Cpm 4v heat treat

M

mendel314

Joined
Jul 30, 2016
Messages
13
Hello all
I just ordered a bar of cpm 4v waterjet cut into a set of chisels and a number of other edged woodworking tools. I am wondering if anyone here can offer me some guidance on heat treatment. From the datasheets, it looks like the heat treat protocol and response is pretty close to 3v, with 4v holding a few points rc higher. I know there is a big response to cryo from 3v, and was wondering what people here have found for 4v.

What austenitizing and tempering temperatures have people found to work well? Does cryo or subzero make a noticeable difference? The datasheet calls for sub-zero for improved dimensional stability, but does it improve other characteristics?

Thanks!
 
Hi Mendel !

I'm watting anwers too you. Something new about 4v heattreatment. Can you share with me ?
Thanks alot !
 
mendel314 said:
Hello all
I just ordered a bar of cpm 4v waterjet cut into a set of chisels and a number of other edged woodworking tools. I am wondering if anyone here can offer me some guidance on heat treatment. From the datasheets, it looks like the heat treat protocol and response is pretty close to 3v, with 4v holding a few points rc higher. I know there is a big response to cryo from 3v, and was wondering what people here have found for 4v.

What austenitizing and tempering temperatures have people found to work well? Does cryo or subzero make a noticeable difference? The datasheet calls for sub-zero for improved dimensional stability, but does it improve other characteristics?

Thanks!
Click to expand...

4v is nothing like 3v and should not be compared, 3v is much tougher but 4v has better wear resistance. I have done about half a dozen blades with 4v, all blades were RC tested at least 3 times each with results all between Rc 61.5 & Rc 62.5 for an average of Rc 62.

Plate quench with forced air between plates at 1950 - Blade has to be foil wrapped, do not attempt to remove foil until under 1000 degrees.

Tempered at 1000 for two hours - two times. Be sure to air quench in between tempers, do not let it sit in oven.

With the results I had, I did not even do a sub zero due to the high hardness already achieved.
 
Alan Davis Knives said:
4v is nothing like 3v and should not be compared, 3v is much tougher but 4v has better wear resistance. I have done about half a dozen blades with 4v, all blades were RC tested at least 3 times each with results all between Rc 61.5 & Rc 62.5 for an average of Rc 62.

Plate quench with forced air between plates at 1950 - Blade has to be foil wrapped, do not attempt to remove foil until under 1000 degrees.

Tempered at 1000 for two hours - two times. Be sure to air quench in between tempers, do not let it sit in oven.

With the results I had, I did not even do a sub zero due to the high hardness already achieved.
Click to expand...

Thanks you Alan, I gonna do the same as your method but with 2 hours dry-ice subzero immediately after quench.
 
Thanks Alan!

I quench in oil, double tempered at 1040 . after heat treatment its 61hrc. But i feel 3v sharpen than 4v. And s35vn holding eagle better than 4v. I thinking i had some wrong when HT. Can you tell me some suggestion to try again ?

Ps : I'm so sorry about my english. But honestly i really want to learn more about cpm 4v. Thanks
 
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