Steels made from powdered elements, why?

Larrin said:
That chart doesn't take in to account ease of sharpening. It is very difficult to sharpen. Also, wear resistance doesn't always = edge retention. 3V is a much more balanced steel.
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I see only one steel which was hard to sharpen - CPM S90V, because it has Vanadiun Crbides which are harder then ceramic (Aluminium Oxides) so I have to swithch to Silicon Carbides and Diamond sharpening. Otherwise itis more difficult to sharpen soft steel because of the burr.

There is conspiracy theory that manufacturers once experienced CPM 440V (S60) which wear out their equipment very fast now switch to CPM S30V (instead of CPM S90V which suppose to get 440V place according to graph) simple because it is too hard to manufacture usinfg existed equipment.

This is why MIM looks attractive - wear resistance of the steel not an issue for manufacturer anymore.

Thanks, Vassili.
 
nozh2002 said:
I see only one steel which was hard to sharpen - CPM S90V, because it has Vanadiun Crbides which are harder then ceramic (Aluminium Oxides) so I have to swithch to Silicon Carbides and Diamond sharpening. Otherwise itis more difficult to sharpen soft steel because of the burr.

There is conspiracy theory that manufacturers once experienced CPM 440V (S60) which wear out their equipment very fast now switch to CPM S30V (instead of CPM S90V which suppose to get 440V place according to graph) simple because it is too hard to manufacture usinfg existed equipment.

This is why MIM looks attractive - wear resistance of the steel not an issue for manufacturer anymore.

Thanks, Vassili.
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9V has just as much vanadium as S90V.
 
CPM is NOT powdered metalluty........it is CRUCIBLE PARTICLE METALLURGY.

First they make particles with the desired formulation, then they put them in a crucible and make the sheets.

The Crucible Site explains it pretty clearly.
 
tom mayo said:
CPM is NOT powdered metalluty........it is CRUCIBLE PARTICLE METALLURGY.

First they make particles with the desired formulation, then they put them in a crucible and make the sheets.

The Crucible Site explains it pretty clearly.
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Tom, have you heard anything about CPM being hard to get a really bright polish on because of the fine grain structure?
 
DGG said:
Tom, have you heard anything about CPM being hard to get a really bright polish on because of the fine grain structure?
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That would be because of vanadium, not because of fine grain structure. That's what CPM-154 is going to be for.
 
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