公开(公告)号：EP2090671A4

公开(公告)日：2013-03-27

申请号：EP07742324

申请日：2007-04-18

申请人： NIPPON STEEL CORP

发明人： YAMASAKI SHINGO ,  NISHIDA SEIKI ,  KIKUCHI MAKIO

IPC分类号： C22C38/00 ,  B60C9/00 ,  C21D6/00 ,  C21D8/02 ,  C21D8/06 ,  C21D9/52 ,  C21D9/573 ,  C21D9/64 ,  C22C38/14 ,  C22C38/54 ,  D07B1/06

CPC分类号： C22C38/00 ,  B60C9/0007 ,  C21D6/008 ,  C21D8/0247 ,  C21D8/0263 ,  C21D8/065 ,  C21D9/525 ,  C21D9/5732 ,  C21D9/64 ,  C21D2211/009 ,  D07B1/066 ,  D07B2205/3035 ,  D07B2205/3042 ,  D07B2205/3057 ,  D07B2207/4045 ,  D07B2801/10 ,  D07B2801/60

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 hot rolled, the hot-rolled steel is coiled in a specified temperature range, and the coiled steel is subjected to patenting at a predetermined cooling rate, thereby affording a high-carbon steel wire excellent in workability. It is high-strength steel wire excellent in drawability comprising 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 having a pearlite block size of not less than 20 µm and not greater than 45 µm. The invention also provides a high-carbon steel wire excellent in ductility, which is manufactured by subjecting the wire rod to intermediate patenting and cold drawing and has a tensile strength of 2800 MPa or greater.