CN-121992301-A - Non-oriented electrical steel with excellent sheet punching property and production method thereof

Abstract

The invention relates to the technical field of non-oriented electrical steel production, in particular to non-oriented electrical steel with excellent punching performance and a production method thereof, wherein the chemical components in percentage by weight are ：C：≤0.002%,Si：0.50%～1.50%,Mn：0.5%～1.5%,Te：0.005%～0.015%,Ca：0.001%～0.003%,RE：0.005%～0.015%,S：0.01%～0.05%,N：≤0.002%,Als：0.20%～0.60%, and the balance of Fe and unavoidable residual elements, RE comprises Ce and La, mn/S is more than or equal to 25, and the invention has the beneficial effects that on the premise of keeping optimized magnetic performance, the height of punched burrs is obviously reduced, the service life of a die is prolonged, the surface finish of a punched section and the qualification rate of the punched sheet are improved, so that the overall performance of a motor is optimized.

Inventors

• LIU WENPENG
• HOU RUIQIANG
• LI FUQIANG
• GAO ZHENYU
• CHEN CHUNMEI
• LI YADONG
• SUN CHAO
• HU WANQING
• LI ZHIJIAN
• JIA ZENGBEN

Assignees

• 鞍钢股份有限公司

Dates

Publication Date

20260508

Application Date

20260210

Claims (7)

1. 1. A non-oriented electrical steel with excellent sheet punching property is characterized in that the chemical components in percentage by weight are ：C：≤0.002%,Si：0.50%～1.50%,Mn：0.5%～1.5%,Te：0.005%～0.015%,Ca：0.001%～0.003%,RE：0.005%～0.015%,S：0.01%～0.05%,N：≤0.002%,Als：0.20%～0.60%,, and the balance is Fe and unavoidable residual elements, wherein RE comprises Ce and La, and Mn/S is more than or equal to 25.
2. 2. The non-oriented electrical steel with excellent stamping property according to claim 1, wherein the height of burrs is less than or equal to 0.017mm, the roughness Ra of a stamping surface is 0.8-1.2 mu m, and the qualification rate of automatic lamination is 97-99% under the working condition of the non-oriented electrical steel with excellent stamping property.
3. 3. The method for producing a non-oriented electrical steel excellent in sheet formability according to any one of claims 1 to 2, wherein the production process of the non-oriented electrical steel excellent in sheet formability comprises converter smelting, continuous casting, hot rolling, cold rolling and annealing; The specific method comprises the following steps: The converter smelting is adopted, wherein the sulfur content at the end point of the converter is 0.010-0.020%, sulfur wires are fed in the refining process, the wire feeding speed is 180-220 m/min, the argon flow is 40-60L/min, the sulfur yield is more than or equal to 85%, and the final deoxidization is carried out by adopting Ca-Si wires; Continuous casting, namely adopting a crystallizer for electromagnetic stirring and combining light reduction, wherein a weak cooling process is adopted in a continuous casting secondary cooling section, and the specific water quantity is 0.3L/kg-0.5L/kg; Hot rolling, namely, the furnace temperature of a preheating section of a heating furnace is 850-900 ℃, the soaking temperature is 1180-1220 ℃, the reduction of each pass of rough rolling is controlled to be 10-25%, the rolling speed is controlled to be 2.2-2.8 m/s, the rolling temperature is 1120-1180 ℃, and the final rolling temperature is set to be 880-960 ℃; Cold rolling, namely adopting a 5-frame six-roller mill to perform continuous rolling, wherein the total rolling reduction is 70% -90%, the first rolling reduction is 30% -35%, the last rolling reduction is 10% -15%, the emulsion temperature is 42-48 ℃, and the emulsion concentration is 3.5% -4.5%; The annealing is carried out by adopting sectional annealing, wherein the first soaking temperature is 830-870 ℃, the first soaking time is 2-3 min, the furnace tension is 1.5-2.0 MPa, the second soaking temperature is 930-970 ℃, the second soaking time is 1-2 min, the furnace tension is 0.8-1.5 MPa, the semi-organic + chromate insulating coating is coated after annealing, the single-sided coating weight is 0.8g/m 2 ～1.2g/m 2 , and the curing temperature is 300-350 ℃.
4. 4. The method for producing high-efficiency high-strength thin-gauge non-oriented electrical steel according to claim 3, wherein the converter smelting feeding sulfur line adopts a FeS cored wire.
5. 5. The method for producing high-efficiency high-strength thin-gauge non-oriented electrical steel according to claim 3, wherein the cold rolling mill adopts positive and negative bending rolls and CVC plate shape control of working rolls and intermediate rolls, and the same plate difference is less than or equal to 7 μm.
6. 6. The method for producing high-efficiency high-strength thin gauge non-oriented electrical steel according to claim 3, wherein the adhesion of the insulating coating reaches class A, and the interlayer resistance is not less than 150 Ω cm 2/sheet.
7. 7. The method for producing high-efficiency high-strength thin gauge non-oriented electrical steel according to claim 3, wherein the thickness of the finished strip steel is 0.35mm, 0.50mm or 0.65mm.

Description

Non-oriented electrical steel with excellent sheet punching property and production method thereof Technical Field The invention relates to the technical field of non-oriented electrical steel production, in particular to non-oriented electrical steel with excellent punching performance and a production method thereof. Background The magnetic properties of non-oriented electrical steel, which is used as a core material for iron cores of small motors, general motors and various electrical equipment, have long been regarded as the primary factor for determining the efficiency of the whole machine. However, with the higher requirements on the energy efficiency, noise and service life of the motor in the fields of household appliances, automobiles, industrial automation and the like, people gradually realize that the impact of the punching performance of the iron core on the performance of the whole machine is no less than the magnetic performance of the raw materials. The punching sheet has excellent performance, can keep the heredity of the magnetic performance in the processing process, and can directly determine the size precision, the assembly consistency, the service life of a cutter and the operation reliability of a final motor of the iron core. In the prior art, electrical steel strips are continuously blanked by a high-speed progressive die to form stator and rotor laminations. In the blanking process, the steel strip is subjected to shearing deformation and is accompanied with local work hardening, burr generation and microstructure damage. The excessive burrs can cause the reduction of lamination coefficients and the increase of inter-chip short-circuit eddy current loss, and the rough blanking surface and the excessive corner collapse can reduce the riveting strength of the lamination, cause the drift of the inner diameter and the outer diameter of the iron core, and finally cause the uneven air gap between the stator and the rotor and the increase of vibration noise. To suppress the above drawbacks, conventional approaches have focused on optimizing the mold material, edge coating, or lubrication conditions, while the contribution of the steel base itself to the sheet properties has been ignored for a long time. In recent years, as the cost of dies increases, the frequency of tool changes increases, and the requirements of automated production lines on dimensional stability become more stringent, the industry has begun to focus on "active" improvements in die stamping through steel-based composition and process innovation, rather than passive reliance on die maintenance. The existing non-oriented electrical steel component system generally takes solid solution strengthening elements such as Si, al, mn and the like as main components, but low iron loss can be obtained, the quality of a shearing surface is often deteriorated along with the increase of the shearing strength, the contradiction between magnetic property and sheet punching property is formed, meanwhile, the conventional sulfide and carbonitride control thought is focused on harmlessness or quantity minimization, and the active regulation and control potential of the form and distribution of the sulfide and carbonitride control thought on the punching behavior cannot be utilized. Therefore, how to reduce shear resistance, improve shear plane quality, reduce die wear and synchronously improve subsequent cutting dimensional accuracy on the premise of maintaining and even optimizing magnetic performance becomes a technical bottleneck to be broken through in the field of non-oriented electrical steel. Disclosure of Invention In order to overcome the defects of the prior art, the invention provides the non-oriented electrical steel with excellent punching performance and the production method thereof, wherein sulfur and the cooperative elements thereof are added to improve the punching performance of the non-oriented electrical steel, the height of punching burrs is obviously reduced on the premise of keeping the optimized magnetic performance, the service life of a die is prolonged, the surface light cleanliness of the punching fragments and the qualification rate of the punching sheets are improved, so that the overall performance of a motor is optimized, the production efficiency of the motor core is improved, and the processing cost of the core is reduced. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: A non-oriented electrical steel with excellent sheet punching property comprises the following chemical components by weight percent ：C：≤0.002%,Si：0.50%～1.50%,Mn：0.5%～1.5%,Te：0.005%～0.015%,Ca：0.001%～0.003%,RE：0.005%～0.015%,S：0.01%～0.05%,N：≤0.002%,Als：0.20%～0.60%,, and the balance of Fe and unavoidable residual elements, wherein RE comprises Ce and La, and Mn/S is more than or equal to 25. The following details the reasons for designing the chemical components of the present inven