US 12,264,386 B2
FeCoV alloy and method for producing a strip from an FeCoV alloy
Niklas Volbers, Hanau (DE); Michael Müller, Hanau (DE); and Jan Frederik Fohr, Hanau (DE)
Assigned to Vacuumschmelze GmbH & Co. KG, Hanau (DE)
Filed by Vacuumschmelze GmbH & Co. KG, Hanau (DE)
Filed on Oct. 20, 2023, as Appl. No. 18/382,073.
Application 18/382,073 is a division of application No. 17/554,247, filed on Dec. 17, 2021, granted, now 11,827,961.
Claims priority of application No. 102020134294.2 (DE), filed on Dec. 18, 2020.
Prior Publication US 2024/0043972 A1, Feb. 8, 2024
Int. Cl. C22C 38/10 (2006.01); C21D 8/02 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C22C 38/44 (2006.01); C22C 38/50 (2006.01); C23C 16/40 (2006.01)
CPC C22C 38/10 (2013.01) [C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0263 (2013.01); C21D 8/0273 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/12 (2013.01); C22C 38/44 (2013.01); C22C 38/50 (2013.01); C23C 16/403 (2013.01); C23C 16/405 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An FeCoV alloy with a composition consisting essentially of:
30 wt %≤Co≤55 wt %, 0.4 wt %≤V≤1.5 wt %, 0.0 wt %≤Nb≤0.15 wt %, 0.0 wt %≤Ta≤0.30 wt %, 0.0 wt %≤Nb+0.5·Ta≤0.30 wt %, 0.0 wt %≤Si≤0.50 wt %, 0.0 wt %≤A1≤0.50 wt %, max. 0.5 wt % Mn, max. 0.5 wt % Cr, max. 0.5 wt % Ni, max. 0.5 wt % W, max. 0.5 wt % Mo, max. 0.5 wt % Zr, up to 1 wt % of impurity elements, and the rest Fe,
the FeCoV alloy having a phase transition from a ferritic α-phase region to a mixed ferritic/austenitic α+γ-region that takes place at a transition temperature T(α/α+γ), where T(α/α+γ)≥910° C.,
wherein the FeCoV alloy is heat treated in a final annealing process at a temperature Tmax, where Tmax≤T(α/α+γ) and Tmax>905° C.,
a temperature difference ΔT between the transition temperature T(α/α+γ) and the temperature Tmax is no more than 20° C.
after heat treatment the FeCoV alloy has a polarisation J(16 kA/m)≥2.30 T, a maximum permeability μmax>25,000, a coercive field strength Hc≤30 A/m, and/or an electrical resistance of at least 0.15 μΩm.