Preparation method of high-silicon non-oriented electrical steel for motor

A technology of oriented electrical steel and electrical steel, which is applied in the field of electrical steel for motors, can solve the problems of unguaranteed magnetic properties, lower annealing temperature, and increased furnace bottom nodules, so as to improve mechanical properties, reduce annealing temperature, and reduce energy consumption. consumption effect

Inactive Publication Date: 2012-03-21
JIANGSU HAODA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problems brought about by high-temperature annealing are high cost, and the second is that the oxides attached to the surface of the strip are reduced to iron by hydrogen and accumulate on the surface of the furnace roll, thus causing nodulation of the furnace roll
However, it has been verified by experiments that when the silicon steel is annealed at 900°C, the hearth roll n

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing high-silicon non-oriented electrical steel for motors, the electrical steel is composed of the following components in weight percentage: C: 0.015, Si: 4.2, Mn: 0.1, Sn: 0.8, Cu: 0.30, B: 0.015, Bi: 0.04, S: 0.010, Als: 0.010, N: 0.0090, P: 0.010, and the rest are Fe and inevitable inclusions. The preparation method includes the following steps:

[0020] 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;

[0021] 2) Hot rolling and crimping: the cast slab is heated to 1050°C in the heating furnace, held for 60 minutes, and rolled to ensure the final rolling temperature above 920°C; after 5 passes of rolling, the total reduction rate is 90%. Made into a 1.5mm hot-rolled sheet and crimped at 640°C;

[0022] 3) Normalization: The temperature of the hot-rolled plate is raised to 900°C at an average heating rate...

Embodiment 2

[0027] A method for preparing high-silicon non-oriented electrical steel for motors, the electrical steel is composed of the following components in weight percentage: C: 0.030, Si: 3.6, Mn: 0.2, Sn: 0.6, Cu: 0.60, B: 0.008, Bi: 0.08, S: 0.005, Als: 0.015, N: 0.0050, P: 0.030, and the rest are Fe and inevitable inclusions. The preparation method includes the following steps:

[0028] 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;

[0029] 2) Hot rolling and crimping: the cast slab is heated to 1080°C in the heating furnace, held for 30 minutes, and then rolled to ensure a final rolling temperature above 920°C; after 6 passes of rolling, the total reduction rate is 95%. Made into a 1.2mm hot-rolled sheet and crimped at 660°C;

[0030] 3) Normalization: The temperature of the hot-rolled plate is raised to 950°C at an average heating r...

Embodiment 3

[0035] A method for preparing high-silicon non-oriented electrical steel for motors, the electrical steel is composed of the following components in weight percentage: C: 0.025, Si: 3.9, Mn: 0.15, Sn: 0.7, Cu: 0.45, B: 0.010, Bi: 0.06, S: 0.008, Als: 0.012, N: 0.007, P: 0.02, and the rest are Fe and inevitable inclusions. The preparation method includes the following steps:

[0036] 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;

[0037] 2) Hot rolling and crimping: the cast slab is heated to 1070°C in a heating furnace, held for 45 minutes, and rolled to ensure a final rolling temperature above 920°C; after multiple passes of rolling, the total reduction rate is 93%. Made into a 1.3mm hot-rolled sheet and crimped at 650°C;

[0038] 3) Normalization: The temperature of the hot-rolled plate is raised to 930°C at an average heating ra...

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PUM

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Abstract

The invention discloses a preparation method of high-silicon non-oriented electrical steel for motors; Sn, Cu, B, Bi elements are added into electrical steel, and the contents are controlled reasonably, which bring into play the functions of each element and generate synergistic effect; wherein Sn and Cu facilitate the control of the morphology and distribution of precipitates and thus influence the texture; the added B and Bi elements can greatly reduce the annealing temperature of the electrical steel with high silicon content; only an annealing temperature of 870-890 DEG C is required to obtain magnetic performance with magnetic induction intensity B50 of more than 1.7 T, and iron loss P1.5 of less than 2.7 W/kg; with the combined action of the four elements and other routine alloying elements, the microstructure of the electrical steel is improved, and thus the mechanical properties of the steel are improved. Because the annealing temperature is decreased, furnace roller nodulation is completely avoided, and the scratch of strip steel is completely avoided; the production energy consumption is reduced, and thus the production cost is reduced.

Description

technical field [0001] The invention relates to the field of electrical steel for motors, in particular to a method for preparing high-silicon non-oriented electrical steel for motors. Background technique [0002] High-grade non-oriented silicon steel is mainly used to manufacture iron cores of large motors and generators, and its main magnetic feature is extremely low iron loss. Traditionally, its manufacturing feature is that the silicon content is more than 2.5%, and more than 0.2% aluminum is added to increase the resistance in the steel, thereby reducing the iron loss. Then implement hot rolling, normalization and cold rolling processes, and carry out final annealing and coating insulation layer. In order to reduce iron loss, the final annealing temperature is required to be above 1000°C, even 1075°C. However, the problems brought about by high temperature annealing are high cost, and the second is that the oxide attached to the surface of the strip is reduced to iro...

Claims

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Application Information

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IPC IPC(8): C22C38/16C21D8/12
Inventor 沈敬栋
Owner JIANGSU HAODA
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