A high-strength cold-rolled non-oriented silicon steel for driving motors and its manufacturing method

Abstract

The invention provides high-strength cold-rolled non-orientation silicon steel used for a driving motor and a manufacturing method and belongs to the technical field of steel and iron processing. Thehigh-strength cold-rolled non-orientation silicon steel comprises the components of, by weight, 0.001-0.0015% of C, 2.5-3.0% of Si, 0.8-1.0% of Al, 0.5-0.8% of Mn, 1.0-2.0% of Cr, 0.002% or the less of N, 0.1-0.2% of Nb and the balance Fe and inevitable impurities. The secondary cold-rolling reduced quantity and an annealing technology are controlled, so that the magnetic inductive strength, the iron loss and the yield strength of the non-orientation silicon steel are balanced. According to developed steel types, after the cold-rolling and annealing technologies, the magnetic inductive strength B50 is 1.67-1.70 T, the iron loss W1.0 / 50 is 2.0-5.5 W / kg, the iron loss W1.0 / 400 is 18.8-32.12 W / kg, the lower yield strength ReL is 460-510 MPa, the tensile strength Rm is 560-640 MPa, the elongation percentage is 16.08-23.3%, and the requirements for the property aspect of common high-strength cold-rolled non-orientation silicon steel are met and exceeded.

Description

technical field [0001] The invention relates to the technical field of steel processing, in particular to a high-strength cold-rolled non-oriented silicon steel for driving motors and a manufacturing method thereof. Background technique [0002] In recent years, with the rapid development of new energy vehicles, the performance requirements of non-oriented silicon steel as the core material of drive motors and micro motors are higher. As a high-efficiency drive motor, it needs to meet high-speed rotation and obtain high torque, and at the same time, it needs to ensure high magnetic induction intensity and low high-frequency iron loss. Therefore, in actual production and use, the drive motor is required to be stronger than traditional non-oriented electrical steel by more than 200 MPa, and it is necessary to ensure that its excellent magnetic properties cannot be damaged while increasing the strength. [0003] So far, the goal of improving non-oriented magnetic induction is ...

AI Technical Summary

Problems solved by technology

Chang et al. believe that adding 0.002%-0.011% V to 0.3% Si non-oriented silicon steel can generate extremely fine VC and VN at low annealing temperature, thereby inhibiting recrystallization and grain growth, but resulting in a sharp increase in iron loss ; When the annealing temperature rises to 1073K, VC and VN dissolve back into the matrix, causing abnormal grain growth, and the {111} / / ND texture increases sharply, so the magnetic induction intensity decreases

It is also possible to improve the mechanical properties of non-oriented silicon steel by strengthening the {111} plane texture with a solid solution amount of Ti, but it will also lead to a decrease in the magnetic induction of non-oriented silicon steel.

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