公开(公告)号：EP1264910B1

公开(公告)日：2008-05-21

申请号：EP01908167.8

申请日：2001-02-28

申请人： Nippon Steel Corporation

发明人： FUJITA, Nobuhiro, c/o Nippon Steel Corporation ,  YOSHINAGA, Naoki, c/o Nippon Steel Corporation ,  TAKAHASHI, Manabu, c/o Nippon Steel Corporation ,  ASAHI, Hitoshi, c/o Nippon Steel Corporation ,  SHINOHARA, Yasuhiro, c/o Nippon Steel Corporation ,  HASEGAWA, Yasushi, Nippon Steel Corp. Nagoya Works

IPC分类号： C22C38/00 ,  C22C38/04 ,  C22C38/58 ,  C21D8/10

CPC分类号： C21D8/10 ,  C21D2201/05 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  Y10S148/909

摘要： A steel pipe having excellent formability, characterized in that it comprises, in mass %, 0.0005 to 0.30 % of C, 0.001 to 2.0 % of Si and 0.01 to 3.0 %of Mn, and optionally contains specific amounts of specific elements, the balance being Fe and inevitable impurities, and, with respect to the plate plane at 1/2 plate thickness position of a steel plate, an average X-ray random intensity ratio of the orientation groups of {110} to {111} is 2.0 or more and/or an X-ray random intensity ratio of {110} is 3.0 or more. The steel pipe has high strength and exhibits excellent formability in the hydroform process and other forming processes.

公开(公告)号：EP1264910A1

公开(公告)日：2002-12-11

申请号：EP01908167.8

申请日：2001-02-28

申请人： NIPPON STEEL CORPORATION

发明人： FUJITA, Nobuhiro, c/o Nippon Steel Corporation ,  YOSHINAGA, Naoki, c/o Nippon Steel Corporation ,  TAKAHASHI, Manabu, c/o Nippon Steel Corporation ,  ASAHI, Hitoshi, c/o Nippon Steel Corporation ,  SHINOHARA, Yasuhiro, c/o Nippon Steel Corporation ,  HASEGAWA, Yasushi, Nippon Steel Corp. Nagoya Works

IPC分类号： C22C38/00 ,  C22C38/04 ,  C22C38/58 ,  C21D8/10

CPC分类号： C21D8/10 ,  C21D2201/05 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  Y10S148/909

摘要： The present invention is a high strength steel pipe excellent in formability in hydroforming and similar forming methods, characterized by: containing, in mass, C of 0.0005 to 0.30%, Si of 0.001 to 2.0%, Mn of 0.01 to 3.0% and appropriate amounts of other elements if necessary, with the balance consisting of Fe and unavoidable impurities; and an average for the ratios of the X-ray strength in the orientation component group of {110} to {111} to random X-ray diffraction strength on a plane at the wall thickness center being 2.0 or more and/or a ratio of the X-ray strength in the orientation component of {110} to random X-ray diffraction strength on the plane at the wall thickness center being 3.0 or more.