S90 or M398 SanMai

navman said:
Niagra Specialty Metals did a run of S90V san mai with Cpm 154 cladding.
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Why? Seems better to just make a CPM 154 monosteel blade, or just S90V if you really need the edge retention. It's not like it has terrible corrosion resistance.
 
Because...why not? I ordered a bar of CPM-154/10V san mai several years ago (to date have made 1 blade, saving the rest for special projects.) Aside from the corrosion resistance, which I agree is not a huge concern with S90V, supposedly it provides increased toughness and the ability to obtain a mirror finish that is difficult to obtain with the higher wear resistant steels. Also, as Lorien said, when etched it looks cool!
 
Issue I'm having is the high temp. Is there any downsides of using "normal" SS at 1170°C (2140°F)?
 
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I've made two bars of CPM 154/10V/154 san-mai.
The two alloys have a similar forging temperature and heat treat.
I started with bars 4.5x38x150mm and fully seam welded the billets.
I used a Paragon Pro electric furnace and forged them from 1150°C under a 25kg power hammer.
After 5 or 6 heats the bars had only stretched to 180mm.
If you try it I recommend using stock that will be closer to your finished size or using an extremely powerful hammer or press or rolling mill.
 
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