Processing and Microstructure of Grain Non-Oriented Electrical Steel Strips with Improved Magnetic Properties

Armando Salinas-Rodríguez; E. Gutiérrez-Castañeda

doi:10.4028/www.scientific.net/MSF.706-709.2800

Paper Titles

Behavior of Pearlite in ThermoMechanical Processing and Service-Historical Perspective
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Microstructure Modelling of Solid-State Transformations in Low-Alloy Steel Production
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Development of Asymmetric Rolling for the Better Control over Structure and Mechanical Properties in IF Steel
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Hot Deformation Behaviour of Low Alloyed Steel
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Processing and Microstructure of Grain Non-Oriented Electrical Steel Strips with Improved Magnetic Properties
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Effect of Magnetic Field Processing on Recrystallization and Grain Growth
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Advanced TMCP Steel Plates for Pipelines and Structurals
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Optimising Thermomechanical Processing with Reduced Energy Demand
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Evaluation of the Behaviour and Properties of a High-Si Steel Processed Using Direct Quenching and Partitioning
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Processing and Microstructure of Grain Non-Oriented Electrical Steel Strips with Improved Magnetic Properties

Abstract:

The effects of annealing prior to cold rolling on the microstructure and magnetic properties of a low-C grain non-oriented (GNO) electrical steel strip have been investigated. It is shown that annealing of the hot-rolled strips in the intercritical region, Ac₁3, causes rapid decarburization and development of large columnar ferrite grains. This microstructure leads, after cold-rolling and a fast annealing treatment at temperatures between 800 and 850 °C, to a polygonal ferrite grain microstructure with magnetic properties superior to those observed typically in the same steel in the industrial fully processed condition. The results are attributed to the {100}-fiber texture developed during the final annealing. Annealing at T<800 °C or T>850 °C results in formation of {111}-fiber texture components due to recristallization or transformation of deformed ferrite leading to a negative effect on the final magnetic properties. The results suggest that annealing prior to cold rolling offers an attractive alternative processing route for the manufacture of fully processed low-C, Si-Al GNO electrical steels strips.