So I was talking to my Dad about my new Dogfatherthe other day, and he being an engineer with a broad knowlage of materials and things, he was in amazingment about the steel that our mighty Scrapyard goods are made of. so after I got off the phone talking to him I sat down and Googled away. I found that SR-77 is about the coolest toughest stuff you can put an edge on. My searching took me in to tooling, die makers, machinist, and mechanics chat sites and forums the constant theme was the toughness and shock and impact resistance of S-7.
http://www.crucibleservice.com/datash/dsS7v6.pdf?CFID=1126922&CFTOKEN=65554049http://www.pvsteel.com/docs/Tsb-093.pdfhttp://www.angelsword.com/steel_toughness.phpSo take these facts and add Dan's magic baking secret(the heat treat process) and you have one heck of an knife.