Manufacturing method of mirror surface oriented silicon steel with good magnetic performance and annealing parting agent
A technology for annealing separator and oriented silicon steel, applied in the field of annealing separator and mirror oriented silicon steel manufacturing, it can solve the problems of limited core loss effect, unstable secondary recrystallization, surface corrosion of steel plate, etc., and achieve excellent magnetic properties and punching. performance effect
A technology for annealing separator and oriented silicon steel, applied in the field of annealing separator and mirror oriented silicon steel manufacturing, it can solve the problems of limited core loss effect, unstable secondary recrystallization, surface corrosion of steel plate, etc., and achieve excellent magnetic properties and punching. performance effect
CN103014285AActive Publication Date: 2013-04-03BAOSHAN IRON & STEEL CO LTD
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[0030] The present invention will be further described below in conjunction with embodiment.
[0031] Using a 500kg vacuum furnace to make steel, the chemical composition (wt%) of the slab is: 0.045%C, 3.25%Si, 0.006%S, 0.027%Als, 0.006%N, 0.15%Cu, 0.012%Mn, the rest is Fe and unavoidable of impurities. After the billet is heated at 1150°C, it is hot-rolled into a hot-rolled plate with a thickness of 2.6mm. 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 0.285 mm. The cold-rolled sheet is decarburized and annealed at 835°C for 120 seconds, and the surface oxygen content is 1.0 and 2.0g / m 2 Two levels; after nitriding treatment, the nitrogen content of the steel plate is 250ppm. The decarburized annealed sheet is coated with annealing release agent, and the composition ratio is shown in Table 1. After coiling, it is annealed at 1200°C and held for 20 hours in a dry nitrogen and hydrogen...
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Abstract
The invention discloses a manufacturing method of mirror surface oriented silicon steel with good magnetic performance and an annealing parting agent. The manufacturing method comprises the following steps of: 1) smelting; 2) hot rolling and normalizing; 3) cold rolling; 4) decarbonization and nitriding; and 5) parting agent coating and high-temperature annealing. The annealing parting agent comprises the following components in parts by mass: 65-96 parts of Al2O3 powder, 2-15 parts of silicate powder with a particle size of 0.1-100 microns, 1-10 parts of alkaline earth metal oxide and 1-10 parts of metal chloride. According to the invention, through the annealing parting agent consisting of Al2O3 powder, silicate powder, alkaline earth metal oxide and metal chloride, a glass film bottom layer is not formed on the surface of a steel plate in a high-temperature annealing process, and the steel can be effectively purified; and meanwhile, the embedded oxide on the near surface of a substrate is removed through the corrosion reaction of chloride so as to obtain a product with a smooth and clean surface and stable magnetic performance.
Description
technical field [0001] The invention relates to a method for manufacturing oriented silicon steel, in particular to a method for manufacturing a mirror-oriented silicon steel with excellent magnetic properties and an annealing separator. Background technique [0002] After the oriented silicon steel is hot rolled, normalized and cold rolled, it must be 2 -N 2 Decarburization annealing is carried out under the protection of the atmosphere to eliminate rolling stress and form primary recrystallization. At the same time, moisture is passed into the furnace to control the carbon content in the steel strip below 30ppm to prevent magnetic aging of the finished product. During decarburization annealing, the surface of the steel strip will be oxidized to form SiO 2 and Fe 2 SiO 4 The main oxide layer has an adverse effect on further decarburization. During the subsequent high-temperature annealing process, the oxide layer chemically reacts with the annealing separator coated on...
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Patent Timeline
03 Apr 2013
Publication
CN103014285A
- IPC
- C21D8/12; C21D1/68; C21D1/26; C21D9/46
- Inventors
- 赵自鹏; 吉亚明