Is cpm 3v if heat treated right as tough as 5160

ShannonSteelLabs said:
Would you prefer 420J2?

I would love a PM blade steel in s survival situation. CPM 3V is plenty tough for me and should have enough edge holding to get me out of said jam.
PM steels have earned their place. 85-90% of knives I make are made with that process
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Never used that steel.
 
Fredrik Haakonsen, a PhD in metallurgy, makes most of his knives out of A8(mod), and his knives have proven excellent. Here's what he says about why he uses such a tough steel:

A8-mod is a modified version of AISI A8. It’s a conventional cold work tool steel, with a medium carbon content and alloyed with chromium, molybdenum and vanadium. It exceeds most knife steels in toughness. Toughness is a property often overlooked in knife steels, often on behalf of corrosion and wear resistance. The thing is that a sharp edge with a decent edge angle (<35° total angle) needs toughness to avoid breakage of the edge/chipping, especially when working with hard materials like wood. Because of this, edge retention of this steel will be better than higher alloyed steels and even powder steels for many purposes.
Many combat and survival knives are made today in brittle steels like S30V, D2, ATS-34 and 440C. These have very little safety margin and will break without warning when overloaded. A8-mod has, even on a hardness of over 60 HRC, ductility and will bend before fracture. (This doesn’t mean that it is soft.)
All knives can be broken, knives in A8-mod will just give you a much harder time doing so.
A little more on this.
http://xxxknives.blogspot.com/2011/01/a8-mod.html
 
I'd love to use some A8 mod, people used to theorize (incorrectly) infi was a8 mod.

I'm not familiar with any makers that use a8 mod though, so it's lack of availability kinda sucks.
 
hugofeynman said:
No (if well made, of course), but if you accidentally hit a rock and damage the blade, is much harder to repair.
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I guess if I hit a rock while chopping wood, I deserve a hard to repair blade.
 
Twindog said:
Fredrik Haakonsen, a PhD in metallurgy, makes most of his knives out of A8(mod), and his knives have proven excellent. Here's what he says about why he uses such a tough steel:

A8-mod is a modified version of AISI A8. It’s a conventional cold work tool steel, with a medium carbon content and alloyed with chromium, molybdenum and vanadium. It exceeds most knife steels in toughness. Toughness is a property often overlooked in knife steels, often on behalf of corrosion and wear resistance. The thing is that a sharp edge with a decent edge angle (<35° total angle) needs toughness to avoid breakage of the edge/chipping, especially when working with hard materials like wood. Because of this, edge retention of this steel will be better than higher alloyed steels and even powder steels for many purposes.
Many combat and survival knives are made today in brittle steels like S30V, D2, ATS-34 and 440C. These have very little safety margin and will break without warning when overloaded. A8-mod has, even on a hardness of over 60 HRC, ductility and will bend before fracture. (This doesn’t mean that it is soft.)
All knives can be broken, knives in A8-mod will just give you a much harder time doing so.
A little more on this.
http://xxxknives.blogspot.com/2011/01/a8-mod.html
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I was avoiding mentioning names, but Haakonsen runs most of his A8mod blades at 61hrc and his knives are really tough.
Landes uses AEBL for his kitchen knives with ultra thin edges and S1 when he needs more toughness.
 
I don't understand why people don't understand at least the basic framework of powder metallurgy.

Is it like understanding electricity? Something akin to magic/witchcraft? Is it because you can't see it then it can't be real?

https://knifesteelnerds.com/2018/08/20/what-is-powder-metallurgy/

Do the anti's feel that when a knife is forged by the light of a full moon that the soul of the blade will be stronger than anything "Science" could do?
 
Danke42 said:
I don't understand why people don't understand at least the basic framework of powder metallurgy.

Is it like understanding electricity? Something akin to magic/witchcraft? Is it because you can't see it then it can't be real?

https://knifesteelnerds.com/2018/08/20/what-is-powder-metallurgy/

Do the anti's feel that when a knife is forged by the light of a full moon that the soul of the blade will be stronger than anything "Science" could do?
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An excellent article
 
Danke42 said:
I don't understand why people don't understand at least the basic framework of powder metallurgy.

Is it like understanding electricity? Something akin to magic/witchcraft? Is it because you can't see it then it can't be real?

https://knifesteelnerds.com/2018/08/20/what-is-powder-metallurgy/

Do the anti's feel that when a knife is forged by the light of a full moon that the soul of the blade will be stronger than anything "Science" could do?
Click to expand...

What are you referring to?
 
Twindog said:
I'm one of those who think that Infi is based on A8(mod), mostly from what I've read. Can you explain why that's not true?
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Infi's composition has been posted here before and it was indeed different from a8 mods. It's been years since I read it though. Not to mention infi hasn't remained the same throughout the years, it's changed. Perhaps at one time it was similar to A8 mod, I don't know the composition of every incarnation of infi.
 
That's peculiar

http://www.steeldata.info/tempering/demo/data/740.html

I can see some similarities, although the infi composition has no MN at all. The percentages are pretty different as well, I'd imagine enough different to make it another alloy?

I seem to remember infi had nitrogen as well. But I don't care to dig for the next 2 hours.
 
shinyedges said:
That's peculiar

http://www.steeldata.info/tempering/demo/data/740.html

I can see some similarities, although the infi composition has no MN at all. The percentages are pretty different as well, I'd imagine enough different to make it another alloy?

I seem to remember infi had nitrogen as well. But I don't care to dig for the next 2 hours.
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From a quick digging, infi did apparently used to have nitrogen and CO. In any case the changes in infi hardly make it acceptable to call it a8 mod, idk ask Jerry busse :thumbsup:
 
Wasn't it discussed in the past that Infi is more of a for lack of a better word a "brand name" and that the material and process has evolved over the years?
 
Danke42 said:
Wasn't it discussed in the past that Infi is more of a for lack of a better word a "brand name" and that the material and process has evolved over the years?
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Yes, it's composition changed. For all we know it's changed again and is completely different, but it's a8 mod :thumbsup:
 
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