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

Wowbagger said:
! ?
Mostly "?"
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Mostly ????????????????

This data is from Wittmann-komet / manufacturer / of this saw

Made of HSS-Cobalt M35 steel

A hardness of 67 Rockwell and 8
% cobalt alows user to cut extreme
hard materials of more than 120 kp/
mm² toughness.

And this data is from westyorkssteel.com

Tempering
M35 high speed steel components can be tempered between 510-620°C. Triple tempering is recommended with a minimum of two hours at temperature per cycle. The component should be cooled in still air to room temperature between tempering treatments.

Temperature [°C] 540 560 580
Hardness [HRc] 67 66 65
 
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martinsanders said:
There is many reasons why one would out perform the other from the way they were sharpened to how they were tested. Different test materials alone can favor one blade over another. Using rope around 1/2 inch takes a lot of variables out because it's not thick like cardboard or too thin. Not too hard like wood or soft like vegetables. Off the top of my head the reason that I would check first would be to ask if the convex ground was stropped and the flat ground not. When there is a big difference like 50% I have found it usually is a "wire edge effect". Just a guess but you could start there and keep investigating because there shouldn't be that big a difference with the same blade steels, thicknesses and geometry.


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To speed up the test , I cut Kevlar /densely woven ballistic cloth / on a soft wooden backing. Flat grind knive is about 0.4mm behind edge , Convex one little thicker .Both knive was razor sharp before the test .
 
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Hey Ankerson,

Have you tested the edge retention on any of the newer knives in CTS-XHP from Cold Steel? Seems to me CS runs it a bit harder than Spyderco does. I seem to be getting better edge life in the CS products and I actually chipped the blade on my Recon 1 doing some misguided chopping ;)
XHP is tough steel but not as tough as rocks!
 
Cycletroll said:
Hey Ankerson,

Have you tested the edge retention on any of the newer knives in CTS-XHP from Cold Steel? Seems to me CS runs it a bit harder than Spyderco does. I seem to be getting better edge life in the CS products and I actually chipped the blade on my Recon 1 doing some misguided chopping ;)
XHP is tough steel but not as tough as rocks!
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Yeah, I was the one who tested the 1st one and put out that it was 63.5, it's in the list.
 
Natlek said:
Two knife, both are made from the same HSS-E circular saw , 67 rockwell hardness and 2.5mm thick .So HT factor is out of the equation ..One knife is grind flat , second convex . And convex grind knive outperform the other one by 50% . Why ?
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When grinding hardened steel there is a great chance of overheating and ruining the blade. That's the only reason I can think of.
 
Anybody know about s390 by Bohler-Uddeholm. It's supposed to be close to T-15 and runs about 70Hrc. It's composition is C1.23-1.33 ; W: 5.70-6.70; V: 2.70-3.20;
Cr: 3.80-4.50; Mo: 4.70-5.30; Co: 8.00-8.80;
Mn: 0.40; P: 0.030; S: 0.030; Si: 0.45; I'm just wondering if anyone has any experience with it or knowledge of it beyond rumors. Thank you.


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Zagorov said:
When grinding hardened steel there is a great chance of overheating and ruining the blade. That's the only reason I can think of.
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Both blade was grind with wet stone by hand on file jig . So , no chance for overheating . These are high-alloyed steels with a lot of carbide . My knowledge of chemistry of steel is very little but is it possible that the reason is this .....The V grind is extremely thin edge and there is little material to hold carbides while convex has more meat in it and better hold that carbides ? Simply put, in the V grind instead to wear carbide fall ?
 
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Ankerson said:
Yeah, I was the one who tested the 1st one and put out that it was 63.5, it's in the list.
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Oh jeez, sorry, I didn't see it there. The Ultimate hunter. Impressive! Right there with the GB M4 folder. I just got an Ultimate hunter-impressive knife for the $$ Thanks again for all the hard work- You rock!
 
sodak said:
And I got one shortly after that test, before CS could have the chance to lower it....
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Don't think they've lowered it. I've bought several XHP Cold Steel knifes recently and have been sharpening and working with them. They give every indication that the steel is run pretty hard.
My Slycz Bowie will roll the edge if pushed hard; the Recon 1 and American lawman both chip (not easily) if pushed. And the edge retention is definitely better on the CS XHP than how Spyderco runs it.
Bear in mind this is not scientific (a la Cliff Stamp) but I didn't have a bias going in and the results have repeated enough for a comfortable conclusion.

FWIW I really wish CRK would make a Sebenza in CTS-XHP and run it about 61 Rockwell. XHP edges polish up so nicely! :)
 
Natlek said:
To speed up the test , I cut Kevlar /densely woven ballistic cloth / on a soft wooden backing. Flat grind knive is about 0.4mm behind edge , Convex one little thicker .Both knive was razor sharp before the test .
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I quote myself :D

Hmmmmm..... I changed the backing / instead of wood i use plastic. End the V grind start again to cut Kevlar ..... ? On the wood it start to pull Kevlar in the wood .....but convex still cut in wood ?

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Natlek said:
Both blade was grind with wet stone by hand on file jig . So , no chance for overheating . These are high-alloyed steels with a lot of carbide . My knowledge of chemistry of steel is very little but is it possible that the reason is this .....The V grind is extremely thin edge and there is little material to hold carbides while convex has more meat in it and better hold that carbides ? Simply put, in the V grind instead to wear carbide fall ?
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Simply put yes.
 
Cycletroll said:
Don't think they've lowered it. I've bought several XHP Cold Steel knifes recently and have been sharpening and working with them. They give every indication that the steel is run pretty hard.
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I hope you're right. CS's spec is lower than what Ankerson got when he got it hardness tested. Mine seems to be nice and hard also, I really like this steel and this knife!
 
sodak said:
I hope you're right. CS's spec is lower than what Ankerson got when he got it hardness tested. Mine seems to be nice and hard also, I really like this steel and this knife!
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And it's only that one model too from my understanding.
 
Not sure why all the bagging on hinderer.. Some of my favorite knives

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Blowpop said:
Not sure why all the bagging on hinderer.. Some of my favorite knives

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Speaking for myself. My opinion is just one of many differing opinions. No reason why you can't buy and enjoy the knives that appeal to you.:)
 
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