Method for improving magnetic performance of copper-containing oriented silicon steel

A technology of oriented silicon steel and magnetic properties, which is applied in the field of improving the magnetic properties of copper-containing oriented silicon steel, can solve the problems of poor magnetic properties, low ALN content, and poor suppression ability of copper-containing oriented silicon steel, so as to improve the magnetic properties of products and improve the magnetic properties , the effect of inhibiting growth

Active Publication Date: 2022-05-27
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the content of ALs (acid-soluble aluminum) in the copper-containing oriented silicon steel smelting composition obtained by the existing manufacturing process of oriented silicon steel is low, so th

Method used

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  • Method for improving magnetic performance of copper-containing oriented silicon steel
  • Method for improving magnetic performance of copper-containing oriented silicon steel
  • Method for improving magnetic performance of copper-containing oriented silicon steel

Examples

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Example Embodiment

[0027] Example 1

[0028] figure 1 is the process flow diagram of the present invention, refer to figure 1 shown, including steps:

[0029] First, steel was made in a 500kg vacuum converter thermal electric furnace. After the molten steel was subjected to secondary refining and continuous casting, a slab with the following composition (by weight percentage) was obtained: 0.040% C, 3.00% Si, 0.1% Mn, 0.006% ALs, 0.4 %Cu, 0.001%N, 0.02%S, the rest are Fe and inevitable impurities;

[0030] Then, the slab is heated to 1200°C for hot rolling, kept for 3 hours, and the final rolling temperature is 900-1000°C; then pickling and one-time cold rolling are performed to make the steel thickness 0.63mm and the oxygen content 700ppm;

[0031] Decarburization annealing: place the steel after primary cold rolling in a high temperature furnace, heat it to 700°C in a pure nitrogen atmosphere, and keep it for 10 minutes;

[0032] Secondary cold rolling to a thickness of 0.265mm, and then u...

Example Embodiment

[0034] Example 2

[0035] First, steel is made in a 500kg vacuum converter thermal electric furnace. After the molten steel is subjected to secondary refining and continuous casting, a slab with the following composition (by weight percent) is obtained: 0.055% C, 3.40% Si, 0.30% Mn, 0.030% ALs, 0.7 %Cu, 0.012%N, 0.025%S, the rest are Fe and inevitable impurities;

[0036] Then, the slab is heated to 1280°C for hot rolling, kept for 2.5h, and the final rolling temperature is 950-980°C; then pickling and one-time cold rolling are performed to make the steel thickness 0.60mm and the oxygen content 900ppm;

[0037] Decarburization annealing: place the steel after primary cold rolling in a high temperature furnace, heat it to 900°C in a pure nitrogen atmosphere, and keep it for 8 minutes;

[0038] Secondary cold rolling to a thickness of 0.10mm, and then using a coating machine to uniformly cold coat the surface of the steel with a magnesium oxide release agent after the secondary...

Example Embodiment

[0040] Example 3

[0041] First, steel is made in a 500kg vacuum converter thermal electric furnace. After the molten steel is subjected to secondary refining and continuous casting, a slab with the following composition (by weight percentage) is obtained: 0.050% C, 3.00% Si, 0.20% Mn, 0.015% ALs, 0.5 %Cu, 0.006%N, 0.022%S, the balance is Fe and inevitable impurities;

[0042]Then, the slab is heated to 1260°C for hot rolling, kept for 2.2h, and the final rolling temperature is 950-980°C; then pickling and one-time cold rolling are performed to make the steel thickness 0.62mm, and the oxygen content is 800ppm;

[0043] Decarburization annealing: place the steel after primary cold rolling in a high temperature furnace, heat it to 850°C in a pure nitrogen atmosphere, and keep it for 9 minutes;

[0044] Secondary cold rolling to a thickness of 0.20mm, and then using a coating machine to uniformly cold coat the surface of the steel with magnesium oxide release agent after seconda...

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Abstract

The invention relates to a method for improving the magnetic performance of copper-containing oriented silicon steel. The method comprises the steps that S1, steel making, secondary refining and continuous casting are conducted, and then a plate blank with the following components including, by weight, 0.040%-0.055% of C, 3.00%-3.40% of Si, 0.1%-0.30% of Mn, 0.006%-0.030% of ALs, 0.4%-0.7% of Cu, 0.006%-0.012% of N, smaller than or equal to 0.025% of S and the balance Fe and inevitable impurities is obtained; s2, the plate blank is subjected to hot rolling and primary cold rolling; s3, after primary cold rolling, performing decarburization annealing under the protection of a nitrogen and hydrogen wet atmosphere with the temperature of 800-900 DEG C and the ratio of hydrogen partial pressure to water vapor partial pressure of 0.2-0.5, so that the oxygen content in the copper-containing oriented silicon steel is 700-900 ppm; s4, carrying out secondary cold rolling after decarburization annealing, and then carrying out cold coating of a magnesium oxide separant; and S5, after cold coating of a magnesium oxide separant, high-temperature annealing, discharging, stretching, flattening and annealing are carried out. According to the method for improving the magnetic performance of the copper-containing oriented silicon steel, the magnetic induction intensity B8 of the copper-containing oriented silicon steel is not smaller than 1.9 T, the magnetic performance of the copper-containing oriented silicon steel is improved, the profit per ton of steel is increased, and the application range of the copper-containing oriented silicon steel is widened.

Description

technical field [0001] The invention relates to the technical field of the manufacture of grain-oriented silicon steel, in particular to a method for improving the magnetic properties of copper-containing grain-oriented silicon steel. Background technique [0002] In the field of grain-oriented silicon steel manufacturing, the size and phase of Gaussian grains are one of the main bases for judging the magnetic properties of grain-oriented silicon steel. The so-called Gaussian grain refers to the grain with {110}<001> single texture, which is called "HiB" in Japan and "COE" (cube-on-edge) in Europe and America. In order to obtain Gaussian grains with sufficiently accurate phase (the deviation angle from the rolling direction is less than 5°), it is necessary to rely on the inclusions in the steel to suppress the abnormal growth of the normal primary recrystallized grains, and make the number very small (the proportion is less than 5°). %) Gaussian grains grow abnormall...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/16C21D8/12C21D1/26C21D1/76C21D3/04
CPCC22C38/02C22C38/04C22C38/06C22C38/16C21D8/1255C21D8/1266C21D8/1283C21D8/1233C21D8/1222C21D8/1294C21D8/1244C21D1/26C21D1/76C21D3/04Y02P10/20
Inventor 陈嘉麟王雅楠王子航庄强
Owner NORTHWESTERN POLYTECHNICAL UNIV
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