Barry from what I researched on the web T420 has a HRc =50. This indicates it’s a softer stainless steel. HRc 58-60 is where they are considered hard. Based on it’s hardness the Rada knife should be relatively easy to sharpen and not too durable to hold this edge. You didn’t indicate a shape or style to the knife. If the manufacturer’s recommendation is 33 degrees; inclusive ?, or 16.5º degrees per side? I would have to think this is a bit too narrow or acute for steel of this hardness, (i.e., relatively moderate hardness).
I would look to sharpen it at 18-20º per side. I would start at 200 or 400 grit diamond stones. I would think that you could easily take it through 1000 grit and follow up with leather strops at 2º less angle then the sharpened angle. I would expect it should sharpen up relatively easy and get pretty sharp. I think it will be easy to sharpen and easy to wear dull.
Barry, if you could provide a little more info it would be helpful:
- knife type or style and length?
- your model WEPS?
- are your stones new or broken in?
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