公开(公告)号：EP2460903A4

公开(公告)日：2013-08-07

申请号：EP10804582

申请日：2010-07-27

Applicant: JFE STEEL CORP

Inventor： ONO YOSHIHIKO ,  TAKAHASHI KENJI ,  OKUDA KANEHARU ,  TAIRA SHOICHIRO ,  SAKURAI MICHITAKA ,  FUSHIWAKI YUSUKE

IPC: C22C38/06 ,  C21D9/46 ,  C22C38/58

CPC classification number: C21D8/0236 ,  C21D8/02 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/04 ,  C22C38/06 ,  C22C38/58

公开(公告)号：EP2634281A4

公开(公告)日：2015-09-09

申请号：EP11840472

申请日：2011-11-10

Applicant: JFE STEEL CORP

Inventor： TAKAHASHI KENJI ,  OKUDA KANEHARU ,  ONO YOSHIHIKO

IPC: C22C38/00 ,  B32B15/01 ,  B32B15/18 ,  C21D8/02 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/38 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C30/00

CPC classification number: C22C38/00 ,  B32B15/013 ,  B32B15/18 ,  C21D8/0226 ,  C21D8/0236 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C30/005 ,  Y10T428/12799 ,  Y10T428/12972

公开(公告)号：EP2392683A4

公开(公告)日：2012-10-17

申请号：EP10735977

申请日：2010-02-02

Applicant: JFE STEEL CORP

Inventor： ONO YOSHIHIKO ,  TAKAHASHI KENJI ,  OKUDA KANEHARU ,  TAIRA SHOICHIRO

IPC: C22C38/00 ,  C21D6/00 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/18 ,  C22C38/22 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28

CPC classification number: C23C2/40 ,  C21D6/00 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/18 ,  C22C38/22 ,  C22C38/28 ,  C22C38/32 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  Y10T428/12799 ,  Y10T428/12972

公开(公告)号：EP2447390A4

公开(公告)日：2016-03-30

申请号：EP10792236

申请日：2010-06-25

Applicant: JFE STEEL CORP

Inventor： ONO YOSHIHIKO ,  TAKAHASHI KENJI ,  OKUDA KANEHARU ,  TAIRA SHOICHIRO ,  SAKURAI MICHITAKA ,  FUSHIWAKI YUSUKE

IPC: C23C2/06 ,  C21D9/46 ,  C22C38/00 ,  C22C38/38 ,  C22C38/58 ,  C23C2/02 ,  C23C2/28

CPC classification number: C23C2/02 ,  C21D9/46 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/32 ,  C22C38/38 ,  C23C2/06 ,  C23C2/28

Abstract: A high-strength galvanized steel sheet having a low YP, good stretch flangeability, and excellent corrosion resistance and a method for manufacturing the same are provided. The steel sheet contains, on a percent by mass basis, more than 0.015% to less than 0.10% of C, 0.5% or less of Si, 1.0% to 1.9% of Mn, 0.015% to 0.050% of P, 0.03% or less of S, 0.01% to 0.5% of sol. Al, 0.005% or less of N, less than 0.40% of Cr, 0.005% or less of B, less than 0.15% of Mo, 0.4% or less of V, and less than 0.020% of Ti, in which 2.2‰¤[Mneq]‰¤3.1 and [%Mn]+3.3[%Mo]‰¤1.9, and [%Mn]+3.3[%Mo])/(1.3[%Cr]+8[%P]+150B*)

公开(公告)号：EP2762596A4

公开(公告)日：2015-11-04

申请号：EP11873194

申请日：2011-09-28

Applicant: JFE STEEL CORP

Inventor： ONO YOSHIHIKO ,  TAKAHASHI KENJI ,  OKUDA KANEHARU ,  FUSHIWAKI YUSUKE ,  SAKURAI MICHITAKA

IPC: C22C38/38 ,  C21D8/02 ,  C21D9/46

CPC classification number: C21D8/0263 ,  B32B15/013 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C21D8/0284 ,  C21D11/00 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/008 ,  C22C18/00 ,  C22C18/04 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  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 ,  C22C38/60 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

Abstract: A low cost, a high strength steel sheet which exhibits excellent chipping resistance, low YP, high BH and high El and, further, exhibits a small change in material quality in a coil, and a method for manufacturing the steel sheet are provided. A high strength steel sheet is formed of steel having the composition containing by mass% over 0.015% and less than 0.100% C, less than 0.50% Si, over 1.0% and less than 2.0% Mn, 0.05% or less P, 0.03% or less S, 0.01% or more and 0.3% or less sol. Al, 0.005% or less N, less than 0.35% Cr, 0.0010% or more and 0.0050% or less B, less than 0.15% Mo, less than 0.030% Ti, and iron and unavoidable impurities as a balance, wherein the steel satisfies 2.1‰¤[Mneq]‰¤3.1, the microstructure of the steel includes a ferrite and a second phase, a volume fraction of the second phase is set to 2.0 to 12.0%, a total ratio of a volume fraction of martensite and a volume fraction of retained ³ to the volume fraction of second phase is 60% or more, and the number of carbides which are present within ferrite particles, have an aspect ratio of 3.0 or less and have a diameter of 0.25 to 0.90µm is set to 10000 pieces/mm 2 or less. Here, [Mneq]=[%Mn]+1.3[%Cr]+3.3[%Mo]+8[%P]+150B*, B * = % B + % Ti / 48 × 10.8 × 0.9 + % Al / 27 × 10.8 × 0.025 , and B * = 0.0022 when B * satisfies B * ‰¥ 0.0022.

公开(公告)号：EP1331278A4

公开(公告)日：2008-09-10

申请号：EP01965664

申请日：2001-09-14

Applicant: JFE STEEL CORP

Inventor： NAKAI YOSHIE ,  MURAI TAKESHI ,  MATSUNO HIDETOSHI ,  KIKUCHI YOSHITERU ,  TAKAHASHI KENJI ,  NIMURA YOICHI ,  SHIMIZU HIROSHI ,  ISAWA TOMOO ,  KAWASHIMA TAKESHI ,  OKAMURA TATSUYA

IPC: C21B3/04 ,  C21C1/02 ,  C21C7/04 ,  C21C7/06 ,  C21C7/064 ,  C21C7/072 ,  C21C7/076

CPC classification number: C21C7/076 ,  C21B3/04 ,  C21C1/025 ,  C21C7/04 ,  C21C7/06 ,  C21C7/0645 ,  C21C7/072 ,  Y02P10/216 ,  Y02P10/242 ,  Y02W30/542

Abstract: A refining agent which comprises Al, MgO and CaO as main components and contains dolomite as a source of MgO and CaO, and, when fed into a molten iron, forms Mg vapor by reactions in the molten iron. The Mg vapor causes refining reactions.