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Effect of Hot Band Annealing on Microstructure of Semi-Processed Non-Oriented Low Carbon Electrical Steels

Published online by Cambridge University Press:  01 February 2011

Emmanuel J. Gutiérrez ,
Castañeda  and
Armando Salinas Rodriguez
Emmanuel J. Gutiérrez
Affiliation:
Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Saltillo Coahuila, P.O Box 663, México 25900.
Castañeda
Affiliation:
Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Saltillo Coahuila, P.O Box 663, México 25900.
Armando Salinas Rodriguez
Affiliation:
Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Saltillo Coahuila, P.O Box 663, México 25900.
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Abstract

Effects of hot band annealing on the final microstructure and magnetic properties of cold rolled and annealed non-oriented grain Si-Al electrical steel strips are investigated. Microstructures are characterized using optical and scanning electron microscopy and magnetic properties are determined using a vibrating sample magnetometer. It is shown that annealing of hot rolled bands at temperatures between 800 and 850 °C causes rapid decarburization and development of a microstructure consisting of large columnar ferrite grains free of secondary particles. This microstructure leads, after cold rolling and a fast annealing treatment, to large grain microstructures similar to those observed in production scale, fully processed strips. It is observed that the final grain size increases with the final annealing temperature, leading to a significant improvement of the magnetic properties. Therefore, hot band annealing technology can be an attractive alternative processing route for the manufacture of non-oriented grain low carbon Si-Al processed electrical steel strips.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1243: Symposium 5 – Advanced Structural Materials , 2009 , 16
Copyright
Copyright © Materials Research Society 2010

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References

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