Loss reduction in oriented iron-base alloys containing sulfur

Details Loss reduction in oriented iron-base alloys containing sulfur Loss reduction in oriented iron-base alloys containing sulfur

1979-12-04

1981-05-26

Rutledge, L. Dewayne

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148113, 148 315, H01F 100

Patent

active

042696348

ABSTRACT:
This is a method for making a low alloy iron having desirable magnetic characteristics suitable for electrical applications such as transformer cores. The ingot alloy has a relatively high (more than 50 ppm) sulfur and relatively high manganese (0.01-0.15%) and thus can be prepared from commercially available materials without further purification. While the sulfur in such a manganese containing alloy is not removed during final annealing (due to generally less than about 950.degree. C. final annealing temperatures of the primary recrystallization process) the use of a tensile stress (at least 200 psi) inducing glass coating provides for very low losses. The material contains significant amounts of both sulfur and manganese. Both the sulfur and manganese contribute towards the meltability of the alloy and the manganese contributes towards the workability (especially for cool rolling) of the sulfur containing material. Thus the material containing manganese and sulfur, has the high permeability of a low silicon primarily recrystallized material, but does not have the high losses normally associated with a relatively high sulfur containing magnetic material.

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