Development of a new generation of high permeability non-oriented silicon steels

Magnesium Non-metallic Inclusions in Non-oriented Electrical Steel Sheets

“…There have been reports about a new generation of high-permeability, lowcore-loss, non-oriented, electrical steel sheets based on an improved alloy purity. 1,2) In addition, the production of cleaner steels has led to a growing emphasis on the proper control of non-metallic inclusions. 3) Non-oriented, electrical steel sheets are produced from Fe-Si-Al alloys.…”

Low core loss non-oriented silicon steels

“…In the last SMM17 conference, the authors reported the development of a new generation of high permeability non-oriented silicon steel grades, comprising medium and low core loss grades [1], based on improving alloy purity and texture. Significant reduction in alloy content, for the same grade specification, was obtained.…”

Effect of annealing prior to cold rolling on magnetic and mechanical properties of low carbon non-oriented electrical steels

“…For these applications, low energy losses and high permeability are required [1][2][3]. Along with good magnetic quality, the ability of the steel to be shaped by stamping is also increasingly important.…”

“…Finally, after stamping from strip blanks, the laminations are subjected to long term grain growth and decarburization annealing treatment at temperatures below Ac 1 (the ferrite to austenite transformation temperature on heating) [4,[15][16][17]. Alternative processing routes have been reported for production of low core losses electrical steel grades, such as optimized hot rolling, annealing prior to cold rolling and cold rolling in two steps with intermediate annealing [18,19]. Annealing prior to cold rolling has been investigated mainly in ultra-low carbon electrical steels [20,21].…”

“…Although there was no significant effect of temperature of annealing prior to cold rolling on the final grain size, the texture developed during the final annealing caused an improvement in the core losses. Paolinellia and da Cunha [18] produced a low core loss electrical steel with 3%(SiþAl) by optimizing the hot rolling process followed by a two step cold rolling. The optimization of the core losses was attributed to the decrease of the [1 1 1]//ND texture component and the simultaneous increase of the [1 0 0]//ND texture component.…”