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Method for producing low nitriding amount and high magnetic induction oriented silicon steel strip

A technology of oriented silicon steel and production method, applied in the direction of coating, metal material coating process, metal rolling, etc., can solve the problems of high production process cost, etc., achieve reduced nitriding amount, shortened nitriding time, and reduce production cost Effect

Inactive Publication Date: 2010-07-14
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In addition, when the steel strip is continuously nitriding and annealed in the prior art, the N 2 -H 2 H in the atmosphere 2 The proportion of N is usually required to be greater than 50%, and N 2 -H 2 The atmosphere is mainly composed of 25% N 2 +75% H 2 Composition, H 2 The cost is significantly higher than that of N 2 cost, leading to a corresponding increase in the cost of the entire production process

Method used

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  • Method for producing low nitriding amount and high magnetic induction oriented silicon steel strip
  • Method for producing low nitriding amount and high magnetic induction oriented silicon steel strip

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Embodiment and comparative example 1

[0031] A production method for rolling a continuous casting slab with a thickness of 210 mm into a low-nitriding high-magnetic induction oriented silicon steel strip comprises the following steps:

[0032] 1) In the molten steel continuous casting process, cast a continuous casting slab with a thickness of 210 mm, and control its chemical composition in terms of weight percentage: C: 0.050, Si: 3.25, Al sol : 0.032, N: 0.0055, Cu: 0.055, Sn: 0.085, Mn: 0.120, S: 0.010, Cr: 0.080, P: 0.015, Ti: 0.002, and the rest are Fe and inevitable inclusions.

[0033] 2) The obtained continuous casting slab is heated to 1170° C. for hot rolling, and rolled into a hot-rolled steel strip with a thickness of 2.3 mm, and the coiling temperature of the hot-rolled steel strip is controlled at 550° C.

[0034] 3) Two-stage annealing and normalization processes are used to process the obtained hot-rolled steel strip. The heating temperature of the first stage annealing and normalization process is...

Embodiment and comparative example 2

[0045] A production method for rolling a continuous casting slab with a thickness of 230mm into a low nitriding amount high magnetic induction oriented silicon steel strip comprises the following steps:

[0046] 1) In the molten steel continuous casting process, cast a 230mm thick continuous casting slab, and control its chemical composition in terms of weight percentage: C: 0.059, Si: 3.12, Al sol : 0.0293, N: 0.0070, Cu: 0.050, Sn: 0.10, Mn: 0.07, S: 0.004, Cr: 0.13, P: 0.010, Ti: 0.002, and the rest are Fe and inevitable inclusions.

[0047] 2) The obtained continuous casting slab is heated to 1150° C. for hot rolling, and rolled into a hot-rolled steel strip with a thickness of 2.2 mm. The coiling temperature of the hot-rolled steel strip is controlled at 550° C.

[0048] 3) Two-stage annealing and normalization processes are used to process the obtained hot-rolled steel strip. The heating temperature of the first stage annealing and normalization process is 1100 ° C, and ...

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Abstract

The invention discloses a method for producing a low nitriding amount and high magnetic induction oriented silicon steel strip, which comprises the procedures of controlling chemical components in a continuous casting blank, heating to 1,100-1,200 DEG C, hot rolling to form a hot-rolling steel strip with the thickness of 2.0-2.5mm, carrying out two-section normalizing annealing, coldly rolling to form a cold-rolling steel strip with the thickness of 0.23-0.30mm once, and carrying out continuous decarburization processing, continuous nitridation processing and secondary recrystallization annealing processing, conventionally cooling, and the like. In the procedure of the continuous nitridation processing, the N in the cold-rolling steel strip is controlled to be 0.0095-0.0150 in percentage by weight; in the procedure of the secondary recrystallization annealing processing, when the steel strip is heated to 750-1,100 DEG C, the volume rate of N2 is controlled to be 75-90 percent relative to the total volume rate of the N2-H2 atmosphere; and finally, the low nitriding amount and high magnetic induction oriented silicon steel strip is prepared. The invention has proper heat treatment temperature on a plate blank, low manufacture cost and high product quality and can meet the requirements of the high-quality oriented silicon steel for an iron core of a transformer.

Description

technical field [0001] The invention relates to the manufacturing technology of oriented silicon steel, in particular to a production method of oriented silicon steel strip with low nitriding amount and high magnetic induction mainly used in transformer iron core. Background technique [0002] The transformer core is mainly composed of oriented silicon steel laminations. The laminations are cut along the rolling direction of the oriented silicon steel strip and form a ring circuit. The working form of the transformer itself is that the primary coil current induces magnetic flux in the iron core, and the magnetic flux generates current in the secondary coil, thereby realizing the conversion function of electricity-magnetism-electricity. Among the magnetic parameters, the magnetic flux density is represented by B, and the unit is T; the iron loss under the condition of a given frequency and magnetic flux density is represented by P, and the unit is W / Kg. Oriented silicon stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/34B21B1/46C21D1/26C23C8/26
Inventor 王若平毛炯辉方泽民曹阳张先贵骆忠汉黎世德刘良田钟光明鲁军曾武张文辉许光蔡延礴许慧英黄斌
Owner 武钢集团有限公司
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