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41. 发明专利

JP2002241899A HIGH STRENGTH STEEL WIRE HAVING EXCELLENT DELAYED FRACTURE RESISTANCE AND EXCELLENT FORGING PROPERTY AND MANUFACTURING METHOD THEREFOR 失效
公开(公告)号：JP2002241899A
公开(公告)日：2002-08-28
申请号：JP2001034334
申请日：2001-02-09
申请人： KOBE STEEL LTD
发明人： NAMIMURA YUICHI , IBARAKI NOBUHIKO
IPC分类号： C21D8/06 , C21D9/52 , C22C38/00 , C22C38/04 , C22C38/18
摘要： PROBLEM TO BE SOLVED: To provide a high strength steel wire having excellent delayed fracture resistance and excellent forging property though having >=1,200 N/mm2 tensile strength, and a useful method of manufacturing the high strength steel wire. SOLUTION: The steel wire is composed of a steel containing 0.7-1.2% C and has a bainite structure having >=80% area ratio and the tensile strength of >=1,200 N/mm2 and excellent delayed fracture resistance are attained by strongly drawing a steel wire.

42. 发明专利

JP2001279381A ULTRA FINE STEEL WIRE HAVING HIGH STRENGTH AND HIGH TOUGHNESS AND EXCELLENT IN LONGITUDINAL CRACK RESISTANCE, AND ITS MANUFACTURING METHOD 失效
公开(公告)号：JP2001279381A
公开(公告)日：2001-10-10
申请号：JP2000091980
申请日：2000-03-29
申请人： KOBE STEEL LTD
发明人： OCHIAI KENJI , IBARAKI NOBUHIKO , INADA ATSUSHI
IPC分类号： C21D7/02 , C22C38/00 , C22C38/20
摘要： PROBLEM TO BE SOLVED: To provide an ultra fine steel wire having high strength and high toughness, preferably having >=3,720 N/mm2 tensile strength, and excellent in longitudinal crack resistance. SOLUTION: The residual stress in the surface of the ultra fine steel wire is regulated to =3.3 true strain and further skin pass rolling to regulate the residual stress in the surface of the resultant steel wore so that it satisfies the above condition.

43. 发明专利

JP2000282177A STEEL FOR PISTON RING 失效
公开(公告)号：JP2000282177A
公开(公告)日：2000-10-10
申请号：JP9625899
申请日：1999-04-02
申请人： KOBE STEEL LTD
发明人： KURODA TAKESHI , IBARAKI NOBUHIKO , YOSHIHARA SUNAO
IPC分类号： F02F5/00 , C22C38/00 , C22C38/34 , C22C38/46 , C22C38/54 , F16J9/26
摘要： PROBLEM TO BE SOLVED: To provide a steel for piston ring having high performance capable of dealing with the lightening of piston ring and the reduction of its cost. SOLUTION: The steel subjected to cold working and nitriding treatment and used for a piston ring contains, by weight, 0.50 to 0.80% C, 1.55 to 3.00% Si, 0.20 to 1.50% Mn, 0.60 to 2.00% Cr, 0.05 to 1.00% V, and the balance Fe with inevitable impurities. In the cross section in the rolling direction including the center part of the steel, the max. thicknes of oxide-based inclusions in which the content of Al or Si is >=80%, is controlled to

44. 发明专利

JPH10296534A ULTRA FINE STEEL WIRE FOR WIRE SAW 失效
公开(公告)号：JPH10296534A
公开(公告)日：1998-11-10
申请号：JP10931897
申请日：1997-04-25
申请人： KOBE STEEL LTD
发明人： MINAMIDA TAKAAKI , IBARAKI NOBUHIKO
IPC分类号： B23D61/18 , C22C38/00 , C22C38/06
摘要： PROBLEM TO BE SOLVED: To improve a cutting yield greatly and secure stable cutting face precision so as to carry out high speed cutting by specifying a line shape and tensile strength of a steel wire consisting of specific constituents such as C, Si, Fe. SOLUTION: This wire contains 0.48-0.90 mass % of C, 0.10-0.50 mass % of Si, 0.15-0.60 mass % of Mn, contents of P, S, Al are limited at most 0.02%, 0.02%, 0.003 mass % individually, an the rest is constructed of Fe and unavoidable impurities. This steel wire is provided with tensile strength MPa satisfying an expression: TS>=-1402×logD+5744, when a final wire diameter is represented by D. The ultra fine steel wire satisfying this required condition is provided with a wire diameter of 15-80 μm, high strength, and high toughness and dutility, so that a cutting yield can be improved while stable cutting face precision can be secured, and cutting can be carried out at high speed. The minimum wire diameter of the steel wire, in which no breakage due to an inclusion is caused, is 15 μm.

45. 发明专利

JPH10287958A HIGH STRENGTH SPRING EXCELLENT IN IMMUNITY TO ENVIRONMENTAL EMBRITTLEMENT 失效
公开(公告)号：JPH10287958A
公开(公告)日：1998-10-27
申请号：JP10057397
申请日：1997-04-17
申请人： KOBE STEEL LTD
发明人： NAKAYAMA TAKENORI , IWATA TAKASHI , SHIMOTSUSA MASAKI , IBARAKI NOBUHIKO , KAKOU HIROSHI , NANBA SHIGENOBU
IPC分类号： C21D9/02 , C22C38/00 , C22C38/14 , C23F15/00
摘要： PROBLEM TO BE SOLVED: To provide a high strength spring excellent in immunity to environmen tal embrittlement, having high strength and also having high environmental embrittlement resistance (characteristic of hardly causing environmental embrittlement, such as corrosion fatigue and delayed fracture). SOLUTION: Components of the rust formed on the surface of a spring steel, as a base material, having >=1800 MPa tensile strength are regulated so that the fraction of the amorphous components, determined by an X-ray diffraction method, becomes >=50% by mass. By this procedure, the rust formed on the surface of the spring steel as a base material becomes dense and minimal in defects, and the formation of corrosion pits which become the origin of corrosion fatigue and delayed fracture and the generation of hydrogen causing crack propagation can be inhibited, and as a result, resistance to environmental embrittlement can be improved.

46. 发明专利

JPH10121199A STEEL WIRE WITH HIGH STRENGTH AND HIGH TOUGHNESS, AND ITS PRODUCTION 失效
公开(公告)号：JPH10121199A
公开(公告)日：1998-05-12
申请号：JP8132497
申请日：1997-03-31
申请人： KOBE STEEL LTD
发明人： MAKII KOICHI , KAKOU HIROSHI , IBARAKI NOBUHIKO , MINAMIDA TAKAAKI , SHIKAISO MASATO
IPC分类号： C21D8/06 , C21D8/08 , C21D9/52 , C22C38/00
摘要： PROBLEM TO BE SOLVED: To provide a steel wire having high strength and high toughness, having strength and toughness higher than those of a steel wire in which lamellar cementite is composed of nano-crystal and free from the occurrence of longitudinal crack at the time of twisting, etc., and its production. SOLUTION: This steel wire is composed essentially of fine pearlite and/or pseudo-pearlite, and lamellar cementite in the structure is amorphous. Further, in the case of a steel wire composed essentially of bainite, cementite in the structure is amorphous. At the time of producing these steel wires, a method where patenting treatment and cold wiredrawing are repeated plural times and final wiredrawing is performed under cooling while regulating the value of true strain to >=2.0 is adopted.

47. 发明专利

JPH10110247A SPRING STEEL EXCELLENT IN HYDROGEN EMBRITTLEMENT RESISTANCE AND FATIGUE CHARACTERISTIC 失效
公开(公告)号：JPH10110247A
公开(公告)日：1998-04-28
申请号：JP28431596
申请日：1996-10-25
申请人： KOBE STEEL LTD
发明人： NANBA SHIGENOBU , KAKOU HIROSHI , SHIMOTSUSA MASAKI , IBARAKI NOBUHIKO , NAKAYAMA TAKENORI , IWATA TAKASHI , YAMAMOTO YOSHINORI , OKOCHI NORIO , NAGAO MAMORU , INADA ATSUSHI , KURODA TAKESHI
IPC分类号： C22C38/00 , C22C38/14 , C22C38/60
摘要： PROBLEM TO BE SOLVED: To produce an infiltrated-hydrogen-capturing effect in a corrosive environment and to improve corrosion fatigue characteristic by adding carbide-, nitride-, and sulfide-forming elements to a spring steel and dispersing their precipitates finely into the material. SOLUTION: At least one kind selected from the group consisting of, by mass, =0.001%, and, in the case of single addition of Mo alone, Mo is incorporated by 0.05%, and further, 1-200ppm N and 300ppm S are incorporated. Simultaneously, precipitates of

48. 发明专利

JPH09109609A TIRE RUBBER REINFORCING STEEL CORD AND TIRE 失效
公开(公告)号：JPH09109609A
公开(公告)日：1997-04-28
申请号：JP27000095
申请日：1995-10-18
申请人： KOBE STEEL LTD
发明人： SAKASHITA SHINJI , NAKAYAMA TAKENORI , IBARAKI NOBUHIKO , OCHIAI KENJI
IPC分类号： B60C9/00
摘要： PROBLEM TO BE SOLVED: To improve corrosion fatigue characteristics and corrosion resistance by forming a steel cord by an element wire whose diameter is specified mmϕ. SOLUTION: A tire rubber reinforcing steel cord is formed of an element wire whose diameter is 0.4mmϕ or more. In the tire rubber reinforcing steel cord, the element wire may have the chemical component: C of 0.50 to 1.30wt.%, Si of 2.00wt.% or less, Mn of 1.00wt.% or less, Cu of 0.05 to 0.50wt.%, the residual of Fe or unavoidable impurity. In addition to this chemical component, the element wire may contain at least one kind of La of 0.001 to 0.050wt.% and Ce of 0.001 to 0.050wt.%, and/or one or more component in the group formed of Ti of 0.001 to 0.20wt.%, V of 0.01 to 0.50wt.%, Nb of 0.001 to 0.50wt.%, Cr of 0.05 to 3.00wt.%, Mo of 0.01 to 0.50wt.%, W of 0.01 to 0.50wt.%, Ni of 0.05 to 1.00wt.%, Co of 0.01 to 0.50wt.%.

49. 发明专利

JPH0949018A PRODUCTION OF STEEL WIRE FOR REINFORCING RUBBER 失效
公开(公告)号：JPH0949018A
公开(公告)日：1997-02-18
申请号：JP25538795
申请日：1995-10-02
申请人： KOBE STEEL LTD
发明人： SHIKAISO MASATO , IBARAKI NOBUHIKO , OCHIAI KENJI
IPC分类号： B21B3/00 , C21D8/06 , C22C38/00 , C22C38/04 , C22C38/52
摘要： PROBLEM TO BE SOLVED: To produce a steel wire for reinforcing rubber, having excellent mechanical properties, such as strength and tensile strength, even if patenting treatment is completely omitted in the course of a manufacturing process. SOLUTION: A wire bar of a steel, having a composition containing 0.35-0.9% C, 0.1-0.4% Si, 0.2-1.1% Mn, )

50. 发明专利

JPH08199395A EXTREMELY FINE STEEL WIRE EXCELLENT IN CORROSION FATIGUE-RESISTING CHARACTERISTIC 失效
公开(公告)号：JPH08199395A
公开(公告)日：1996-08-06
申请号：JP1018695
申请日：1995-01-25
申请人： KOBE STEEL LTD
发明人： SAKASHITA SHINJI , MIYAUCHI SHIGEAKI , NAKAYAMA TAKENORI , IBARAKI NOBUHIKO , OCHIAI KENJI
IPC分类号： B21F19/00 , C25D5/02 , C25D7/06
摘要： PURPOSE: To develop an extremely fine steel wire which is excellent in the corrosion fatigue-resisting characteristic without lowering the strength of adhesion to rubber by scatteringly plating a special metal on the surface of an extremely fine steel wire as a reinforcing material for a tire cord, etc., and simultaneously, controlling the surface area to be plated to a specific region. CONSTITUTION: The extremely fine steel wire having a diameter of 0.20mm, for example, which is obtained by subjecting high carbon steel to hot rolling, primary wire drawing work, patenting treatment, secondary wire drawing work and patenting treatment again, is manufactured and the extremely fine-plated steel by scatteringly plating an alloy consisting of metal such as Cu, which is more noble than Fe, on the surface thereof at an area ratio of 10 to 95% is used as the reinforcing material for rubber products such as a rubber tire. The extremely fine steel wire for reinforcement of rubber products having the excellent corrosion fatigue-resisting characteristic without lowering the strength of adhesion to rubber is obtained.

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