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A Method for Improving Surface Quality of Low Temperature Nitriding Oriented Silicon Steel

A technology for oriented silicon steel and surface quality, applied in the direction of solid-state diffusion coating, coating, metal material coating process, etc., can solve the problems of insufficient floating of inclusions, affecting surface quality, containing inclusions, etc., and achieve stable magnetic properties , improve the surface quality, reduce the effects of inclusions

Active Publication Date: 2020-09-01
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Compared with the high-temperature slab heating method, the nitriding grain-oriented silicon steel produced by the low-temperature slab heating method has a greatly increased aluminum content, and it is easy to produce Al in the molten steel during steelmaking and continuous casting. 2 o 3 Dominated inclusions due to Al 2 o 3 If the inclusions do not float up enough during the smelting process, the slab will contain inclusions, and when the slab is rolled into a thin strip, it will cause surface protrusions and affect the surface quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The method for improving the surface quality of low-temperature nitriding grain-oriented silicon steel comprises the following steps:

[0033] 1. The composition of high magnetic induction oriented silicon steel is calculated by weight percentage:

[0034] C 0.05%; Si 3.0%; Mn 0.15%; P≤0.009%; S 0.05%; Als 0.03%; N 0.007%; Cu 0.15%; Sn 0.075%;

[0035] 2. Converter smelting

[0036] After normal blowing, argon blowing at the bottom is used to stir before tapping, and the amount of argon blowing is 6m 3 / h, the stirring time is 1min.

[0037] 3. RH refining

[0038] The thickness of mold slag for RH refining molten steel is 65mm, the starting temperature of RH refining molten steel is 1610°C, and the working end temperature is 1550°C.

[0039] 4. Continuous casting

[0040] The molten steel is poured into a slab of 230mm when the degree of superheat is less than 30°C, and the casting speed is 0.70m / min.

[0041] 5. Hot rolling process

[0042] The slab is heated t...

Embodiment 2

[0055] The method for improving the surface quality of low-temperature nitriding grain-oriented silicon steel comprises the following steps:

[0056] 1. The composition of high magnetic induction oriented silicon steel is calculated by weight percentage:

[0057] C 0.05%; Si 3.0%; Mn 0.15%; P≤0.009%; S 0.05%; Als 0.03%; N 0.007%; Cu 0.15%; Sn 0.075%;

[0058] 2. Converter smelting

[0059] After normal blowing, argon blowing at the bottom is used to stir before tapping, and the amount of argon blowing is 15m 3 / h, the stirring time is 3min.

[0060] 3. RH refining

[0061] The thickness of mold slag for RH refining molten steel is 65mm, the starting temperature of RH refining molten steel is 1610°C, and the working end temperature is 1565°C.

[0062] 4. Continuous casting

[0063] The molten steel is poured into a thick slab of 230mm when the degree of superheat is less than 30°C, and the casting speed is 0.80m / min.

[0064] 5. Hot rolling process

[0065] The slab is h...

Embodiment 3

[0078] The method for improving the surface quality of low-temperature nitriding grain-oriented silicon steel comprises the following steps:

[0079] 1. The composition of high magnetic induction oriented silicon steel is calculated by weight percentage:

[0080] C 0.05%; Si 3.0%; Mn 0.15%; P≤0.009%; S 0.05%; Als 0.03%; N 0.007%; Cu 0.15%; Sn 0.075%;

[0081] 2. Converter smelting

[0082] After normal blowing, argon blowing at the bottom is used to stir before tapping, and the amount of argon blowing is 15m 3 / h, the stirring time is 2min.

[0083] 3. RH refining

[0084] The thickness of mold slag for RH refining molten steel is 65mm, the starting temperature of RH refining molten steel is 1610°C, and the working end temperature is 1560°C.

[0085] 4. Continuous casting

[0086] The molten steel is poured into a thick slab of 230mm when the degree of superheat is less than 30°C, and the casting speed is 0.75m / min.

[0087] 5. Hot rolling process

[0088] The slab is h...

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PUM

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Abstract

The invention relates to a method for improving the surface quality of low-temperature nitriding oriented silicon steel. A nitriding oriented silicon steel thin slab comprising the following components in percentage by weight is continuously cast: 0.04-0.07% of C, 2.5-3.5% of Si, 0.1-0.20% of Mn, P not more than 0.01%, 0.003-0.01% of S, 0.025-0.035% of Als, 0.005-0.009% of N, 0.1-0.2% of Cu, 0.05-0.10% of Sn, and the balance of iron and few impurities. The method has the following advantages: the method for improving the surface quality of the low-temperature nitriding oriented silicon steel can reduce generation of inclusions; through control of the number of cast blank inclusions, the surface quality of the nitriding oriented silicon steel can be obviously improved; and the inclusions are urged to fully float up in the smelting process, so that the cleanness of molten steel is improved, uniform structure of the oriented silicon steel is guaranteed, and magnetic performance is stable.

Description

technical field [0001] The invention belongs to the field of oriented silicon steel, in particular to a method for improving the surface quality of low-temperature nitriding oriented silicon steel. Background technique [0002] Oriented silicon steel is used to make iron cores of transformers, electromagnetic switches and other devices, and plays an important role in the fields of electric power, electronics, and military industry. In the context of global energy shortages and increasingly severe environmental problems, it has gradually become a priority to replace the inherent inhibitors of traditional high-temperature slab heating (1200-1300°C) with low-temperature slab heating (1100-1200°C) for the preparation of acquired nitrided grain-oriented silicon steel. trend. [0003] Since the inherent inhibitors MnS and AlN cannot be fully dissolved in the slab under low-temperature heating, the secondary recrystallization is not perfect and the magnetic properties are poor. F...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/26C22C38/02C22C38/04C22C38/06C22C38/16C21D8/12C21D1/74C21D1/26C21D3/04
CPCC21D1/26C21D1/74C21D3/04C21D8/1222C21D8/1255C22C38/001C22C38/008C22C38/02C22C38/04C22C38/06C22C38/16C23C8/26
Inventor 蒋奇武张海利杨忠杰付勇军贾志伟张静庞树芳王晓达李莉李雪彦
Owner ANGANG STEEL CO LTD