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Method for preparing high magnetic induction oriented silicon steel

A technology of high magnetic induction orientation and silicon steel, which is applied in the field of iron and steel smelting, can solve problems such as uneven distribution of AlN, and achieve the effect of improving the pass rate of magnetic properties, increasing the magnetic induction value, and improving the pass rate of performance

Inactive Publication Date: 2020-02-14
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the slab is heated at 1180-1220°C, AlN is completely dissolved, but because it is in the α+γ two-phase region, the distribution of AlN is not uniform

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for preparing high magnetic induction oriented silicon steel. The smelting process is: smelting—continuous casting—slab heating and hot rolling—normalized pickling—cold rolling—decarburization annealing and nitriding treatment and MgO coating—high temperature annealing—hot rolling Stretch leveling annealing and insulating coating—shearing and packaging for storage; of which:

[0042] (1) Smelting process

[0043] The molten iron is smelted through a converter and refined to obtain the molten steel with the composition in Table 1, the rest is iron, and the impurity content is required to be <0.0050%.

[0044] Table 1: Molten Steel Composition (wt%)

[0045] C Si mn P S als N sn Cu Cr Sb 0.05 3.1 0.20 0.040 0.006 0.024 0.004 0.06 0.04 0.10 0.05

[0046] (2) Continuous casting process

[0047] The molten steel is poured when the degree of superheat is less than 50°C, the casting speed is 0.8-1.0m / min, and the thickness ...

Embodiment 2

[0061] A method for preparing high magnetic induction oriented silicon steel. The smelting process is: smelting—continuous casting—slab heating and hot rolling—normalized pickling—cold rolling—decarburization annealing and nitriding treatment and MgO coating—high temperature annealing—hot rolling Stretch leveling annealing and insulating coating—shearing and packaging for storage; of which:

[0062] (1) Smelting process

[0063] After smelting and refining by converter and RH, the molten steel with the composition in Table 2 is obtained, the balance is iron, and the impurity content is required to be <0.0050%.

[0064] Table 2: Molten Steel Composition (wt%)

[0065] C Si mn P S als N sn Cu Cr Sb 0.055 3.2 0.18 0.030 0.005 0.026 0.005 0.07 0.06 0.12 0.04

[0066] (2) Continuous casting process

[0067] The molten steel is poured when the degree of superheat is less than 50°C, the casting speed is 0.8-1.0m / min, and the thickness of t...

Embodiment 3

[0081] A method for preparing high magnetic induction oriented silicon steel. The smelting process is: smelting—continuous casting—slab heating and hot rolling—normalized pickling—cold rolling—decarburization annealing and nitriding treatment and MgO coating—high temperature annealing—hot rolling Stretch leveling annealing and insulating coating—shearing and packaging for storage; of which:

[0082] (1) Smelting process

[0083] After smelting and refining by converter and RH, the molten steel with the composition in Table 3 is obtained, the balance is iron, and the impurity content is required to be <0.0050%.

[0084] Table 3: Molten Steel Composition (wt%)

[0085] C Si mn P S als N sn Cu Cr Sb 0.053 3.15 0.19 0.035 0.0045 0.027 0.0049 0.065 0.07 0.11 0.035

[0086] (2) Continuous casting process

[0087] The molten steel is poured when the superheat is less than 50°C, the casting speed is 0.8-1.0m / min, and the thickness of the ca...

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Abstract

The invention relates to a method for preparing high magnetic induction oriented silicon steel. The method for preparing the high magnetic induction oriented silicon steel includes the steps: adding Sb element in ingredients of silicon steel, meanwhile adding a small amount of Cu, setting the drawing velocity at 0.8-1.0m / min, and setting the thickness of a casting blank at 200-250min; setting heating temperature of the casting blank at 1180-1220 DEG C, and setting heating time at 180-240min; performing the normalizing process by adopting two-step normalizing; performing the nitriding treatmentprocess by adopting NH3 nitriding in a mixture containing 75% of H2 and 25% of N2; performing high temperature annealing, wherein first raising temperature to 600-650 DEG C at the velocity of 50-100DEG C / h under N2 atmosphere, then keeping the temperature at 600-650 DEG C for 5-10h under protective atmosphere containing 75% of H2 and 25% of N2 by volume fraction, and then raising the temperatureto 1200 DEG C at the velocity of 15-20 DEG C; and after coating the silicon steel with an insulating layer, drying the insulating layer under the temperature of 500 DEG C, and performing annealing after levelling the silicon steel by stretching the silicon steel at the elongation of 0.25%-0.75% under the temperature about 800-900 DEG C. The method for preparing the high magnetic induction oriented silicon steel improves induction value of the oriented silicon steel, and improves performance qualification rate of the oriented silicon steel by 15-25%.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a method for preparing high magnetic induction oriented silicon steel. Background technique [0002] Oriented silicon steel with a silicon content of 3% is an indispensable and important metal functional material in the electric power, electronics and military industries, and is also a high value-added product that can be mass-produced by iron and steel enterprises. The production process of grain-oriented silicon steel is complicated, the parameter window is narrow, the process is long, the technical content is high, and there are many influencing factors. It is known as the "handicraft" in steel products. The production process of grain-oriented silicon steel is as follows: [0003] Hot metal pretreatment→smelting→external refining→continuous casting→slab heating and hot rolling→normalized pickling→cold rolling→decarburization annealing and nitriding treatment and MgO co...

Claims

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Application Information

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IPC IPC(8): C21D8/12C22C33/04C22C38/00C22C38/04C22C38/06C22C38/20C22C38/34C22C38/60
CPCC21D8/1222C21D8/1233C21D8/1255C21D8/1283C22C33/04C22C38/001C22C38/008C22C38/04C22C38/06C22C38/20C22C38/34C22C38/60
Inventor 张海利蒋奇武贾志伟王项龙庞树芳张静李莉
Owner ANGANG STEEL CO LTD
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