Quenching an O1/15N20 blade question

[weo]

Hello all.
Like the title implies, I've got a Damascus O1/15N20 carving knife ready to HT, and after reading the O1 sticky, my question is about the oil to use.
I've got 5 gal of Parks 50 and another one of vegetable oil. The sticky says that Parks 50 may be a bit too fast for the O1. My veggie oil isn't canola, but rather some used oil from a Chinese restaurant that I filtered and dewatered (I ran my diesel on SVO for a number of years).
Which oil would you recommend I use?
Thanks.

as always
peace and love
billyO

 

[JTknives]

I would not use use parks 50 at least not at first. It's fine for 15n20 but not somthing I would use on O1. I use parks AAA but if I did not have that or the money for an official slow quench oil I would use heated canola oil. It's cheep and when heated to around 120° It works well on 15n20 and O1. I'm normaly not for the use of weird non standard quench oils but canola has proven its self over and over. I actually have a sword quench thank filled with it. It will eventually be replaced with AAA and many build a second to hold #50 but until then the conola works wonders when heated.

P.S. I would ditch the mistery oil and just buy some real canola oil.

 

[scott.livesey]

parks 50 will work ok, heat it to 110*F or so. canola oil at 120*F is also a very fast oil. either would be better than used stuff https://www.researchgate.net/public...ling_Properties_of_a_Series_of_Vegetable_Oils

 

[JTknives]

parks 50 will work ok, heat it to 110*F or so. canola oil at 120*F is also a very fast oil. either would be better than used stuff https://www.researchgate.net/public...ling_Properties_of_a_Series_of_Vegetable_Oils

DO NOT HEAT your parks 50
Only heat this oil if its under 50deg and then only take it up to around 75deg. This oil is designed to be used at room temperature.

 

[scott.livesey]

this is from Park Technical Data:
50 QUENCH OIL produces high hardnesses in many types of steel ordinarily considered “water quenching”. In the initial stages of the quench, 50 QUENCH OIL cools like water. As the cooling nears the martensite formation range, this remarkable oil cools the steel slowly and uniformly to preclude cracking or distortion.
The recommended operating temperature range is ambient to 120oF.
50 QUENCH OIL is as effective at 50oF as it is at 120oF because of its low viscosity. This is a big advantage to many steel treaters who have oil quenching tanks without heaters. It also means lower consumption because oil dragout is greatly reduced
Typical Properties
Appearance: Light Amber Oil
Viscosity @ 100oF: > 5.8 cSt
Hot Wire @ 100oF: > 33.5 amps
Nickel Ball Time @ 100oF: 7 - 9 seconds
Flash Point: > 275oF
OPERATION:
Bath Parameters
Temperature: Ambient to 120oF
do it at whatever temp is most convenient for you. I have had best results when oil is 100*F to 110*F.

 

[JTknives]

Yes it preforums up to 120° but it's designed to be used between 50°-120°. If you heat it to 110° and quench a blade or blades your now over the 120° upper limit depending on the the volume of your tank. I have never had a problem getting great performance from #50 when used at the lower end of there temp range. I heat treat batches a lot of times and so I start at 75° and the temp goes up a bit after each blade. Once it hits 120° I stop and let it cool back down.