Patent ID: 8404061
Filing Date: 2013-03-26
Classification: C21D,Y10T

Abstract:
1. A method for producing components from an air-hardenable steel comprising the following elements (composition in mass-%): C≦0.20 Al≦0.08 Si≦1.00 Mn 1.20 to ≦2.50 P≦0.020 S≦0.015 N≦0.0150 Cr 0.30 to ≦1.5 Mo 0.10 to ≦0.80 Ti 0.010 to ≦0.050 V 0.03 to ≦0.20 B 0.0015 to ≦0.0060 remainder iron, including typical elements in steel production, the method comprising the steps of: heating a hot-rolled or cold-rolled steel sheet blank or steel tube blank to a temperature of θ transferring the hot steel blank to a forming tool, closing the forming tool, forming the hot-rolled or cold-rolled steel sheet blank or steel tube blank into a component in the closed forming tool for a duration of less than 5 sec, while simultaneously heating the forming tool to attain a cooling rate of the blank of at most 150 K/s, removing the formed component from the forming tool while the component has a temperature between 200° C. and 800° C., and cooling the formed component down in air after removal from the forming tool at a cooling rate less than the cooling rate in the forming tool, thereby hardening the component during cooldown in air to attain a minimum elongation of no less that 13% and a tensile strength between 800 MPa and 1200 MPa.