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Carbon elimination process for non-oriented silicon steel production

A technology of oriented silicon steel and decarburization, applied in the field of improvement of silicon steel production process

Active Publication Date: 2009-04-29
新万鑫(福建)精密薄板有限公司
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Problems solved by technology

For this reason, people constantly propose improvement schemes of related technologies, such as Chinese Patent No. CN200710068744.7 on "Decarburization Technology and Equipment for Steel Strip Lead Bath Quenching and Tempering Production Line", which is in the process of continuous quenching and heating of steel strips. The protective gas is humidified so that the protective gas contains a certain amount of water vapor, and the oxygen in the hot steam is used to oxidize the carbon in the surface layer of the steel strip to achieve the purpose of decarburization on the surface of the steel strip. This technology is applied to the steel strip lead bath quenching Tempering production line, to achieve the goal of decarburization on the surface of the steel strip, to obtain a decarburization layer with a thickness of 5 microns on the surface of the steel strip, to improve the plasticity of the steel strip, so that the steel strip can withstand 180° bending, but the quality of this product needs further improvement improve and improve

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  • Carbon elimination process for non-oriented silicon steel production

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Embodiment Construction

[0008] It can be seen from the figure that first, the silicon steel coils (1) cold-rolled at room temperature are uncoiled, and then they are stacked in a bell annealing furnace (2), and then a thick-walled and high-temperature-resistant stainless steel inner cover (3) is used. Cover the silicon steel coil (1), then buckle the improved heating mantle (4) outside the inner cover (3), fill the inner cover (3) with nitrogen to carry out "catch-up" treatment, that is, replace the air with nitrogen, according to The process requires heating the silicon steel coil (1) to 800-850°C under different atmospheres in several stages and keeping the temperature constant. Carbon diffuses to the surface at high temperature and reacts chemically with water vapor. In the bell-type annealing furnace (2), because the flow direction of the gas in the furnace is toward the bottom of the hearth, it is easy to discharge the carbon monoxide gas and water formed by the decarburization reaction together,...

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Abstract

The invention discloses a decarbonization process for producing non-oriented silicon steel. The method adopts a water-based quantified decarbonization hood type bright annealing furnace. 20 to 30 percent of hydrogen gas and 70 to 80 percent of nitrogen gas enter the furnace through a warm water humidifier together with water vapor. The ratio of the water vapor differential pressure to the hydrogen gas differential pressure in the furnace is kept 0.2 to 0.5; and multistage heating is carried out so as to reach the temperature of 800 to 850 DEG C. In the weakly oxidizing atmosphere, the water vapor is used for quick decarbonization; and the decarbonization time is controlled between 12 and 15 hours. The decarbonization process for producing the non-oriented silicon steel has good effects and high efficiency, and can remarkably improve the product quality.

Description

Technical field [0001] The invention relates to an improvement of a silicon steel production process, which is mainly used in the production of non-oriented silicon steel. technical background [0002] Non-oriented silicon steel is widely used in industry, and its performance requirements are getting higher and higher. It is required that the content of carbon element should be as low as possible, because carbon will form interstitial solid solution with iron, which will cause serious lattice distortion and increase internal stress. Magnetism drops. For this reason, people constantly propose the improvement plan of relevant technology, such as Chinese patent CN200710068744.7 about "decarburization technology and equipment of steel strip lead bath quenching and tempering production line", it is in the process of continuous quenching and heating of steel strip, through the The protective gas is humidified so that the protective gas contains a certain amount of water vapor, an...

Claims

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Application Information

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IPC IPC(8): C21D3/04
Inventor 张维林翁鑫魏智强潘智光陈宝贤
Owner 新万鑫(福建)精密薄板有限公司
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