Cpm m4 vs bohler s690

[Rsq]

Are these the same? Does bohler assemble them the same as crucible? Does one producer make a better version than the other?

 

[knarfeng]

S690
Thought you had a typo at first.
Here's the data sheet for it:

http://www.busmi.com/files/data_sheet_s_690de.pdf

Here's the data sheet for M4
http://www.crucible.com/PDFs/\DataSheets2010\dsM4v1 2010.pdf

The compositions are similar, but not an exact match.

Bottom line:
Don't know. Never tried it.

 

[neuron]

Under the "standards" section, Bohler's data sheet lists S690 as being approximately equivalent to AISI (American Iron and Steel Institute) M4, although like knarfeng said the composition isn't a perfect match either to that or to CPM-M4. But given that the compositions are very similar and that both CPM-M4 and S690 are powder steels (albeit produced using different companies' powder metallurgy technologies), I'd expect their performance to be similar to the point that they'd be indistinguishable in performance assuming comparable heat treat, blade geometry, etc.

 

[Gator97]

Actually Bohler makes 3 of them, S690, S692, and S693, using their "MicroClean" tech, which is some form of PM. S692 has higher than standard spec carbon, but can't find the exact composition. Dunno what's special about 693.