Which Steel Has the Best Edge Retention?

This is the best article yet.

Larrin is a genius. There is a formula in the article that you can use to see how much a steel will cut with a given hardness and edge geometry.

For example, Vanax Superclean

-157+15.8(60HRC)-17.8(30°inclusive)+20.9(13% Vanadium Nitrides) = 528 Total Cards Cut

Vs Elmax at 543 Total card cut with 60 HRC and 30° inclusive with 16% CrVc and 2% very hard vanadium rich MC type carbide.

Seriously, this article is a HUGE break through.
 
solreat, compliments!!!
Mi è davvero piaciuta l'idea di cercare un'equazione per la regressione lineare!
 
[QUOTE="DeadboxHero, post: 18561441, member: 376639"There is a formula in the article that you can use to see how much a steel will cut with a given hardness and edge geometry.
For example, Vanax Superclean -157+15.8(60HRC)-17.8(30°inclusive)+20.9(13% Vanadium Nitrides) = 528 Total Cards Cut
Vs Elmax at 543 Total card cut with 60 HRC and 30° inclusive with 16% CrVc and 2% very hard vanadium rich MC type carbide.[/QUOTE]

good stuff Larrin. do you have carbide contents of other steels in a different article? Is it ok to assume zero carbides and figure TCC from that? using -157 + 15.8*Hardness (Rc) – 17.8*EdgeAngle(°), a "Basic"(1095 or Hitachi White) steel knife at Rc64 and a 15* edge angle would give a TCC of 587. interesting, better than Bucorp 440C and almost as good as their N690. more surprising, is better than Vanax or Elmax shown above.
keep up the good work
scott
 
scott.livesey said:
good stuff Larrin. do you have carbide contents of other steels in a different article? Is it ok to assume zero carbides and figure TCC from that? using -157 + 15.8*Hardness (Rc) – 17.8*EdgeAngle(°), a "Basic"(1095 or Hitachi White) steel knife at Rc64 and a 15* edge angle would give a TCC of 587. interesting, better than Bucorp 440C and almost as good as their N690. more surprising, is better than Vanax or Elmax shown above.
keep up the good work
scott
Click to expand...
I'm going to discuss carbon steel a little in Part 2. 7 degrees per side is pretty extreme for white steel but it might be possible.
 
I used White as an example because is supposed to be iron, 1% carbon, and a dab of Mn. I have made blades like this with O1 and 1.2519 and they work well as kitchen knives for fruit, veg, and boneless protein. The only drawback is that the steel corrodes faster than stain resistant.
Looking forward to Part 2.
scott
 
Larrin said:
I'm going to discuss carbon steel a little in Part 2. 7 degrees per side is pretty extreme for white steel but it might be possible.
Click to expand...

I’ve gone 9dps with W2, Aeb-l, and z-wear. Cutting performance with fine edges like this is pretty impressive.
 
Thanks for doing this Larrin! Another fantastic article!!

DeadboxHero said:
This is the best article yet.

Larrin is a genius. There is a formula in the article that you can use to see how much a steel will cut with a given hardness and edge geometry.

For example, Vanax Superclean

-157+15.8(60HRC)-17.8(30°inclusive)+20.9(13% Vanadium Nitrides) = 528 Total Cards Cut

Vs Elmax at 543 Total card cut with 60 HRC and 30° inclusive with 16% CrVc and 2% very hard vanadium rich MC type carbide.

Seriously, this article is a HUGE break through.
Click to expand...

Thanks for the examples... trying to figure this out. Where did you get the 13% vanadium nitride number from? The only number I see in the chart is for Vanax 35 which has an MN of 9.

Trying to figure out how I would do the forumula for cruwear, m390, etc.
 
The Uddeholm Spec sheet for Vanax Super clean is unique, it shows the estimated percentage.
Mucho respect to Larrin for accumulating all the carbide percentages.
I'm excited to see more in part 2.

Just plug the numbers into the formula Josh, it looks more complex then it is.
:D


Ju4PdM7.png
 
Here's the chart from the article, Post up some for us Josh :D


RqQvy3C.png



razor-edge-knives said:
Thanks for doing this Larrin! Another fantastic article!!



Thanks for the examples... trying to figure this out. Where did you get the 13% vanadium nitride number from? The only number I see in the chart is for Vanax 35 which has an MN of 9.

Trying to figure out how I would do the forumula for cruwear, m390, etc.
Click to expand...
 
Which Steel Has The Best Edge Retention
Being this is in the knife maker's forum I would have to answer :
Which ever steel you are displaying in your latest advertisement. :D
 
Maybe I just missed it but my take home is that there is no element that the carbon prefers. So if you want a stainless you have to toss in extra Cr because the carbon is not just going to seek out the vanadium in the mix. It will grab what's there and you will end up with Cr carbides vanadium carbides as well as mixed carbide and that could include any other carbide formers along with any mixes of the ingredients. Is this right?
 
skillgannon said:
Maybe I just missed it but my take home is that there is no element that the carbon prefers. So if you want a stainless you have to toss in extra Cr because the carbon is not just going to seek out the vanadium in the mix. It will grab what's there and you will end up with Cr carbides vanadium carbides as well as mixed carbide and that could include any other carbide formers along with any mixes of the ingredients. Is this right?
Click to expand...
I wasn’t writing specifically about that, but yes you can’t just look at a composition and guess what carbides are going to form. Different elements are “stronger” carbide formers than others, and the elements can interact in unexpected ways.
 
DeadboxHero said:
Here's the chart from the article, Post up some for us Josh :D


RqQvy3C.png
Click to expand...

Wish I could man but I still don't understand how you got the 13 number for the vanadium nitrides... the highlighted section you posted on the data sheet just says it's 13% hard phase particles at 60rc. Thanks for trying to explain though o_O:)
 
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