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High magnetic induction grain-oriented silicon steel stripe nitriding treatment method

A technology of high magnetic induction orientation and nitriding treatment, applied in coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems of low nitriding efficiency, instability, affecting the stability of secondary recrystallization, etc.

Inactive Publication Date: 2012-06-27
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

[0021] The purpose of the present invention is to solve the low-temperature nitriding method nitride instability in the existing low-slab heating temperature method to produce high magnetic induction oriented silicon steel technology, which easily affects the stability of secondary recrystallization, while the high-temperature nitriding method nitriding Insufficient of low efficiency and uneven nitriding amount, it provides a high magnetic induction orientation that can increase the nitrogen penetration depth, uniform nitriding, and excellent surface quality of the steel strip. Silicon steel strip nitriding treatment method

Method used

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  • High magnetic induction grain-oriented silicon steel stripe nitriding treatment method
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  • High magnetic induction grain-oriented silicon steel stripe nitriding treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A nitriding treatment method for high magnetic induction oriented silicon steel strip, the experimental conditions: the thickness of the cast slab is 230mm, the chemical composition and weight percentage of the cast slab are: Si: 3.15%, C: 0.058%; Mn: 0.10%; S: 0.010%; Als: 0.030%; N: 0.0080%; Cu: 0.080%; Sn: 0.053%; Cr: 0.020%; The board thickness is 2.2mm, and the product thickness is 0.23mm.

[0039] Its steps:

[0040] 1) After smelting and continuous casting, the cast slab is heated to 1175-1185°C, hot-rolled to 2.2mm, normalized and cold-rolled, in H 2 and N 2 Carry out decarburization annealing in a dry mixed atmosphere, the decarburization annealing temperature is 825-835°C, the annealing time is 150 seconds, and the final C content in the steel strip is controlled to 19ppm;

[0041] 2) One-time nitriding: in H 2 and N 2 Nitriding is carried out under a dry mixed atmosphere, the nitriding temperature is 840-850 ° C, according to 2.5m 3 / ton of steel into ...

Embodiment 2

[0047] A nitriding treatment method for high magnetic induction oriented silicon steel strip, the experimental conditions: the thickness of the cast slab is 210mm, the chemical composition and weight percentage of the cast slab are: Si: 3.25%, C: 0.055%; Mn: 0.10%; S: 0.009%; Als: 0.032%; N: 0.0050%; Cu: 0.080%; Sn: 0.043%; Cr: 0.040%; The board thickness is 2.3mm, and the product thickness is 0.23mm.

[0048] Its steps:

[0049] 1) After smelting and continuous casting, the billet is heated to 1115-1125°C, hot-rolled to 2.3mm, normalized and cold-rolled. 2 and N 2 Carry out decarburization annealing in a dry mixed atmosphere, the decarburization annealing temperature is 830-840°C, the annealing time is 50 seconds, and the final C content in the steel strip is controlled to 20ppm;

[0050] 2) One-time nitriding: in H 2 and N 2 Nitriding is carried out under dry mixed atmosphere, the nitriding temperature is 790-800°C, according to 2m 3 / ton of steel into NH 3 , and con...

Embodiment 3

[0056] A nitriding treatment method for high magnetic induction oriented silicon steel strip, the experimental conditions: the thickness of the cast slab is 210mm, the chemical composition and weight percentage of the cast slab are: Si: 3.25%, C: 0.065%; Mn: 0.15%; S: 0.009%; Als: 0.032%; N: 0.0040%; Cu: 0.020%; Sn: 0.060%; Cr: 0.020%; The board thickness is 2.3mm, and the product thickness is 0.23mm.

[0057] Its steps:

[0058] 1) After smelting and continuous casting, the cast slab is heated to 1150-1160°C, hot-rolled to 2.3mm, normalized and cold-rolled, in H 2 and N 2 Carry out decarburization annealing in a dry mixed atmosphere, the decarburization annealing temperature is 800-810°C, the annealing time is 180 seconds, and the final C content in the steel strip is controlled to 15ppm;

[0059] 2) One-time nitriding: in H 2 and N 2 Nitriding is carried out under a dry mixed atmosphere, the nitriding temperature is 820-830°C, according to 3.0m 3 / ton of steel into NH...

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PUM

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Abstract

The present invention relates to a high magnetic induction grain-oriented silicon steel stripe nitriding treatment method, which comprises the following steps smelting, continuously casting, billet heating, hot rolling, normalizing and cold rolling, decarburization annealing; one-time nitriding; homogenized treating; coating a magnesium oxide isolation agent; high temperature annealing; coating an insulating layer, stretching, flattening for next application. The homogenization treatment can ensure that the metastable nitrogen formed by nitriding is dispersed in the steel strip in time, and conversed to stable AlN simultaneously. So that enough stable AlN is formed in the steel strip before high temperature annealing, the stability of the inhibitor state can be ensured in a large high temperature annealing process range, and the stability of magnetic property can be ensured, thereby the bottom quality with excellent adhesion and no defect is obtained.

Description

technical field [0001] The invention relates to a production method of oriented silicon steel, in particular to a nitriding post-treatment method of high magnetic induction oriented silicon steel. Background technique [0002] Oriented silicon steel refers to silicon steel products whose constituent grains have a certain orientation (generally refers to the Goss orientation {110}<001>), the surface of the steel strip is parallel to the {110} plane, and the rolling direction is parallel to the <001> direction. Grain-oriented silicon steel is mainly used to manufacture the iron core of the transformer. Through its excellent soft magnetic characteristics and magnetization performance, it provides high magnetic flux for the transformer, thereby realizing efficient electric-magnetic-electric conversion function. [0003] The main parameters to measure the magnetization performance of grain-oriented silicon steel are magnetic flux density and iron loss. Magnetic flux ...

Claims

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Application Information

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IPC IPC(8): C23F17/00C23C8/26C23C8/80C21D8/12
Inventor 郭小龙许光毛炯辉王若平骆忠汉林勇孙亮方泽民陈圣林
Owner 武钢集团有限公司
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