CPM 420V

B

bald1

Joined
Oct 3, 1998
Messages
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Again, here's some specs...this time on CPM 420V:

-=[Bob]=-

CPM 420V (AISI 420 Mod.)


Description
CPM 420V is a unique tool steel made by the Crucible Particle Metallurgy process.
It is designed from a martensitic stainless steel base analysis with added high
carbon and vanadium for exceptionally good wear resistance. CPM 420V offers
significant improvements over CPM 440V in both wear and corrosion resistance.

The exceptional wear resistance and good corrosion resistance of CPM 420V make
it an excellent candidate to replace 440C and other corrosion and wear resistant
materials, particularly where increased wear resistance is a primary concern.
Typical
Applications
Injection and extrusion screw and
barrel components
Wear components for food, plastic,
and chemical processing equipment
Pelletizing knives
Slitters, cutters, chipper knives
Bearings, bushings, cams, gears,
valves
Rolls
Chemistry
C 2.20
Cr 13.00
V 9.00
Mo 1.00
Heat
Treatment
ANNEALING TEMP.
TYPICAL ANN. HDN. BRINELL
PREHEAT TEMP.
AUSTENITIZING TEMP.
QUENCH MEDIUM
TEMPERING TEMP.
TYPICAL APP. HARDNESS HRC.
1600/1650F
255/277
1500/1550F
1950/2150F
AIR/OIL/SALT
400/750F
56-58
 
Questions for Mr. Ralph:

Do you think CPM 420V is better than 440V? How?

I spoke with Peter Herbst at the Bern Knife Show and he makes almost all his knives from 440V. He told me he reccomends hardening 440V to only about RC58. Says it is just as good at edge holding and is more durable.

What do you do regarding hardening and tempering the 420V?

I've taken 440V to RC 62 and it seems to be fine.
 
I take my 420v to 58 also. After a bend test
I made that decission. It made about a 3 percent difference in the cut factor but the knife did not snap when bent . It seemed to be the optimal point where cutting and bending were the best in my opinion. Note that most makers have there own heat treat ing procedures.. So what one does the other may not.
As for 440v and 420v testing . My tests had the 420v doing a better job staying sharp. They both are in a class above ats bg42 440c ect. I just found the 420v to be a bit tougher..
 
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