Effect of Nb on solution and precipitation of inhibitors in grain-oriented silicon steel

Comparison of Precipitates and Texture Evolution in Nb-Bearing Grain-Oriented Silicon Steel Produced by Conventional Processing and Novel Twin-Roll Casting

“…And the detail compositions were listed in Table 1. Here, 0.06 wt% Nb content was selected based on the other research results [19]. The carbon content was reduced to 0.005 wt% to avoid the formation of NbC according to our previous workes [18].…”

“…Fang [18] claimed that NbN is an effective additional inhibitor in strip casting grain-oriented silicon steel. Feng [19] studied the precipitation behavior and the texture evolution of grain-oriented silicon steel with different Nb contents and obtained relatively good magnetic properties in the conventional route. On the contrary, Lu [20] reported that the Nb tended to form stable carbides, which might remain in the final product even after decarburization annealing, and could deteriorate the final magnetic properties.…”

Effect of Niobium on Precipitates and Texture Evolution of Fe-3% Si Grain-oriented Electrical Steel Annealed Hot Band

“…Secondary recrystallization annealing did not proceed in sample with Nb addition, the author considered that overmuch {113} < 110 > texture prevented the growing of Goss texture. Feng et al 15) studied the dissolution and precipitation character of inhibitor by mathematical simulation after slab reheating, and made observation of the inhibitors, proved Nb(C, N) has lower solution temperature than AlN and MnS. Good dissolution property of Nb(C, N) was proved, so the character of Nb(C, N) in later manufacture steps requires further study.…”

“…11) So the dissolution temperature of Nb(C, N) should base on the solubility of Nb(C, N) in austenite, only taking the solubility of Nb(C, N) in ferrite into account 15) is incomplete. Dissolution temperature of the precipitates is calculated by Eqs.…”

Influence of Nb Content on Precipitation, Grain Microstructure, Texture and Magnetic Properties of Grain-Oriented Silicon Steel

“…Many researches show that niobium used as an assistant inhibitor formation element to form Nb(C, N) is feasible. Feng's results show that Nb(C,N) is obtained after Nb is added into silicon steel, and it makes little effect on the precipitation of MnS; moreover, the slab reheating temperature can be reduced with proper Nb content in silicon steel, but it has a negative effect with excessive Nb addition because that the inhibitors cannot dissolve into the matrix totally at high temperature [16,17]. Klaus Hulka et al report that the hot strip material of niobium microalloyed steel contains the highest volume fraction of Goss texture and that the core losses are the lowest in the sheet with NbC as main inhibitor [18].…”