Method for manufacturing high silicon grain-oriented electrical steel sheet with superior core loss property
A technology of grain orientation and electrical steel plate, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., to achieve the effect of excellent iron loss performance
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Embodiment approach 1
[0050] Each containing Si: 3.05wt%, C: 0.046wt%, P: 0.015wt%; molten aluminum: 0.026wt%, N: 0.0073wt%, S: 0.005wt%, Mn: 0.11wt%, Cu: 0.12wt% %, with the balance being iron and unavoidable impurities, the slab is reheated at 1190°C, and then hot-rolled, annealed and pickled at a temperature lower than 1190°C. After that, the hot-rolled steel sheet is cold-rolled to obtain a thickness of 0.20-0.30 mm. The 0.20mm thick steel plate was additionally hot-rolled and annealed during rolling to ensure the final cold-rolling ratio. Decarburization annealing was performed on the cold-rolled steel sheet at 880° C. in a humid atmosphere containing nitrogen and hydrogen mixed gas to control the residual carbon content, and at the same time, a decarburization annealed steel sheet with a total surface oxygen content of 610 ppm was obtained.
[0051] Next, an annealing separator was coated on one of the cold-rolled steel sheets obtained above to manufacture a grain-oriented electrical steel s...
Embodiment approach 2
[0061] Each containing Si: 3.20wt%, C: 0.045wt%, P: 0.014wt%; molten aluminum: 0.027wt%, N: 0.0075wt%, S: 0.005wt%, Mn: 0.10wt%, Cu: 0.12wt% %, the balance is iron and unavoidable impurities, the steel billet is reheated at 1150°C, and then hot-rolled, annealed and pickled at a temperature lower than 1100°C. Thereafter, the hot-rolled steel sheet was cold-rolled to obtain a final thickness of 0.23 mm. Then decarburize the cold-rolled steel sheet at an annealing temperature of 880° C. in a humid atmosphere containing nitrogen and hydrogen to obtain a decarburized annealed steel sheet.
[0062] Next, 25 parts by weight of Fe-Si based sintered powder having -325 mesh and containing 50% Si were mixed with 100 parts by weight of MgO, and the mixture was dispersed in water to obtain a slurry siliconized composition. The above siliconized composition was coated on the surface of the decarburized annealed steel sheet with a roll coater. Afterwards, the steel sheets are dried and coi...
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