Hey Earl.....
If you have Cinci era knives, the BK2 is made from 4140 at a 53-55 RC and the Tactul is probably 440A stainless and if it is carbon it is also 4140......4140 has tremendous toughness and is usually not considered a great knife steel but as I found out it DOES hold a pretty good edge, is a fairly aggressive cutter and is pretty easy to sharpen.....Is it 1095 cro-van, D2 or A2 - no, but I got no complaints about the steel at the time.........I used 440 A for the Tactul because I hoped to market it to the dive community as the Divtul and I could only afford so much steel......I specced 440A rather than the more commonly used 440C because of it's better mechanical properties.....BTW one of the great things about 4140 is that you can sharpen the blade with a good file in an emergency......One of the other nice things about 4140 is that it is used in a lot of automotive gears and springs, as well as rifle barrels(it is also known as ordnance steel) and a whole lot of heat treaters can cook it just right badly hung over.....Heat treat is often more important than steel choice.....Knives are made or ruined in heat treat......
f a business.
The short answer is I would rather have 1095 CroVan cooked to Tooj's specs than an original Cincinnati product that was 4140 and cooked over at the heat treat subsidiary of Cincinnati Gear Corp.....Although those guys ALWAYS cooked right to spec.......
All Best....
ethan