Production and Properties of Grain-Oriented Commercially Pure Iron

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Abstract
Flat‐rolled commercially pure iron such as Armco magnetic ingot iron has been found useful in applications requiring high‐flux density. The existing commercial iron products do not have a strong texture. The development of a process for grain orientation in commercially pure iron could be expected to substantially improve the magnetic properties, making possible new applications. In order to obtain a strong secondary recrystallization texture of the cube‐on‐edge type it is necessary to restrain grain growth of the primary structure, so that this fine‐grained structure is maintained until secondary growth occurs at higher temperatures. Inhibitors added to the melt have not been effective in inhibiting the strong normal grain growth in commercially pure iron. Effective inhibition of normal grain growth has been accomplished by diffusing extra sulfide inhibitors into the primary grain boundary in a very early stage of the final anneal. This has the effect of inducing a strong secondary growth into a material that will not normally support this type of secondary recrystallization. Magnetic properties of highly oriented flat‐rolled iron are given for sheet thicknesses from 6 to 25 mils. Comparisons of properties are made with 3% silicon iron and 50% cobalt—iron sheet.

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