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High-strength special-purpose cold-rolled non-oriented electrical steel and producing method thereof

A technology of oriented electrical steel and production method, which is applied in the field of production of cold-rolled non-oriented electrical steel products for electromagnetic switches, and can solve problems such as low mechanical life, brittle steel sheets, and large volume

Active Publication Date: 2014-06-25
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Cold-rolled silicon steel strips for electromagnetic switches generally refer to non-oriented silicon steel with a thickness of about 0.7mm and a silicon content of about 3%. This product was produced abroad in the 1970s, and hot-rolled silicon steel sheets were mainly used in China in the early days. Manufacturing, not only the volume is large, but the steel sheet is relatively brittle, and the mechanical life is low, only 3 to 5 million times. At present, there are few technologies about electromagnetic switches. The hot-rolled The silicon steel sheet improves the shock resistance by adjusting the chemical composition of the silicon steel, and its shock resistance is greater than 10 million times
No report on cold-rolled non-oriented electromagnetic switch steel was retrieved

Method used

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  • High-strength special-purpose cold-rolled non-oriented electrical steel and producing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: C: 0.0025%, Si: 2.85%, Mn: 0.23%, P: 0.012%, S: 0.001%, Als: 0.55%, N: 0.0021%, Ti: 0.001%, Nb: 0.0015%, V : 0.0013%, the rest is iron and other unavoidable impurity elements.

[0017] The process steps are as follows:

[0018] a) Converter smelting: RH vacuum refining treatment to control the content of each alloy element;

[0019] b) Continuous casting: the molten steel is cast into steel slabs by means of continuous casting, and the specification of the slab is ASP100mm;

[0020] c) Hot rolling: use low temperature heating, billet heating temperature is 1080°C, finish rolling and final rolling coiling adopt high temperature plan, start rolling temperature is 1020°C, finish rolling temperature is 880°C, coiling temperature is 720°C, so that the surface crystallization structure can be increased to 38%, the thickness of the hot-rolled sheet is controlled at 1.2mm, and the hot-rolled coil is pre-cold-rolled;

[0021] d) Normalization: process speed 45m / min...

Embodiment 2

[0024] Embodiment 2: C: 0.0020%, Si: 2.6%, Mn: 0.3%, P: 0.015%, S: 0.0013%, Als: 0.68%, N: 0.0020%, Ti: 0.001%, Nb: 0.0012% , V:0.0016%, the rest is iron and other unavoidable impurity elements.

[0025] The process steps are as follows:

[0026] a) Converter smelting: RH vacuum refining treatment to control the content of each alloy element;

[0027] b) Continuous casting: the molten steel is cast into steel slabs by means of continuous casting, and the specification of the slab is ASP100mm;

[0028] c) Hot rolling: use low temperature heating, billet heating temperature is 1100°C, finish rolling and final rolling coiling adopt high temperature plan, start rolling temperature is 1030°C, finish rolling temperature is 890°C, coiling temperature is 725°C, so that the surface crystallization structure can be increased to 45%, the thickness of the hot-rolled sheet is controlled at 1.7mm, and the hot-rolled coil is pre-cold-rolled;

[0029] d) Normalization: the process speed is...

Embodiment 3

[0032] Embodiment 3: C: 0.0028%, Si: 2.95%, Mn: 0.3%, P: 0.018%, S: 0.0011%, Als: 0.22%, N: 0.0022%, Ti: 0.001%, Nb: 0.0019% , V:0.0014%, the rest is iron and other unavoidable impurity elements.

[0033] The process steps are as follows:

[0034] a) Converter smelting: RH vacuum refining treatment to control the content of each alloy element;

[0035] b) Continuous casting: the molten steel is cast into steel slabs by means of continuous casting, and the specification of the slab is ASP100mm;

[0036] c) Hot rolling: adopt low-temperature heating, billet heating temperature is 1090°C, finish rolling and final rolling coiling adopt high-temperature plan, start rolling temperature is 1035°C, finish rolling temperature is 895°C, coiling temperature is 730°C, so that the surface crystallization structure can be increased to 48%, the thickness of the hot-rolled sheet is controlled at 2.2mm, and the hot-rolled coil is pre-cold-rolled;

[0037] d) Normalization: the process speed...

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Abstract

The invention provides high-strength special-purpose cold-rolled non-oriented electrical steel and a producing method thereof. The steel comprises following chemical components by weight: not more than 0.0030% of C, 2.5-3.0% of Si, 0.10-0.5% of Mn, 0.005-0.20% of P, not more than 0.0015% of S, not more than 0.0040% of N and 0.140-1.10% of Als, with the balance being Fe and other unavoidable residual elements. The producing method includes smelting, continuous casting, hot rolling, normalizing, cold rolling and annealing. The electrical steel is low in coercive force, high in hardness, free of magnetic aging, high in strength and high in impact resistance. The product is flexible in production and can be produced in the same line with a high-grade product. The electrical steel has excellent electromagnetic performances, and can be widely used for manufacturing iron core materials of electromagnetic switches. The application field of the electrical steel is broadened.

Description

technical field [0001] The invention belongs to the technical field of production of electrical steel products, in particular to a production method of cold-rolled non-oriented electrical steel products for electromagnetic switches. Background technique [0002] The steel used for electromagnetic switches is characterized by sensitive magnetic response characteristics under low magnetic field (high magnetic permeability under low field strength) and wear resistance; at the same time, it is required to have excellent electromagnetic properties and good impact resistance (more than 10 million times) , both high strength and high hardness. [0003] Cold-rolled silicon steel strips for electromagnetic switches generally refer to non-oriented silicon steel with a thickness of about 0.7mm and a silicon content of about 3%. This product was produced abroad in the 1970s, and hot-rolled silicon steel sheets were mainly used in China in the early days. Manufacturing, not only the vol...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C33/04C21D8/12
Inventor 高振宇陈春梅张智义金文旭李亚东罗理李文权张仁波李元华刘文鹏
Owner ANGANG STEEL CO LTD
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