440c and n690 co the same steel?
KarlMaldensNose said: Click to expand...
I've not heard of this happening, and I'd be interested to read about how it happened and what was being cut at the time. Do you have a link to a review that discusses this?
N690Co contains Cobalt to retard crack propagation, thus the "Co" at the end. It's good steel, made by Boehler in Austria, and I'm a little surprised to hear about the failures people have experienced. That said, high alloy steels are fairly demanding in their heat treating process so it's possible someone screwed that up on a batch of blades. True, stainless steels are not as tough as many non-stainless steels, but then too they don't lose their edge due to rust as can easily happen with tool steels kept in a wet sheath or used to cut corrosive materials.
To their credit, there are a great many stainless steel blades being used everyday by military personnel in hostile environments and challenging applications and those users are less than tolerant of equipment failure, particularly those in special operations. In fact Spartan Blades which is owned and run by a couple ex-Special Forces guys use S30V in all their blades and supply a great many of them to Special Forces personnel at Ft Bragg. Strider also uses S30V and many of their knives are used in combat operations. Chris Reeves Special Forces knives are S30V as well, so stainless is not synonymous with failure. Poor design and poor heat treating certainly are.
All the Spyderco knives I designed use a heavy convex edge made expressly for chopping. The edge is thick at the top of the convex, ~0.040-0,050", and would take considerable lateral force on a hard object (not wood) to chip or crack, but there's no doubt a person who wants to break a knife, any knife, can do so. Personally, I've not heard of one of the Spyderco knives failing.
I've not heard of this happening, and I'd be interested to read about how it happened and what was being cut at the time. Do you have a link to a review that discusses this?N690Co contains Cobalt to retard crack propagation, thus the "Co" at the end. It's good steel, made by Boehler in Austria, and I'm a little surprised to hear about the failures people have experienced. That said, high alloy steels are fairly demanding in their heat treating process so it's possible someone screwed that up on a batch of blades. True, stainless steels are not as tough as many non-stainless steels, but then too they don't lose their edge due to rust as can easily happen with tool steels kept in a wet sheath or used to cut corrosive materials.To their credit, there are a great many stainless steel blades being used everyday by military personnel in hostile environments and challenging applications and those users are less than tolerant of equipment failure, particularly those in special operations. In fact Spartan Blades which is owned and run by a couple ex-Special Forces guys use S30V in all their blades and supply a great many of them to Special Forces personnel at Ft Bragg. Strider also uses S30V and many of their knives are used in combat operations. Chris Reeves Special Forces knives are S30V as well, so stainless is not synonymous with failure. Poor design and poor heat treating certainly are.All the Spyderco knives I designed use a heavy convex edge made expressly for chopping. The edge is thick at the top of the convex, ~0.040-0,050", and would take considerable lateral force on a hard object (not wood) to chip or crack, but there's no doubt a person who wants to break a knife, any knife, can do so. Personally, I've not heard of one of the Spyderco knives failing.
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