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1. 发明申请

US20130340899A1 STEEL SHEET FOR HOT STAMPING USE, METHOD OF PRODUCTION OF SAME, AND METHOD OF PRODUCTION OF HIGH STRENGTH PART 审中-公开
标题翻译：用于烫印用途的钢板，其生产方法和生产高强度部件的方法
公开(公告)号：US20130340899A1
公开(公告)日：2013-12-26
申请号：US14003881
申请日：2011-03-09
申请人： Kazuhisa Kusumi , Yuji Ogawa , Masayuki Abe , Hidekuni Murakami , Kengo Takeda , Jun Maki
发明人： Kazuhisa Kusumi , Yuji Ogawa , Masayuki Abe , Hidekuni Murakami , Kengo Takeda , Jun Maki
IPC分类号： C22C38/22 , C22C38/32 , C22C38/04 , B21B1/22 , C22C38/06 , C22C38/02 , C22C38/00 , C21D8/00 , C22C38/28 , C22C38/14
CPC分类号： C22C38/02 , B21B1/22 , B21D22/022 , B32B15/013 , C21D6/005 , C21D8/005 , C21D8/0226 , C21D8/0236 , C21D8/0273 , C22C38/001 , C22C38/002 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/24 , C22C38/28 , C22C38/30 , C22C38/32
摘要： The present invention has as its object the provision of steel sheet for hot stamping use which is excellent in part strength after hot stamping and delayed fracture resistance comprised of large C content high strength steel sheet in which effective hydrogen traps are formed in the steel material.The steel sheet of the present invention solves this problem by forming Fe—Mn-based composite oxides in the steel sheet and trapping hydrogen at the interfaces of the composite oxides and matrix steel and in the voids around the composite oxides.Specifically, it provides steel sheet for hot stamping use which is comprised of chemical ingredients which contain, by mass %, C: 0.05 to 0.40%, Si: 0.02% or less, Mn: 0.1 to 3%, S: 0.02% or less, P: 0.03% or less, Al: 0.005% or less, Ti: 0.01% or less, N: 0.01% or less, one or both of Cr and Mo in a total of 0.005 to 1%, and O: 0.003 to 0.03% and which have a balance of Fe and unavoidable impurities and which contains average diameter 0.1 to 15 μm Fe—Mn-based composite oxide particles dispersed in the steel sheet or furthermore has crushed voids around the composite oxide particles, a method of production of the same, and a method of production of a hot stamped high strength part.
摘要翻译：本发明的目的是提供一种热冲压用钢板，其特征在于，在钢材中形成有效的氢气阱的大型C含量高强度钢板的热冲压后具有优异的部分强度和延迟断裂性。本发明的钢板通过在钢板中形成Fe-Mn系复合氧化物并在复合氧化物和基质钢的界面以及复合氧化物周围的空隙中捕获氢来解决这个问题。具体地说，提供热冲压用钢板，其由以质量％计含有C：0.05〜0.40％，Si：0.02％以下，Mn：0.1〜3％，S：0.02％以下的化学成分构成，P：0.03％以下，Al：0.005％以下，Ti：0.01％以下，N：0.01％以下，Cr和Mo中的一种或两种，总计0.005〜1％，O：0.003〜 0.03％，余量由Fe和不可避免的杂质构成，平均直径为0.1〜15μm的Fe-Mn系复合氧化物粒子分散在钢板上，或者还具有复合氧化物粒子周围的破碎空隙。以及生产热冲压高强度部件的方法。

2. 发明授权

US07736449B2 High-strength hot-dip galvanized steel sheet and method for producing the same 有权
标题翻译：高强度热浸镀锌钢板及其制造方法
公开(公告)号：US07736449B2
公开(公告)日：2010-06-15
申请号：US11977537
申请日：2007-10-24
申请人： Yoshihisa Takada , Masayoshi Suehiro , Masao Kurosaki , Hidekuni Murakami , Hiroyasu Fujii , Haruhiko Eguchi , Hisaaki Sato
发明人： Yoshihisa Takada , Masayoshi Suehiro , Masao Kurosaki , Hidekuni Murakami , Hiroyasu Fujii , Haruhiko Eguchi , Hisaaki Sato
IPC分类号： C23C2/28
CPC分类号： C22C38/02 , C21D1/185 , C21D1/74 , C21D8/0273 , C21D8/0278 , C21D9/46 , C22C38/008 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/16 , C23C2/02 , C23C2/40 , Y10T29/301 , Y10T428/12799 , Y10T428/12951
摘要： The present invention stably provides a high-strength hot-dip galvanized steel sheet having a high tensile strength and no non-plated portions and being excellent in workability and surface properties even when the employed equipment has only a reduction annealing furnace and a steel sheet containing relatively large amounts of Si, Mn and Al that are regarded as likely to cause non-plated portions is used as the substrate. The present invention: secures good plating performance even when the steel sheet contains Si, Mn and Al by adding Ni to a steel sheet, thus forming oxides at some portions in the steel sheet surface layer, and resultantly suppressing the surface incrassation of Si, Mn and Al at the portions where oxides are not formed; enhances the effect of Ni and accelerates the formation of oxides by further adding Mo, Cu and Sn; and moreover, in the case of a TRIP steel sheet, secures austenite by determining the ranges of Si and Al strictly, avoiding the deterioration of plating performance caused by the addition of Ni, and further adding Mo in a balanced manner.In addition, the present invention, in a TRIP steel sheet, improves press formability by regulating a retained austenite ratio and accelerates the formation of oxides by regulating a hydrogen concentration and a dew point in annealing before plating.
摘要翻译：本发明稳定地提供了具有高拉伸强度和无镀层部分的高强度热浸镀锌钢板，并且即使所用设备仅具有还原退火炉和含有被认为可能引起非电镀部分的相对大量的Si，Mn和Al被用作衬底。本发明：即使在钢板中含有Si，Mn和Al的钢板中也添加了Ni，从而在钢板表面层的某些部分形成氧化物，也可以确保良好的镀层性，从而抑制Si，Mn 和Al在不形成氧化物的部分; 通过进一步添加Mo，Cu和Sn，增强Ni的作用并加速氧化物的形成; 此外，在TRIP钢板的情况下，通过严格地确定Si和Al的范围来确保奥氏体，避免由于添加Ni而引起的电镀性能的劣化，并且进一步以平衡的方式添加Mo。此外，本发明在TRIP钢板中，通过调节残留奥氏体比例，通过调节镀层前退火时的氢浓度和露点来促进氧化物的形成，提高冲压成形性。

3. 发明申请

US20060124907A1 High-strength hop-dip galvanized steel sheet and method for producing the same 有权
标题翻译：高强度浸镀锌钢板及其制造方法
公开(公告)号：US20060124907A1
公开(公告)日：2006-06-15
申请号：US10542393
申请日：2004-01-15
申请人： Yoshihisa Takada , Masayoshi Suehiro , Masao Kurosaki , Hidekuni Murakami , Hiroyasu Fujii , Haruhiko Eguchi , Hisaaki Sato
发明人： Yoshihisa Takada , Masayoshi Suehiro , Masao Kurosaki , Hidekuni Murakami , Hiroyasu Fujii , Haruhiko Eguchi , Hisaaki Sato
IPC分类号： H01B1/12
CPC分类号： C22C38/02 , C21D1/185 , C21D1/74 , C21D8/0273 , C21D8/0278 , C21D9/46 , C22C38/008 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/16 , C23C2/02 , C23C2/40 , Y10T29/301 , Y10T428/12799 , Y10T428/12951
摘要： The present invention stably provides a high-strength hot-dip galvanized steel sheet having a high tensile strength and no non-plated portions and being excellent in workability and surface properties even when the employed equipment has only a reduction annealing furnace and a steel sheet containing relatively large amounts of Si, Mn and Al that are regarded as likely to cause non-plated portions is used as the substrate. The present invention: secures good plating performance even when the steel sheet contains Si, Mn and Al by adding Ni to a steel sheet, thus forming oxides at some portions in the steel sheet surface layer, and resultantly suppressing the surface incrassation of Si, Mn and Al at the portions where oxides are not formed; enhances the effect of Ni and accelerates the formation of oxides by further adding Mo, Cu and Sn; and moreover, in the case of a TRIP steel sheet, secures austenite by determining the ranges of Si and Al strictly, avoiding the deterioration of plating performance caused by the addition of Ni, and further adding Mo in a balanced manner. In addition, the present invention, in a TRIP steel sheet, improves press formability by regulating a retained austenite ratio and accelerates the formation of oxides by regulating a hydrogen concentration and a dew point in annealing before plating.
摘要翻译：本发明稳定地提供了具有高拉伸强度和无镀层部分的高强度热浸镀锌钢板，并且即使所用设备仅具有还原退火炉和含有被认为可能引起非电镀部分的相对大量的Si，Mn和Al被用作衬底。本发明：即使在钢板中含有Si，Mn和Al的钢板中也添加了Ni，从而在钢板表面层的某些部分形成氧化物，也可以确保良好的镀层性，从而抑制Si，Mn 和Al在不形成氧化物的部分; 通过进一步添加Mo，Cu和Sn，增强Ni的作用并加速氧化物的形成; 此外，在TRIP钢板的情况下，通过严格地确定Si和Al的范围来确保奥氏体，避免由于添加Ni而引起的电镀性能的劣化，并且进一步以平衡的方式添加Mo。此外，本发明在TRIP钢板中，通过调节残留奥氏体比例，通过调节镀层前退火时的氢浓度和露点来促进氧化物的形成，提高冲压成形性。

4. 发明申请

US20120067469A1 VERY THIN STEEL SHEET AND PRODUCTION METHOD THEREOF 有权
标题翻译：非常薄的钢板及其生产方法
公开(公告)号：US20120067469A1
公开(公告)日：2012-03-22
申请号：US13321108
申请日：2010-05-17
申请人： Hidekuni Murakami , Seiichi Tanaka , Keiichiroh Torisu , Akihiro Jinno
发明人： Hidekuni Murakami , Seiichi Tanaka , Keiichiroh Torisu , Akihiro Jinno
IPC分类号： C21D8/02 , C22C38/00 , C22C38/14 , C22C38/06 , C22C38/12 , C22C38/02 , C22C38/04
CPC分类号： C21D9/46 , C21D9/56 , C21D2201/03 , C21D2211/004 , C22C38/001 , C22C38/004 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14
摘要： The present invention provides a very thin steel sheet and production method thereof that, in a very thin steel sheet of 0.4 mm or less thickness, enable production at low addition of special elements, simultaneous achievement of both good workability and anti-aging property, and stable passing of even wide coil in a continuous annealing process, which very thin steel sheet and production method.
摘要翻译：本发明提供一种非常薄的钢板及其制造方法，其特征在于，在厚度为0.4mm以下的非常薄的钢板中，能够以低添加量的特殊元素生产，同时实现良好的加工性和抗老化性，连续退火工艺中均匀的线圈稳定通过，这种非常薄的钢板和生产方法。

5. 发明授权

US08097094B2 High-strength electrical steel sheet and processed part of same 有权
标题翻译：高强度电工钢板及其加工部分相同
公开(公告)号：US08097094B2
公开(公告)日：2012-01-17
申请号：US10574553
申请日：2004-10-06
申请人： Hidekuni Murakami
发明人： Hidekuni Murakami
IPC分类号： H01F1/147
CPC分类号： C22C38/004 , C21D8/1244 , C22C38/02 , C22C38/04 , C22C38/16 , H01F1/14775
摘要： The present invention has as its object to stably produce a high strength electrical steel sheet and a processed part of the same which is high in strength and has wear resistant and is superior in magnetic flux density and core loss without greatly changing the cold rollability and production processes from those of conventional electrical steel sheet and provides a high strength electrical steel sheet characterized by containing, by mass %, C: 0.06% or less, Si: 0.2 to 6.5%, Mn: 0.05 to 3.0%, P: 0.30% or less, S or Se: 0.040% or less, Al: 2.50% or less, Cu: 0.6 to 8.0%, N: 0.0400% or less, and a balance of Fe and unavoidable impurities and containing in the steel a metal phase composed of Cu of a size of 0.1 μm or less. The method of production of the same comprises holding in a temperature range of 300° C. to 720° C. for 5 seconds or more for heat treatment.
摘要翻译：本发明的目的是稳定地制造强度高且耐磨的高强度电磁钢板及其加工部件，并且磁通密度和磁芯损耗优异，而不会极大地改变冷轧性和生产性工序，提供一种高强度电工钢板，其特征在于以质量％计含有C：0.06％以下的Si：0.2〜6.5％，Mn：0.05〜3.0％，P：0.30％或少于S或Se：0.040％以下，Al：2.50％以下，Cu：0.6〜8.0％，N：0.0400％以下，余量由Fe和不可避免的杂质构成，在钢中含有由 Cu的尺寸为0.1μm以下。其制造方法包括在300℃〜720℃的温度范围内保持5秒以上进行热处理。

6. 发明申请

US20100158744A1 High strength electrical steel sheet and method of production of same 审中-公开
标题翻译：高强度电工钢板及其生产方法
公开(公告)号：US20100158744A1
公开(公告)日：2010-06-24
申请号：US12308346
申请日：2006-06-16
申请人： Hidekuni Murakami
发明人： Hidekuni Murakami
IPC分类号： C21D8/02 , C22C38/00 , C22C38/08 , C22C38/16 , C22C38/42 , C22C38/60 , C22C38/06 , C22C38/02 , C21D6/00
CPC分类号： C22C38/04 , C21D8/02 , C21D8/12 , C21D8/1216 , C21D8/1233 , C21D8/1244 , C21D8/1266 , C22C38/00 , C22C38/004 , C22C38/02 , C22C38/06 , C22C38/08 , C22C38/16 , C22C38/18 , C22C38/42 , H01F1/14775 , H01F1/16
摘要： The present invention has as its object the production of high strength electrical steel sheet, having a high strength of a tensile strength TS of for example 500 MPa or more, having wear resistance, and having superior magnetic properties of magnetic flux density and iron loss, that is, provides a method of production of high strength electrical steel sheet containing, by mass %, C: 0.060% or less, Si: 0.2 to 6.5%, Mn: 0.05 to 3.0%, P: 0.30% or less, S or Se: 0.040% or less, Al: 2.50% or less, N: 0.020% or less, and further one or more of Cu: 0.001 to 30.0% and Nb: 0.03 to 8.0% and having worked structures remaining inside the steel sheet, said method of production of high strength electrical steel sheet coarsening an average crystal grain size D (μm) of a sheet right before a step of forming the worked structures to finally remain inside the steel sheet to D≧20 μm, imparting strain in the final working step as a preferred process, then not performing any heat treatment causing the worked structures to disappear and high strength electrical steel sheet obtained by that method.
摘要翻译：本发明的目的是制造具有高抗拉强度TS（例如500MPa以上）的高强度电磁钢板，具有耐磨性，并具有优异的磁通密度和铁损的磁特性，即，提供以质量％计含有C：0.060％以下，Si：0.2〜6.5％，Mn：0.05〜3.0％，P：0.30％以下的高强度电工钢板的制造方法，S或 Se：0.040％以下，Al：2.50％以下，N：0.020％以下，Cu：0.001〜30.0％，Nb：0.03〜8.0％中的一种以上，残留在钢板内部，所述高强度电工钢板的制造方法，在形成加工结构的工序之前将片材的平均晶粒尺寸D（μm）粗大化，最终保留在钢板内至D≥20μm，在最终工作步骤作为优选工艺，然后不进行任何热处理 e加工结构消失，并通过该方法获得高强度电工钢板。

7. 发明授权

US06478892B2 Low iron loss non-oriented electrical steel sheet excellent in workability and method for producing the same 有权
标题翻译：作业性优良的低铁损无取向电工钢板及其制造方法
公开(公告)号：US06478892B2
公开(公告)日：2002-11-12
申请号：US09827968
申请日：2001-04-06
申请人： Ken-ichi Murakami , Takashi Morohoshi , Tomoji Kumano , Ryutaro Kawamata , Takeshi Kubota , Masafumi Zeze , Hidekuni Murakami , Shinichi Kanao
发明人： Ken-ichi Murakami , Takashi Morohoshi , Tomoji Kumano , Ryutaro Kawamata , Takeshi Kubota , Masafumi Zeze , Hidekuni Murakami , Shinichi Kanao
IPC分类号： H01F104
CPC分类号： C21D8/12 , C21D8/1261 , C21D8/1272
摘要： The present invention provides a non-oriented electrical steel sheet having crystal grains of small diameter and excellent workability before stress relief annealing and having crystal grains of largely grown diameter and excellent iron loss property after stress relief annealing and a method for producing the same, and relates to a low iron loss non-oriented electrical steel sheet excellent in workability, containing, in weight %, 0.010% or less of C, 0.1 to 1.5% of Mn, 0.1 to 4% of Si, 0.1 to 4% of Al, wherein the latter three elements satisfy the formula Si+Mn+Al≦5.0%, and 0.0005 to 0.0200% of Mg, or further containing 0.005% or more of Ca, wherein the total amount of Mg and Ca is 0.0200% or less, or further containing 0.005% or more of REM, wherein the total amount of Mg and REM is 0.0200% or less, or further containing 0.005% or more of Ca and REM, wherein the total amount of Mg, Ca and REM is 0.0200% or less, and containing the remainder consisting of Fe and unavoidable impurities.
摘要翻译：本发明提供一种在应力消除退火之前具有直径小的晶粒和可加工性优异的无取向电工钢板，其具有大直径生长的晶粒和应力消除退火后的优异的铁损性能及其制造方法，涉及加工性优异的低铁损无取向电工钢板，其含量为C：0.010％以下，Mn：0.1〜1.5％，Si：0.1〜4％，Al：0.1〜4％其中后三种元素满足式Si + Mn + Al <= 5.0％，Mg：0.0005〜0.0200％，进一步含有0.005％以上的Ca，其中Mg和Ca的总量为0.0200％以下，或进一步含有0.005％以上的REM，其中Mg和REM的总量为0.0200％以下，或进一步含有0.005％以上的Ca和REM，其中Mg，Ca和REM的总量为0.0200％，或较少，含有余量由Fe和不可避免的impuriti组成 es。

8. 发明授权

US5486241A Non-aging at room temperature ferritic single-phase cold-rolled steel sheet and hot-dip galvanized steel sheet for deep drawing having excellent fabrication embrittlement resistance and paint-bake hardenability and process for producing the same 失效
标题翻译：室温下的非老化铁素体单相冷轧钢板和用于深拉伸的热浸镀锌钢板具有优异的制造抗脆性和油漆烘烤淬透性及其制备方法
公开(公告)号：US5486241A
公开(公告)日：1996-01-23
申请号：US240782
申请日：1994-06-29
申请人： Kohsaku Ushioda , Naoki Yoshinaga , Yoshikazu Matsumura , Osamu Akisue , Kunio Nishimura , Hidekuni Murakami
发明人： Kohsaku Ushioda , Naoki Yoshinaga , Yoshikazu Matsumura , Osamu Akisue , Kunio Nishimura , Hidekuni Murakami
IPC分类号： C21D8/04 , C22C38/32 , C23C2/02 , C22C38/06 , C21D8/02
CPC分类号： C22C38/32 , C21D8/0426 , C23C2/02 , C21D2211/005 , C21D8/0436 , C21D8/0473
摘要： The present invention provides a non-aging at room temperature ferritic single-phase cold-rolled steel sheet or hot-dip galvanized steel sheet for deep drawing and having excellent fabrication embrittlement resistance and paint-bake hardenability, by heating a slab comprising, in terms of % by weight, 0.0001 to 0.0015% of C, not more than 1.2% of Si, 0.03 to 3.0% of Mn, 0.01 to 0.15% of P, 0.0010 to 0.020% of S, 0.005 to 0.1% of Al, 0.0001 to 0.0080% of N and 0.0001 to 0.0030% of B and optionally 0.1 to 3% of Cr with the balance consisting of Fe and unavoidable impurities, hot-rolling the heated slab at a finishing temperature of not lower than (Ar.sub.3 --100).degree. C., cooling the hot-rolled coil within 1 sec after the hot rolling at a rate of not less than 50.degree. C./sec from the finishing temperature to a temperature in the range of from 600.degree. to 750.degree. C. and coiling the cooled strip in said temperature range, cold-rolling the coil with a reduction ratio of not lower than 60% and conducting continuous annealing or continuous hot-dip galvanizing in the temperature range of from 600.degree. to 900.degree. C.
摘要翻译： PCT No.PCT / JP93 / 01314 Sec。 371日期：1994年6月29日 102（e）日期1994年6月29日PCT提交1993年9月14日PCT公布。出版物WO94 / 06948 日本公开1994年3月31日。本发明提供了室温铁素体单相冷轧钢板或深拉深的热浸镀锌钢板的非老化性，并且具有优异的制造脆性和油漆烘烤淬透性，加热板坯，以重量％计，C：0.0001〜0.0015％，Si：1.2％以下，Mn：0.03〜3.0％，P：0.01〜0.15％，S：0.0010〜0.020％ 0.1％的Al，0.0001〜0.0080％的N，0.0001〜0.0030％的B和0.1〜3％的Cr，余量由Fe和不可避免的杂质构成，在不低于100℃的终轧温度下进行热轧（Ar3-100）℃，在热轧后1秒内以从终轧温度至少50℃/秒的速度将热轧板卷冷却至600〜 750℃，并在所述温度范围内卷取冷却的带材，以不低于t的压下率将线圈冷轧在60℃〜900℃的温度范围内进行连续退火或连续热浸镀锌。

9. 发明授权

US10344360B2 Steel sheet for hot stamping use, method of production of same, and method of production of high strength part 有权
公开(公告)号：US10344360B2
公开(公告)日：2019-07-09
申请号：US14003881
申请日：2011-03-09
申请人： Kazuhisa Kusumi , Yuji Ogawa , Masayuki Abe , Hidekuni Murakami , Kengo Takeda , Jun Maki
发明人： Kazuhisa Kusumi , Yuji Ogawa , Masayuki Abe , Hidekuni Murakami , Kengo Takeda , Jun Maki
IPC分类号： C22C38/04 , C22C38/06 , C22C38/22 , C22C38/02 , B21D22/02 , C22C38/00 , C22C38/32 , B21B1/22 , C21D8/00 , C22C38/14 , C22C38/28 , B32B15/01 , C22C38/12 , C22C38/16 , C22C38/24 , C22C38/30 , C21D6/00 , C21D8/02
摘要： The present invention has as its object the provision of steel sheet for hot stamping use which is excellent in part strength after hot stamping and delayed fracture resistance comprised of large C content high strength steel sheet in which effective hydrogen traps are formed in the steel material.The steel sheet of the present invention solves this problem by forming Fe—Mn-based composite oxides in the steel sheet and trapping hydrogen at the interfaces of the composite oxides and matrix steel and in the voids around the composite oxides.Specifically, it provides steel sheet for hot stamping use which is comprised of chemical ingredients which contain, by mass %, C: 0.05 to 0.40%, Si: 0.02% or less, Mn: 0.1 to 3%, S: 0.02% or less, P: 0.03% or less, Al: 0.005% or less, Ti: 0.01% or less, N: 0.01% or less, one or both of Cr and Mo in a total of 0.005 to 1%, and O: 0.003 to 0.03% and which have a balance of Fe and unavoidable impurities and which contains average diameter 0.1 to 15 μm Fe—Mn-based composite oxide particles dispersed in the steel sheet or furthermore has crushed voids around the composite oxide particles, a method of production of the same, and a method of production of a hot stamped high strength part.

10. 发明授权

US08557058B2 High-strength non-oriented electrical steel sheet 有权
标题翻译：高强度无取向电工钢板
公开(公告)号：US08557058B2
公开(公告)日：2013-10-15
申请号：US12309622
申请日：2007-06-15
申请人： Yoshihiro Arita , Hidekuni Murakami , Yutaka Matsumoto , Saori Haranaka , Takeshi Kubota
发明人： Yoshihiro Arita , Hidekuni Murakami , Yutaka Matsumoto , Saori Haranaka , Takeshi Kubota
IPC分类号： H01F3/00 , H01F1/04 , C22C38/00
CPC分类号： C22C38/02 , C21D8/12 , C21D8/1272 , C21D9/46 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , H01F1/14716 , H01F1/14791
摘要： The invention provides a non-oriented electrical steel sheet excellent in yield strength for use as an iron core material for high rpm motors that does not sacrifice yield or productivity in motor core punching or steel sheet production, which non-oriented electrical steel sheet is given a chemical composition of, in mass %, C: 0.01 to 0.05%, Si: 2.0 to 4.0%, Mn: 0.05 to 0.5%, Al: 3.0% or less and Nb: 0.01 to 0.05%, and optionally Ni at a preferable content of more than 0.5% and less than 3.0%, the balance being Fe and unavoidable impurities, Mn and C contents expressed in mass % are made to satisfy Mn≦0.6-10×C, recrystallized portion area fraction is made 50% or greater, yield strength in tensile testing is made 650 MPa or greater, and average-grain diameter viewed in steel sheet cross-section is made 40 μm or less, and electrical steel sheet production is conducted using a hot-rolled sheet whose transition temperature in impact testing is 70° C. or less.
摘要翻译：本发明提供一种用于高转速电机的铁心材料的屈服强度优异的无取向电工钢板，其不牺牲电动机芯冲孔或钢板生产中的产量或生产率，该方向电磁钢板被给予以质量％计含有C：0.01〜0.05％，Si：2.0〜4.0％，Mn：0.05〜0.5％，Al：3.0％以下，Nb：0.01〜0.05％的化学成分，含量超过0.5％且小于3.0％，余量为Fe和不可避免的杂质，以质量％表示的Mn和C含量满足Mn≤0.0〜10-10℃，再结晶部分面积分数为50％以上拉伸试验的屈服强度为650MPa以上，钢板截面的平均粒径为40μm以下，使用冲击转变温度的热轧板进行电工钢板的制造测试为70℃或更低。

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