CN-121992298-A - Non-oriented silicon steel for high-speed rotating motor and manufacturing method thereof

CN121992298ACN 121992298 ACN121992298 ACN 121992298ACN-121992298-A

Abstract

The invention provides non-oriented silicon steel for a high-speed rotating motor and a manufacturing method thereof, wherein the non-oriented silicon steel comprises the following components in percentage by weight of less than or equal to 0.004% of C, 1.3-1.6% of Si, 0.2-0.5% of Mn, 0.15-0.30% of Als, 0.05-0.10% of P, less than or equal to 0.005% of S, less than or equal to 0.005% of N, and the balance of Fe and unavoidable impurities. The manufacturing method comprises the steps of continuous casting of a slab with molten steel, hot rolling, coiling, pickling, primary cold rolling, annealing and secondary cold rolling, wherein the thickness of the silicon steel product is 0.35mm, the iron loss P 1.5/50 is 3.1-3.3W/kg, the B 5000 is 1.72-1.74T, the yield strength is 300-330 MPa, the tensile strength is 450-480 MPa, and the hardness HV1 is 140-150. In the molten steel continuous casting process, the thickness of a cast slab is 200-260 mm, the slab is directly loaded into a heating furnace for heating, the temperature of the heating furnace is controlled to be 1100-1250 ℃, and the heating and heat preserving time is not less than 210min. In the hot rolling process, 7 passes of finish rolling are carried out to obtain a hot rolled plate with the thickness of 2.0-2.3 mm, and the final rolling temperature is required to be controlled at 650-745 ℃. The invention can solve the problem that the non-oriented silicon steel for the high-speed rotating motor can not have high magnetic induction and high strength at the same time.

Inventors

QI XUAN
SHI LIFA
XIA XUELAN
LIU QINGSONG
ZHAN YUNGAO
XU WENXIANG
CHEN MINGXIA
Ding Shineng

Assignees

马鞍山钢铁有限公司

Dates

Publication Date: 20260508
Application Date: 20260127

Claims (10)

1. The non-oriented silicon steel for the high-speed rotating motor is characterized by comprising the following components, by weight, less than or equal to 0.004% of C, 1.3-1.6% of Si, 0.2-0.5% of Mn, 0.15-0.30% of Als, 0.05-0.10% of P, less than or equal to 0.005% of S, less than or equal to 0.005% of N, and the balance of Fe and unavoidable impurities.
2. A method for manufacturing non-oriented silicon steel for high-speed rotating electrical machines according to claim 1, characterized in that it comprises: continuously casting a plate blank by molten steel; Hot rolling; Coiling; Acid washing; Primary cold rolling; Annealing and Secondary cold rolling; Wherein the thickness of the silicon steel product is 0.35mm, the iron loss P 1.5/50 is 3.1-3.3W/kg, the B 5000 is 1.72-1.74T, the yield strength is 300-330 MPa, the tensile strength is 450-480 MPa, and the hardness HV1 is 140-150.
3. The method for producing non-oriented silicon steel for high-speed rotating electrical machines according to claim 2, wherein in the molten steel continuous casting process, the thickness of the cast slab is 200-260 mm, and the slab is directly charged into a heating furnace for heating, the temperature of the heating furnace is controlled to 1100-1250 ℃, and the heating and heat preservation time is not less than 210min.
4. The method for producing non-oriented silicon steel for high-speed rotating electrical machines according to claim 2, wherein in the hot rolling step, 7 passes of finish rolling are performed to obtain a hot rolled sheet having a thickness of 2.0 to 2.3mm, and the finishing temperature is controlled to 650 to 745 ℃.
5. The method for producing non-oriented silicon steel for high-speed rotating electrical machines according to claim 2, wherein in the coiling step, the coiling temperature is controlled to 550-600 ℃, and the steel is naturally cooled to normal temperature after coiling.
6. The method for producing non-oriented silicon steel for high-speed rotating electrical machines according to claim 2, wherein in the pickling step, the hot-rolled strip is subjected to a normalizing pickling line, the normalizing temperature is controlled to 880-920 ℃, the normalizing time is controlled to 2-4 min, the hot-rolled strip is cooled to 600-700 ℃ at 5-10 ℃ per second after normalizing, then cooled to below 100 ℃ at 20-50 ℃ per second, and then subjected to pickling, and the pickling is performed with 55% hydrochloric acid by volume, and the pickling temperature is 75 ℃.
7. The method for producing non-oriented silicon steel for high-speed rotating electrical machines according to claim 2, wherein in the primary cold rolling step, the normalized pickled plate is rolled to a target thickness of 0.365 to 0.372mm by 5 to 6 passes by a primary cold rolling method, and the total rolling reduction is 81.25 to 84.15%.
8. The method for producing non-oriented silicon steel for high-speed rotating electrical machines according to claim 2, wherein in the annealing step, the cold rolled sheet is continuously annealed at 830 to 900 ℃ for 240 to 480 seconds.
9. The method for producing non-oriented silicon steel for high-speed rotating electrical machines according to claim 2, characterized in that in the secondary cold rolling step, the secondary cold rolling reduction is required to be controlled to be 4% -6% and the target thickness of the finished product is 0.35mm.
10. The method for manufacturing non-oriented silicon steel for high-speed rotating electrical machines according to claim 2, further comprising directly alkaline washing after secondary cold rolling, coating an insulating paint by a coating roller, and then curing the insulating paint at 380-650 ℃.

Description

Non-oriented silicon steel for high-speed rotating motor and manufacturing method thereof Technical Field The invention relates to the technical field of silicon steel manufacturing, in particular to non-oriented silicon steel for a high-speed rotating motor and a manufacturing method thereof. Background Silicon steel is mainly used for producing various rotating electrical machines, transformers, generators and the like. Non-oriented silicon steel is an important soft magnetic alloy material indispensable in electric power, electronics, military industry and vehicles as a raw material for the production of various rotating electrical machines. With the development of non-oriented silicon steel, the mechanical properties of the silicon steel are more concerned when the non-oriented silicon steel is selected according to the magnetic properties in different application fields, and particularly, the rapid development of new energy automobile driving motors in recent years is realized, and the mechanical properties of the non-oriented silicon steel are more considered in the design of the motors. In the field of high-speed motors, the motor generates huge centrifugal force when rotating at a high speed, and therefore, the non-oriented silicon steel material is required to have excellent magnetic properties of low iron loss and high magnetic induction, and simultaneously has higher strength to resist the centrifugal force generated in the rotation of the motor. In order to improve the strength of silicon steel materials, the prior art basically improves the strength and reduces the iron loss by improving the percentage of alloy elements, and the application field is mainly in the aspect of a new energy automobile driving motor, and is less applied in the field of high-speed industrial motors. For example, the high-strength non-oriented silicon steel ribbon and the preparation method thereof provided by the patent CN110004381A comprise 0.5-1.0% of Al, 3.0-3.5% of Si, 0.1-1.0% of Mn, 1.0-2.0% of Cu, and the balance of Fe and unavoidable impurities. The invention mainly improves strength by improving the content of alloy elements, has higher cost, and the patent CN107130169B provides a high-strength cold-rolled non-oriented silicon steel and a manufacturing method thereof, and improves strength by adding Cu and Ni elements and controlling the reduction of secondary cold rolling and an annealing time-efficient process, wherein the Ni element has higher price, higher preparation cost, complex working procedure and low production efficiency, the patent CN108396233A provides the high-strength non-oriented silicon steel and the manufacturing method thereof, and the chemical components of the high-strength non-oriented silicon steel comprise, by weight, 0.1% -0.4% of Al, 1.3% -2.0% of Si, 0.3% -0.7% of Mn, 0.02% -0.10% of P, 0.01% -0.07% of Sb, and the balance of Fe and unavoidable impurities, and the silicon steel produced by the method has yield strength of more than or equal to 270MPa, the tensile strength of more than or equal to 410MPa, but the silicon steel produced by the patent has poor magnetic property, iron loss P 1.5/50 reaches 3.9W/Kg, and magnetic induction B 5000 is only 1.70T, and the high-performance is difficult to meet the requirement of high magnetic property. The high alloy content non-oriented silicon steel is mainly applied to the fields of new energy automobile driving motors, military industry, aviation and the like, the motor rotating speed in the fields can reach 15000r/min, the general rotating speed is more than 3000r/min, and in the field of high-speed rotating industrial motors below 10000r/min, if the high alloy content non-oriented silicon steel is adopted, the iron loss is lower, the strength is higher, but the magnetic induction is reduced due to high alloy elements, the requirement of the high-speed industrial motor on the high magnetic induction of the silicon steel cannot be met, and the mechanical properties such as low elongation, high hardness and the like are not beneficial to the blanking of the stator and the rotor of the industrial motor. Therefore, there is a need to develop a new non-oriented silicon steel for a high-speed rotating electrical machine, which solves the problem that the non-oriented silicon steel for a high-speed rotating electrical machine cannot have both high magnetic induction and high strength. Disclosure of Invention The invention aims to provide non-oriented silicon steel for a high-speed rotating motor and a manufacturing method thereof, which are used for solving the problem that the conventional non-oriented silicon steel for the high-speed rotating motor cannot have both high magnetic induction and high strength. In order to solve the technical problems, the invention provides non-oriented silicon steel for a high-speed rotating motor, which comprises the following components, by weight, less than or equal to 0.004% of C, 1.3-1.6% of Si, 0.2-0.5% o