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Nitriding treatment process for cold-rolled oriented electrical steel strip

A technology of oriented electrical steel and nitriding treatment, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of poor nitriding effect, slow nitriding speed, long production cycle, etc., and achieve Convenient implementation, reduced consumption, and improved oxygen content

Inactive Publication Date: 2021-09-21
无锡晶龙华特电工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the purpose of the present invention is to provide a nitriding treatment process for cold-rolled oriented electrical steel strip, which solves the problems of slow nitriding speed, poor nitriding effect, large energy consumption and long production cycle in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A nitriding treatment process for a cold-rolled grain-oriented electrical steel strip, comprising the following steps:

[0033] S1. After smelting and continuous casting, the process of hot continuous rolling, normalized pickling, cold rolling and decarburization annealing is carried out on the slab;

[0034] Among them, the chemical composition and mass percentage of the slab are:

[0035] C 2.5%; Si 0.02%; Mn 0.1%; P 0.003%; S 0.005%; Als 0.035%; N 0.005%; Cu 0.1%; Sn 0.06%; RE 0.02%; AIN is used as the main inhibitor, so it is required to contain at least 0.025% AIs and 0.03% N in the composition to ensure the formation of the required inhibitors, but when Al is greater than 0.035, it is easy to form coarse AIN inclusions, which will adversely affect the magnetic properties. After 0.01%, it is easy to form bubbles on the surface of the steel strip to affect the quality, and it is difficult to control the size of the primary recrystallized grains. Since more nitrogen...

Embodiment 2

[0048] A nitriding treatment process for a cold-rolled grain-oriented electrical steel strip, comprising the following steps:

[0049] S1. After smelting and continuous casting, the process of hot continuous rolling, normalized pickling, cold rolling and decarburization annealing is carried out on the slab;

[0050] Among them, the chemical composition and mass percentage of the slab are:

[0051] C 3.5%; Si 0.03%; Mn 0.1%; P 0.006%; S 0.006%; Als 0.025%; N 0.003%; Cu 0.15%; Sn 0.07%; RE 0.03%; AIN is used as the main inhibitor, so it is required to contain at least 0.025% AIs and 0.03% N in the composition to ensure the formation of the required inhibitors, but when Al is greater than 0.035, it is easy to form coarse AIN inclusions, which will adversely affect the magnetic properties. After 0.01%, it is easy to form bubbles on the surface of the steel strip to affect the quality, and it is difficult to control the size of the primary recrystallized grains. Since the nitridin...

Embodiment 3

[0064] A nitriding treatment process for a cold-rolled grain-oriented electrical steel strip, comprising the following steps:

[0065] S1. After smelting and continuous casting, the process of hot continuous rolling, normalized pickling, cold rolling and decarburization annealing is carried out on the slab;

[0066] Among them, the chemical composition and mass percentage of the slab are:

[0067] C 4.5%; Si 0.04%; Mn 0.15%; P 0.005%; S 0.004%; Als 0.03%; N 0.004%; Cu 0.2%; Sn 0.1%; RE 0.03%; AIN is used as the main inhibitor, so it is required to contain at least 0.025% AIs and 0.03% N in the composition to ensure the formation of the required inhibitors, but when Al is greater than 0.035, it is easy to form coarse AIN inclusions, which will adversely affect the magnetic properties. After 0.01%, it is easy to form bubbles on the surface of the steel strip to affect the quality, and it is difficult to control the size of the primary recrystallized grains. Since the nitriding ...

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Abstract

The invention relates to the technical field of electrical steel production, in particular to a nitriding treatment process for a cold-rolled oriented electrical steel strip, and aims to solve the problems of low nitriding speed, poor nitriding effect, high energy consumption and long production period in the prior art. The process comprises the following steps that S1, after smelting and continuous casting, a casting blank is subjected to the procedures of hot continuous rolling, normalizing acid pickling, cold rolling and decarburization annealing; S2, two-stage nitriding treatment is conducted in the nitriding furnace, specifically, S21, the nitriding temperature of the first-stage nitriding treatment ranges from 750 DEG C to 950 DEG C, the nitriding time ranges from 25 seconds to 35 seconds, in addition, the injection pressure of a nitriding medium ranges from 0.15 MPa to 0.25 MPa, and the flow of the nitriding medium ranges from 5 NL / min to 20 NL / min; S22, after being soaked in the rare earth solution for 1-2 hours, the aluminum alloy is subjected to second-section nitriding treatment, the nitriding temperature ranges from 460 DEG C to 560 DEG C, the nitriding time ranges from 10 seconds to 25 seconds, in addition, the injection pressure of a nitriding medium ranges from 0.15 MPa to 0.25 MPa, and the flow of the nitriding medium ranges from 1 NL / min to 10 NL / min; and S3, coating an isolating agent, and performing high-temperature purification and annealing to obtain a finished product.

Description

technical field [0001] The invention relates to the technical field of electrical steel production, in particular to a nitriding treatment process for a cold-rolled oriented electrical steel strip. Background technique [0002] Grain-oriented electrical steel is used to make iron cores of transformers, electromagnetic switches and other devices, and plays an important role in the fields of electric power, electronics, and military industry. At present, the manufacturing methods of grain-oriented electrical steel are mainly divided into high-temperature and low-temperature slab preparation methods. Low-temperature high-inductance grain-oriented electrical steel is hot-rolled slab temperature below 1250 ° C, through hot rolling, normalization, cold rolling, decarburization, etc. Electrotechnical materials with low cost and high performance prepared by nitrogen annealing, high temperature annealing and stretching annealing. Among them, the nitriding process is to make the mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/26C22C38/02C22C38/04C22C38/06C22C38/16C23C8/02C23C8/80
CPCC23C8/26C23C8/02C23C8/80C22C38/02C22C38/04C22C38/06C22C38/16C22C38/008C22C38/001
Inventor 吴让平
Owner 无锡晶龙华特电工有限公司
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