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Low-temperature and high-magnetic-strength oriented silicon steel production process

A high magnetic induction orientation and production process technology, applied in the field of steelmaking, can solve the problems of high energy consumption of transformers, low component hit rate, high nitrogen content, etc., and achieve high production efficiency, low production cost and reduced production cost.

Inactive Publication Date: 2016-05-11
JIANGYOU FENGWEI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The common cold-rolled grain-oriented silicon steel (CGO steel) currently produced in the market is restricted by the production process, its magnetic induction intensity is 1.82~1.85A / m; High energy consumption and high noise; the main technical difficulties in the production technology of low temperature and high magnetic induction grain oriented silicon steel are: (1) The nitrogen content is high and the range is extremely narrow and difficult to control, resulting in a low component hit rate

Method used

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  • Low-temperature and high-magnetic-strength oriented silicon steel production process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The production process of low temperature high magnetic induction grain oriented silicon steel includes the following steps:

[0058] A. Ironmaking treatment: put iron ore or sinter, lime or limestone and metallurgical coke into blast furnace for reduction smelting to produce molten iron.

[0059] Fe 3 o 4 +C→Fe+CO 2 Fe 2 o 3 +C→Fe+CO 2

[0060] B. Steelmaking process

[0061] b1, adding molten iron into an oxygen top-bottom composite oxygen-blowing converter, oxidizing and removing Si, Mn, S, P, C, Ni, Cr and Cu in the molten iron to obtain molten steel;

[0062] Si, (Mn, S, P, C)+O 2 → SiO 2 +(MnO,SO 2 ,P 2 o 5 , CO 2 )

[0063] b2, when the C content in molten steel is 0.1%, add lime slagging of 1.5% of the total amount of molten steel to molten steel, remove metal oxides, non-metallic oxides and S, P in molten steel, and make S, P content 0.01%;

[0064] SiO 2 (MnO, FeO, S, P)+CaO→CaO·SiO 3 ((MnO SiO 3 +FeO·SiO 3 )+CaS+Ca PO 4 )

[0065] b3. Whe...

Embodiment 2

[0080] The production process of low temperature high magnetic induction grain oriented silicon steel includes the following steps:

[0081] A. Ironmaking treatment: put iron ore or sinter, lime or limestone and metallurgical coke into blast furnace for reduction smelting to produce molten iron.

[0082] Fe 3 o 4 +C→Fe+CO 2 Fe 2 o 3 +C→Fe+CO 2

[0083] B. Steelmaking process

[0084] b1, adding molten iron into an oxygen top-bottom composite oxygen-blowing converter, oxidizing and removing Si, Mn, S, P, C, Ni, Cr and Cu in the molten iron to obtain molten steel;

[0085] Si, (Mn, S, P, C)+O 2 → SiO 2 +(MnO,SO 2 ,P 2 o 5 , CO 2 )

[0086] b2. When the C content in the molten steel is 0.8%, add 1.83% of the total amount of lime in the molten steel to make slag, remove metal oxides, non-metallic oxides and S and P in the molten steel, and make the S and P content 0.008%.

[0087] SiO 2 (MnO, FeO, S, P)+CaO→CaO·SiO 3 ((MnO SiO 3 +FeO·SiO 3 )+CaS+Ca PO 4 )

[0...

Embodiment 3

[0103] The production process of low temperature high magnetic induction grain oriented silicon steel includes the following steps:

[0104] A. Ironmaking treatment: put iron ore or sinter, lime or limestone and metallurgical coke into blast furnace for reduction smelting to produce molten iron;

[0105] Fe 3 o 4 +C→Fe+CO 2 Fe 2 o 3 +C→Fe+CO 2

[0106] When selecting iron ore, it is best to select iron ore with low content of harmful elements such as S and P, and metallurgical coke is preferably high-strength and low-ash.

[0107] B. Steelmaking process

[0108] b1. Put molten iron into an oxygen top-bottom combined oxygen blowing converter, oxidize and remove Si, Mn, S, P, C, Ni, Cr and Cu in the molten iron to obtain molten steel.

[0109] Si, (Mn, S, P, C)+O 2 → SiO 2 +(MnO,SO 2 ,P 2 o 5 , CO 2 )

[0110] b2. When the C content in molten steel is 0.05%, add lime with 2.25% of the total amount of molten steel to the molten steel to make slag, remove metal oxid...

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Abstract

The invention discloses a low-temperature and high-magnetic-strength oriented silicon steel production process. The production process comprises the technological flows of iron smelting-steel smelting-blank casting-hot rolling of silicon steel strips-normalizing treatment-acid washing-trimming of the steel strips-cold rolling-decarburization-nitriding-magnesium oxide coating-high-temperature heat treatment of a cover furnace-stretching-finishing-packing and marking-warehousing of finished products. The low-temperature and high-magnetic-strength oriented silicon steel production process is adopted to produce oriented silicon steel; the component content ratio reaches about 95%; a traditional production process adopts MnS as a main inhibitor; a main inhibitor A1N of the production process has a dissolving temperature of 1250 DEG C; the hot-rolling heating temperature is reduced; and the carbon content of silicon steel is directly once reduced from 400 PPm to 30 ppm through decarburization and annealing to reach the international advanced level.

Description

technical field [0001] The invention relates to steelmaking technology in the field of metallurgy, in particular to a production process for low-temperature high-magnetic-induction oriented silicon steel. Background technique [0002] Low temperature and high magnetic induction cold-rolled grain-oriented silicon steel is a new magnetic material for the production of S13 and above transformers with low energy consumption and low noise. The production process of low-temperature high-magnetic cold-rolled grain-oriented silicon steel is quite complicated, the production cost is high, the technical content is extremely high, the production is extremely difficult, and the added value of the product is high. Its market price can reach about 9 times that of ordinary steel. Due to the restriction of high-quality, precise and sharp production technology, only a dozen steel mills in the world can produce this product; in China, due to the introduction of Japanese patented technology by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21D8/12C21D1/74
CPCC21D1/74C21D8/1222C21D8/1233C21D8/1238C21D8/1255C21D8/1261C21D8/1277C21D8/1283C21D2201/05C21D2261/00C22C33/04
Inventor 周栋承
Owner JIANGYOU FENGWEI NEW MATERIAL
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