Need Help /420 C Stainless

D

Drop point

Joined
Jan 11, 1999
Messages
73
Can anyone give me some information on the requirements for heat treating and tempering 420 V? I also need annealing information as I have just received three blades back that I had heat treated by a small 1 man heat treat sercive and they are soft. I checked them this morning here at work and they check between 21 and 40 Rockwell C scale.How hard should this steel be before treatment? They show the usual signs of being treated, but don't seem to be any harder than they were when I was grinding them. Any help will be appreciated.
Thanks
Mike C


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mconner@luminatorusa.com


[This message has been edited by Drop point (edited 28 January 1999).]
 
Go to Crucible's website for heat treating and annealing info. I am not sure waht happened but I would almost bet that you will want to anneal these before re-heat treating. Darrell is the 420-v expert here for sure but I see he is gone for a week. The web site addy is www.crucible.com or www.crucibleservice.com
Hope this is of some help! Rob
 
Hate to say this but the annealed hardness for 420v is BHN275 or around 30RC.
my test blades came out of the quench at 59RC and then went to 65+RC after the 24hr cryo quench.
I have Crucibles data sheet for 420v and can email it to you with my heat treat specs.

ED
 
The recommended RC for 420V when used for cutting tools is 58. I have the specs from Crucible, but not digitally. If you can't find them on crucibles website, I can type the stuff in and send it to you. I believe this steel requires precision heat treating and if I were you I'd send the blades to somebody in the States who has the experience and the equipement to handle 420V. Perhaps Crucible can direct you to somebody. I hope the blades can be reannealed...

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www.wilkins-knives.com



 
paul bos told me he wont heat treat 420v because the temps are so high it will cut his oven life in half....ive been told the guys at texas knife supply are heat treating it...needs to be done to spec or youre wasting your time and money...
 
Phil Wilson did a blade I ground out of CPM 10-V, and he mentioned he will be able to take in a few blades at a time to HT. He subzero quenches also. His phone # is 510-455-9474.
Harry Jensen

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Hey Harry, I just did some 10-V blades and the stuff was a breeze to heat treat, very responsive. The austenising temp was only 1850 and the blades came out of the oven before cryo at Rc 68! Dont know how they will be for wear resistance yet, waiting to see what the customer thinks...

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www.simonichknives.com
 
I don't recall what temp Phil took mine up to, but I think it was higher than 2K F. The hardness after (I believe) 2 tempering cycles was 59-60 HRC. IIRC, to get full transformation to martensite, most, if not all of the CPM products need to be taken past the 2,000F point. May be mistaken...been wrong plenty before (if you don't believe me, just ask the Missus)
wink.gif

Harry Jensen

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