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Steel for internal magnetic shield and manufacturing method thereof

A manufacturing method and magnetic shielding technology, applied in the field of steel for internal magnetic shielding and making steel for internal magnetic shielding of picture tube inner parts, can solve the problems of adverse effects of material magnetic properties, high production cost, low hardness, etc., and achieve good Effects of surface blackening and magnetic properties, good shape stability, and low production cost

Active Publication Date: 2009-01-28
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese Patent Publication CN1196758A discloses a "magnetic shielding material, its manufacturing method and a color picture tube assembled with the material", which has added 0.5 to 2.5 wt% of silicon and has certain handling strength and magnetic properties, but The addition of a large amount of silicon has an adverse effect on the magnetic properties of the material, and will damage the adhesion of the blackened film. Therefore, the addition of silicon to improve the strength of the material and the strengthening of the magnetic properties have little practical value in the application of the internal magnetic shielding of the picture tube.
[0004] In order to solve the problems of low hardness, poor shape stability, and high production cost of the existing internal magnetic shielding materials, the inventors have developed a steel for internal magnetic shielding used to make the inner parts of picture tubes through research.

Method used

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  • Steel for internal magnetic shield and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The molten steel is smelted according to the following chemical composition: C: 0.001wt%, Si: 0.011wt%, Mn: 0.30wt%, P: 0.007wt%, S: 0.006wt%, Al: 0.006wt%, N: 0.0027wt%, and The amount is Fe and unavoidable impurities.

[0035] The molten steel smelted in the converter according to the above ratio is refined after the furnace, and then hot-rolled. The heating temperature of the hot rolling is 1150°C, the final rolling temperature is 880°C, and the coiling temperature is 680°C. After pickling, it is cold-rolled. The rolling deformation is 78%, and then annealed in a bell furnace at 620°C for 15 hours, and then undergoes secondary cold rolling with a secondary cold rolling deformation rate of 30%, and finally finished into finished coils.

Embodiment 2

[0037] The molten steel is smelted according to the following chemical composition: C: 0.002wt%, Si: 0.010wt%, Mn: 0.45wt%, P: 0.013wt%, S: 0.004wt%, Al: 0.003wt%, N: 0.0021wt%, and The amount is Fe and unavoidable impurities.

[0038] The embodiment is the same as in Example 1, wherein the hot rolling heating temperature is 1130°C, the finishing rolling temperature is 930°C, the coiling temperature is 620°C, the first cold rolling deformation is 82%, the bell annealing temperature is 690°C, and the annealing time is 18 hours. The secondary cold rolling deformation rate is 15%.

Embodiment 3

[0040] The molten steel is smelted according to the following chemical composition: C: 0.004wt%, Si: 0.005wt%, Mn: 0.21wt%, P: 0.009wt%, S: 0.004wt%, Al: 0.008wt%, N: 0.0023wt%, and The amount is Fe and unavoidable impurities.

[0041] The implementation is the same as in Example 1, wherein the hot rolling heating temperature is 1200°C, the finishing rolling temperature is 890°C, the coiling temperature is 730°C, the first cold rolling deformation is 90%, the bell annealing temperature is 730°C, and the annealing time is 13 hours , The secondary cold rolling deformation rate is 40%.

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Abstract

The invention provides an inter-magnetic shielded steel and a preparation method thereof. The inter-magnetic shielded steel consists of the following chemical compositions: C is less than or equal to 0.005 weight percent, Si is less than or equal to 0.05 weight percent, Mn is 0.10 to 0.50 weight percent, P is less than or equal to 0.02 weight percent, S is less than or equal to 0.015 weight percent, Al is less than or equal to 0.030 weight percent, N is less than or equal to 0.005 weight percent, and the rest are Fe and inevitable impurities. The inter-magnetic shielded steel is pretreated by molten iron, smelted in a converter, refined after processed in the furnace, hot rolled, cleaned by acid, cold rolled, annealed in a bell type furnace, cold rolled again and finally finished into end-product coils. After stamped, the inter-magnetic shielded steel of the invention has excellent shape stability, good surface darkening performance and magnetic performance, and can be used for internal magnetic shielding of image tubes which carry out oxide treatment after stamped.

Description

technical field [0001] The invention relates to the field of steel materials. Specifically, the invention relates to steel for internal magnetic shielding. More specifically, the invention relates to a steel for internal magnetic shielding used for making inner parts of picture tubes. Background technique [0002] Since the weak magnetic field of the earth and the strong magnetic field generated by external electrical appliances will affect the electron beam of the picture tube, the electron beam will be shifted and the normal operation of the picture tube will be affected. Therefore, magnetic shielding materials can be used to contain objects inside to reduce The interference of the external magnetic field or the influence of the external magnetic field. Because the magnetic shielding materials all work under the DC magnetic field, it is required that the material should have a large maximum magnetic induction intensity (Bm) under the specified DC magnetic field, and the st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/06B21B37/00C21D1/26C21D9/54C21D8/12
CPCY02P10/20
Inventor 班必俊
Owner BAOSHAN IRON & STEEL CO LTD
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