I was wondering the same thing? I thought 4130 topped out at about 50 RC? prolly a nice tough knife but edge holding?4130 for a knife blade huh? Interesting. I didn’t think the popular alloys for firarms could reach adequate hardness for an proper edge. Looking forward to seeing the outcome.
Ah yes I remember now. I bet it’s going to work out ok. They may just end up being really easy to sharpen.Kevin , I bought a coil spring at a yard sale because the deal was to good , spring is 3.5' x 12'' x 1.5'' thick . had a small chunk tested and turned out to be 4130.