Effects of Ni Addition on Microstructure and Properties of Non-oriented Silicon Steels by Twin-roll Casting Process

The effects of Ni on 3.2wt% Si non-oriented silicon steel microstructure, texture, magnetic performance and mechanical properties were studied when adding 1.0% Ni by OM, XRD and EBSD. The results show that under the same rolling process and annealing process, the test steel with 1.0wt% Ni addition forms stronger cubic texture, GOSS texture and weaker woven texture, and the grain size is larger than that without Ni addition. When the process is annealed at 650-900 ℃for 2 min, the magnetic induction strength B₅₀ of the test steel with 1.0wt% Ni is 0.01 T higher than that without Ni, the iron loss P_15/50 is at least 0.5 W/kg lower, the iron loss P10/400is at least 1.0 W/kg lower, and the yield strength is 20 MPa higher, that is, Ni elements can improve the magnetic properties and yield strength of non-oriented silicon steel.