Method for producing high magnetic induction orientation silicon steel with excellent magnetic performance and good bottom layer

A technology of high magnetic induction orientation and production method, which is applied in the production of high magnetic induction oriented silicon steel and the field of high magnetic induction oriented silicon steel with good bottom layer, to achieve the effect of improving the quality of the bottom layer and appropriate thickness of the bottom layer

Active Publication Date: 2012-10-31
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] The purpose of the present invention is to provide a production method of high magnetic induction oriented silicon steel with excellent magnetic properties and a good bottom layer, to solve the problem of nitrogen stability in the plate after nitriding, so that the

Method used

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  • Method for producing high magnetic induction orientation silicon steel with excellent magnetic performance and good bottom layer
  • Method for producing high magnetic induction orientation silicon steel with excellent magnetic performance and good bottom layer
  • Method for producing high magnetic induction orientation silicon steel with excellent magnetic performance and good bottom layer

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Effect test

Embodiment 1

[0046] Smelt and cast according to the chemical composition described in Table 1. The slabs with different components were heated at 1150°C and then hot-rolled to a hot-rolled plate with a thickness of 2.3 mm. Two-stage normalization was adopted for the hot-rolled sheet: (1120°C×15sec)+(870°C×150sec), followed by cooling at a rate of -20°C / sec. After pickling, it is cold rolled to a finished product thickness of 0.30mm. Decarburization annealing is carried out under the conditions of decarburization annealing temperature rise rate 25°C / s, decarburization temperature 845°C×135s, and decarburization dew point 67°C, so that the [C] content in the steel plate is reduced to below 30ppm. Nitriding annealing process: 780℃×30sec, oxidation degree PH 2 O / PH 2 is 0.045, NH 3 The dosage is 3.5%, and the infiltration [N] content is 170ppm. After coating the release agent with MgO as the main component, in the atmosphere of 100% H 2 , The dew point is -10°C, and the temperature is 12...

Embodiment 2

[0052] The components and weight percentages of oriented silicon steel slabs are Si: 3.25%, C: 0.070%, S: 0.008%, Als: 0.023%, N: 0.005%, Mn: 0.15%, Sn: 0.04%, and the rest are Fe and unavoidable impurities. The different hot rolling process conditions are shown in Table 2 below. For the 2.3mm hot-rolled plate, two-stage normalization is adopted: (1110°C×10sec)+(900°C×120sec), followed by cooling at a rate of -20°C / sec. Then it is pickled and cold-rolled to a finished product thickness of 0.30mm. Decarburization annealing is carried out under the conditions of decarburization annealing temperature rise rate of 25°C / s, decarburization temperature of 840°C×125s, and decarburization dew point of 70°C, so as to reduce the [C] content in the steel plate to below 30ppm. Nitriding annealing process: 800℃×30sec, oxidation degree PH 2 O / PH 2 is 0.095, NH 3 The dosage is 1.5%, and the infiltration [N] content is 210ppm. After coating the release agent with MgO as the main componen...

Embodiment 3

[0057] The components and weight percentages of oriented silicon steel slabs are Si: 3.25%, C: 0.070%, S: 0.008%, Als: 0.023%, N: 0.005%, Mn: 0.15%, Sn: 0.04%, and the rest are Fe and unavoidable impurities. The slab was heated at 1120° C., and hot-rolled to a hot-rolled plate with a thickness of 2.5 mm. The different two-stage normalization processes are shown in Table 3 below. After the normalized plate is pickled, it is cold-rolled to a finished product thickness of 0.30mm. Then decarburization annealing is carried out at a heating rate of 30°C / sec, a decarburization temperature of 840°C×130s, and a decarburization dew point of 65°C. After coating the release agent with MgO as the main component, perform high-temperature annealing for 20 hours under the conditions of 100% H2 atmosphere, -10°C dew point, and 1200°C temperature. After uncoiling, the magnetic properties of the finished product are shown in Table 3 after coating with insulating coating and stretching and lev...

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Abstract

The invention relates to a method for producing high magnetic induction orientation silicon steel with excellent magnetic performance and a good bottom layer. The method comprises the following steps: (1) smelting, casting, making steel by using a converter or an electric furnace, and performing secondary refining and continuous casting on molten steel to obtain a plate blank; (2) performing hot rolling; (3) normalizing: performing two-section normalization, and then cooling; (4) performing cold rolling: rolling the normalized plate into the plate with the thickness of the finished product plate by a primary cold rolling method; (5) performing decarburizing annealing and nitriding annealing; (6) coating MgO coating and annealing at high temperature; and (7) coating insulating coating on the surface of a high-temperature annealing plate and performing heat drawing and flat annealing to obtain the high magnetic induction orientation silicon steel with excellent magnetic performance. According to the method, the problem of nitrogen stability in the plate after nitriding is solved, so that secondary recrystallization in the high-temperature annealing process is perfected and the high magnetic induction orientation silicon steel with excellent magnetic performance (B8 is more than or equal to 1.90 T and P17/50 is less than or equal to 1.00 w/kg), with the good bottom layer and without the defects of crystal exposure and frost descend is obtained finally.

Description

technical field [0001] The invention relates to a production method of oriented silicon steel, in particular to a production method of high magnetic induction oriented silicon steel with excellent magnetic properties and a good bottom layer, and finally obtains excellent magnetic properties (B8≥1.90T, P17 / 50≤1.00w / kg), no Good underlying high magnetic induction oriented silicon steel for dew crystal and frost defects. Background technique [0002] The production method of traditional high magnetic flux density oriented silicon steel is as follows: [0003] Use a converter (or electric furnace) to make steel, carry out secondary refining and alloying, and continuously cast into a slab. Its basic chemical composition is Si (2.5-4.5%), C (0.06-0.10%), Mn (0.03-0.1%) ), S (0.012-0.050%), Als (0.02-0.05%), N (0.003-0.012%), and some component systems also contain one or more of Cu, Mo, Sb, B, Bi and other elements , the rest are iron and unavoidable impurity elements; the slab ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C33/04C21D8/12
CPCC21D8/1283C21D8/1255
Inventor 沈侃毅徐乐江储双杰李海平崔健李国保杨勇杰胡卓超孙业中赵斌章华兵吉亚明
Owner BAOSHAN IRON & STEEL CO LTD
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