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：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：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。