 Not very helpful maybe but . . .
I sharpen the wood cutting bandsaw blades at the mill where I work. The two types that I sharpen are 8" and 11" wide. They are both 15N20. Very good steel for knives and Damascus as I'm sure you know. I would dare say that the narrower blades that you have are probably bimetal. But then again as far as I can see in the pics, the rust is the same on the teeth as it is on the body of the blade. I could certainly be wrong here- and someone who knows better please correct me if I am- but the rust patterns on the body looks the same as on the teeth. So, maybe it is the same metal?
My reasoning is that I have an old axe head that is iron with a steel bit. You can see that the bit is rusted differently than the rest of the head.
Just my thougts on the subject. |