Preparation method of non-oriented thin silicon steel strip for motor

A technology of oriented silicon steel and thin strip, which is applied in the field of preparation of non-oriented silicon steel thin strip for electric motors, can solve the problems of narrow window value range, difficult to control, unstable product performance, etc. The mechanical formation enhances and promotes the effect of promoting dynamic recovery and recrystallization

Inactive Publication Date: 2012-03-28
JIANGSU HAODA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from its technical scheme that although it cancels the normalization process, the window value range limited by the hot rolling and annealing process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing non-oriented silicon steel thin strips for motors, the silicon steel is composed of the following components in weight percentage: C: 0.015, Si: 1.7, Mn: 0.1, Sn: 0.8, Al: 1.1, Cu: 0.60, Ti: 0.008, Sb: 0.08, S: ≤0.006, N: ≤0.005, P: ≤0.02, and the rest are Fe and unavoidable inclusions. The preparation method includes the following steps:

[0024] 1) Smelting and pouring: Melting and refining according to the above composition, and continuous casting into blanks after the composition meets the requirements of the pre-furnace inspection;

[0025] 2) Hot rolling and crimping: the cast slab is heated to 1130°C in the heating furnace, held for 20 minutes, and rolled to ensure the final rolling temperature above 950°C; after multi-pass rolling, the single-pass reduction rate is controlled to 25 %, rolled into a 1.5mm hot-rolled sheet, and crimped at 640°C;

[0026] 3) Normalization: raise the hot-rolled sheet to 960°C, keep it warm for 180s, then cool...

Embodiment 2

[0031] A method for preparing non-oriented silicon steel strips for motors, the silicon steel is composed of the following components in weight percentage: C: 0.030, Si: 1.4, Mn: 0.2, Sn: 0.6, Al: 1.5, Cu: 0.30, Ti: 0.015, Sb: 0.04, S: ≤0.006, N: ≤0.005, P: ≤0.02, and the rest are Fe and inevitable inclusions. The preparation method includes the following steps:

[0032] 1) Smelting and pouring: Melting and refining according to the above composition, and continuous casting into blanks after the composition meets the requirements of the pre-furnace inspection;

[0033] 2) Hot rolling and crimping: the cast slab is heated to 1200°C in the heating furnace, held for 15 minutes, and then rolled to ensure the final rolling temperature above 950°C; after multi-pass rolling, the single-pass reduction rate is controlled to 35 %, rolled into a 1.2mm hot-rolled sheet, and crimped at 660°C;

[0034] 3) Normalization: raise the hot-rolled sheet to 980°C, keep it warm for 120s, then cool ...

Embodiment 3

[0039] A method for preparing non-oriented silicon steel strips for motors, the silicon steel is composed of the following components in weight percentage: C: 0.025, Si: 1.6, Mn: 0.15, Sn: 0.7, Al: 1.3, Cu: 0.45, Ti: 0.011, Sb: 0.06, S: ≤0.006, N: ≤0.005, P: ≤0.02, and the rest are Fe and inevitable inclusions. The preparation method includes the following steps:

[0040] 1) Smelting and pouring: Melting and refining according to the above composition, and continuous casting into blanks after the composition meets the requirements of the pre-furnace inspection;

[0041] 2) Hot rolling and crimping: the cast slab is heated to 1170°C in the heating furnace, held for 18 minutes, and then rolled to ensure the final rolling temperature above 950°C; after multi-pass rolling, the single-pass reduction rate is controlled to 30 %, rolled into a 1.4mm hot-rolled sheet, and crimped at 650°C;

[0042] 3) Normalization: raise the hot-rolled sheet to 970°C, keep it warm for 150s, then cool t...

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PUM

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Abstract

The invention discloses a preparation method of a non-oriented thin silicon steel strip for a motor. The method is characterized in that under the guidance of a silicon steel alloying theory, the chemical compositions of silicon steel are adjusted on the basis of a large number of experiments, so as to enable alloying elements to act synergistically, enable Alpha-Gamma phase transition to occur when continuous casting plate slabs are heated and hot-rolled, promote hot-rolled tissue to be dynamically recovered and recrystallized, and eliminate coarse deformed grains (fiber-like tissue) in the middle of the strip steel; and to be matched with composition adjustment, technological parameters of hot rolling is properly controlled, so as to radically solve the problem of corrugated defects; the magnetic performance of the silicon steel can be guaranteed at the same time, and the mechanical performance of the silicon steel is improved to a certain degree; and the prepared thin silicon steel strip can be enabled to satisfy the use demand of the motor.

Description

technical field [0001] The invention relates to the field of silicon steel for motors, in particular to a method for preparing a non-oriented silicon steel strip for motors. Background technique [0002] Non-oriented electrical steel sheets are mainly used as materials for motors and small EI iron cores. When electrical steelmaking is produced by continuous casting, if the chemical composition Si>1.65%, C<0.006%, there will be no α→γ phase transformation in the hot rolling process, and the coarse (100) formed in the continuous casting slab Due to the slow dynamic recovery and recrystallization during the hot rolling process, the columnar grains cannot be completely broken. Coarse and elongated deformed grains are formed near the thickness center of the hot rolled sheet, mainly {100}<011> fibrous structure. This structure is difficult to recrystallize during cold rolling and annealing, so that a kind of uneven surface defect is formed on the finished electrical s...

Claims

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Application Information

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IPC IPC(8): C22C38/60C21D8/02
Inventor 沈敬栋
Owner JIANGSU HAODA
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