公开(公告)号：EP2204463A4

公开(公告)日：2017-12-27

申请号：EP08846041

申请日：2008-10-27

申请人： NIPPON STEEL & SUMITOMO METAL CORP

发明人： TERAMOTO SHINYA ,  MIYANISHI KEI ,  HASHIMURA MASAYUKI

IPC分类号： C22C38/00 ,  C21D8/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38

CPC分类号： C22C38/38 ,  C21D1/25 ,  C21D7/13 ,  C21D8/06 ,  C21D2211/004 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32

摘要： The present invention provides hot forging use non heat-treated steel where controlled cooling after shaping by hot forging is used to make the main structure of the steel martensite even without subsequent reheating and heat treatment by quenching and tempering and thereby give a steel part with a high strength and high toughness and superior machineability and a hot forged non heat-treated steel part made of that steel, in particular provides a martensite type hot forging use non heat-treated steel characterized by containing, by mass%, C: 0.10 to 0.20%, Si: 0.10 to 0.50%, Mn: 1.0 to 3.0%, P: 0.001 to 0.1%, S: 0.005 to 0.8%, Cr: 0.10 to 1.50%, Al: over 0.1 to 0.20%, and N: 0.0020 to 0.0080% and having a balance of substantially Fe and unavoidable impurities and a hot forged non heat-treated steel part made of such steel and characterized in that the steel structure of the entire cross-section at part or all of that part is substantially a martensite structure with an effective crystal grain size of 15 µm or less.

公开(公告)号：EP2746420A4

公开(公告)日：2015-06-03

申请号：EP12824592

申请日：2012-08-15

申请人： NIPPON STEEL & SUMITOMO METAL CORP

发明人： TERAMOTO SHINYA ,  KUBOTA MANABU

IPC分类号： C22C38/28 ,  C21D1/06 ,  C21D6/00 ,  C21D8/06 ,  C21D9/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/34 ,  C22C38/38 ,  F16F1/02

CPC分类号： F16F1/02 ,  C21D1/06 ,  C21D6/008 ,  C21D8/065 ,  C21D9/02 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/34 ,  C22C38/38

公开(公告)号：EP2615190A4

公开(公告)日：2015-04-22

申请号：EP11823298

申请日：2011-06-02

申请人： NIPPON STEEL & SUMITOMO METAL CORP

发明人： TAKADA HIROMASA ,  TERAMOTO SHINYA

IPC分类号： C22C38/00 ,  C22C38/42 ,  C22C38/48 ,  F16C29/00 ,  F16C33/12 ,  F16C33/32 ,  F16C33/34 ,  F16C33/62

CPC分类号： C22C38/02 ,  C22C38/001 ,  C22C38/008 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  F16C33/06 ,  F16C33/12 ,  F16C33/32 ,  F16C33/34 ,  F16C33/62 ,  F16C2204/60 ,  F16C2204/64 ,  F16C2204/70 ,  F16C2223/18 ,  F16C2300/42

公开(公告)号：EP2305851A4

公开(公告)日：2014-01-29

申请号：EP09803005

申请日：2009-07-23

申请人： NIPPON STEEL & SUMITOMO METAL CORP ,  ISUZU MOTORS LTD

发明人： TAKADA HIROMASA ,  TERAMOTO SHINYA ,  FUKUDA SHINSAKU

IPC分类号： C22C38/00 ,  C22C38/38 ,  C22C38/60

CPC分类号： C22C38/02 ,  C22C38/001 ,  C22C38/04 ,  C22C38/06 ,  C22C38/24

摘要： High strength fracture splitting use non-heat treated steel containing, by mass%, C: 0.23 to 0.35%, Si: 0.70 to 1.30%, Mn: 0.76 to 1.17%, P: 0.040 to 0.080%, S: 0.040 to 0.118%, Cr: 0.05 to 0.20%, Al: 0.010% or less, V: 0.27 to 0.45%, and N: 0.0050 to 0.0145%, having a balance of Fe and unavoidable impurities, having values of three formulas limiting the composition of ingredients satisfying required values, ensuring hot ductility, and, when hot forged, then cooled by air cooling or air blast cooling, forming a ferrite-pearlite structure having a ferrite fraction of 60% or more, and a fracture splitting use steel part.