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Thin slab process high magnetic induction oriented electrical steel sheet and its manufacturing method

A high magnetic induction orientation, electrical steel sheet technology, applied in the improvement of process efficiency, other manufacturing equipment/tools, manufacturing tools, etc., can solve the problems of high annealing temperature, high heating temperature, and many process links, and achieve final high temperature annealing. The effect of low temperature, low heating temperature and reasonable chemical composition

Inactive Publication Date: 2008-11-26
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main method used by Nippon Steel and Sumitomo Metals to reduce the heating temperature of slabs is to use AlN as the main inhibitor and carry out nitriding treatment. There are many process links, complicated technology and high difficulty
South Korea's Pohang Iron and Steel Company uses AlN as the main inhibitor, Cu 2 S and MnS are auxiliary inhibitors with complex composition, high heating temperature and high final annealing temperature

Method used

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  • Thin slab process high magnetic induction oriented electrical steel sheet and its manufacturing method
  • Thin slab process high magnetic induction oriented electrical steel sheet and its manufacturing method
  • Thin slab process high magnetic induction oriented electrical steel sheet and its manufacturing method

Examples

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example 1

[0022] Example 1 A kind of manufacturing method of thin slab process high magnetic induction oriented electrical steel sheet

[0023] A new type of oriented electrical steel, the thickness of the slab is 60mm, its chemical composition is: C is 0.035wt%, Si is 3.12wt%, Als is 0.02wt%, Nb is 0.04wt%, N is 0.0080wt%, P is 0.013 wt%, and the balance is Fe and unavoidable impurities.

[0024] The casting speed of the slab is 4.5m / min, the superheating degree of the molten steel is 20-30°C, and an electrical steel casting slab with an equiaxed crystal ratio of 55% is obtained. The heat preservation temperature of the electrical steel thin slab is 1190°C, and the heat preservation is 2 hours. Carry out hot rolling again, and the hot rolling is rolled to 2.2mm; The reduction rate of the last 3 passes of the hot rolling process is 15%, the final rolling temperature is 900° C., and the relaxation time after rolling is 40 seconds. Rapid cooling and coiling are then performed at a cooli...

example 2

[0031] Example 2 A kind of manufacturing method of thin slab process high magnetic induction oriented electrical steel sheet

[0032] A new type of oriented electrical steel sheet, the slab thickness is 60mm, its chemical composition is: C is 0.045wt%, Si is 3.18wt%, Als is 0.01wt%, Nb is 0.09wt%, N is 0.010wt%, P is 0.014 wt%, and the balance is Fe and unavoidable impurities.

[0033] The slab casting speed is 4.3m / min, the superheated degree of molten steel is 20-30°C, and an electrical steel slab with an equiaxed crystal ratio of 60% is obtained. The heat preservation temperature of the electrical steel thin slab is 1200°C, and the heat preservation is 2 hours. Then hot rolling, rapid cooling and coiling. Hot-rolled to 2.2mm, the reduction ratio of the last two passes of the hot-rolled process is 25%, the final rolling temperature is 950°C, and the relaxation time after rolling is 60 seconds. Rapid cooling is then performed at a cooling rate of 40° C. / sec. To obtain pre...

example 3

[0040] Example 3 A manufacturing method of thin slab technology high magnetic induction oriented electrical steel sheet

[0041] A new type of oriented electrical steel sheet, the slab thickness is 60mm, its chemical composition is: C is 0.040wt%, Si is 3.15wt%, Als is 0.03wt%, Nb is 0.06wt%, N is 0.0090wt%, P is 0.014 wt%, and the balance is Fe and unavoidable impurities.

[0042] The slab casting speed is 5.0m / min, the superheated degree of molten steel is 20-30°C, and an electrical steel slab with an equiaxed crystal ratio of 65% is obtained. The heat preservation temperature of the electrical steel thin slab is 1210°C, and the heat preservation is 2 hours. Then carry out hot rolling, rapid cooling and coiling; hot rolling to 2.2mm, the reduction rate of the last 3 passes of the hot rolling process is 20%, the final rolling temperature is 930 ° C, and the relaxation time after rolling is 50 seconds. Then perform rapid cooling at a cooling rate of 50° C. / second to obtain f...

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Abstract

The invention is about a sheet-blank high magnetic-induction technical-orientated electrical steel plate and producing method. The thickness of the sheet blank is 50-120mm which is made from C 0.030-0.050wt%, Si 2.9-3.3 wt%, Als 0.001-0.04wt%, Nb 0.01-0.12 wt%, N 0.004-0.012 wt%, P (less than 0.015 wt%), Fe (the residue). The inhibitor is AIN and Nb(C, N); first to heat the sheet blank to 1150-1300DEG C and heat insulate for 2-5h, then to hot roll, cool quickly and wind up, next to cold roll to the thickness of less than 0.30mm, then to anneal by decarbonization, forming roll after being coated with MgO layer, at last to anneal high temperature. The process is simple and the electrical sheet has high magnetic induction and low loss of Fe.

Description

1. Technical field: [0001] The invention belongs to the technical field of oriented electrical steel sheets. In particular, it relates to a thin slab process high magnetic induction oriented electrical steel sheet and a manufacturing method thereof. 2. Background technology [0002] For thin slab continuous casting machines, the cooling intensity is high and the cooling speed is fast. The oxides, sulfides and nitrides precipitated during rapid solidification are fine. The experimental research of Hou Teng Yugui et al. shows (Hou Teng Yugui et al.: Precipitation characteristics of oxides in steel during rapid solidification, Iron and Steel, 1997, vol.83, No.12, p.61. Zhou Deguang, Fu Jie, Wang Zhongbing, Li Jing, Xu Zhongbo, Liu Delu, Kang Yonglin, Chen Guijiang, Li Liejun: As-Cast Microstructure Characteristics of CSP Thin Slab, 2002 International Symposium on Thin Slab Casting and Rolling, Guangzhou, December 2002. Liu Delu, Chen Nanjing , Huo Xiangdong, Wang Yuanli, Fu ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P23/04C22C38/12C21D11/00C21D9/70C21D1/26B21B37/00
CPCY02P10/20
Inventor 吴开明
Owner WUHAN UNIV OF SCI & TECH
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