公开(公告)号：US20140360631A1

公开(公告)日：2014-12-11

申请号：US14470143

申请日：2014-08-27

申请人： Nippon Steel & Sumitomo Metal Corporation

发明人： Hiroyuki TANAHASHI ,  Shinya SAITOH ,  Masashi FUKUDA ,  Hiroyuki OKADA ,  Kunio HAYASHI ,  Toshimasa TOMOKIYO ,  Nobuhiro FUJITA

IPC分类号： C21D8/02 ,  C22C38/16 ,  C22C38/14 ,  C22C38/00 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/38 ,  C22C38/12

CPC分类号： C21D8/0263 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/38 ,  C23C2/06

摘要： This high strength hot-rolled steel sheet includes: in terms of percent by mass, C: 0.05 to 0.12%; Si: 0.8 to 1.2%; Mn: 1.6 to 2.2%; Al: 0.30 to 0.6%; P: 0.05% or less; S: 0.005% or less; and N: 0.01% or less, with the remainder being Fe and unavoidable impurities, wherein a microstructure includes specific ranges (in area %) of ferrite phases as well as martensite phases, and a maximum concentration of Al detected by a glow discharge emission spectroscopic analysis is in a range of 0.75 mass % or less in a region from a surface of the steel sheet to a thickness of 500 nm after being acid-pickled.

摘要翻译： 该高强度热轧钢板包括：以质量％计，C：0.05〜0.12％; Si：0.8〜1.2％ Mn：1.6〜2.2％ Al：0.30〜0.6％ P：0.05％以下; S：0.005％以下; 和N：0.01％以下，其余为Fe和不可避免的杂质，其中微结构包括铁素体相的特定范围（面积％）以及马氏体相，并且通过辉光放电发射光谱法检测到的Al的最大浓度 在酸洗后，从钢板表面到厚度为500nm的区域，分析为0.75质量％以下。

公开(公告)号：US20170306434A1

公开(公告)日：2017-10-26

申请号：US15513130

申请日：2014-10-16

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Kengo TAKEDA ,  Toshimasa TOMOKIYO ,  Yasushi TSUKANO ,  Takashi ARAMAKI

IPC分类号： C21D9/46 ,  C21D6/00 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C22C38/58 ,  C23G1/08

CPC分类号： C21D9/46 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D2211/003 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23G1/081

摘要： A high-carbon steel sheet includes: a chemical composition represented by, in mass %, C: 0.30% to 0.70%, B: 0.0004% to 0.0035%, and others; and a structure represented by a spheroidized ratio of cementite: 80% or more; and an average diameter of cementite: 0.3 μm to 2.2 μm, wherein a coefficient of micro-friction of ferrite on a surface of the steel sheet is less than 0.5.

公开(公告)号：US20170067132A1

公开(公告)日：2017-03-09

申请号：US15123119

申请日：2015-03-09

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Kengo TAKEDA ,  Toshimasa TOMOKIYO ,  Yasushi TSUKANO ,  Takashi ARAMAKI

IPC分类号： C21D9/46 ,  C22C38/32 ,  C22C38/16 ,  C22C38/14 ,  C21D8/02 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/60 ,  C22C38/12

CPC分类号： C21D9/46 ,  C21D1/32 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0473 ,  C21D2201/05 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/003 ,  C21D2211/004 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/32 ,  C22C38/60

摘要： A middle/high carbon steel sheet according to an aspect of the present invention is a steel sheet, in which composition thereof contains, by mass %, C: 0.10% to 1.50%, Si: 0.01% to 1.00%, Mn: 0.01% to 3.00%, P: 0.0001% to 0.1000%, and S: 0.0001% to 0.1000%, and a remainder consisting of Fe and impurities, in which the steel sheet has a structure in which a total volume percentage of a martensite, a bainite, a pearlite, and a residual austenite is equal to or lower than 5.0%, and a remainder thereof is a ferrite and carbides, in which a spheroidizing ratio of carbide particles is 70% to 99%, and in which a proportion of a number of the carbide particles including a crystal interface at which an orientation difference is equal to or greater than 5° in the carbide particles is equal to or lower than 20% of a total number of the carbide particles.

摘要翻译： 本发明的中高碳钢板是以质量％计含有C：0.10〜1.50％，Si：0.01〜1.00％，Mn：0.01％的钢板， 至3.00％，P：0.0001％至0.1000％，S：0.0001％至0.1000％，余量由Fe和杂质组成，其中钢板具有马氏体，贝氏体的总体积百分比 ，珠光体和残留奥氏体等于或低于5.0％，其余部分是碳化物粒子的球化比为70％〜99％的铁素体和碳化物，其中， 包含在碳化物粒子中取向差为5°以上的结晶界面的碳化物粒子等于或低于碳化物粒子总数的20％。

公开(公告)号：US20160201154A1

公开(公告)日：2016-07-14

申请号：US14916299

申请日：2014-09-10

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Toshimasa TOMOKIYO ,  Shintaro YAMANAKA ,  Kengo TAKEDA ,  Satoshi NISHIMURA

IPC分类号： C21D8/02 ,  C22C38/26 ,  C22C38/20 ,  C21D9/46 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/60 ,  C22C38/06

CPC分类号： C21D9/46 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0284 ,  C21D9/56 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/26 ,  C22C38/60

摘要： A cold-rolled steel sheet for vitreous enameling has a predetermined chemical composition, in which a number density of Fe—Mn—Nb-based composite oxides having a diameter of 0.2 μm to 10 μm is 2×102 particle/mm2 to 1×104 particle/mm2; a fatigue limit ratio is higher than 0.42 after performing a heat treatment with an applied tensile strain of 10% at a heating temperature of 830° C. for a holding time of 5 minutes; voids are formed between the metallographic structure and the Fe—Mn—Nb-based composite oxides, and an equivalent circle diameter of the voids is 0.1 μm to 0.6 μm; and when each of the voids is approximated as a triangle and a long side of the triangle is set as a base, a value obtained by dividing a length of the base by a height of the triangle is 1.0 to 15.

摘要翻译： 用于玻璃搪瓷的冷轧钢板具有预定的化学组成，其中直径为0.2μm至10μm的Fe-Mn-Nb基复合氧化物的数量密度为2×102个/ mm 2至1×10 4 颗粒/ mm2; 在830℃的加热温度下进行10％的拉伸应变的热处理后的疲劳极限比高于0.42，保持时间为5分钟; 在金相组织与Fe-Mn-Nb系复合氧化物之间形成空隙，空隙的当量圆直径为0.1μm〜0.6μm， 并且当每个空隙近似为三角形并且将三角形的长边设置为基底时，通过将基底的长度除以三角形的高度而获得的值为1.0至15。

公开(公告)号：US20170145531A1

公开(公告)日：2017-05-25

申请号：US15422520

申请日：2017-02-02

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Kunio HAYASHI ,  Toshimitsu ASO ,  Toshimasa TOMOKIYO ,  Hitoshi TANINO ,  Ryozo WADA

IPC分类号： C21D9/00 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/42 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/00 ,  B21D22/02 ,  C22C38/58

CPC分类号： C21D9/0068 ,  B21D22/022 ,  C21D8/005 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/02 ,  C25D5/36

摘要： Provided is a method for manufacturing a hot stamped body, the method including: a hot-rolling step; a coiling step; a cold-rolling step; a continuous annealing step; and a hot stamping step, in which the continuous annealing step includes a heating step of heating the cold-rolled steel sheet to a temperature range of equal to or higher than Ac1° C. and lower than Ac3° C.; a cooling step of cooling the heated cold-rolled steel sheet from the highest heating temperature to 660° C. at a cooling rate of equal to or less than 10° C./s; and a holding step of holding the cooled cold-rolled steel sheet in a temperature range of 550° C. to 660° C. for one minute to 10 minutes.

公开(公告)号：US20160024610A1

公开(公告)日：2016-01-28

申请号：US14774447

申请日：2014-03-13

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Hiroyuki TANAHASHI ,  Toshimasa TOMOKIYO

IPC分类号： C21D9/46 ,  C22C38/54 ,  C22C38/50 ,  C22C38/42 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B32B15/20 ,  B32B15/01 ,  C21D6/00

CPC分类号： C21D9/46 ,  B22D1/00 ,  B32B15/012 ,  B32B15/20 ,  C21D1/18 ,  C21D6/002 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D6/02 ,  C21D7/13 ,  C21D2211/001 ,  C21D2211/004 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/12 ,  C23C2/40 ,  Y10T428/12757 ,  Y10T428/12799 ,  Y10T428/12958 ,  Y10T428/12972 ,  Y10T428/12979

摘要： A high strength steel sheet containing chemical components of, in mass %, C: 0.20 to 0.42%, Si: 0.06 to 0.5%, Mn: 0.2 to 2.2%, Cr: 0.1 to 2.5%, B: 0.0005 to 0.01%, O: 0.0020 to 0.020%, Al: 0.001 to 0.03%, Ti: 0.001 to 0.05%, N: 0.1% or less, P: 0.03% or less, S: 0.02% or less, and the balance: Fe and inevitable impurities. In steel, 5×103 pieces per mm2 or more to 1×105 pieces per mm2 or less of Mn oxides having a maximum length of 1 μm or more to 5 μm or less are present, and 1.7×102 pieces per mm2 or more to 5×103 pieces per mm2 or less of Mn—Si composite oxides having a short-axial length of 1 μm or more and a longitudinal length of 10 μm or less are present.

摘要翻译： 将以质量％计含有C：0.20〜0.42％，Si：0.06〜0.5％，Mn：0.2〜2.2％，Cr：0.1〜2.5％，B：0.0005〜0.01％的化学成分的高强度钢板，O ：0.0020〜0.020％，Al：0.001〜0.03％，Ti：0.001〜0.05％，N：0.1％以下，P：0.03％以下，S：0.02％以下，余量：Fe和不可避免的杂质。 在钢中，存在5×103个/ mm 2以上至1×105个/ mm 2以下的最大长度为1μm以上且5μm以下的Mn氧化物，1.7×102个/ mm 2以上〜 存在5×103个/ mm 2以下的短轴长度为1μm以上且长度为10μm以下的Mn-Si复合氧化物。

公开(公告)号：US20180363109A1

公开(公告)日：2018-12-20

申请号：US16110069

申请日：2018-08-23

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Hiroyuki TANAHASHI ,  Toshimasa TOMOKIYO

IPC分类号： C22C38/38 ,  C23C2/06 ,  C23C2/02 ,  C22C38/16 ,  C22C38/22 ,  C22C38/24 ,  B21B1/26 ,  C22C38/08 ,  C22C38/32 ,  C22C38/28 ,  C22C38/18 ,  C22C38/14 ,  C22C38/12 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/54 ,  C22C38/06 ,  C21D9/46 ,  C23C2/40 ,  C23C2/28 ,  C23C2/12

摘要： A hot stamping steel material, which secures good hydrogen embrittlement resistance even when the steel sheet after hot stamping is subjected to processing leading to remaining of stress, such as piercing and which is easily practicable, wherein the steel sheet has the chemical composition of: C: 0.18 to 0.26%; Si: more than 0.02% and not more than 0.05%; Mn: 1.0 to 1.5%; P: 0.03% or less; S: 0.02% or less; Al: 0.001 to 0.5%; N: 0.1% or less;O: 0.001 to 0.02%; Cr: 0 to 2.0%; Mo: 0 to 1.0%; V: 0 to 0.5%; W: 0 to 0.5%; Ni: 0 to 5.0%; B: 0 to 0.01%; Ti: 0 to 0.5%; Nb: 0 to 0.5%; Cu: 0 to 1.0%; and balance: Fe and impurities, in terms of % by mass, the concentration of a Mn-containing inclusion is not less than 0.010% by mass and less than 0.25% by mass, and the number ratio of a Mn oxide to the inclusion having a maximum length of 1.0 to 4.0 pm is 10.0% or more.

公开(公告)号：US20180230582A1

公开(公告)日：2018-08-16

申请号：US15576177

申请日：2016-05-25

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Kengo TAKEDA ,  Kazuo HIKIDA ,  Ken TAKATA ,  Motonori HASHIMOTO ,  Toshimasa TOMOKIYO ,  Yasushi TSUKANO ,  Takashi ARAMAKI

IPC分类号： C22C38/60 ,  C21D8/04 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC分类号： C22C38/60 ,  C21D8/02 ,  C21D8/0463 ,  C21D9/46 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

摘要： Low carbon steel plate excellent impact resistance characteristics after carburizing and quenching and after tempering, characterized by having a predetermined chemical composition, an average grain size of carbides of 0.4 μm to 2.0 μm, an area ratio of pearlite of 6% or less, a ratio of a number of carbides at the ferrite grain boundaries to the number of carbides inside the ferrite grains of over 1, and a Vickers hardness of 100HV to 180HV.

公开(公告)号：US20170051372A1

公开(公告)日：2017-02-23

申请号：US15338095

申请日：2016-10-28

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Toshimasa TOMOKIYO ,  Kunio HAYASHI ,  Toshimitsu ASO

IPC分类号： C21D9/00 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/42 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/00 ,  C22C38/58

CPC分类号： C21D9/0068 ,  C21D8/005 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

摘要： The present invention provides a method for manufacturing a hot stamped body having a vertical wall, the method including: a hot-rolling step; a coiling step; a cold-rolling step; a continuous annealing step; and a hot stamping step, in which the continuous annealing step includes a heating step of heating the cold-rolled steel sheet to a temperature range of equal to or higher than Ac1° C. and lower than Ac3° C.; a cooling step of cooling the heated cold-rolled steel sheet from the highest heating temperature to 660° C. at a cooling rate of equal to or less than 10° C./s; and a holding step of holding the cooled cold-rolled steel sheet in a temperature range of 550° C. to 660° C. for one minute to 10 minutes.

摘要翻译： 本发明提供一种制造具有垂直壁的热冲压体的方法，该方法包括：热轧步骤; 卷取步骤 冷轧步骤; 连续退火步骤; 和热冲压步骤，其中连续退火步骤包括将冷轧钢板加热至等于或高于Ac1℃并低于Ac3℃的加热步骤; 将加热的冷轧钢板从最高加热温度冷却到660℃的冷却速度为10℃以下的冷却工序; 以及将冷却后的冷轧钢板在550℃〜660℃的温度范围内保持1分钟〜10分钟的保持工序。

公开(公告)号：US20160289787A1

公开(公告)日：2016-10-06

申请号：US15038120

申请日：2014-11-21

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Kengo TAKEDA ,  Toshimasa TOMOKIYO ,  Yasushi TSUKANO ,  Takashi ARAMAKI

IPC分类号： C21D9/46 ,  C22C38/28 ,  C22C38/00 ,  C22C38/04 ,  C22C38/02 ,  C21D8/02 ,  C22C38/06

CPC分类号： C21D9/46 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D2211/003 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/28

摘要： A high-carbon steel sheet has a chemical composition represented by, in mass %, C: 0.60% to 0.90%, Mn: 0.30% to 1.50%, and Cr: 0.20% to 1.00%, and others, and has a structure represented by a concentration of Mn contained in cementite: 2% or more and 8% or less, a concentration of Cr contained in cementite: 2% or more and 8% or less, an average grain diameter of ferrite: 10 μm or more and 50 μm or less, an average particle diameter of cementite: 0.3 μm or more and 1.5 μm or less, and a spheroidized ratio of cementite: 85% or more.

摘要翻译： 高碳钢板的化学成分以C：0.60〜0.90％，Mn：0.30〜1.50％，Cr：0.20〜1.00％的质量％表示，并具有以下结构： 通过渗碳体含有的Mn浓度为2％以上8％以下，渗碳体中所含的Cr浓度为2％以上8％以下，铁素体的平均粒径为10μm以上且50以下 以下，渗碳体的平均粒径为0.3μm以上且1.5μm以下，并且，渗碳体的球化率为85％以上。