公开(公告)号：EP1496132A4

公开(公告)日：2009-09-16

申请号：EP03746440

申请日：2003-04-09

申请人： JFE STEEL CORP ,  JTEKT CORP

发明人： MATSUZAKI A ,  IWAMOTO TAKASHI ,  GOTO MASAO ,  KIZAWA KATSUHIKO

IPC分类号： C21D1/06 ,  C22C38/00 ,  C21C1/06 ,  C21D1/18 ,  C21D9/40 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  C22C38/22 ,  C22C38/38

CPC分类号： C22C38/02 ,  C21D1/06 ,  C21D9/40 ,  C22C38/002 ,  C22C38/04 ,  C22C38/22 ,  C23C8/22 ,  Y10S148/906

摘要： A case hardening bearing steel having an excellent rolling contact fatigue life in intermediate temperature, in addition, excellent toughness at room temperature is provided. Specific means for solving the problems are as follows. The composition contains, by mass percent, C of 0.15 to 0.30 mass percent, Si of 0.5 to 2.0 mass percent, Mn of 0.3 to 2.0 mass percent, Cr of 1.3 to 2.5 mass percent, Mo of 0.3 to 1.0 mass percent, and O of not more than 0.0012 mass percent in a range where (Si + Mo) ≥ 1.0 mass percent is satisfied, and contains iron and inevitable impurities as remnant; the maximum size of oxide nonmetallic inclusion is not more than 12.5 mu m when examined area is 320 mm ; number of the oxide nonmetallic inclusion having a diameter of equivalent circle of 3 mu m or more is not more than 250 when the examined area is 320 mm ; in addition, C density of an outer layer is adjusted to be in a range from 0.7 to 1.2 mass percent by carburization.

公开(公告)号：EP1614761A4

公开(公告)日：2007-02-28

申请号：EP04727389

申请日：2004-04-14

申请人： JFE STEEL CORP ,  JTEKT CORP

发明人： IWAMOTO TAKASHI ,  MATSUZAKI AKIHIRO ,  OHNO KAZUHIKO ,  GOTO MASAO ,  HARADA HISASHI ,  NISHISAKA HISATO

IPC分类号： C22C38/00 ,  F16C33/32 ,  C21D1/18 ,  C21D1/32 ,  C21D6/00 ,  C21D8/06 ,  C22C38/38 ,  C22C38/58 ,  F16C33/30 ,  F16C33/34 ,  F16C33/62

CPC分类号： C22C38/22 ,  C21D1/18 ,  C21D6/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  F16C33/30 ,  F16C33/62 ,  Y10S148/906 ,  Y10S384/912

摘要： A steel material with excellent fatigue life and method of producing the material. The material contains, in mass percent, 0.7-1.1% of C, 0.2-2.0% of Si, 0.4-2.5% of Mn, 1.6-4.0% of Cr, not less than 0.1% and less than 0.5% of Mo, 0.010-0.050% of Al, with the balance being Fe and unavoidable impurities. The material is subjected to quenching and tempering. In the material, the diameter of a grain of residual cementite is 0.05-1.5 mum, and the diameter of a grain of former austenite is not more than 30 mum. Using the steel material as bearing steel can extend bearing life even under severe use conditions.

公开(公告)号：EP3276023A4

公开(公告)日：2018-01-31

申请号：EP16768070

申请日：2016-03-24

申请人： JFE STEEL CORP

发明人： KASAI MASAYUKI ,  IWAMOTO TAKASHI ,  TOMITA KUNIKAZU

IPC分类号： C22C38/00 ,  C21D1/06 ,  C21D8/06 ,  C22C38/60

CPC分类号： C22C38/60 ,  C21D1/06 ,  C21D1/20 ,  C21D1/74 ,  C21D7/13 ,  C21D8/0226 ,  C21D8/0263 ,  C21D2211/002 ,  C21D2211/004 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58 ,  C23C8/26 ,  C23C8/32

摘要： Disclosed is a steel for nitrocarburizing whose mechanical workability before nitrocarburizing treatment is guaranteed by ensuring fatigue resistance without causing the steel to harden before subjection to nitrocarburizing treatment, and a method of producing the same. The steel for nitrocarburizing has a chemical composition that contains C: 0.01 % or more and less than 0.20 %, Si: 1.0 % or less, Mn: 1.5 % or more and 3.0 % or less, P: 0.02 % or less, S: 0.06 % or less, Cr: 0.30 % or more and 3.0 % or less, Mo: 0.005 % or more and 0.40 % or less, V: 0.02 % or more and 0.5 % or less, Nb: 0.003 % or more and 0.20 % or less, Al: 0.010 % or more and 2.0 % or less, Ti: more than 0.005% and less than 0.025 %, N: 0.0200 % or less, Sb: 0.0005 % or more and 0.02 % or less, and the balance consisting of Fe and incidental impurities, with the chemical composition satisfying a predetermined relation; and a steel microstructure that contains bainite phase in an area ratio of more than 50 %.

公开(公告)号：EP1354971A4

公开(公告)日：2006-01-04

申请号：EP02716355

申请日：2002-01-24

申请人： JFE STEEL CORP ,  KOYO SEIKO CO

发明人： MATSUZAKI AKIHIRO ,  IWAMOTO TAKASHI ,  YAMAZAKI YOSHIO ,  KIZAWA KATSUHIKO ,  GOTO MASAO

IPC分类号： C22C38/00 ,  C21D9/40 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  C22C38/60

CPC分类号： C22C38/002 ,  C21D9/40 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  C22C38/60 ,  F16C33/121

摘要： A steel for a bearing, characterized in that the steel has a chemical composition in mass %: C: 0.95 to 1.10 %, Si: 0.15 to 0.70 %, Mn: 1.15 % or less, Cr: 0.90 to 1.60 %, P: 0.025 % or less, S: 0.025 %, O: 0.0012 % and the balance: Fe and inevitable impurities (S and O are elements forming non-metallic inclusions), in that the maximum diameter of oxide type non-metallic inclusions is more than 10 mu m and not more than 15 mu m in the case of an examination area of 320 mm and the number of inclusions having a diameter of a corresponding circle of 3 mu m or more is 250 or less in the case of an examination area of 320 mm , and in that the steel contains 0.020 mass % or less of AlN and/or the number of sulfide type non-metallic inclusions having a thickness of 1 or more is 1200 or less in the case of an examination area of 320 mm . The steel for a bearing can be produced without the use of a special secondary refining process at a low cost and also has a long life, and thus can be used for general use. ( mu m)

公开(公告)号：EP3040437A4

公开(公告)日：2016-12-21

申请号：EP14840690

申请日：2014-07-10

申请人： JFE STEEL CORP

发明人： IMANAMI YUTA ,  IWAMOTO TAKASHI ,  UWAI KIYOSHI

IPC分类号： C23C8/02 ,  C21D1/06 ,  C21D9/32 ,  C22C38/00 ,  C22C38/32 ,  C22C38/60 ,  C23C8/22

CPC分类号： B21K1/30 ,  C21D1/06 ,  C21D1/26 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D9/32 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/60 ,  C23C8/02 ,  C23C8/22 ,  F16H55/06 ,  F16H55/17

摘要： A mechanical structural component is a toothed component obtained by performing cold forging and carburizing treatment on a steel having a chemical composition that includes, in % by mass: 0.10% to 0.35% C; 0.01% to 0.13% Si; 0.30% to 0.80% Mn; 0.03% or less P; 0.03% or less S; 0.01% to 0.045% Al; 0.5% to 3.0% Cr; 0.0005% to 0.0040% B; 0.003% to 0.080% Nb; and 0.0080% or less N, wherein Ti mixed in the chemical composition as an impurity is limited to 0.005% or less, and the chemical composition has a balance including Fe and incidental impurities, in prior austenite grains after the carburizing treatment, an area ratio of crystal grains of 50 µm or less is 80% or more, and an area ratio of crystal grains exceeding 300 µm is 10% or less, and a total helix deviation of teeth after the carburizing treatment satisfies Formula (1) B max / L × 10 3 ‰¤ 5 where B max is a maximum total helix deviation in all teeth in mm, and L is a face width in mm. Such a toothed mechanical structural component has excellent dimensional accuracy.

公开(公告)号：EP2878695A4

公开(公告)日：2015-12-30

申请号：EP13823507

申请日：2013-07-22

申请人： JFE STEEL CORP ,  JFE BARS & SHAPES CORP

发明人： OMORI YASUHIRO ,  UWAI KIYOSHI ,  MITAO SHINJI ,  IWAMOTO TAKASHI ,  ANDO KEISUKE ,  TOMITA KUNIKAZU

IPC分类号： C22C38/22 ,  C21D1/06 ,  C21D6/00 ,  C21D8/06 ,  C21D9/32 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/60 ,  C23C8/04 ,  C23C8/32

CPC分类号： C23C8/32 ,  C21D1/06 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D8/06 ,  C21D8/065 ,  C21D9/32 ,  C21D2211/002 ,  C21D2211/004 ,  C22C38/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/60 ,  C23C8/04

摘要： The present invention provides a steel for nitrocarburizing having excellent mechanical workability before nitrocarburizing, and showing excellent fatigue properties after nitrocarburizing, which is suitable for applying in mechanical structural components for automobiles etc. prepared by adjusting the composition so that it contains in mass%, C: 0.01 % or more and less than 0.10 %, Si: 1.0 % or less, Mn: 0.5 % to 3.0 %, P: 0.02 % or less, S: 0.06 % or less, Cr: 0.3 % to 3.0 %, Mo: 0.005 % to 0.4 %, V: 0.02 % to 0.5 %, Nb: 0.003 % to 0.15 %, Al: 0.005 % to 0.2 %, and Sb: 0.0005 % to 0.02 %, and the balance including Fe and incidental impurities, and setting the area ratio of bainite phase to the whole microstructure to more than 50 %.

公开(公告)号：EP2816128A4

公开(公告)日：2015-05-20

申请号：EP13748467

申请日：2013-02-15

申请人： JFE BARS & SHAPES CORP ,  JFE STEEL CORP

发明人： IWAMOTO TAKASHI ,  ANDO KEISUKE ,  TOMITA KUNIKAZU ,  OMORI YASUHIRO ,  UWAI KIYOSHI ,  MITAO SHINJI

IPC分类号： C22C38/00 ,  C21D6/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/60 ,  C23C8/32

CPC分类号： C23C8/32 ,  C21D6/002 ,  C21D2211/002 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/60

摘要： According to the present invention, it is possible to obtain steel for nitrocarburizing having a predetermined chemical composition, a bainite area ratio exceeding 50 % and excellent machinability by cutting before nitrocarburizing, and having strength and toughness equivalent to conventional steel, such as SCr420 carburized steel material, and excellent fatigue properties after nitrocarburizing.