Method for manufacturing high magnetic induction grain-oriented silicon steel through short-process medium and thin slab

A high magnetic induction orientation, medium-thin slab technology, applied in the field of iron and steel metallurgy, can solve the problems of increased cost, difficulty in obtaining, and surface defects of slabs, so as to improve production efficiency and yield, increase continuous casting cooling speed, comprehensive Effect of Yield Improvement

Active Publication Date: 2015-06-24
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the production method of the secondary cold rolling method is stable, it is difficult to obtain high magnetic induction, and because of the long production process, it is difficult to reach a high level of yield; the conventional primary cold rolling method is due to the addition of other alloy elements, causing The difficulty of smelting increases, the cost increases, and it is not conducive to saving energy
When thin slabs are used, due to the use of funnel-shaped crystallizers and high casting speeds, defects such as slag rolling and slag inclusions are prone to appear on the surface of the slab, which affects the magnetic properties of the product
The production of thick slabs needs to increase the heating temperature of the slabs, while the production of thin slabs is prone to surface defects

Method used

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  • Method for manufacturing high magnetic induction grain-oriented silicon steel through short-process medium and thin slab
  • Method for manufacturing high magnetic induction grain-oriented silicon steel through short-process medium and thin slab
  • Method for manufacturing high magnetic induction grain-oriented silicon steel through short-process medium and thin slab

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1.1 Composition

[0031] A can of steel is smelted, and its chemical composition is shown in Table 2.

[0032] Table 2 Chemical Composition (wt%)

[0033] the element

C

Si

mn

P

S

als

N

content

0.03

2.9

0.08

0.005

0.02

0.01

0.006

[0034] 1.2 Process

[0035] The LF furnace is used for refining outside the furnace, the medium and thin slabs are continuously cast and rolled, the casting speed is 1.6m / min, and the thickness of the continuous casting slab is 120mm. The furnace loading temperature of the slab is 400°C, the heating temperature is 1100°C, the first roughing mill is rolled for 3 passes, the second roughing mill is rolled for 1 pass, the thickness of the intermediate slab is 35mm, and the finishing rolling temperature is 1080°C, the thickness of the hot-rolled sheet is 2.0mm, and the coiling temperature is 500°C. Select 2 coils of steel (1#, 2#), the first stage of normalization i...

Embodiment 2

[0069] 4.1 Composition

[0070] The chemical composition is shown in Table 9.

[0071] Table 9 chemical composition (wt%)

[0072] the element

C

Si

mn

P

S

als

N

content

0.05

3.4

0.20

0.018

0.010

0.02

0.010

[0073] 4.2 Process

[0074] Using LF refining outside the furnace, the medium and thin slab continuous casting and rolling process is implemented, the continuous casting casting speed is 2.0m / min, the continuous casting slab thickness is 150mm, the slab charging temperature is 350°C, and the hot rolling heating temperature is 1230°C. The first rough rolling mill is rolled for 3 passes, the second rough rolling mill is rolled for 1 pass, the thickness of the intermediate billet is 30mm, the temperature of entering and finishing rolling is 1060°C, and the thickness of the hot-rolled plate is 2.5mm; select 2 coils of raw materials (5#, 6#), the first stage of the normalization process is heated ...

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Abstract

The invention discloses a method for manufacturing high magnetic induction grain-oriented silicon steel through a short-process medium and thin slab. The method comprises hot metal pretreatment, smelting, LF furnace external refining, medium and thin slab continuous casting and rolling, normalizing acid pickling, cold rolling, decarburizing annealing and MgO coating, high-temperature annealing, hot stretching leveling and insulation layer coating and rewinding packaging. The steel comprises the following components according to the weight percent ratio: 0.01 to 0.1 of C, 2.5 to 3.5 of Si, 0.05 to 0.20 of Mn, 0.005 to 0.02 of P, 0.005 to 0.03 of S, 0.005 to 0.02 of Als, 0.006 to 0.10 of N, the balanced of Fe and inevitable impurities. The process overall finished product yield after hot rolling is improved by more than 5 percent, magnetic induction B8 is improved to be more than 1.88T, and the iron loss P1.7 is reduced to below 1.20W / kg.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to a method for preparing high magnetic induction oriented silicon steel from a thin slab in a short process. Background technique [0002] Oriented silicon steel is an electrical steel whose crystal grains are easily magnetized parallel to the rolling direction and contains about 3% silicon. It is called a "artwork" in steel products because of its high technical content and complex process. It is used in electric power, One of the important soft magnetic alloys in the electronics industry. [0003] The general preparation method of ordinary magnetic induction oriented silicon steel (GO steel) is the double cold rolling method. The composition is designed with five elements that are easy to control in steelmaking, and no other alloy elements are added. The process flow is: smelting→continuous casting→hot rolling →Normalized pickling→Primary cold rolling→Intermediate annealin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C22C38/06
Inventor 蒋奇武游清雷金文旭张海利付勇军张静庞树芳贾志伟王晓达苏皓璐李莉李雪彦
Owner ANGANG STEEL CO LTD
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