Patent ID: 9080222
Filing Date: 2015-07-14
Classification: C21D,Y02P

Abstract:
1. A method for producing hardened open profiles, comprising: forming recesses in a component, wherein the recesses are in the form of longitudinal or transversal grooves, holes, round holes, triangular or polygonal holes, slots, indentations, or stamped-through portions, and the recesses have free edges; and configuring the shape, size in terms of area, and distribution of the recesses, including distance between the free edges, to control resulting hardness or hardness gradients; heating the component firstly to a temperature below an austenitizing temperature of a basic material of the component using one of conduction, convection, and radiation, and carrying out a subsequent induction heating step to reach the austenitizing temperature along the free edges of the component; after heating, cooling the component at a rate above a critical hardening rate to achieve a hardness gradient over a cross section of the component and over an axial section of the component.