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Sheet slab process low-carbon high-manganese oriented electrotechnical steel sheet, and its manufacturing method

A technology of oriented electrical steel sheets and manufacturing methods, applied in the direction of manufacturing tools, metal rolling, temperature control, etc., can solve the problems of high heating temperature, many process steps, high annealing temperature, etc., and achieve low heating temperature, high quality, and final high temperature The effect of lowering the annealing temperature

Inactive Publication Date: 2007-01-10
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] Example 1 A thin slab process low carbon and high manganese oriented electrical steel sheet and its manufacturing method.

[0025] A new grain-oriented electrical steel, the slab thickness is 60mm, and its chemical composition is: C is 0.015wt%, Si is 2.15wt%, Mn is 1.5wt%, Als is 0.03wt%, Nb is 0.0wt%, N is 0.0080 wt %, P is 0.01 wt %, and the rest are Fe and inevitable impurities.

[0026] The billet pulling speed is 4.8m / min, and the superheat degree of molten steel is 20-40°C to obtain an electrical steel billet with an equiaxed crystallinity rate of 50%. The heat preservation temperature of the electrical steel thin slab is 1200℃, and the heat preservation time is 2 hours. Hot rolling was carried out, the slab was hot rolled to 2.2 mm, the reduction ratio of the last three passes of the hot rolling process was 18%, the final rolling temperature was 920° C., and the relaxation time after rolling was 45 s. Then, rapid cooling and coiling are carried out, and the co...

example 2

[0032] Example 2 A method of manufacturing a low carbon and high manganese oriented electrical steel sheet in a thin slab process.

[0033] A new type of oriented electrical steel with a slab thickness of 60mm and its chemical composition is: C is 0.010wt%, Si is 2.2wt%, Mn is 1.6wt%, Als is 0.01wt%, Nb is 0.09wt%, N It is 0.0090wt%, P is 0.014, and the rest is Fe and inevitable impurities.

[0034] The billet pulling speed is 4.6m / min, the superheat degree of molten steel is 20-40℃, and the electric steel billet with equiaxed crystallinity rate of 55% is obtained. The soaking temperature of the electrical steel sheet is 1200°C, and the temperature is kept for 2 hours. Carry out hot rolling, hot rolling to 2.2mm, the rolling reduction of the last 3 passes of the hot rolling process is 20%, the final rolling temperature is 960 ° C, and the relaxation time after rolling is 50 seconds; then rapid cooling and coiling are carried out. Take, the cooling rate is 60 ℃ / sec, to obtain...

example 3

[0040] Example 3 A thin slab process low carbon and high manganese oriented electrical steel sheet and its manufacturing method.

[0041] A new grain-oriented electrical steel, the slab thickness is 60mm, and its chemical composition is: C is 0.006wt%, Si is 2.3wt%, Mn is 1.65wt%, Als is 0.02wt%, Nb is 0.07wt%, and N is 0.07wt%. 0.0090 wt %, P is 0.014 wt %, and the rest are Fe and inevitable impurities.

[0042] The billet pulling speed is 5.3m / min, and the superheat degree of molten steel is 20-40°C to obtain an electrical steel billet with an equiaxed crystallinity rate of 60%. The heat preservation temperature of the electrical steel sheet slab is 1190℃, and the heat preservation time is 2 hours. Hot rolling was performed to 2.2 mm, the reduction ratio of the last two passes of the hot rolling process was 25%, the finishing temperature was 940° C., and the relaxation time after rolling was 45 seconds. Then rapid cooling and coiling are carried out at a cooling rate of 50...

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Abstract

The invention relates to a manufacture method for sheet bar technology low carbon high manganese orientating electric steel sheets and strips. The method includes the following steps: the thickness of sheet bar technology is 50-150mm, and the chemistry constituents are: C 0.002-0.03wt%, Si is 2.1-2.4wt%, Mn is 1.2-1.8wt%, Al is 0.001-0.04wt%, Nb is 0.01-0.12wt%, N is 0.004-0.012wt%, P is below 0.015wt%, and the rest is Fe and other impurity, the inhibitor is AlN and Nb(C, N); heating the sheet bar to 1150-1300 degree centigrade and keeping for 2-5 hours to take hot rolling, fast cooling and coiling; rolling the sheet to the thickness below 0.35mm by once cold rolling process; taking decarburizing annealing, coating magnesia isolating layer, punching, high annealing. The invention adopts once cold rolling process, lower heating temperature and final high annealing temperature. The orientating electric steel sheets and strips has low cost and low iron loss.

Description

1. Technical field: [0001] The invention belongs to the technical field of oriented electrical steel plates. In particular, it relates to a method for manufacturing a low-carbon high-manganese oriented electrical steel sheet by thin slab technology. 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 that when rapid solidification occurs, the oxides, sulfides and nitrides are small in size (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 Thin Slab Casting and Rolling International Sem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C21D8/12C21D11/00B21B37/16B21B37/74C21D1/26C21D1/68B22D11/16
Inventor 吴开明
Owner WUHAN UNIV OF SCI & TECH
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