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Hap40 is a great steel and takes a very keen edge easily for hits hardness. Unlike some of the bigger carbide steels like S110V or Maxamet which can give you fits. I have the Hap40 Delica and Stretch with FRN handles and the steel is one of my favorites as are the models with the stretch being my favorite due to its longer blade but feeling like a smaller knife. You made a great choice and I think you will really like the knife and steel. The SUS410 steel that clads the Hap40 does indeed scratch easily but it is a knife, who really cares.Just ordered a delica in that triple layer hap40 steel stuff. Supposed to be hitachi hap40 (similar to Rex 45) steel in the middle and sandwiched in stainless steel on the outside. Sounds promising but we'll see. Only complaint is people say blade gets scratches cuz outside layers are softer. But that is by design and I think these people may not use their knives if they are worried about scratches ha ha.
I don't know that much about knives but from way too much research yesterday I narrowed it down to benchmade bailout tanto partially serrated aluminum (CPM-M4 steel), spyderco para 3 partially serrated (s30V steel) , or spyderco delica (various steels). I did a deep dive into what steels are used, hardness, toughness etc. I really like the para 3 in maxamet but cost is high. Always wanted a laminate knife after looking into how Japanese used layers to make swords.
Some edge retention testing data below (TCC=Edge retention) from knifenerds website. Para3 or maybe delica (can't remember) is also available in s110v, k390, and s45VN.
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Hap40 laminate one:
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Photos from internet:
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