US 11,702,718 B2
Method of making magnetically soft intermediate product
Dieter Krech, Hagen (DE); and Thomas Kloss, Hamm (DE)
Assigned to BILSTEIN GMBH & CO. KG, Hagen (DE)
Filed by Dieter Krech, Hagen (DE); and Thomas Kloss, Hamm (DE)
Filed on Mar. 8, 2021, as Appl. No. 17/195,008.
Prior Publication US 2022/0282354 A1, Sep. 8, 2022
Int. Cl. C21D 9/52 (2006.01); C21D 8/02 (2006.01); H01F 1/147 (2006.01)
CPC C21D 9/52 (2013.01) [C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); H01F 1/147 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method of making a soft, metallic, and magnetic intermediate product, the method comprising the steps of:
manufacturing or providing a metallic, rollable blank,
prerolling the metallic blank with a defined degree of deformation to an intermediate thickness, the defined degree of deformation being matched to a critical or postcritical degree of rolling to be maintained during subsequent rolling,
heat treating the prerolled blank,
rolling the heat-treated blank with a critical or postcritical degree of rolling to a final thickness,
thereafter annealing the rolled blank to set a defined grain size therein, and
finishing the the annealed blank.