Patent ID: 9234253
Filing Date: 2016-01-12
CPC Classification: B21D,C21D,C22C

Claim Text:
1. A method for producing a readily formable flat steel product that has an inner core layer and a ductile edge layer at a free surface of the flat steel product, wherein the ductile edge layer covers the inner core layer, wherein the ductile edge layer is from 10 to 200 μm thick, and wherein a ductility of the ductile edge layer is greater than a ductility of the inner core layer, the method comprising the steps of: annealing a flat steel product having a C content of from 0.1 to 0.4% by weight in a continuous furnace, wherein the step of annealing is carried out under an annealing atmosphere that contains from 0.1 to 25% by vol. of a total amount of H in the course of the annealing, heating the flat steel product to a holding temperature of from 600 to 1100° C. and for a holding time of from 10 to 360 seconds.