公开(公告)号：EP2078764A4

公开(公告)日：2011-07-06

申请号：EP07829822

申请日：2007-10-15

申请人： SUMITOMO METAL IND

发明人： ARAI YUJI ,  TAKANO TAKASHI

IPC分类号： C22C38/00 ,  B60R21/26 ,  C21D8/10 ,  C21D9/08 ,  C22C38/38 ,  C22C38/58

CPC分类号： C21D8/10 ,  C21D9/08 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22

公开(公告)号：EP1816227A4

公开(公告)日：2008-08-27

申请号：EP05795706

申请日：2005-10-24

申请人： SUMITOMO METAL IND

发明人： TAKANO TAKASHI ,  ARAI YUJI ,  KONDO KUNIO ,  HITOSHIO KEISUKE

IPC分类号： C22C38/00 ,  B60R21/26 ,  C21D8/10 ,  C21D9/08 ,  C22C38/54

CPC分类号： C22C38/02 ,  B60R2021/26082 ,  C21D1/18 ,  C21D1/30 ,  C21D8/10 ,  C21D9/14 ,  C22C38/04 ,  C22C38/18 ,  C22C38/28

摘要： A steel pipe for an air bag inflator which has a high strength of a tensile strength of 900 MPa or more, preferably 1000 MPa or more, together with high toughness, and exhibits good burst resistance wherein no cracks develop in a burst test at -40˚C or lower is produced by a method comprising providing a raw steel pipe containing, in mass %, 0.05 to 0.20 % of C, 0.1 to 1.0 % of Si, 0.025 % or lower of P, 0.010 % or lower of S, 0.05 to 1.45 % of Cr, 0.10 % or less of Al, 0.02 % or less of Ti, and one or both of Ti and Mn satisfying 0.4 ≤ Mn + 40 X Ti ≤ 1.2, rapidly cooling the raw steel pipe from a temperature of Ac1 transformation temperature or higher, tempering the resultant steel pipe at a temperature lower than Ac1 transformation temperature, subjecting the tempered steel pipe to a cold working wherein a reduction of area is 65 % or less, and then subjecting the worked steel pipe to a stress relief annealing at a temperature lower than Ac1 transformation temperature. The L/T ratio of X ray integral intensity ratios of {110} face measured in the cross section perpendicular to the axis direction (L) and the cross section perpendicular to the periphery direction (T) of the above steel pipe is 50 or lass.

公开(公告)号：EP1375683A4

公开(公告)日：2006-01-11

申请号：EP02713254

申请日：2002-03-29

申请人： SUMITOMO METAL IND

发明人： KONDO KUNIO ,  YAMAMOTO MIYUKI ,  TAKANO TAKASHI ,  BEPPU KENICHI ,  HIRANO SUSUMU ,  HITOSHIO KEISUKE ,  KURATA HIDETOSHI

IPC分类号： B60R21/268 ,  C21D1/18 ,  C21D8/10 ,  C21D9/08 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/40 ,  C22C38/42 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58 ,  B60R21/16 ,  C22C38/00

CPC分类号： C22C38/40 ,  B60R21/268 ,  C21D1/18 ,  C21D8/10 ,  C21D9/08 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/42 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

摘要： A method for producing a high strength steel tube, which comprises manufacturing a tube by the use of a steel having a chemical composition in mass %: C: 0.05 to 0.20 %; Si: 0.1 to 1.0; Mn: 0.20 to 2.0 %; P: 0.025 % or less; S: 0.010 % or less, Cr: 0.05 to 1.0 %, Al: 0.10 % or less; optionally, at least one of Mo: 0.050 % or less, Ni: 1.5 % or less, Cu: 0.5 % or less, V: 0.2 % or less, Ti: 0.1 % or less, Nb: 0.1 % or less, and B: 0.005 % or less; and also optionally, at least one of Ca: 0.01 % or less, Mg: 0.01 % or less, REM (rare earth element): 0.01 % or less; balance Fe and impurities; and then subjecting the tube to a cold working to form it so as to have predetermined dimensions, and thereafter, heating it to a temperature of the AC1 transformation temperature thereof or higher, followed by quenching, and then, tempering it at a temperature of the AC1 transformation temperature or lower. The steel tube is capable of corresponding to the increase in the pressure of a gas blowing out into an air bag and the reduction in the wall-thickness of an accumulator.