Ranking of Steels in Categories based on Edge Retention cutting 5/8" rope

DennisStrickland said:
jim cts--20cp i could'nt find the alloy breakdown in Gators chart.thanks---dennis
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CTS 20CP

Carbon (C) 2.20
Chromium (Cr) 13.00
Manganese (Mn) 0.50
Molybdenum (Mo) 1.30
Silicon (Si) 0.90
Vanadium (V) 9.30

S90V

Carbon (C) 2.30
Chromium (Cr) 14.00
Molybdenum (Mo) 1.00
Vanadium (V) 9.0
 
Interesting - a little more vanadium and moly and finer grain structure in the 20P, but less chromium. Any issues with its corrosion resistance (asking hypothetically, since no one's likely to do testing for that ;) ).
 
JNewell said:
Interesting - a little more vanadium and moly and finer grain structure in the 20P, but less chromium. Any issues with its corrosion resistance (asking hypothetically, since no one's likely to do testing for that ;) ).
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I don't think there would be, but I am guessing.
 
JNewell said:
Understood. :)
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20CP has more Molybdenum in it and that should offset the lower percentage of chromium for corrosion resistance.

But the steels will use about 11% of their Chromium toward rust resistance and what is left over will form the carbides.
 
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Ankerson said:
20CP has more Molybdenum in it and that should offset the lower percentage of chromium for corrosion resistance.

But the steels will use about 11% of their Chromium toward rust resistance and what is left over will form the carbides.
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Thanks...I should have known that... ;)
 
thanks jim for the breakdown . no wonder you could tell little differance with 90v. very similar but i wonder if we'll see any major models offered besides sprint runs.--dennis
 
DennisStrickland said:
thanks jim for the breakdown . no wonder you could tell little differance with 90v. very similar but i wonder if we'll see any major models offered besides sprint runs.--dennis
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What Carpenter did is tweak CPM-S90V for knife blades making it easier to work with and from what I see in the alloy content the custom makers might be able to take it to 61 HRC or higher and that would put it in the S110V range if they can.

Yes it has possibilities. :D

We could be seeing a landmark steel here for the knife industry if Carpenter can mass produce it.
 
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Do you have plans to test and list results for any of the classic and cheaper steels?

1095, 440C, 8cr13MOV would all be interesting to see.

I'm sorry if you've been asked this before...this thread is getting gigantic.
 
Joben said:
Do you have plans to test and list results for any of the classic and cheaper steels?

1095, 440C, 8cr13MOV would all be interesting to see.

I'm sorry if you've been asked this before...this thread is getting gigantic.
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I plan to test as many as I can.
 
Ankerson said:
What Carpenter did is tweak CPM-S90V for knife blades making it easier to work with and from what I see in the alloy content the custom makers might be able to take it to 61 HRC or higher and that would put it in the S110V range if they can.

Yes it has possibilities. :D

We could be seeing a landmark steel here for the knife industry if Carpenter can mass produce it.
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I wanted to ask if you noticed any significant behavior differences between S90V and 20CP. Not in terms of edge retention, as they both seem to be in the same category, but rather how long the edge kept its razor sharpness. I've heard that finer grain structure contributes to this, and since 20CP is 2nd generation PM I was wondering if this difference was significant enough to be noticed in practical use.
 
Noctis3880 said:
I wanted to ask if you noticed any significant behavior differences between S90V and 20CP. Not in terms of edge retention, as they both seem to be in the same category, but rather how long the edge kept its razor sharpness. I've heard that finer grain structure contributes to this, and since 20CP is 2nd generation PM I was wondering if this difference was significant enough to be noticed in practical use.
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Haven't tested for that, but I will say that CTS-20CP is slightly easier to get that ultra refined edge on.
 
Jim, do you mail out your knives for Rockwell testing, or do you have a local source? Also, what's a reasonable price for having a test run? The blade on my tan M4 Manix reprofiled so easily with diamond hones on the Edge Pro that I'm seriously wondering what the blade hardness might be. Admittedly, much of my sharpening recently has involved steels like 20CV, CTS-XHP, 10V and the like, but the difference in ease of sharpening was so profound as to arouse my curiosity.
 
as to m4 , it rates closer to being a carbon steel with much less chromium & vanadian than 20v, cts, & 90v.although m4 might not cut quite as long as the mentioned alloys, it's lesser complexity makes it a champion in toughness. having tested m4 on massive amounts of cardboard i would certainly be satisified with its performance against any of the other alphabet alloys. slighly less edge endurance is shadowed by the great lateral stress achived by m4. it's charpy index is fantastic compared to many other super steela. i would be surprised if spydie was off in the heattreat since that company has championed m4 just about as much as any company. most cutting & chopping contests are using m4. i really like this alloy due to its toughness. remember the fastest horse may not always win the race.--dennis
 
Bronco said:
Jim, do you mail out your knives for Rockwell testing, or do you have a local source? Also, what's a reasonable price for having a test run? The blade on my tan M4 Manix reprofiled so easily with diamond hones on the Edge Pro that I'm seriously wondering what the blade hardness might be. Admittedly, much of my sharpening recently has involved steels like 20CV, CTS-XHP, 10V and the like, but the difference in ease of sharpening was so profound as to arouse my curiosity.
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That's interesting. :)

Sent you a PM...
 
M4 basically is a "suped up" carbon steel and carbon steels are very easy to re-profile compared to most stainless steels even when the carbon steel is at a high hardness level. I can re-profile a 10" blade Bowie knife in about 30 to 45 minutes or so as to about 3 hours to do a stainless Bowie!
 
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