Can you tell us a little more about it? What steel's were used. I do a lot of grinding post heat treat and I haven't had that particular problem. The blade thickness is over 1/8" so if it was tempered at 400 degrees I wouldn't think there would be much flexibility.Has anyone used this san mai? The outer layers are mild steel I think. I followed the heat treat temps and the edge seems hard but I can bend the blade by hand. I did grind post heat treat. Maybe that's the issue.
I'm unable to answer that. For me giving a product guarantee is good but not good enough. My expectation is not to have any come backs and I will do anything I can to make that happen. Including pitching $$ of steel in the trash. I did a short vid for a blacksmith guild of me bending the knife over my knee. I gave remaining 7 inches of the knife about a 1.5 inch curve.So what gives?