公开(公告)号：US10329635B2

公开(公告)日：2019-06-25

申请号：US14765622

申请日：2014-02-13

Applicant: KOBE STEEL, LTD.

Inventor： Kosuke Shibata ,  Toshio Murakami ,  Elijah Kakiuchi ,  Katsura Kajihara

IPC: C21D9/46 ,  C22C38/06 ,  C22C38/16 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C21D1/84 ,  C21D1/18

Abstract: A high strength cold-rolled steel sheet has a component composition containing specific amounts of C, Si, Mn, P, S, N and Al, respectively with a remainder being iron and inevitable impurities. The steel sheet contains 95% or more of martensite in terms of area ratio, and contains 5% or less (inclusive of 0%) of residual austenite and ferrite in terms of a total area ratio. An average size of a carbide is 60 nm or less in terms of an equivalent circle diameter, and a number density of the carbide having the equivalent circle diameter of 25 nm or more is 5.0×105 pieces or less per mm2. The steel sheet has a yield strength of 1,180 MPa or more and a tensile strength of 1,470 MPa or more.

公开(公告)号：US20150184274A1

公开(公告)日：2015-07-02

申请号：US14413471

申请日：2013-06-26

Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

Inventor： Elijah Kakiuchi ,  Toshio Murakami ,  Katsura Kajihara ,  Tatsuya Asai ,  Naoki Mizuta

IPC: C23C2/06 ,  B32B15/01 ,  C23C2/02 ,  C21D8/02 ,  C21D9/46

CPC classification number: C23C2/06 ,  B32B15/013 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C23C2/02 ,  C23C2/28 ,  Y10T428/12799

Abstract: A hot-dip galvanized steel sheet contains specific amounts of C, Si, Mn, P, S, Ti, Al, and N with the remainder being iron and unavoidable impurities. Bainitic ferrite, martensite, retained γ, and ferrite (α) are present each in a specific area ratio. The remainder γ has a specific C concentration. Sub-grains in the recrystallized α and un-recrystallized α have a specific grain diameter. The surface area ratio of α and worked α having a grain diameter of 5 μm or more is 5% or less. The average particle diameter of TiC particles inside a grains is 10 nm or less.

Abstract translation: 热浸镀锌钢板含有特定量的C，Si，Mn，P，S，Ti，Al和N，其余为铁和不可避免的杂质。 贝氏体铁素体，马氏体，保留γ和铁素体（α）各自以比面积比存在。 其余γ具有特定的C浓度。 再结晶α和未再结晶α中的亚晶粒具有特定的粒径。 具有5μm以上的粒径的α和加工α的表面积比为5％以下。 晶粒内的TiC粒子的平均粒径为10nm以下。

公开(公告)号：US09890437B2

公开(公告)日：2018-02-13

申请号：US14377354

申请日：2013-02-06

Applicant: Kobe Steel, Ltd.

Inventor： Elijah Kakiuchi ,  Toshio Murakami ,  Katsura Kajihara ,  Tatsuya Asai ,  Naoki Mizuta ,  Hideo Hata

IPC: C22C38/06 ,  C21D8/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/58 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/18

CPC classification number: C21D8/005 ,  C21D8/02 ,  C21D8/0236 ,  C21D8/0247 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/18 ,  C22C38/58

Abstract: This high-strength steel sheet contains, in mass %, 0.05 to 0.3% of C, 1 to 3% of Si, 0.5 to 3% of Mn, up to 0.1% (inclusive of 0%) of P, up to 0.01% (inclusive of 0%) of S, 0.001 to 0.1% of Al and 0.002 to 0.03% of N with the balance consisting of iron and unavoidable impurities, and has a microstructure which comprises, in area fraction relative to the microstructure, 40 to 85% of bainitic ferrite, 5 to 20% of retained austenite (γR), 10 to 50% (in total) of martensite and γR, and 5 to 40% of ferrite. The retained austenite (γR) has a C concentration of 0.5 to 1.0 mass %, while the quantity of γR present in the ferrite grains is 1% or more (in area fraction) relative to the microstructure.

公开(公告)号：US09863028B2

公开(公告)日：2018-01-09

申请号：US14413471

申请日：2013-06-26

Applicant: Kobe Steel, Ltd.

Inventor： Elijah Kakiuchi ,  Toshio Murakami ,  Katsura Kajihara ,  Tatsuya Asai ,  Naoki Mizuta

IPC: C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  B32B15/01 ,  B32B15/18 ,  C23C2/06 ,  C23C2/28 ,  C21D9/46 ,  C22C38/00 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/18 ,  C21D8/02 ,  C23C2/02

CPC classification number: C23C2/06 ,  B32B15/013 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C23C2/02 ,  C23C2/28 ,  Y10T428/12799

Abstract: A hot-dip galvanized steel sheet contains specific amounts of C, Si, Mn, P, S, Ti, Al, and N with the remainder being iron and unavoidable impurities. Bainitic ferrite, martensite, retained γ, and ferrite (α) are present each in a specific area ratio. The remainder γ has a specific C concentration. Sub-grains in the recrystallized α and un-recrystallized α have a specific grain diameter. The surface area ratio of α and worked α having a grain diameter of 5 μm or more is 5% or less. The average particle diameter of TiC particles inside α grains is 10 nm or less.

公开(公告)号：US20150000796A1

公开(公告)日：2015-01-01

申请号：US14377354

申请日：2013-02-06

Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (Kobe Steel, Ltd.)

Inventor： Elijah Kakiuchi ,  Toshio Murakami ,  Katsura Kajihara ,  Tatsuya Asai ,  Naoki Mizuta ,  Hideo Hata

IPC: C21D8/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/00 ,  C22C38/06

CPC classification number: C21D8/005 ,  C21D8/02 ,  C21D8/0236 ,  C21D8/0247 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/18 ,  C22C38/58

Abstract: This high-strength steel sheet contains, in mass %, 0.05 to 0.3% of C, 1 to 3% of Si, 0.5 to 3% of Mn, up to 0.1% (inclusive of 0%) of P, up to 0.01% (inclusive of 0%) of S, 0.001 to 0.1% of Al and 0.002 to 0.03% of N with the balance consisting of iron and unavoidable impurities, and has a microstructure which comprises, in area fraction relative to the microstructure, 40 to 85% of bainitic ferrite, 5 to 20% of retained austenite (γR), 10 to 50% (in total) of martensite and γR, and 5 to 40% of ferrite. The retained austenite (γR) has a C concentration of 0.5 to 1.0 mass %, while the quantity of γR present in the ferrite grains is 1% or more (in area fraction) relative to the microstructure.

Abstract translation: 该高强度钢板以质量％计含有C：0.05〜0.3％，Si：1-3％，Mn：0.5〜3％，P：0.1％以下（含0％）以上，0.01％ （包括0％）的S，0.001〜0.1％的Al和0.002〜0.03％的N，余量由铁和不可避免的杂质组成，并且具有相对于微观结构的面积分数为40〜85的微结构 贝氏体铁素体，5〜20％的残留奥氏体（γR），10〜50％的马氏体和γR，5〜40％的铁素体。 残留奥氏体（γR）的C浓度为0.5〜1.0质量％，铁素体粒子中存在的γR相对于微观结构为1％以上（面积分数）。