Help recalling a type of blade steel - D3?

[Smiling]

I've got several knives with D2 blade steel and it's one I like despite some of it's drawbacks like a lower rust resistance but recently saw something like D2 but better in a number of ways.
I thought it was called D3 and I saw some knives with that better steel but can't seem to find any now so I question what blade steel it was (memory slip? ). I'm familiar with nearly all common and even less common blade steel types but the one I'm trying to find eludes me.
List of the ones it is NOT:
CPM S30V
CPM S90V
CPM S110V
CPM 154
A2
D2
M390
154CM
ATS-3
CTS-XHP
M2
M4
440 or anything similar or close to that type

It was a blade steel type that I had never heard of before but it was not totally new either - I think I recall it had been around a couple years at least. Any help in recalling this new-to-me blade steel much appreciated. I really thought it was called D3 (and maybe had another name but some were referring to it as D3) but even Google searches for D3 blade steel don't seem to produce any relevant hits.

Maybe 5100 high carbon? I plan to buy a knife in that steel.

 

[farid.]

I have used D3 and D6 for a number of years and still use them both, they are both high performance steels you just need to understand if you are buying a high performance knife for bending or cutting, D3 and D6 can be heat-treated for both applications.
In the recent years I have lowered the RC on the D6 from 62-64 down to around 58-60 and it is much tougher and still cuts like a high performance tool, D3 I have used at the world championship BladeSports two years in the past and never chipped it at 58RC.
Again, we must understand 'Steels', I am still learning after 40 years in engineering, since I was 8.
take care all,
Farid Mehr