Cheap stainless? Geometry is often a huge factor. Some guys like Razorback make knives out of D2 with edges so thick that of course they are durable, but in general, D2 is a high carbide steel and actually more brittle than many stainless like 12C27M
Cliff, first of all would like to say, I appreciate your writing. No, I did not chip cheap stainless blades. Nearly all were customs, including 1 made out of forged 440V by a retired maker, I would rather keep his name quiet.
Have never even heard of 12C27M in many years of collecting customs. Guess you have tested the steel? Have to disagree with you in D2 being brittle.
Jimmy Lile was one of the first to use D2 and he used it for all his knives, including camp/bowie knives. Remember him saying he heat treats to 58-60(cant be sure) and they are far from brittle. Have used one of his camp knives(no dot) for more than 20 years without any problems.
My other favourite D2 is a rounded point Aikuchi made by Phill Hartsfield in the early eighties before he switched to A2. Its 10 inch blade is 3/16 thick and is ground to a zero edge, its far from a thick edge. Its edge is 60-61 and is one of the best "bamboo cutters" I own. The owner before me used to test it on elk and moose bone.
Cliff, you certainly test a wide variety of steels and you are probably more scientific in your testing, I certainly respect that. I base my steel choice on my limited experience, thats all. Think we can agree to disagree.
On S7, Im just saying out in the "FIELD" I cant readily tell the difference in its toughness between it and other steels. I dont conduct scientific, controlled tests like you but Im not doubting that S7 is a tougher steel than others.