How about a CPM M4 Endura?

Jeff O said:
Sound like an interesting but different knife. Yesterday I tried to cut through an air hose that, unknown to me, had steel braid inside. The vg10 rolled a little but wasn't as damaged as I thought it would be. How would k390 hold up to that?
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It would have some edge damage but not as likely to chip.
A quick reality check on knife steel, they all get damaged when doing that kind of cutting.
However the carbon tool steels even with high alloy and HRC hold up great.
K390 would not blunt as bad as vg10 and would have less damage.
It's not going to be the ultimate steel for all but it's some good stuff for edge performance minded folk
 
I have great appreciation for high hardness steels but it really sucks when you unexpectedly hit a piece of something hard. I would much rather have an edge roll than chip. To me, that component of toughness is a direct component of edge retention.
 
bearfacedkiller said:
Hitachi XVC11 is the same composition as M4. I would be very interested in this happening.
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This^. Let's try something new. If the scales were red I would prefer an orange-red (remember the adjective comes first). I would rather have a dark navy blue or dark gray-blue.
 
M4 and HAP40 are more or less the same steel, or in the same category of steel - I doubt they would even consider this. On the other hand I'd love to see an Endura in HAP72 @68-69HRC :)
 
A burnt red 52100 endura would be perfect. But they would never make it because of all the dozens of spydercos I own, I might never have to buy another one. Ok, I'd buy at least 3 of those.
 
bearfacedkiller said:
Hitachi XVC11 is the same composition as M4. I would be very interested in this happening.

HAP40 is the same composition as M4 but with the addition of a bunch of cobalt. Cobalt does not form carbides and is supposed to be added to aid in hot hardness, something irrelevant to knife blades. That said, I do find my HAP40 blades to behave differently than my M4 blades. I am not sure why.
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How do they behave differently?
 
I have also noticed that M4 (GB and GB2) has more edge retention in EDC tasks than HAP40 (Endura).
 
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NJBillK said:
How do they behave differently?
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I have a few Spydies in each steel. I have found HAP40 more stain resistant and less wear resistant and I have found M4 less stain resistant and more wear resistant. In my experience HAP40 takes a screaming sharp edge with very little effort. I really, really like the edge I get from it and it's edge retention is great but still a step below M4.

Maybe the difference is just in heat treat? I don't know. For EDC I love HAP40.
 
bearfacedkiller said:
I have a few Spydies in each steel. I have found HAP40 more stain resistant and less wear resistant and I have found M4 less stain resistant and more wear resistant. In my experience HAP40 takes a screaming sharp edge with very little effort. I really, really like the edge I get from it and it's edge retention is great but still a step below M4.

Maybe the difference is just in heat treat? I don't know. For EDC I love HAP40.
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What do you use for edge maintenance on your HAP40? Strop, ceramic, diamonds?

How thin BTE do you run your HAP40 knives?
 
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