Bimetallic blades use a backing that is Only there to give a place to attach teeth made of a better material for the use. It is just a guess as to what that backing may consist of. The blades that Ecart uses woulf be great for knife making and in billets. If you want to forge weld I persoannly would not use the bimetallic blades but would and do use 15N20. I mix it with a simple 10 series steel so I can get a nice contrast in the billet. And as I always say time spent on basice blacksmith skills will pay off a lot if you get into blades later.
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