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Method for manufacturing electromagnetic pure iron

A technology of electromagnetic pure iron and manufacturing method, which is applied in the field of electromagnetic pure iron manufacturing, and can solve problems such as shrinkage cavity, poor airtightness of electronic tube parts, and low pass rate

Inactive Publication Date: 2014-05-14
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electromagnetic pure iron produced by the conventional process has problems such as high inclusion content, loose structure, shrinkage cavity, etc., and the airtightness of the manufactured electron tube parts is poor, and the qualified rate is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The embodiment of this electromagnetic pure iron manufacturing method comprises the following steps in sequence:

[0033] Ⅰ steelmaking

[0034] After pretreatment, desulfurization and slag removal, the molten iron enters the converter for smelting, and then undergoes RH vacuum refining. The RH vacuum refining process carries out decarburization and deoxidation respectively, and adjusts the molten steel composition. After the RH vacuum refining is completed, the mass percentage of the molten steel composition is as follows:

[0035] C: 0.003%, Si: 0.01%, Mn: 0.13%, P: 0.009%, S: 0.008%, Al: 0.60%, and the rest is Fe and unavoidable impurities.

[0036] Ⅱ mold casting

[0037] After refining, it is released from the furnace and cast into a round steel ingot with a weight of 5.8t / piece.

[0038] Ⅲ forging

[0039] The steel ingot is forged into an electrode blank with a diameter of Φ550mm, and the oxide layer on the surface of the electrode blank is removed by pi...

Embodiment 2

[0052] The embodiment of this electromagnetic pure iron manufacturing method comprises the following steps in order:

[0053] Ⅰ steelmaking

[0054] After pretreatment, desulfurization and slag removal, the molten iron enters the converter for smelting, and then undergoes RH vacuum refining. The RH vacuum refining process carries out decarburization and deoxidation respectively, and adjusts the molten steel composition. After the RH vacuum refining is completed, the mass percentage of the molten steel composition is as follows:

[0055] C: 0.005%, Si: 0.03%, Mn: 0.08%, P: 0.014%, S: 0.005%, Al: 0.45%, and the rest is Fe and unavoidable impurities.

[0056] Ⅱ mold casting

[0057] After refining, it is released from the furnace and cast into a round steel ingot with a weight of 5.8t / piece.

[0058] Ⅲ forging

[0059] The steel ingot is forged into an electrode blank with a diameter of Φ550mm, and the oxide layer on the surface of the electrode blank is removed by pickli...

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Abstract

The invention relates to a method for manufacturing electromagnetic pure iron. The method orderly comprises the following steps: (I) steelmaking, namely entering molten iron into a converter to smelt after desulfuration pretreatment and drossing, wherein the mass percent of ingredients of the molten iron achieve the following requirements: no more than 0.005% of C, no more than 0.03% of Si, 0.08-0.13% of Mn, 0.10-0.60% of Al, no more than 0.015% of P, no more than 0.008% of S, and the balance of Fe and inevitable impurities after the molten iron smelted by the converter is subjected to RH vacuum refining; (II) die casting, namely discharging and casting into a steel ingot; (III) forging, namely forging and processing the steel ingot into an electrode billet, and removing a surface oxide layer on the electrode billet in a pickling manner; (IV) electroslag remelting, namely charging slag charge into an electroslag furnace, inserting into the electrode billet and electrifying under protection of an inert glass to carry out electroslag remelting, so as to obtain an electroslag ingot; (V) hot rolling, namely processing the electroslag ingot into an electromagnetic pure iron product in a hot rolling manner. The electromagnetic pure iron manufactured by using the method for manufacturing the electromagnetic pure iron is high in purity and low in coercive force.

Description

technical field [0001] The invention relates to a manufacturing method of electromagnetic pure iron. Background technique [0002] Electromagnetic pure iron has the characteristics of low coercive force, high magnetic permeability, stable magnetic properties, excellent processing performance, and wide application. It is an indispensable functional material in the science and technology industry. [0003] The existing manufacturing process of electromagnetic pure iron is "hot metal pretreatment→converter→refining→continuous casting (or die casting)→rolling". For ordinary electronic components, this process can meet the product's requirements for the quality of electromagnetic pure iron. [0004] Electromagnetic pure iron used to manufacture magnetrons, cesium beam tubes and other electronic tube parts, in addition to having a low coercive force, also has extremely strict requirements on the content of inclusions and the compactness of the steel to meet the airtightness of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C33/04C22B9/18C21D8/12
Inventor 陈泽民赵昱臻苗晓
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD