I want to make a hinge fuller out of old truck leaf spring. I figure I can cut them with a torch and grind the ends clean, and heat them in a forge and hammer them flat, and then do the shaping on a mill and belt sander. There will be 2 pieces both layed on their long edge, edge up. One will be welded down and the other will be hinged such that when it is in the fully down position it lays edgewise right on top of the other one. The top of the hinged piece will be hit with a hammer. I want to know the best way to heat treat the top surface that will be struck with a hammer. My goal is to have it tough enough so it doesn't mushroom right out under hammer blows, but not hard enough to chip.
I'm a total rookie at heat treating.
Anyone want to take a stab at this?
Grant Erwin Kirkland, Washington