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Thin-gauge non-oriented silicon steel and preparation method thereof

A technology of oriented silicon steel and thin gauge, applied in the field of thin gauge non-oriented silicon steel and its preparation, can solve the problems of high production cost, long production process, poor magnetic properties of finished products, etc., and achieves the elimination of corrugated defects and excellent mechanical strength. and the effect of magnetic properties

Active Publication Date: 2022-04-19
SHANXI TAIGANG STAINLESS STEEL CO LTD
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Problems solved by technology

But there is also the disadvantage that the magnetic properties of the finished product are very poor
[0011] A Chinese patent "Production method of non-oriented silicon steel for high-speed motors" (application number: 201910578952.4), which discloses the use of dislocation strengthening of the residual unrecrystallized structure of the finished product, and the use of a secondary cold rolling method, which has poor magnetic properties and production processes Shortcomings of length and high production cost

Method used

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  • Thin-gauge non-oriented silicon steel and preparation method thereof
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  • Thin-gauge non-oriented silicon steel and preparation method thereof

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preparation example Construction

[0057] Specifically, the present invention provides a thin-gauge non-oriented silicon steel with a rolling direction yield strength Rp0.2≥425MPa and a preparation method thereof, which specifically includes the following steps:

[0058] (1) After the converter is tapped, use RH refining to obtain the chemical components and weight percentages required by the present invention: C≤0.005%, Si: 2.0-4.0%, Mn: 0.20-2.0%, P≤0.02%, S≤ 0.005%, Al: 0.30-1.4%, N≤0.005%, Ti≤0.005%, Nb≤0.005%, and (Si wt%+1.3Al wt%) / Mn wt%≥2.1, 3.0≤Siwt%+Mn wt %≤4.4, the rest is iron and unavoidable impurities;

[0059] (2) Continuous casting of the obtained molten steel to form a continuous casting slab of a certain size. The thickness of the slab generally ranges from 200 to 300 mm, and the size of the slab has little influence on the performance of the present invention, so there is no deliberate requirement. The continuous casting equipment uses the current mainstream vertical bending continuous cast...

Embodiment 1

[0073] Embodiment 1: the influence of alloy chemical composition on production stability

[0074] RH refining obtained the main alloy chemical composition and proportion as shown in Table 1 below. The ladle temperature during continuous casting was 1500-1525°C, the cooling rate in the secondary cooling zone was 18°C / min, and the cross-sectional size of the slab was 230×1050mm. The billet heating temperature is 1180°C, and it is heated for 1.5h. The cast slab is roughly rolled to a target thickness of 29mm, and rolled to a target thickness of 1.85mm by seven passes in a hot continuous rolling mill. The hot-rolled coils are normalized at a normalization speed of 15 m / min. After pickling, the normalized coils are cold-rolled on a 20-roll mill. During the production process, the rolling load, normalizing temperature and cold rolling conditions of the sixth stand of hot continuous rolling and finishing rolling are shown in Table 1 below.

[0075]In Comparative Examples 1-6, 1-7,...

Embodiment 2

[0079] Example 2: Influence of the cooling rate in the secondary cooling zone of continuous casting on the ridge-like defects of the finished tile

[0080] The chemical composition and ratio of main alloys obtained by RH refining are shown in Table 2 below. The ladle temperature during the continuous casting process is 1500-1525°C, and different cooling rates in the secondary cooling zone are used respectively. The cross-sectional size of the billet is 240×1050mm. The billet heating temperature is 1190°C, and it is heated for 2.0 hours. The cast slab is roughly rolled to the target thickness of 27mm, and rolled to the target thickness of 1.90mm by seven passes in the hot continuous rolling mill. The normalized speed is 20m / min. After 7 passes of cold rolling to the target thickness of 0.27mm, the cold rolling reductions of the first and last pass are respectively 15.7% and 18.3%. The cold coil is annealed at an annealing speed of 100m / min. See the table below for the anneal...

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Abstract

The invention discloses thin-gauge non-oriented silicon steel and a preparation method thereof, belongs to the technical field of electrical steel and rolling thereof, and solves the technical problems that traditional high-grade non-oriented silicon steel is low in mechanics and novel ultrahigh-strength silicon steel is poor in magnetism. According to the solution, the preparation method of the thin-gauge non-oriented silicon steel comprises the following steps of converter smelting, RH refining, continuous casting, heating in a heating furnace, hot rolling, normalizing, acid pickling, cold rolling, annealing and coating. Chemical components in RH refined steel, the cooling speed of a casting blank in a secondary cooling area in the continuous casting process, the thickness of a hot-rolled strip in the hot rolling process, the normalizing speed and the normalizing temperature of the normalizing process, the reduction rates of the first pass and the last pass in the cold rolling process and the annealing speed and the annealing temperature of the annealing process are limited respectively. Fine grain strengthening and Si and Mn solid solution strengthening are adopted, and the product has excellent mechanical and magnetic performance, can be used for a stator and a rotor at the same time, and can meet the use requirements of driving motors of most of new energy automobiles at present.

Description

technical field [0001] The invention belongs to the technical field of electrical steel and its rolling, and in particular relates to a thin-gauge non-oriented silicon steel and a preparation method thereof. Background technique [0002] Electrical steel is a functional material. It has always been considered that the most important performance of electrical steel is magnetic properties. However, with the vigorous development of the motor industry, higher requirements are placed on the mechanics of electrical steel: [0003] On the one hand, for the yoke steel used in the rotor of large generators: the yoke is the main body of the rotor and has the function of hanging the magnetic poles. Therefore, the rotor has high requirements on the mechanics of the material used for the yoke during the rotation process. In some models The high-strength hot-rolled carbon steel plate is replaced by silicon steel; [0004] On the other hand, for the rotor of medium and large motors: due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/12C21D1/26
CPCC22C38/02C22C38/04C22C38/06C22C38/004C21D8/1222C21D8/1233C21D8/1272C21D1/26
Inventor 潘振东林媛张文康吴昆赵向东赵建伟
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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