Cpm d2 pm

David Loukides

David Loukides

Joined
Mar 17, 2006
Messages
1,363
Hi Guy's,
I have a important customer that want's a presentation D2 knife made. It Has to be a top notch user.
It will have a hollow ground 5.5" Blade, spine around 3/16" thick.
Made by Stock removal.
My Question is Which D2 to use. Regular or CPM D2 PM?
Heat treat Plan's;
All ramps and holds to austenized temp.
Aluminium Plate Quenched.
I Plan to put a Cyro into the double tempering and final temper around 59rc.
All comments welcomed.
EXPERIENCED COMMENTS GREATLY APPRECIATED!!!!!
Dave
 
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i use PM steel any time i can get it in that grade as it jsut works better finishes nicer, and many time respond better in HT (alowing you to gain a point or 2 in hardness withought having to give up toughness )
 
Sir, I use both regularly. When it comes to a highly polished finish I use CPM. I have never found a void or small pit while grinding. I haven't seen a difference in heat treat (recipe is the same) maybe a point. Any way it definitely seems to take a higher finish.
 
CPM has finer grain, and better alloy distribution. It is worth the extra cost to me.

If any steel that I wish to use is available in a CPM form, I opt for that.
 
Although regular D2 makes great user knives for this you should probably get the Cpm. Like Stacy said finer grain and probably finish a bit better. I have a lot of 3/16 Bolher K110 D2 and when you go thru the pain of getting it to a high polish it is neat to look at the webbing in the steel. Don't know if that occurs in the CPM or if you would care for it. Either one I would take it to a pretty high grit before hardening. I usually go to a good 600 before HT if I am going to polish it and figure on using up some paper after. I do ramp, then 1850 for 45 mins to make sure on the soak, then plate quench till I can handle it, then into cool water, wipe off and into dry ice slurry. Wish I had Dewar and could get Liquid nitrogen closer than 100+ miles. Then temper at 400f for 2 hours, then back into the dry ice slurry for 1/2 hr then another temper at 440f. I come out above 60.

I think D2 is a lot better steel than many give it credit for.
 
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bladsmth said:
CPM has finer grain, and better alloy distribution. It is worth the extra cost to me.

If any steel that I wish to use is available in a CPM form, I opt for that.
Click to expand...

That about sums it up for me, too.
 
Thank You for your replies,
I have now decided on the CPM D2 PM.
My normal target Is 58 to 60 Rc. If I Cyro will the new target be 60 to 61Rc? Sounds brittle but from what I hear Lloyed say it is still tough?
Thanks Dave
 
I like cpm d-2 at Rc60,any harder seems to get chippy,I basicly do the same as Jim,but I do a 15 min soat at 1200 and 15 min at 1600 and then to 1850 for 40 min.I also use LN for cryo,second temper at 440 in my kiln gets me right at 60.
Stan
 
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