Touhest stainless knife steel

Elmax is the toughest PM stainless steel.

AEB-L/Z-FniNit should be the toughest cast stainless steel at >59 hrc.
 
pubert said:
Just curious, are there advantages of PM steel vs cast?
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PM is the technology to get higher concentrations of alloying elements to steel by making it into powder form before casting it together and forging to stock.
So the powdered steels will be very fine grain and having precisely controlled composition.

But keep in mind, powdered metallurgy will benefit for only higher alloying steel... Simple alloy like most carbon steel or stainless with low amount of carbide forming alloy will has vert few benefit for it since it already fine grain and well alloy distributed it self.
 
pubert said:
Just curious, are there advantages of PM steel vs cast?
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They are completely different. Casting uses no pressure to create the part. IT is just poured into a mold. PM uses heat and high pressure to fuse the powder into a steel. Much stronger part. Theoretically.
 
ThePeacent said:
Indeed!
H1 is really tough,

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won't chip on you, it might bend or fold but is springy and soft, and not stainless, it's stainproof!

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440A is also very soft, very stainless and very easy to sharpen

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My two votes for toughest stainless, no doubt!

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Excellent knife photography there. Kudos to you.
 
12C27M (0.52%C) is a good candidate for use in large tough chopper. Maybe 58rc ht with ~0.45%C in aust solution (yeah slightly under harden) and tempered around 400F.
 
bluntcut said:
12C27M (0.52%C) is a good candidate for use in large tough chopper. Maybe 58rc ht with ~0.45%C in aust solution (yeah slightly under harden) and tempered around 400F.
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Thanks bluntcut !
Not many people make big tough heavy choppers from stainless steel but I believe that it can be done with the right HT.
 
I would go with CPM S35VN. I've used it in a large chopper and it does very well.
Scott
 
The most common knife steel with the most toughness potential is 420J2. Condor used it on their machetes, maybe still does, but I haven't looked.
 
Cobalt said:
Scott, that is anecdotal evidence so it does not count. :D
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Here's a video using a Tusker Bowie in CPM S35VN.
Scott

[video=youtube;_Rni2npVwnE]http://www.youtube.com/watch?v=_Rni2npVwnE[/video]
 
Gaston444 said:
Sadly, most scientists like neat quantifiable concepts that are easily tripped by various unseen, but real, factors, and the success of theories in various applied fields does not mean they don't have huge blind spots elsewhere...

Gaston
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Most scientists I know are very cautious about extending lab results with relatively easy to understand quantitative metrics and field testing where more qualitative measurement is needed. In medicine the latter is often done with doubleblind clinical trials and in health and human services throuhg multi year studies. Field work typically relies on expert classification of observed cases typically called coding. Very hard to get consistent coding.

Cobalt is heading in the right direction with his thinking...

Cobalt said:
Another problem with C-notch is that knives are not designed like blocks of steel. They thin out and the crystal structure in a HT'd knife will behave differently in a knife shape than a rectangular block. S30V may well perform as stated in square block shape and it may be a total failure when thinned out. Just saying this is a possibility as well.

This is not representative of a thin edged knife.
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More deeply, toughness may present differently in different usage contexts (e.g. Big copper vs paper thin chef knife vs hard use construction).

If we want to correlate Charpy tests or even modified tests to field use, we would need "clinical trials" to establish with statistical confidence that steels with good Charpy numbers translate into tough knives.

Charpy tests identify steel that does good on the test, just as Carta testing identifies knives that cut Carta gel well.
 
Charts and graphs are meaningless IMO. It's a starting point. Getting out and using a blade is the best testing. Every company and maker will put their spin on the heat treatment. Some may f..k it up and some will get it right. That goes for any steel.
Scott
 
Gossman Knives said:
Here's a video using a Tusker Bowie in CPM S35VN.
Scott

[video=youtube;_Rni2npVwnE]http://www.youtube.com/watch?v=_Rni2npVwnE[/video]
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Good video. Have you tried any other Stainless steels? What was the Rc of the S35?

S35vn seems to be a pretty good steel so far.
 
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