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Glass-film-free oriented silicon steel manufacture method and annealing isolation agent

A technology of annealing release agent and oriented silicon steel, which is applied in the field of glass-free oriented silicon steel manufacturing and annealing release agent. secondary recrystallization, guaranteed decarburization efficiency, and improved nitriding efficiency

Active Publication Date: 2013-03-06
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is often difficult to completely brush off the magnesium silicate on the surface to obtain a product with a smooth surface, and this method cannot completely eliminate the oxide inclusions near the surface of the steel plate
[0011] Japanese patent JP08269560A adds chloride to magnesia as an annealing separator. Adding a large amount of chloride will cause certain corrosion on the surface of the steel plate during the secondary recrystallization annealing process, affect the surface inhibitor, and cause secondary recrystallization to be unstable.

Method used

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  • Glass-film-free oriented silicon steel manufacture method and annealing isolation agent
  • Glass-film-free oriented silicon steel manufacture method and annealing isolation agent
  • Glass-film-free oriented silicon steel manufacture method and annealing isolation agent

Examples

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Embodiment 1

[0050] Steelmaking in a 500kg vacuum furnace, the chemical composition (Wt%) of the slab is: 0.051%C, 3.25%Si, 0.006%S, 0.028%Als, 0.006%N, 0.011%Mn, and the rest is Fe and unavoidable impurities. After the billet is heated at 1150°C, it is hot-rolled into a 2.5mm thick hot-rolled plate. After the hot-rolled sheet is normalized and annealed at 1150°C for 1 minute, it is pickled and cold-rolled to a final sheet thickness of 0.225 mm. The oxidation energy of cold-rolled sheet p(H 2 O) / p(H 2 ) is 0.152 and the temperature is 835 ° C under the conditions of 120 seconds of decarburization annealing treatment; followed by continuous nitriding treatment in a wet ammonia nitrogen hydrogen protection atmosphere. The decarburization annealing plate is coated with annealing release agent, and after being coiled, it is annealed at 1200°C for 20 hours in a dry nitrogen-hydrogen protective atmosphere, and the atmosphere in the heating section is 75% N 2 +25%H 2 , the high insulation sec...

Embodiment 2

[0058] Steelmaking in a 500kg vacuum furnace, the chemical composition (Wt%) of the slab is: 0.051%C, 3.25%Si, 0.006%S, 0.028%Als, 0.006%N, 0.011%Mn, and the rest is Fe and unavoidable impurities. After the billet is heated at 1150°C, it is hot-rolled into a 2.5mm thick hot-rolled plate. After the hot-rolled sheet is normalized and annealed at 1150°C for 1 minute, it is pickled and cold-rolled to a final sheet thickness of 0.225 mm. The cold-rolled sheet is decarburized and annealed at 835°C for 120 seconds; then the nitrogen and hydrogen mixed with wet ammonia pass through the oxidation energy to be nitriding. The coating composition of the decarburized annealed plate is 80 parts Al 2 o 3 +20 parts of MgO+2 parts of BiOCl annealing separator, after coiling, perform high-temperature annealing at 1200°C in a dry nitrogen and hydrogen protective atmosphere and hold for 20 hours. The atmosphere in the heating section is nitrogen-hydrogen mixed gas, and the high holding section ...

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Abstract

The invention discloses a glass-film-free oriented silicon steel manufacture method. The method comprises the following steps of: (1) smelting; (2) hot rolling and normalizing; (3) cold rolling; (4) decarburization and nitriding, wherein a cold-rolled sheet is subjected to decarburization annealing treatment in wet N2+H2 protective gas at 800 to 860 DEG C, and oxidation energy is controlled within 0.16 to 0.40; carbon in the steel sheet can be reduced to below 30ppm by the decarburization annealing treatment while an oxide layer mainly containing SiO2 is formed on the surface of the steel sheet, and the single-side oxygen content of the steel sheet is controlled to below 0.7g / m<2>; and continuous nitriding treatment is carried out on the steel sheet in ammonia-contained N2+H2 protective gas with oxidation energy of 0.05 to 0.15 to control the nitrogen content of the steel sheet within 180ppm to 280ppm; (5) application of an isolation agent; (6) high-temperature annealing and temperature rising and maintenance, wherein the steel sheet is heated to 1150 to 1250 DEG C in dry N2+H2 mixed atmosphere containing 50% to 90% of N2 and H2, is maintained at the 1150 to 1250 DEG C in pure hydrogen atmosphere for above 15 hours; and (7) coating of an insulation coating, stretching, leveling and annealing, thus obtaining the grain-oriented silicon steel product with an excellent magnetic property.

Description

technical field [0001] The invention relates to a method for manufacturing oriented silicon steel, in particular to a method for manufacturing oriented silicon steel without a glass film and an annealing separator. Background technique [0002] In the production of grain oriented silicon steel, the steel plate needs to be in wet H 2 -N 2 Continuous decarburization annealing is carried out in a protective atmosphere. The purpose is to reduce the carbon in the steel plate to below 30ppm, so as to prevent the magnetic aging of the finished product. During the decarburization annealing process, the surface of the steel plate is formed with SiO 2 and Fe 2 SiO 4 The main oxide layer, during the secondary recrystallization annealing process, undergoes a solid-state diffusion reaction with the magnesium oxide coated on the surface of the steel plate: 2MgO+SiO 2 →Mg 2 SiO 4 , forming the bottom layer of magnesium silicate glass film. The bottom layer of magnesium silicate gl...

Claims

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Application Information

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IPC IPC(8): C21D1/68C22C38/06
Inventor 吉亚明杨勇杰李国保赵自鹏许云鹏李登峰
Owner BAOSHAN IRON & STEEL CO LTD
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