New High-Toughness Stainless Steel: Nitro-X7

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Chronovore

Chronovore

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So it looks like we've got another new steel on the horizon.

Based on Nitro-V, this new stainless steel "features high working hardness of up to 64 HRC... excellent stainlessness, super fine carbides and... amazing lateral edge stability!"

Relative to MagnaCut, it should offer higher toughness but less edge retention. The corrosion resistance should be at least as good as 14C28N, if not better.

The given composition:

C: 0.7%
N: 0.15%
Cr: 15%
Mo: 0.5%
Si: 0.45%
Mn: 0.4%
V: 0.14%
 
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A little more from KKnives_Switzerland

If you like Nitro-V, you will love Nitro-X7.
I like to refer to X7 as "Nitro-V on steroids". It features high working hardness of up to 64 HRC (potentially 65 HRC!), excellent stainlessness, super fine carbides and, very important to me, an amazing lateral edge stability! This is one for the edge and sharpness enthusiasts.
But not only that:
I have chopped on steel with a 63 HRC Nitro-X7 blade with minimal to no damage, twisted the edge in NF-metals and it performed so well that I can't wait to show it to you guys in detail on future videos.
"When you experience Nitro-X7, it definitely is "more than its parts"
 
Buderus added 0.2% carbon to their Nitro-B to make Nitro X-7. Nitro-B is a 0.15% nitrogen addition to 1.4116, also called X50CrMoV15. It can be tough to keep up with the blistering pace of steel innovation sometimes.

The extra carbon would mean somewhat higher hardness and wear resistance at the cost of some toughness and corrosion resistance. It's not in the same product category as MagnaCut (level of wear resistance) so I wouldn't call one a replacement for the other.

Nitro X7 composition.png
 
You guys are fast, glad to see this talked about here.

When I first saw the composition of Nitro-X7, I had to remind myself of what I've been preaching for years: that it is very important to judge steels not on composition alone when it comes to knife applications, reason being that lateral edge stability is so important. This is where I found Nitro-X7 to excel. Gross toughness is also great, but the edge it takes and how it maintains is just a chefs kiss.

Given how well loved Nitro-V and AEB-L have become over the years, I think that people will really dig Nitro-X7.



And as a side note, like Larrin said: Magnacut and Nitro-X7 are NOT replacements for each other. They don't try to be and can't be. I for my part am glad to see more and more knife focused steels and also alternative edge materials come to the market.
 
Kryme said:
Wouldn't call anything with less than 1% carbon steel let alone "super".
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This. To be a "super steel" for my usages, carbides are required. This does not have enough carbon to form significant amounts of carbide. This may have high hardness and pretty fair toughness, but the wear resistance will be missing.

It may be an improvement on Nitro V. Not anywhere close to S30V or Magnacut.
 
Kryme said:
Stainless... low edge retention... so basically Magnacut from temu🥱😴 . Wouldn't call anything with less than 1% carbon steel let alone "super".
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Steels have different properties that make them good for different purposes. MagnaCut is special in that it selectively forms vanadium carbides while leaving a lot of chromium free for corrosion resistance. It has an awesome balance of toughness and edge retention while nearly maxing out corrosion resistance. However, MagnaCut is notably not as tough as AEB-L, Nitro-V, or 14C28N. It also doesn't have the edge retention of S90V, S110V, or even S30V with a good heat treatment.

The point here was extreme toughness. Getting even higher toughness than AEB-L, Nitro-V, or 14C28N and being able to run it at higher hardness should be impressive. Being at least as stainless as 14C28N is icing on the cake.

Since it looks like my link to the initial announcement on Instagram was removed anyway, here is a screenshot of the micrograph.

bVZh9Ty.jpeg
 
Chronovore said:
The point here was extreme toughness. Getting even higher toughness than AEB-L, Nitro-V, or 14C28N and being able to run it at higher hardness should be impressive. Being at least as stainless as 14C28N is icing on the cake.
Click to expand...
Those are bold claims and make no sense based on the composition. How does increasing chromium from 13 to 15% give you even higher toughness? There’s no way Buderus would claim that. They certainly haven’t provided us any comparative numbers showing it.
 
knarfeng said:
To be a "super steel"
Click to expand...

Unless we all agree what makes a "super steel" by definition I don't know what to think.

Like all the "tactical" items out there. Because it's black, has pic rails, and no wood? I remember years ago asking what someone meant when they said tactical gloves only to find out he meant black Mechanix gloves.

To be a super steel does it have to just not be common ingot steel? So spray form or powder? Does than mean 154CM isn't but CPM-154 is? Is LC200N considered a super steel? That's pretty low carbon but good luck trying to make it rust but it still makes a decent blade.

This is a bit of a derailing but couldn't get the thoughts to stay in my head.
 
Looking good :)
This isn't a super steel, but a very promising in its league.
Sharp edge and more are expected.

I'm no expert - first comment 😉.
 
Chronovore said:
Steels have different properties that make them good for different purposes. MagnaCut is special in that it selectively forms vanadium carbides while leaving a lot of chromium free for corrosion resistance. It has an awesome balance of toughness and edge retention while nearly maxing out corrosion resistance. However, MagnaCut is notably not as tough as AEB-L, Nitro-V, or 14C28N. It also doesn't have the edge retention of S90V, S110V, or even S30V with a good heat treatment.

The point here was extreme toughness. Getting even higher toughness than AEB-L, Nitro-V, or 14C28N and being able to run it at higher hardness should be impressive. Being at least as stainless as 14C28N is icing on the cake.
Click to expand...

I get that, it's just providing a solution nobody asked for to a problem that nobody has.
 
if they wanted a super tough steel, they'd be better served using 3v ; )

honestly, there is no way this x7 will come close to the toughness or 3v, or even aeb-l
...
however it should still be interesting to actually see real tests and results
 
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