Method of continuous annealing low-carbon electrical sheet steel

Details Method of continuous annealing low-carbon electrical sheet steel Method of continuous annealing low-carbon electrical sheet steel

1979-09-17

1982-04-27

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 16, 148 39, 148 3155, H01F 100

Patent

active

043268994

ABSTRACT:
A process for producing a low-carbon electrical sheet steel having a superior and unique duplex microstructure having a mid-section of fine-grained ferrite with dispersed carbide precipitates and a coarse grained surface of ferrite without significant precipitates. The unique microstructure is effected by a duplex continuous anneal wherein the steel is first decarburized annealed at 1350.degree.-1500.degree. F. for a time sufficient to decarburize only the surface, and thereafter heat treated to austenitize the steel, followed by controlled cooling to effect the above-described microstructure.

REFERENCES:
patent: 3188250 (1965-06-01), Hobein et al.
patent: 3196054 (1965-07-01), Carpenter
patent: 3215566 (1965-11-01), Mayer
patent: 3406047 (1968-10-01), Magor et al.
patent: 3865638 (1975-02-01), Ballantyne et al.

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