There is only one version of S30V, and there are two types of 154. CPM154 is the same powder metallurgy type as S30V, where 154CM is molded into billets. While there are some that could tell the difference, the main one is in how CPM154 takes and holds an edge longer due to its finer grain. Hope this makes sense.
ok, so in 154 there is a diffidence as you say.
(or as i thought there is in all of them)
but why some blades marked/stamped CPM next to S30v & some don't
if there's no diffidence, and are they mark CPM as reference to the
S30v manufacture (CPM) & not the CPM processes which is the particle metallurgy itself ?
