公开(公告)号：EP2905353A4

公开(公告)日：2016-03-30

申请号：EP13843683

申请日：2013-10-03

申请人： NIPPON STEEL & SUMITOMO METAL CORP ,  NAMITEI CO LTD ,  OCC CORP

发明人： KOSAKA MAKOTO ,  OHASHI SHOUICHI ,  NISHIDA SEIKI ,  MURAO MASATSUGU ,  MURAO KOUICHI ,  OYAMADA KEN ,  IKEBATA SYUNYA

IPC分类号： C22C38/00 ,  B21B1/16 ,  B21C1/00 ,  C21D8/06 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  C22C38/32 ,  G02B6/44

CPC分类号： G02B6/443 ,  B21B1/16 ,  B21C1/003 ,  C21D8/06 ,  C21D8/065 ,  C21D2211/005 ,  C21D2211/009 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  C22C38/32 ,  G02B6/4427

摘要： There is provided a deformed steel wire includes, as a chemical component, by mass%; C: 0.30% to 1.10%, Si: 0.10% to 1.50%, and Mn: 0.20% to 1.50%, and the balance consists of Fe and unavoidable impurities, in which a metallographic structure is a ferrite-pearlite structure or a pearlite structure, integration degrees of a crystal orientation in a longitudinal direction of a thickness center area and a surface area are in a range of 2.0 to 4.0, an absolute value of a difference in the integration degree between an inner surface and an outer surface of the surface area is 0.3 or less, an integration degree of a crystal orientation in a thickness direction of the thickness center area is in a range of 1.2 to 3.8, and a dimensional accuracy index is in a range of 0.5 to 2.0.

公开(公告)号：EP2175043A4

公开(公告)日：2015-08-12

申请号：EP09725961

申请日：2009-03-09

申请人： NIPPON STEEL & SUMITOMO METAL CORP

发明人： YAMASAKI SHINGO ,  NISHIDA SEIKI

IPC分类号： C22C38/00 ,  C21D8/06 ,  C22C38/54

CPC分类号： C21D9/525 ,  B21C1/003 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/065 ,  C21D2211/009 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/54 ,  D07B1/066 ,  D07B2205/3035 ,  D07B2205/3057 ,  D07B2801/10

公开(公告)号：EP2083094A4

公开(公告)日：2015-04-22

申请号：EP07742332

申请日：2007-04-18

申请人： NIPPON STEEL & SUMITOMO METAL CORP

发明人： YAMASAKI SHINGO ,  NISHIDA SEIKI ,  KIKUCHI MAKIO

IPC分类号： C22C38/00 ,  C21D6/00 ,  C21D8/06 ,  C21D9/52 ,  C22C38/14 ,  C22C38/54

CPC分类号： C22C38/00 ,  C21D6/005 ,  C21D6/008 ,  C21D8/06 ,  C21D8/065 ,  C21D9/52 ,  C21D2211/002 ,  C21D2211/009

摘要： The invention provides wire rod excellent in drawability and steel wire made from the wire rod as starting material with high productivity at good yield and low cost. A hard steel wire rod of a specified composition is heated in a specified temperature range to conduct post-reaustenization patenting and thereby obtain a high-carbon steel wire excellent in ductility that has a pearlite structure of an area ratio of 97% or greater and the balance of non-pearlite structures including bainite, degenerate-pearlite and pro-eutectoid ferrite and whose fracture reduction of area RA satisfies Expressions (1), (2) and (3) below: RA ‰¥ RAmin where RAmin = a - b x pearlite block size (µm), a = - 0.0001187 × TS MPa 2 + 0.31814 × TS MPa - 151.32 b = 0.0007445 × TS MPa - 0.3753