公开(公告)号：EP3216889A4

公开(公告)日：2017-10-25

申请号：EP16836913

申请日：2016-07-19

Applicant: TOKUSHU KINZOKU EXCEL CO LTD ,  JFE STEEL CORP

Inventor： TSUCHIYA EIJI ,  MATSUMURA YUTA ,  HOSOYA YOSHIHIRO ,  MIYAMOTO YUKA ,  KOBAYASHI TAKASHI ,  NAGATAKI YASUNOBU ,  SETO KAZUHIRO

IPC: C22C38/00 ,  C21D1/18 ,  C21D1/32 ,  C21D6/00 ,  C21D8/02 ,  C21D8/12 ,  C21D9/26 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26

CPC classification number: C21D1/32 ,  C21D1/18 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0268 ,  C21D9/46 ,  C21D2211/004 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26

Abstract: Provided is a high-carbon cold-rolled steel sheet having a thickness of less than 1.0 mm and capable of having good impact and hardness characteristics after a short solution treatment, and thereafter quenching and low-temperature tempering. A high-carbon cold-rolled steel sheet having a steel sheet chemical composition containing, in terms of mass%, C: 0.85-1.10%, Mn: 0.50-1.0%, Si: 0.10-0.35%, P: 0.030% or less, S: 0.030% or less, and Cr: 0.35-0.45%, and furthermore containing Nb: 0.005-0.020 mass% with the remainder being Fe and unavoidable impurities, having a steel sheet structure in which the average particle diameter (d av ) of carbide dispersed in the steel sheet is 0.2-0.7 (µm) and the spheroidization ratio is 90% or higher, and having a thickness of less than 1.0 mm. Mechanical characteristics having an excellent impact characteristic in which the impact value is 5 j/cm 2 or higher and a sufficient hardness characteristic within the range of 600-750 HV can thereby be manifested by a short solution treatment of 3-15 minutes, and thereafter quenching and low-temperature tempering.

公开(公告)号：DE69935125T3

公开(公告)日：2015-05-21

申请号：DE69935125

申请日：1999-12-03

Applicant: JFE STEEL CORP

Inventor： HOSOYA YOSHIHIRO ,  MORITA MASAYA ,  FUJITA TAKESHI ,  KITANO FUSATO ,  INAZUMI TORU ,  YAMASAKI YUJI ,  NAGATAKI YASUNOBU ,  HASEGAWA KOHEI ,  MATSUDA HIROSHI ,  ONO MORIAKI

IPC: C22C38/12 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14

公开(公告)号：AU1670697A

公开(公告)日：1997-08-28

申请号：AU1670697

申请日：1997-02-07

Applicant: JFE STEEL CORP

Inventor： HOSOYA YOSHIHIRO ,  TANIKAWA KATSUMI ,  KOJIMA KATSUMI ,  AWAYA TAKASHI ,  FURUYA HIROHIDE

IPC: C22C38/00 ,  C22C38/06 ,  H01M2/02 ,  C22C38/54 ,  C25D5/26

Abstract: A steel sheet for two-piece battery cans which has moldability excellent enough to permit the thickness of the side body of a can to be reduced by drawing and ironing and, when formed into cans, preferably possesses a high can strength and excellent secondary work embrittlement resistance and corrosion resistance. The steel sheet contains S and O (O: total oxygen content) so as to satisfy the requirements of S: 0.005 to 0.015 wt.%, preferably 0.005 to 0.012 wt.%, O: 0 to o.0025 wt.%, ÄS/10+0Ü ≤ 0.0035 (wt.%), preferably, ÄS/10+0Ü ≤ 0.0030 (wt.%), and preferably further contains B in an amount of 0.0005 to 0.0015 wt.% so as to satisfy the requirement of 0.2 ≤ B/N ≤ 1.0, or alternatively, at most 0.10 wt.% in total of at least one member selected among Cr: 0.03 to 0.10 wt.% and Ni: 0.01 to 0.10 wt.%. When it is desirable to ensure particularly excellent corrosion resistance, at least Ni plating or Fe-Ni alloyed plating is formed on both sides of the steel sheet.

公开(公告)号：AU2005227556B2

公开(公告)日：2008-02-14

申请号：AU2005227556

申请日：2005-03-31

Applicant: JFE STEEL CORP

Inventor： KIZU TARO ,  YOSHIDA HIROMI ,  HOSOYA YOSHIHIRO ,  URABE TOSHIAKI ,  OKUDA KANEHARU

IPC: C21D9/46 ,  C21D8/02 ,  C22C38/00 ,  C22C38/48 ,  C22C38/58

公开(公告)号：DE69935125T2

公开(公告)日：2007-10-25

申请号：DE69935125

申请日：1999-12-03

Applicant: JFE STEEL CORP

Inventor： FUJITA TAKESHI ,  KITANO FUSATO ,  HOSOYA YOSHIHIRO ,  INAZUMI TORU ,  YAMASAKI YUJI ,  MORITA MASAYA ,  NAGATAKI YASUNOBU ,  HASEGAWA KOHEI ,  MATSUDA HIROSHI ,  ONO MORIAKI

IPC: C22C38/12 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14

Abstract: The present invention relates to a very low C-Nb cold rolled steel sheet giving 340 to 440 MPa of tensile strength. For example, the cold rolled steel sheet consists of 0.0040 to 0.01% C, not more than 0.05% Si, 0.1 to 1.0% Mn, 0.01 to 0.05% P, not more than 0.02% S, 0.01 to 0.1% sol.Al, not more than 0.004% N, 0.01 to 0.14% Nb, by weight, and balance of Fe and inevitable impurities, and has not less than 0.21 of n value calculated from two points (1% and 10%) of nominal strain determined by the uniaxial tensile test, and relates to a method for manufacturing the cold rolled steel sheet. The present invention provides a high strength cold rolled steel sheet for automobile exterior panels having excellent combined formability, resistance to embrittlement during secondary operation, formability at welded portions, anti-burring performance, good surface appearance, and uniformity of material in a coil.

公开(公告)号：CA2530834A1

公开(公告)日：2005-04-07

申请号：CA2530834

申请日：2004-09-17

Applicant: JFE STEEL CORP

Inventor： HOSOYA YOSHIHIRO ,  YOSHIDA HIROMI ,  URABE TOSHIAKI ,  OKUDA KANEHARU

IPC: B21B3/00 ,  C22C38/00 ,  C21D8/04 ,  C21D9/46 ,  C22C38/12 ,  C22C38/58

Abstract: A high strength steel sheet excellent in deep drawing characteristics, characterized in that it has a chemical composition, in mass %, that C: 0010 to 0.050, Si: 1.0 % or less, Mn: 1.0 to 3.0 %, P: 0.005 to 0.1 %, S: 0.01 % or less, Al: 0.005 to 0.5 %, N: 0.01 % or less, Nb: 0.01 to 0.3 %, with the proviso that the contents of Nb and C in the steel satisfy the relationship: (Nb/93)/(C/12) = 0.2 to 0.7, the balance: Fe and inevitable impurities, has a steel structure containing a ferrite phase in an area % of 50 % or more and a martensite phase in an area % of 1 % or more, and has an average r value of 1.2 or more; and a method for production of the above steel. The steel sheet has a tensile strength (TH) of 440 Mpa or more, has a high r value and is excellent in deep drawing characteristics, and thus can be suitably used for an automobile.

公开(公告)号：CA2530834C

公开(公告)日：2011-11-01

申请号：CA2530834

申请日：2004-09-17

Applicant: JFE STEEL CORP

Inventor： YOSHIDA HIROMI ,  OKUDA KANEHARU ,  URABE TOSHIAKI ,  HOSOYA YOSHIHIRO

IPC: B21B3/00 ,  C22C38/00 ,  C21D8/04 ,  C21D9/46 ,  C22C38/12 ,  C22C38/58

Abstract: The present invention provides a high-strength steel sheet useful for applications to automobile steel sheets and the like and having excellent deep drawability, a tensile strength (TS) of as high as 440 MPa or more, and a high r value (average r value >= 1.2), and a process for producing the steel sheet. The steel sheet has a composition containing, by % by mass, 0.010 to 0.050% of C, 1.0% or less of Si, 1.0 to 3.0% of Mn, 0.005 to 0.1% of P, 0.01% or less of S, 0.005 to 0.5% of Al, 0.01% or less of N, and 0.01 to 0.3% of Nb, the Nb and C contents in steel satisfying the relation, (Nb/93)/(C/12) = 0.2 to 0.7, and the balance substantially including Fe and inevitable impurities. The steel microstructure contains a ferrite phase and a martensite phase at area ratios of 50% or more and 1% or more, respectively, and the average r value is 1.2 or more.

公开(公告)号：EP1666622A4

公开(公告)日：2006-11-29

申请号：EP04773419

申请日：2004-09-17

Applicant: JFE STEEL CORP

Inventor： YOSHIDA HIROMI ,  OKUDA KANEHARU ,  URABE TOSHIAKI ,  HOSOYA YOSHIHIRO

IPC: B21B3/00 ,  C22C38/00 ,  C21D8/04 ,  C21D9/46 ,  C22C38/12 ,  C22C38/58

CPC classification number: C22C38/02 ,  C21D8/04 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12

Abstract: A high strength steel sheet excellent in deep drawing characteristics, characterized in that it has a chemical composition, in mass %, that C: 0010 to 0.050, Si: 1.0 % or less, Mn: 1.0 to 3.0 %, P: 0.005 to 0.1 %, S: 0.01 % or less, Al: 0.005 to 0.5 %, N: 0.01 % or less, Nb: 0.01 to 0.3 %, with the proviso that the contents of Nb and C in the steel satisfy the relationship: (Nb/93)/(C/12) = 0.2 to 0.7, the balance: Fe and inevitable impurities, has a steel structure containing a ferrite phase in an area % of 50 % or more and a martensite phase in an area % of 1 % or more, and has an average r value of 1.2 or more; and a method for production of the above steel. The steel sheet has a tensile strength (TH) of 440 Mpa or more, has a high r value and is excellent in deep drawing characteristics, and thus can be suitably used for an automobile.

公开(公告)号：EP1731626A4

公开(公告)日：2007-10-31

申请号：EP05727349

申请日：2005-03-31

Applicant: JFE STEEL CORP

Inventor： KIZU TARO ,  OKUDA KANEHARU ,  URABE TOSHIAKI ,  YOSHIDA HIROMI ,  HOSOYA YOSHIHIRO

IPC: C22C38/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/48 ,  C22C38/58

CPC classification number: C21D8/0205 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/02 ,  C22C38/04

Abstract: Disclosed is a high-rigidity high-strength thin steel sheet having a tensile strength of not less than 590 MPa and a Young's modulus of not less than 225 GPa at the same time. The high-rigidity high-strength thin steel sheet has a composition consisting of, in mass%, C:0.02-0.15%, Si: 1.5% or less, Mn: 1.5-4.0%, P: 0.05% or less, S: 0.01% or less, Al: 1.5% or less, N: 0.01% or less, Nb: 0.02-0.40%, and the balance of iron and unavoidable impurities, wherein the C, N and Nb contents satisfy the following relations: 0.01

公开(公告)号：CA2566736C

公开(公告)日：2012-01-10

申请号：CA2566736

申请日：2006-10-31

Applicant: JFE STEEL CORP ,  THYSSENKRUPP STEEL AG

Inventor： YOKOTA TAKESHI ,  KOBAYASHI AKIO ,  SETO KAZUHIRO ,  HOSOYA YOSHIHIRO ,  HELLER THOMAS ,  HAMMER BRIGITTE ,  BODE ROLF ,  STICH GUENTER

IPC: C22C38/14 ,  B21B3/00 ,  B21C1/00 ,  B21C37/02 ,  C22C38/04 ,  C22C38/12

Abstract: The present invention is intended to provide a high strength steel sheet having a strength not lower than 780 MPa and exhibiting a high yield ratio, an excellent balance between the strength and the uniform elongation, and a good plating property in addition to a good balance between the strength and the stretch flangeability. The present invention provides a high strength steel, comprising 0.05 to 0.25 % of C, less than 0.5 % of Si, 0.5 to 3.0 % of Mn, not more than 0.06 % of P, not more than 0.01 % of S, 0.50 to 3.0 % of Sol. Al, not more than 0.02 % of N, 0.1 to 0.8 % of Mo, 0.02 to 0.40 % of Ti, and the balance of iron and unavoidable impurities, wherein the steel has a structure formed of at least three phases including a bainite phase, and a retained austenite phase in addition to a ferrite phase having a composite carbide containing Ti and Mo dispersed and precipitated therein, wherein the total volume of the ferrite phase and the bainite phase is not smaller than 80%, the volume of the bainite phase is 5% to 60%, and the volume of the retained austenite phase is 3 to 20%.