Comprehensive Influence of the Normalized and Final Annealing Process on High‐Strength Nonoriented Silicon Steel

Abstract

High‐strength nonoriented silicon steel is widely used to make automobile engines. On the basis of ensuring certain magnetic properties, it also needs higher mechanical properties. The matching of magnetic and mechanical properties can be achieved by comprehensive control of normalized and final annealing. Different annealing temperatures and times are applied to clarify the change of texture, thus influencing magnetic induction, iron loss, and mechanical properties. Route B obtains the optimal normalization effect. The type and volume fraction of texture in the final annealing sheet differ a lot after incomplete and fully normalized annealing, depending on the degree of recrystallization. The final texture composition remains unchanged when normalized annealing is incomplete, while full normalized annealing leads to the disappearance of some textures. The mechanical and magnetic properties of the final annealing sheet show consistency when fully normalized. The sheet achieved by route B2 are Rp0.2 ≈513 MPa, Rm ≈646 MPa, elongation ≈17.2%, P10/400 ≈ 28.7 W kg−1, and B50≈1.64 T, achieving the best mechanical and magnetic properties in combination.