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Thin-gauge medium-low-grade non-oriented silicon steel for improving surface pocking mark defects and production method thereof

A production method and technology of oriented silicon steel, which is applied in the field of non-oriented electrical steel production, can solve the problems of thin thickness and low strength, reduce the incidence of pitting on the surface of the plate, improve the surface quality of the strip steel, and improve the magnetic properties Effect

Pending Publication Date: 2022-01-07
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this plan does not specifically involve the production of thin-gauge, medium-low grade non-oriented silicon steel, and does not take into account the inherent characteristics of this type of steel such as low strength and thin thickness.

Method used

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  • Thin-gauge medium-low-grade non-oriented silicon steel for improving surface pocking mark defects and production method thereof
  • Thin-gauge medium-low-grade non-oriented silicon steel for improving surface pocking mark defects and production method thereof
  • Thin-gauge medium-low-grade non-oriented silicon steel for improving surface pocking mark defects and production method thereof

Examples

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Effect test

Embodiment 1

[0042] A method for producing non-oriented silicon steel with thin gauge and medium and low grades for improving surface pitting defects, comprising the following steps:

[0043] 1) Continuous casting into a slab with a thickness of 230 mm after molten iron pretreatment, converter steelmaking, and vacuum treatment. The chemical composition weight percentages of the slab are respectively C: 0.0020%; Si: 1.55%; Als: 0.20%; Mn: 0.28%; P: 0.077%; S: 0.0023%, N: 0.0023%, Ti: 0.0023%, and the rest are Fe and unavoidable impurity elements.

[0044] 2) After the slab is cooled to no less than 550°C, it enters the heating furnace for heating. The temperature of the slab in the heating furnace is 1130°C, and the heating and holding time is 230 minutes;

[0045] 3) After 7 passes of hot rolling, finish rolling to a thickness of 2.3mm, the final rolling temperature is 870°C, and the temperature is reduced to a curling temperature of 650°C after air cooling and water cooling;

[0046] 4) ...

Embodiment 2

[0051] A method for producing non-oriented silicon steel with thin gauge and medium and low grades for improving surface pitting defects, comprising the following steps:

[0052] 1) Continuous casting into a slab with a thickness of 230 mm after molten iron pretreatment, converter steelmaking, and vacuum treatment. The chemical composition weight percentages of the slab are respectively C: 0.0021%; Si: 1.53%; Als: 0.18%; Mn: 0.30%; P: 0.09%; S: 0.0022%, N: 0.0024%, Ti: 0.0009%, and the rest are Fe and unavoidable impurity elements.

[0053] 2) The slab is cooled to no less than 550°C and enters the heating furnace for heating. The temperature of the slab in the heating furnace is 1180°C, and the heating and holding time is 220 minutes;

[0054] 3) After 7 passes of hot rolling, finish rolling to a thickness of 2.3mm, the final rolling temperature is 880°C, and the temperature is reduced to a coiling temperature of 620°C after air cooling and water cooling;

[0055] 4) The nor...

Embodiment 3

[0060] A method for producing non-oriented silicon steel with thin gauge and medium and low grades for improving surface pitting defects, comprising the following steps:

[0061] 1) The steel is continuously cast into a slab with a thickness of 230mm after molten iron pretreatment, converter steelmaking, and vacuum treatment. The chemical composition weight percentages of the slab are respectively C: 0.0019%; Si: 1.58%; Als: 0.19%; Mn : 0.33%; P: 0.088%; S: 0.0019%, N≤0.0021%, Ti≤0.0009%, and the rest are Fe and unavoidable impurity elements.

[0062] 2) After the slab is cooled to no less than 550°C, it enters the heating furnace for heating. The temperature of the slab in the heating furnace is 1150°C, and the heating and holding time is 220 minutes;

[0063] 3) After 7 passes of hot rolling, finish rolling to a thickness of 2.3mm, the final rolling temperature is 890°C, and the temperature is reduced to a curling temperature of 600°C after air cooling and water cooling;

...

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Abstract

The invention provides thin-gauge medium-low-grade non-oriented silicon steel for improving surface pocking mark defects and a production method thereof. The thin-gauge medium-low-grade non-oriented silicon steel comprises the following components: C < = 0.0025%, 1.2 < = Si < = 1.65%, 0.25 < = Mn < = 0.35%, 0.06 < = P < = 0.11%, 0.1 < = Als < = 0.2%, S < = 0.0025%, N < = 0.0025%, Ti < = 0.0025% and the balance of Fe and inevitable impurities. Compared with the prior art, the low hydrogen concentration is adopted, reduction of oxide scale in a furnace is prevented, the corrosion degree of a carbon sleeve roller is reduced, the nodulation rate of the carbon sleeve roller is reduced, and the surface quality of strip steel is improved; and the reasonable alloy component design is adopted, the mechanical strength of strip steel is improved, the influence degree of carbon sleeve roller nodulation on the strip steel surface is reduced, and the strip steel surface quality is improved. The thickness of the product is 0.35 mm, the occurrence rate of pocking marks on the plate surface is reduced, the hand feeling is avoided, and the number of the pocking marks in the perimeter period range of a roller body is smaller than or equal to 5.

Description

technical field [0001] The invention belongs to the technical field of non-oriented electrical steel production, and in particular relates to a thin-gauge medium-low grade non-oriented silicon steel and a production method thereof for improving surface pitting defects. Background technique [0002] Non-oriented silicon steel, especially non-oriented silicon steel with thin specifications and low grades, is easy to be oppressed by nodules on the surface of carbon rollers during the production process of continuous annealing furnace, resulting in pitting defects, resulting in poor surface quality of silicon steel. Therefore, how to improve the surface quality of thin-gauge, medium-low grade non-oriented silicon steel has become a difficult problem in on-site production. [0003] CN104878187A published on September 2, 2015 discloses a tumor removal method, which controls the dew point in the furnace within the range of 25°C-30°C, and at the same time adjusts the atmosphere in t...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C33/04C21D8/12C21D1/26C21D1/74
CPCC22C38/004C22C38/02C22C38/04C22C38/06C22C33/04C21D8/1222C21D8/1233C21D8/1244C21D1/26C21D1/74C21D2201/05
Inventor 徐文祥裴英豪施立发程国庆祁旋杜军陆天林
Owner MAANSHAN IRON & STEEL CO LTD