D2 vs. M2 vs. A2

So, let me ask another question then...

Is S30V much more corrosion resistant than 154CM?
 
Note that q-fog testing that Spyderco has done shows the exact opposite behavior as described by the Crucible corrosion chart regarding 440C/S30V.

-Cliff
 
Corrosion resistance is very dependent on the surface preparation. The electropotential measurements are very reproduceable and very reliable from a chemical point of view, but not necessarily a good representation of a real life situation since the surface preparation doesn't play much of a role. My guess here is that the S30V surface was a lot rougher than the the 440C surface in the q-fog test. Just looking at the finish of most S30V blades supports that assumption. It seem to be quite difficult to get S30V to finish really nice and shiny, in a factory process at least (it also seems that there are some custom makers that can do that), while 440C seem to finish very easily very nicely.
 
According to Crucible, 154CM is only marginally better than 440C in toughness, wear resistance and corrosion. The question is, how much easier to sharpen is 440C over 154CM?

I understand what everyone is saying...that numbers don't always tell the 'real life' story.
 
With a good tool like the Sharpmaker, they are both very unproblematic to sharpen. Even S30V is for that matter. Just my $0.02 of course. Personally, I like to stay away from low carbon, high chromium steel (like 420 HC and the like), sharpening wise, they tend to be "gummy" for my liking.

As a P.S.: I was wrong about the chromium content of A2 vs. 52100. A2 has quite a bit more chromium (5% vs. 1.5%) but still very little to D2 (11-13%)which is considered a semi-stainless steel. Definition of stainless, btw. is purely technical a chromium content of 13% or higher.
 
@mathman,

why didn´t you start this topic with the simple question:

I want a knife from benchmade but don´t know which. I have no preference about steel, style and function. Which one would you recommend?

That would fit right here.
 
why didn´t you start this topic with the simple question:

I want a knife from benchmade but don´t know which. I have no preference about steel, style and function. Which one would you recommend?
Click to expand...

Because I wanted to know more about the properties of M2 steel as it compares to other nonstainless.

I am a newbie to knives, steel, etc...often I have many questions and it is difficult to ask everything at once...so I often go off on tangents (math joke) :D .
 
Yep, i see. Are your questions around M2 answered or is anything left?

Considering M2 i found i topic at www.schmiedecafe.com

where hpkb talked about his nailtest. At least he tested a blade made from a sawblade out of HSS Steel (don´t know if it was M2 or any other high speed and i don´t know anything aqbout its hardness or anything else).

He tried to cut a nail by hammering the blade through. After some light hammering (it was the 15th try) the blade cracked. He concluded: Even though HSS showed much strength, for the edge angle was relatively low, the whole blade couldn´t withstand the impacts over time.

When i get the time i will lead BM to this topic asking, what they think about it. Maybe their blades could withstand.

For more detailed information about S30V, i guess the ongoing topics here are a good source. There has been much talked about S30V in special and in comparision.

If there are questions for you out of the actual discussions, you surely will be better to ask it in a single topic. I guess ppl. will like to help you further in a seperate topic rather than in some of the neverending S30V topics. :rolleyes: Leave them for the metallurgists. :rolleyes:
 
I think all of my questions about M2 have been answered. I liked the idea of getting the BM 710 in M2, but went with the 154CM instead because I know that I'll forget to take care of it at some point and the M2 would rust. Although, if I like the 710 in 154CM, I may just have to buy another in M2.
 
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