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公开(公告)号：EP4032994A1
公开(公告)日：2022-07-27
申请号：EP20864727.1
申请日：2020-09-17
发明人： YASUDA, Masato , ARAMAKI, Takeo , YANO, Shinya , ARITA, Yoshihiro , KATAOKA, Takashi , MURAKAMI, Kenichi
摘要： [Problem] To provide a grain-oriented electrical steel sheet which is further improved in terms of iron loss before magnetic domain control, while achieving a sufficient iron loss improvement effect even in the control of a heat-resistant magnetic domain where a sufficient iron loss improvement effect has not been achieved. [Solution] A grain-oriented electrical steel sheet according to one aspect of the present invention comprises a base steel sheet and a glass coating that is formed on the surface of the base steel sheet, and is characterized in that: the base steel sheet contains as chemical components, in mass%, 0.010% or less of C, from 2.00% to 4.00% of Si, from 0.05% to 1.00% of Mn, from 0.010% to 0.065% of Al, 0.004% or less of N and 0.010% or less of S, with the balance being made up of Fe and impurities; the oxygen concentration in the glass coating and the base steel sheet is 2,500 ppm or less; and if I Al_1 is the first peak intensity of Al and I Al_2 is the second peak intensity of Al in the concentration profile of Al, the relationship of mathematical formula (1) is satisfied. Formula (1): I Al_1 Al_2
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公开(公告)号：EP3947755A1
公开(公告)日：2022-02-09
申请号：EP20713012.1
申请日：2020-03-26
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公开(公告)号：EP3943203A1
公开(公告)日：2022-01-26
申请号：EP20795076.7
申请日：2020-01-17
摘要： A method for producing a non-oriented electrical steel sheet used as an iron core material for a motor or a transformer and having excellent magnetic properties comprising subjecting a raw steel material having a component composition comprising, by mass%, C: not more than 0.005%, Si: 1.0 to 5.0%, Mn: 0.04 to 3.0%, sol. Al: not more than 0.005%, P: not more than 0.2%, S: not more than 0.005%, N: not more than 0.005% and the remainder being Fe and inevitable impurities to a hot rolling to form a hot-rolled sheet, subjecting the hot-rolled sheet to a hot-band annealing and to a single cold rolling or two or more cold rollings including an intermediate annealing between each rolling to form a cold-rolled sheet having a final sheet thickness and subjecting the cold-rolled sheet to a finish annealing, in which at least one pass in the final cold rolling of the cold rolling is a rolling at a friction coefficient µ of not less than 0.030 and a rolling reduction of not less than 15%.
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公开(公告)号：EP3922754A1
公开(公告)日：2021-12-15
申请号：EP20753188.0
申请日：2020-02-07
摘要： A grain oriented electrical steel sheet includes a base steel sheet, an oxide layer, and a tension-insulation coating. When a glow discharge spectroscopy is conducted in a region from a surface of the tension-insulation coating to an inside of the base steel sheet, a sputtering time Fe 0.5 at which a Fe emission intensity becomes 0.5 times as compared with a saturation value thereof and a sputtering time Fe 0.05 at which a Fe emission intensity becomes 0.05 times as compared with the saturation value satisfy 0.01 0.5 - Fe 0.05 ) / Fe 0.5
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公开(公告)号：EP3922737A1
公开(公告)日：2021-12-15
申请号：EP20753008.0
申请日：2020-02-07
摘要： A grain oriented electrical steel sheet includes a base steel sheet, an oxide layer, and a tension-insulation coating. When a glow discharge spectroscopy is conducted in a region from a surface of the tension-insulation coating to an inside of the base steel sheet, a sputtering time Fe 0.5 at which a Fe emission intensity becomes 0.5 times as compared with a saturation value thereof and a sputtering time Fe 0.05 at which a Fe emission intensity becomes 0.05 times as compared with the saturation value satisfy (Fe 0.5 - Fe 0.05 ) / Fe 0.5 ≥ 0.35. A maximal point of a Cr emission intensity is included between the Fe 0.05 and the Fe sat . Moreover, a magnetic flux density B8 in a rolling direction of the grain oriented electrical steel sheet is 1.90 T or more.
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公开(公告)号：EP3921454A1
公开(公告)日：2021-12-15
申请号：EP20702148.6
申请日：2020-02-04
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公开(公告)号：EP3916113A1
公开(公告)日：2021-12-01
申请号：EP20745534.6
申请日：2020-01-22
发明人： OKUBO Tomoyuki , TANAKA Takaaki , ZAIZEN Yoshiaki , ODA Yoshihiko
摘要： In a production of a non-oriented electrical steel sheet comprising subjecting a slab containing, as mass%, C: not more than 0.0050%, Si: 3. 2 to 5.0%, Mn: not more than 2.0%, P: not more than 0.02%, S: not more than 0.0050%, Al: 0.5 to 2.0% and N: not more than 0.0050%, provided that Si + Al ≥ 4.0%, to a hot rolling, a hot-band annealing, a cold rolling to form a cold-rolled sheet with a final sheet thickness and a finish annealing, a rolling reduction of a final finish rolling pass in the hot rolling is not less than 10%, and a coiling temperature is not higher than 620°C, and a soaking temperature in the finish annealing is 600 to 800°C to achieve such properties that a recrystallization ratio is less than 100% as an area ratio, a strength C is not less than 2.0 and a strength difference C-D is not more than 2.0, where C is a strength at Φ= 0° and ϕ 1 = 0° and D is a strength at Φ= 20° and ϕ 1 = 0° in a section of ϕ 2 = 45° of ODF obtained in a central layer of a sheet thickness, whereby a non-oriented electrical steel sheet having a high strength and a low iron loss is obtained.
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公开(公告)号：EP3913096A1
公开(公告)日：2021-11-24
申请号：EP20742060.5
申请日：2020-01-16
摘要： A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH 2 O/PH 2 is controlled, a final annealing process where hydrogen in mixed gas atmosphere is controlled to 50 volume% or more, an annealing separator removing process where water-washing is conducted using solution with inhibitor, a smoothing process where mixed gas and temperature are controlled for annealing, and an insulation coating forming process where a baking temperature and a heat treatment temperature are controlled.
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公开(公告)号：EP3913093A1
公开(公告)日：2021-11-24
申请号：EP20741886.4
申请日：2020-01-16
摘要： A method for manufacturing a grain-oriented electrical steel sheet includes: a silicon steel material production process of producing a silicon steel material; a hot rolling process of obtaining a hot rolled sheet by subjecting the silicon steel material to hot rolling; a cold rolling process of obtaining a steel sheet of a final sheet thickness by subjecting the hot rolled sheet to a single cold rolling process or multiple cold rolling processes having intermediate annealing performed between the cold rolling processes; a decarburization annealing process of subjecting the steel sheet to decarburization annealing; and a final annealing process of applying an annealing separator containing alumina as a main component to the steel sheet and subjecting the steel sheet to final annealing. The silicon steel material contains: in terms of mass%, Si: 0.8 to 7.0%; C: 0.085% or less; acid-soluble Al: 0.010 to 0.065%; N: 0.004 to 0.012%; Mn: 1.00% or less; S: 0.050% or less; a total of 0.01 to 0.20% of one or both of Sn and Sb; and the remainder: Fe and impurities.
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公开(公告)号：EP3913090A1
公开(公告)日：2021-11-24
申请号：EP20741723.9
申请日：2020-01-16
摘要： A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH 2 O/PH 2 is controlled, an annealing separator applying process where a mass ratio of MgO and MCI in an annealing separator is controlled, a final annealing process where an oxidation degree is controlled when atmosphere includes hydrogen or a dew point is controlled when atmosphere consists of inert gas without hydrogen, and an insulation coating forming process where a baking temperature and a heat treatment temperature are controlled.
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