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Thin-gauge, ultra-low iron loss, low-noise and high-magnetic induction oriented silicon steel sheet and production method thereof

A technology of oriented silicon steel and silicon steel sheet, which is applied in the field of iron core materials for power transmission and distribution transformers in the power industry

Active Publication Date: 2014-01-29
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Baosteel can stably mass-produce 0.23mm thick Hi-B oriented silicon steel with low temperature heating, but there is no 0.18mm thick high magnetic induction oriented silicon steel product for transformers

Method used

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  • Thin-gauge, ultra-low iron loss, low-noise and high-magnetic induction oriented silicon steel sheet and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Silicon steel slabs were smelted in a 500Kg vacuum melting furnace, and the casting components were shown in Table 1.

[0043] Table 1 Chemical composition (wt%) of billet, the balance is Fe

[0044] C

[0045] Heat the cast slab to 1150-1170°C, keep it warm for 2.5 hours, hot-roll it to 3mm, and curl it with a final reduction of 85%, then perform normalization treatment, heat it at 900-1100°C for 1-5 minutes for annealing, and The final forming cold rolling of the plate is carried out on the rolling mill, the reduction is 90%, and the thickness is controlled at 0.18mm. Then decarburization and nitriding are carried out, water vapor is introduced during decarburization, the final C content is controlled at 450ppm, and NH is introduced during nitriding 3 , carried out at 800°C and coated with glass film, and finally annealed at 1110-1120°C at high temperature, under the protection of pure nitrogen, raised to 450°C for 3 hours, removed water vapor and isolated ...

Embodiment 2

[0051] Silicon steel slabs were smelted in a 500Kg vacuum melting furnace, and the casting components were shown in Table 3.

[0052] Table 3 Chemical composition (wt%) of billet, the balance is Fe

[0053] C

[0054] Heat the cast slab to 1160-1180°C, heat it for 3 hours and then rough roll it for 2 passes, then finish rolling it for 3 passes. The final reduction is 80%, hot rolling to 3mm, crimping, and then normalizing treatment. Heat preservation at 900-1000°C for 1-5 minutes for annealing, and final cold-rolling of the plate on a cold rolling mill, with the thickness controlled at 0.18mm. Subsequent decarburization is carried out to control the final C content at 300ppm, and NH is introduced during nitriding 3 , carried out at 800°C, and coated with glass film; finally, the high-temperature annealing was raised to 500°C for 3.5 hours under the protection of pure nitrogen, to remove water vapor and isolate the air; under the condition of nitrogen:hydrogen ratio ...

Embodiment 3

[0060] Silicon steel slabs were smelted in a 500Kg vacuum melting furnace, and the casting composition was shown in Table 5.

[0061] Table 5 Chemical composition (wt%) of steel billet, the balance is Fe

[0062] C

[0063] Heat the billet to 1200-1240°C, keep it warm for 2.3 hours, hot-roll it to 3mm, crimp it, then carry out normalization treatment, heat it at 950-1050°C for 1-5 minutes for annealing, and carry out the final forming of the plate on a cold rolling mill Cold rolling, the thickness is controlled at 0.18mm. Water vapor is then introduced during decarburization to control the final C content at 300ppm, and NH is introduced during nitriding 3 , carried out at 800°C, and coated with glass film, and finally under the protection of pure nitrogen, raised to 400°C for 2 hours to remove water vapor and isolate the air; under the condition of nitrogen:hydrogen ratio of 1:3, the heating rate was 40°C Raise the temperature of the furnace to 1120-1150°C per hour...

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Abstract

The invention discloses a production technology of a thin-gauge, ultra-low iron loss, low-noise and high-magnetic induction oriented silicon steel sheet. The oriented silicon steel sheet comprises the following components in percentage by weight: 0.003-0.05 percent of C, 4.1-9 percent of Si, 0.05-0.5 percent of Mn, 0.02-0.06 percent of Al, 0.01-1 percent of Sn, 0.05-0.1 percent of Mo, 0.2-1 percent of Cu, 0.003-0.02 percent of N, 0.002-0.06 percent of P, 0.001-0.008 percent of S and the balance of iron and other inevitable impurities. The high-magnetic induction oriented silicon steel sheet which is produced through hot rolling, cold rolling and annealing processes and the like has the superior performances such as ultra-low iron loss, high flux density, low magnetostriction coefficient and small thickness, has the advantages of simple process, stable texture and capabilities of greatly saving the materials and saving the resources while guaranteeing that the capacity of a transformer is unchanged, and is the best candidate material for manufacturing high-grade power transmission and distribution transformer cores at present.

Description

【Technical field】 [0001] The invention belongs to the field of materials for iron cores of power transmission and distribution transformers in the electric power industry, and specifically relates to an oriented silicon steel sheet with thin specifications, ultra-low iron loss, low noise and high magnetic induction and a preparation method thereof. 【Background technique】 [0002] Cold-rolled electrical silicon steel sheets are mainly used in the electrical industry, and have always been a steel product that is seriously in short supply in my country, and its consumption is roughly proportional to the power generation. Cold-rolled grain-oriented electrical silicon steel with a silicon content of ~3% is an important soft magnetic material, mainly used to manufacture iron cores for transformers, and is widely used in electric power and telecommunications. The electricity loss caused by the loss of electrical silicon steel accounts for 2.5% to 4.5% of the annual power generation...

Claims

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Application Information

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IPC IPC(8): C22C38/16C21D8/12
Inventor 杨富尧马光陈新程灵韩钰聂京凯祝志祥
Owner STATE GRID CORP OF CHINA
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