retention increasing with softness.
 
I don't see anything about 3V on that graph, I would be really interested to see this linear scale of edge retention increase across platforms. I'd also like to see it in a greater RC range, or are we now only talking about the 60+ RC values?
 
the 3V datasheet shows Rc 58 - 6 adhesive wear, 60 - 7, 62 - 8

What that means? Umm, closest it shows in the chart is that 6 is on the high end for Cruwear at 62 (5-6), and 8 is on the low end for M2 at 62 (8-10)

don't even know if adhesive wear is all that relevant though, abrasive is more important imo.
 
got a necro like and felt i woudl update i have made a 3v chopper at 61rc and have my own camp knife in PD1 at 62. they are beasts that i have no problem beating ht hell out of when chopping. i dont twist or go out of my way to side load the blades and they are ground in chopper/camp knife grinds
 
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