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Manufacturing method of low-coercive force electromagnetic pure ion cold-rolled sheet

An electromagnetic pure iron and cold-rolled thin plate technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of magnetic performance deterioration, large internal stress, lattice distortion, etc., and achieve high magnetic permeability and excellent magnetic properties , to meet the effect of precision

Active Publication Date: 2015-02-25
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon and nitrogen are interstitial solid-solution elements, and sulfur is a substitutional solid-solution element, but their atomic radius is very different from that of iron atoms, which seriously distorts the lattice, causes large internal stress, and deteriorates magnetic properties.

Method used

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  • Manufacturing method of low-coercive force electromagnetic pure ion cold-rolled sheet
  • Manufacturing method of low-coercive force electromagnetic pure ion cold-rolled sheet
  • Manufacturing method of low-coercive force electromagnetic pure ion cold-rolled sheet

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Experimental program
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Effect test

Embodiment 1

[0037] The manufacturing method of the present embodiment comprises the following steps in sequence:

[0038] 1. Fabrication of slabs of optimized composition

[0039] a One-pass molten iron pretreatment, top-bottom double-blown converter smelting and vacuum refining (RH) to control the magnetically harmful C, N, O, S elements and their impurity content, after the molten steel is alloyed, add desulfurizer and rare earth for desulfurization . The amount of desulfurization agent limestone added is not less than 5kg / ton of steel, and the amount of rare earth ferrosilicon added is 1kg / ton of steel. The cycle time after adding desulfurizer and rare earth is ≥12min. The mass percent of the composition of molten steel is:

[0040] C=0.002%; Si=0.011%; M=0.15%; P=0.011%; S=0.002%;

[0041] Al=1.10%; [O] =0.0009ppm; [N]=0.0032ppm;

[0042] The rest is Fe and unavoidable impurities, and the total amount of electrolytic inclusions is 81ppm.

[0043] Vacuum refining method: the high...

Embodiment 2

[0063] What the present embodiment made was the electromagnetic pure iron cold-rolled thin steel plate, and the present embodiment was the following steps in sequence:

[0064] 1. Fabrication of slabs of optimized composition

[0065] a One-pass molten iron pretreatment, top-bottom double-blown converter smelting and vacuum refining (RH) to control the magnetically harmful C, N, O, S elements and their impurity content, after alloying molten steel, add desulfurizer and rare earth for desulfurization . The amount of desulfurizer limestone added is not less than 5kg / ton of steel (not less than 400kg / furnace), and the amount of rare earth ferrosilicon added is 1kg / ton of steel. The cycle time after adding desulfurizer and rare earth is ≥12min. The mass percent of the composition of molten steel is:

[0066] C=0.0025% Si=0.013 Mn=0. 16% P=0.012%

[0067] S=0.0015% Al=1.10% [O] =0.0010ppm [N]=0.0026ppm,

[0068] The rest is Fe and unavoidable impurities, electrolytic inclusion...

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Abstract

The invention relates to a manufacturing method of a low-coercive force electromagnetic pure ion cold-rolled sheet. The manufacturing method comprises the following steps in sequence: I. manufacturing of a sheet billet with optimal components, to be specific, a. during smelting, controlling C, N, O and S elements and impurity contents thereof, increasing the Al alloy content in steel, and reducing the S content in steel, and b. continuous casting of the sheet billet; II. hot rolling of steel coils, to be specific, a. the heating temperature of the sheet billet is 1160-1200 DEG C; b. hot rolling and finishing rolling at a high temperature, rolling the sheet billet into a hot-rolled steel sheet with the thickness of 1.5mm-7.0mm at 860-1000 DEG C, c. curling at a high temperature, wherein the curing temperature of the hot-rolled steel sheet is 700 DEG C to 800 DEG C; III. cold rolling and molding, wherein the total amount of deformation during cold rolling is 30%-40%; IV. annealing a single sheet by adopting a nitrogen protective cover type furnace, and carrying out heat preservation for 6-8 hours at 540-560 DEG C; and V. magnetism heat treatment, to be specific, carrying out magnetic heat treatment on a test sample for magnetism detection by adopting a vacuum or atmosphere protective anti-oxidation heat treatment furnace at 1000-1100 DEG C for no less than 2 hours of heat preservation. The low-coercive force of the low-coercive force electromagnetic pure ion cold-rolled sheet manufactured by the method is 11-20A / m.

Description

technical field [0001] The invention relates to a method for manufacturing a low-coercivity electromagnetic pure iron cold-rolled sheet. The low coercive force means that the coercive force of pure iron measured by GB / T3656 "Measurement Method of Pure Ferromagnetic Properties for Electricians" is less than 20A / m. Background technique [0002] Electromagnetic pure iron is an important soft magnetic material widely used in electromagnetic devices, magnetic shielding and other fields due to its excellent soft magnetic properties of low coercive force and high magnetic permeability. my country's electromagnetic pure iron grades are divided into DT4, DT4A, DT4E, DT4C, and the best level of coercivity is below 32A / m. Although my country's electromagnetic pure iron has excellent magnetic properties, there is a certain gap in coercive force and magnetic permeability compared with foreign special pure iron materials. Abroad does not disclose the manufacture method of special pure i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12C21D9/46C22C38/06
Inventor 苗晓王新宇陈泽民辛宪诚光红兵
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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