Method for producing oriented silicon steel with good bottom by low-temperature heating

A low-temperature technology for oriented silicon steel, applied in the field of low-temperature heating to produce oriented silicon steel, can solve the problems of large burning loss, low utilization rate, and inability to form a bottom layer

Active Publication Date: 2007-06-13
BAOSHAN IRON & STEEL CO LTD
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AI Technical Summary

Problems solved by technology

[0006] (2) The slab is heated at a high temperature of 1400°C, which has reached the limit level of the heating furnace; high temperature heating, large burning loss, and frequent repairs of the heating furnace result in low utilization and high energy consumption; the edge cracks of the hot-rolled coil are large, resulting in cold rolling The production process is difficult, the finished product rate is low, and the cost is high
However, due to the influence of halogen compounds, a good bottom layer cannot be formed in some parts

Method used

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Embodiment Construction

[0055] Use a 500kg vacuum furnace to make steel, the chemical composition of the smelting:

[0056] C: ≤ 0.065%, Si: ≤ 3.5%, Als ≤ 0.035%, Mn: ≤ 0.20%, Cu ≤ 0.12%, Sn ≤ 0.15%, and control very little N and S process components to form silicon steel slabs.

[0057] ●Silicon steel slabs are heated below 1280°C;

[0058] ●Normalization condition 1150℃×5s+930℃×70s+50℃ / s cooling, strip cold rolling to 0.30mm, 850℃ nitriding, dew point in heating section: -15℃~-40℃;

[0059] ●Nitriding time: 5-50 seconds;

[0060] ●Nitriding medium: NH 3 , requires the use of dry NH 3 , the dew point is below -40°C;

[0061] ●Protective atmosphere: H 2 with N 2 Mixed gas, H 2 Content: 20~75%, atmosphere dew point (ie nitriding dew point) -15℃~-40℃, NH 3 The concentration accounts for the total amount of gas: 0.1-25%;

[0062] The nitriding target is about 170ppm, the dew point of decarburization annealing is 50℃~75℃, the special MgO for silicon steel is used, and its hydration rate (Hydrabi...

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Abstract

The invention supplies a method used to produce orientation silicon steel by low temperature heating. It includes the following steps: heating the plate blank under 1280 degree centigrade; hot rolling; once or double cold rolling to gain finished product sheet thickness; nitriding treatment; decarburizing annealing; coating insulator; high temperature annealing. In the nitriding technology, heating area dew point is controlled at -15-40 degree centigrade. The invention has the advantages of high nitriding efficiency, no influence from the surface oxide film, excellent MgO coat formula which makes the magnesium silicate substrate have good magnetic property, ensure the implementation for the next hot leveling annealing and insulating coating.

Description

technical field [0001] The invention relates to a method for producing oriented silicon steel by low-temperature heating, in particular to a method for producing oriented silicon steel by low-temperature heating with a good bottom layer. Background technique [0002] (1) The production method of traditional grain-oriented silicon steel is as follows: [0003] The basic chemical composition is Si(2.5~4.5%), [C](0.01~0.10%), Mn(0.03~0.1%), S(0.012~0.050%), Als(0.01~0.05%), N(30~ 120ppm), some composition systems also contain one or more of Cu, Mo, Sb, Cr, B, Bi and other elements, and the rest are iron and unavoidable impurity elements; the slab is heated in a special high-temperature heating furnace to The temperature is about 1400 ℃, and the heat preservation is carried out for more than 30 minutes to fully dissolve the inclusions. After the hot-rolled sheet is normalized, it is pickled; it is rolled to the finished product by one cold rolling or two or more cold rolling me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C23C8/26C21D1/68C21D9/46C21D11/00
Inventor 路林林李国保孙焕德黄昌国沈侃毅
Owner BAOSHAN IRON & STEEL CO LTD
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