20CV composition varies from spec

The plates will draw the heat away just fine. I plate quench fully beveled and distally tapered large blades all the time. It is best to apply the clamp to the plates at the spot about 1" forward of the ricasso. One clamp only works bets.
 
attila. said:
I don't understand what you mean. Would you be so kind as to elaborate?
Click to expand...
With these monsters of about 17 kg Al ... time to room temp is 1min, now you try oil and get the result
IMG-20170405-_WA0005.jpg

Of course this is a bit non-standard, but I claim that any piece of Al that is thicker than 20mm(+ air from the compressor) will be quite sufficient for a faster time than the oil.
 
I read that many knife maker use air from the compressor .................... but that will result in unequal cooling ? No bad effect on steel ?
 
Whether or not plate quenching is faster than oil doesn’t matter that much for air hardening steels. It is significantly faster than air.
 
After second temper it stayed at 61-62 which is what I was shooting for. This was just a coupon so I didn't grind it. From here I'll do some knives but I'm going to grind a fair amount pre HT especially with 20CV. It's hard enough to finish with only a small amount of grinding to do after HT I don't want to complicate things :-)
 
Robert Erickson said:
After second temper it stayed at 61-62 which is what I was shooting for. This was just a coupon so I didn't grind it. From here I'll do some knives but I'm going to grind a fair amount pre HT especially with 20CV. It's hard enough to finish with only a small amount of grinding to do after HT I don't want to complicate things :)
Click to expand...
That sounds good, I am a little surprised that the rc didn't change after LN..Must have been very little RA left???
 
I'm not sure. It was my first coupon in 20CV so maybe a few more would be a good idea to get more data points.
 
Larrin said:
Whether or not plate quenching is faster than oil doesn’t matter that much for air hardening steels. It is significantly faster than air.
Click to expand...

Roman Landes words ............
The oil quench is suitable for any steel out of the air hardening classes. The thin cross sections get higher hardness after quench (greater volume fraction of martensite) and a less stabilized volume fraction retained austenite. (The volume fraction of RA can be expected (near guess) between 20 and 30% or even higher)
Click to expand...
 
Larrin said:
Do his words contradict what I said?
Click to expand...
Not at all :)But they contradict with this post ...............

chumaman said:
With these monsters of about 17 kg Al ... time to room temp is 1min, now you try oil and get the result

Of course this is a bit non-standard, but I claim that any piece of Al that is thicker than 20mm(+ air from the compressor) will be quite sufficient for a faster time than the oil.
Click to expand...
 
You must log in or register to reply here.
Back
Top