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公开(公告)号：EP4421200A1
公开(公告)日：2024-08-28
申请号：EP22951910.3
申请日：2022-07-19
发明人： TAKANO, Kohji , SAKAI, Hiroki , AKIURA, Tsuneo , AKIZUKI,Takayuki
CPC分类号： Y02P10/20 , B21F3/02 , C21D8/06 , C21D9/02 , C22C38/00 , C22C38/06 , C22C38/34 , C22C38/02 , C22C38/04 , C22C38/58 , C22C38/44 , C22C38/48 , C22C38/50 , F16F1/04
摘要： A high-strength stainless-steel wire containing C, Si, Mn, P, S, Ni, Cr, N, Al, O, Ca, a total of Ti, Nb, Ta, and W of 0.50% or less, the balance of Fe and impurities, in which the value of Md30 represented by (1) is 0 to 30 (°C), a strength of the steel wire is 1,800 MPa or more, a deformation-induced martensite amount is 20 to 80 vol.%, and a tensile residual stress of a surface layer of the steel wire in a longitudinal direction is 500 MPa or less. Md30 (°C) = 551 - 462 (C + N) - 9.2Si - 8.1Mn - 29(Ni + Cu) - 13.7Cr - 18.5Mo ...(1) Here, an element symbol in Equation (1) is the (mass%) of each element in a chemical composition of a steel, and D is substituted in a case where the element is not contained.
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3.发明授权
公开(公告)号：EP2204463B1
公开(公告)日：2019-05-01
申请号：EP08846041.5
申请日：2008-10-27
IPC分类号： C22C38/00 , C22C38/38 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C21D8/00
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.
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公开(公告)号：EP3406747A1
公开(公告)日：2018-11-28
申请号：EP16886478.3
申请日：2016-12-02
发明人： TAKAOKA, Hiroyuki
摘要： The present invention relates to a high strength forged steel for use in producing a large forged product. The high strength forged steel comprises composition which comprises predetermined amounts of predetermined chemical elements and a balance being Fe and inevitable purities. A major constituent of a metallographic structure of the high strength forged steel comprises bainite, martensite or a combination thereof. An average crystal grain size in steel microstructures between a near-surface level and a mid level is less than or equal to 50 µm. The near-surface level is below a surface of the high strength forged steel at a distance of 5 mm and the mid level is below the surface of the high strength forged steel at a distance of one quarter of a thickness thereof. A difference between a peak value of a crystal grain size distribution at the near-surface level and a peak value of the crystal grain size distribution at the mid level is greater than or equal to 10 µm and less than or equal to 30 µm. For the high strength forged steel, it is preferred that the total index as determined in accordance with DIN 50602-1985, method K0 for evaluating non-metallic inclusions is less than or equal to 10.
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公开(公告)号：EP3382051A1
公开(公告)日：2018-10-03
申请号：EP16868681.4
申请日：2016-11-25
发明人： SHIGA Akira , HASEGAWA Hajime , KUBOTA Manabu , MIZUKAMI Hideo
CPC分类号： C23C8/22 , C21D1/06 , C21D8/005 , C21D8/06 , C21D9/28 , C21D9/32 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/54 , C22C38/60 , C23C8/32 , C23C8/80
摘要： A steel according to an aspect of the present invention has a chemical composition within a predetermined range, in which a hardenability index Ceq ranges from greater than 7.5 to smaller than 44.0, an AlN precipitation index I AlN ranges from greater than 0.00030 to smaller than 0.00110, a metallographic structure includes ferrite ranging from 85 to 100 area%, an average distance between sulfides, which are observed in a cross section parallel to a rolling direction of the steel and have an equivalent circle diameter ranging from 1 µm or greater to smaller than 2 µm, is shorter than 30.0 µm, and a presence density of the sulfides, which are observed in the cross section parallel to the rolling direction of the steel and have an equivalent circle diameter ranging from 1 µm or greater to smaller than 2 µm, is 300 pieces/mm 2 or more.
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公开(公告)号：EP3366799A1
公开(公告)日：2018-08-29
申请号：EP16857251.9
申请日：2016-09-30
发明人： SHIGA Akira , YOSHIDA Suguru , KUBOTA Manabu , HASEGAWA Hajime , MIZUKAMI Hideo
CPC分类号： C22C38/60 , C21D8/06 , C21D8/065 , C21D9/30 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/24 , C22C38/28 , C22C38/38
摘要： There is provided a hot forging steel including, by mass%, C: more than 0.30% and less than 0.60%, Si: 0.10% to 0.90%, Mn: 0.50% to 2.00%, S: 0.010% to 0.100%, Cr: 0.01% to 1.00%, Al: more than 0.005% and 0.100% or less, N: 0.0030% to 0.0200%, Bi: more than 0.0001% and 0.0050% or less, Ti: 0% or more and less than 0.040%, V: 0% to 0.30%, Ca: 0% to 0.0040%, Pb: 0% to 0.40%, and a remainder including Fe and impurities, in which P and O in the impurities are respectively P: 0.050% or less and O: 0.0050% or less, an expression d+3σ 2 or more in a cross section parallel to a rolling direction of a steel.
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7.发明授权
公开(公告)号：EP2639328B1
公开(公告)日：2018-05-30
申请号：EP11839745.4
申请日：2011-10-21
申请人： NHK Spring Co., Ltd.
发明人： OKADA, Hideki , TANGE, Akira , TANGO, Koichi , SUMIYOSHI, Isao
IPC分类号： C21D8/06 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/34 , C22C38/42 , F16F1/02 , C21D7/06 , C21D9/02 , C22C38/50 , C21D9/52 , C22C38/20 , C22C38/28 , C22C38/46
CPC分类号： F16F1/021 , C21D7/06 , C21D8/06 , C21D8/065 , C21D9/02 , C21D9/52 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/28 , C22C38/34 , C22C38/42 , C22C38/46 , C22C38/50 , F16F1/02
摘要： A steel for high-strength spring has an Ac 3 transformation temperature as an indicator of the decarburization performance, which is calculated by Equation (1) below, is from 859 to 885°C, a maximum hardened diameter DI as an indicator of the hardening performance, which is calculated by Equation (2) below, is from 70 to 238 mm, and a temper hardness HRC as an indicator of the spring performance, which is calculated by Equation (3) below, is from 50 to 55. wherein, D 0 = 8.65 × C , f Si =1+0.64×Si, f Mn =1+4.10×%Mn, f P =1+2.83×%P, f S =1-0.62×%S, f Cu =1+0.27×%Cu, f Ni =1+0.52×%Ni, and f Cr =1+2.33×%Cr.
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公开(公告)号：EP2985361B1
公开(公告)日：2018-03-14
申请号：EP14850316.2
申请日：2014-10-01
发明人： YUYA, Masato , HIGASHIDA, Masashi , MATSUMOTO, Hitoshi , HASEGAWA, Tatsuya , NEISHI, Yutaka , MAKINO, Taizo
IPC分类号： C22C38/00 , C22C38/60 , C21D8/06 , C22C38/02 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/28 , C22C38/38 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/50 , C22C38/58 , C21D9/00 , C21D1/06 , C21D1/18
CPC分类号： C22C38/58 , C21D1/06 , C21D1/18 , C21D8/06 , C21D9/0075 , C21D2211/002 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/28 , C22C38/38 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/50 , C22C38/60
摘要： An age-hardenable steel having a chemical composition consisting of: C: 0.05 to 0.20%, Si: 0.01 to 0.50%, Mn: 1.5 to 2.5%, S: 0.005 to 0.08%, Cr: 0.03 to 0.50%, Al: 0.005 to 0.05%, V: 0.25 to 0.50%, Mo: 0 to 1.0%, Cu: 0 to 0.3%, Ni: 0 to 0.3%, Ca: 0 to 0.005%, and Bi: 0 to 0.4%, with the balance being Fe and impurities, wherein within the impurities, P ‰¤ 0.03%, Ti
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9.发明公开
公开(公告)号：EP3289110A1
公开(公告)日：2018-03-07
申请号：EP16722535.8
申请日：2016-04-25
发明人： THYLÉN, Anders , WIKSTRÖM, Lars , HÖGBERG, Sofie , GREHK, Mikael
CPC分类号： C21D9/525 , C21D1/62 , C21D1/667 , C21D8/00 , C21D8/06 , C21D8/10 , C21D9/08 , C21D2201/00 , C22F1/002 , C22F1/02
摘要： A method of generating twin lamellas in a metal body includes the steps of introducing the metal body into a chamber, filling the chamber with a cooling medium having a temperature that will enable generation of twin lamellas in the metal body upon deformation thereof, and deforming the metal body while the latter is surrounded by the cooling medium. The cooling medium surrounds the metal body upon deformation of the latter is in a gaseous state. The present disclosure also relates to a device for generating twin lamellas in the metal body, the device including a chamber, a chamber inlet connected to a cooling medium source, and a deformation device arranged to deform the metal body. The deformation device is positioned inside the chamber so that the metal body will be surrounded by the cooling medium in a gaseous state while being deformed by the deformation device.
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公开(公告)号：EP3040435B9
公开(公告)日：2018-03-07
申请号：EP14839024.8
申请日：2014-06-18
发明人： EGASHIRA, Makoto , HORIKAMI, Sadanori , HIGASHIDA, Masashi , OKADA, Takahiro , NEISHI, Yutaka , HASEGAWA, Tatsuya , MATSUMOTO, Hitoshi
CPC分类号： C22C38/60 , B21B1/16 , B21B3/02 , B62D3/12 , C21D1/10 , C21D1/18 , C21D7/06 , C21D8/06 , C21D9/0075 , C21D9/28 , C21D2211/003 , C21D2211/005 , C21D2211/009 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/38 , C22C38/50 , C22C38/54 , C22C38/58 , Y02P10/253
摘要： A rolled round steel material for a steering rack bar contains C in an amount of 0.38 to 0.55%, Si in an amount of 1.0% or less, Mn in an amount of 0.20 to 2.0%, S in an amount of 0.005 to 0.10%, Cr in an amount of 0.01 to 2.0%, Al in an amount of 0.003 to 0.10%, B in an amount of 0.0005 to 0.0030%, Ti in an amount of 0.047% or less, Cu in an amount of 0 to 1.0%, Ni in an amount of 0 to 3.0%, Mo in an amount of 0 to 0.50%, Nb in an amount of 0 to 0.10%, V in an amount of 0 to 0.30%, Ca in an amount of 0 to 0.005%, and Pb in an amount of 0 to 0.30%, a remaining portion being constituted by Fe and an impurities, the impurities containing P in an amount of 0.030% or less and N in an amount of 0.008% or less, and has a chemical composition satisfying [3.4N‰¤Ti‰¤3.4N+0.02]. The microstructure is constituted by ferrite (F), lamellar pearlite (LP), and cementite (C), and in the latitudinal cross-section, in a region extending from a surface to a position located a distance of 1/2 the radius therefrom, the average particle diameter of F is 10 µm or less, the area percentage of LP is less than 20%, and the number of pieces of spheroidal cementite (SC) in C is 4×10 5 pieces/mm 2 or more, and, in a central portion, the area percentage of LP is 20% or more and the number of pieces of SC is less than 4×10 5 pieces/mm 2 , and in the longitudinal cross-section, the average aspect ratio of F in a region extending from a surface to a position located a distance of 1/2 the radius therefrom is 3 or more. This steel material has a high base material toughness and good machinability without performing thermal refining.
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