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71. 发明专利

JPH10196697A HIGH STRENGTH SPRING WITH EXCELLENT ENVIRONMENTAL BRITTLENESS RESISTANCE 失效
公开(公告)号：JPH10196697A
公开(公告)日：1998-07-31
申请号：JP327197
申请日：1997-01-10
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： F16F1/02 , C22C38/00 , C22C38/12 , C23F13/00
摘要： PROBLEM TO BE SOLVED: To secure high strength and high environmental brittleness resistance by covering at least a part of the surface of a spring steel base material with a corrosion protective film functioning as a sacrifice anode and adding carbonitride forming elements in the spring steel base material. SOLUTION: Spring steel provided with a tensile strength of 1800MPa or more is used as a base material, and at least a part of the surface of the spring steel base material is covered with a corrosion protective film functioning as a sacrifice anode. In this way, a high stress spring can be electrochemically protected from corrosion effectively. However, hydrogen is generated when the spring steel base material is electrochemically protected from corrosion by means of the sacrifice anode, and a detrimental action such as generation of delayed fracture and promotion of growth of a crack based on corrosion fatigue is exerted. Then, carbonitride forming elements such as Ti, Nb, Ta are added to the spring steel base material so that a great amount of fine carbonitride is deposited in the base material. As a result, impurities such as hydrogen and phosphorus penetrating into the base material can be trapped by means of the carbonitride, so that environmental brittleness can be suppressed.

72. 发明专利

JPH10121201A HIGH STRENGTH SPRING EXCELLENT IN DELAYED FRACTURE RESISTANCE 失效
公开(公告)号：JPH10121201A
公开(公告)日：1998-05-12
申请号：JP27103096
申请日：1996-10-14
申请人： KOBE STEEL LTD
发明人： SHIMOTSUSA MASAKI , IBARAKI NOBUHIKO , NAKAYAMA TAKENORI , IWATA TAKASHI , KAKOU HIROSHI , NANBA SHIGENOBU
IPC分类号： C22C38/00 , C22C38/14 , C22C38/56
摘要： PROBLEM TO BE SOLVED: To provide a high strength spring having extremely excellent delayed fracture resistance even if strength is increased to such a degree as to have >=HRC 50 material hardness after quench-and-temper treatment and also stress is increased. SOLUTION: This high strength spring has a tempered martensitic structure having >=HRC 50 hardness after quench-and-temper treatment. At this time, the amount of segregation of P in old austenitic grain boundaries, fractured in a chamber of the Auger apparatus and measured with this apparatus, is controlled to

73. 发明专利

JPH10102199A TRANSVERSE CONSTRAINT REINFORCING BAR FOR CONCRETE PIPE, WITH HIGH BENDING TOUGHNESS, REINFORCING BAR BASKET USING THE TRANSVERSE CONSTRAINT REINFORCING BAR, AND THEIR PRODUCTION 失效
公开(公告)号：JPH10102199A
公开(公告)日：1998-04-21
申请号：JP25616196
申请日：1996-09-27
申请人： NIPPON HUME PIPE , KOBE STEEL LTD , NISHIDA SEIKOSHO KK
发明人： TSUDA KAZUYOSHI , IBARAKI NOBUHIKO , OCHIAI KENJI , NISHIDA TAKAHARU , HAYATA MASASHI
IPC分类号： E04C5/06 , B21C1/00 , B21F31/00 , C21D8/08 , C22C38/00 , C22C38/06 , C22C38/38
摘要： PROBLEM TO BE SOLVED: To obtain the desired state of welding of a reinforcing bar basket by providing a hot rolling steel material with a composition into which specific weight percentages of C, Si, Mn, Al, and N are incorporated. SOLUTION: A steel, having a composition consisting of, by weight, 0.05-0.22% C, 0.5-2.0% Si, 0.5-2.0% Mn, =650N/mm yield point strength and 40-95% yield ratio. By this method, the rate of reduction in yield point strength, due to the welding of transverse constraint reinforcing bars, can be always maintained at a fixed value or below.

74. 发明专利

JPH09118957A HIGH-STRENGTH STEEL STRAND FOR PRESTRESSED CONCRETE AND ITS MANUFACTURE 失效
公开(公告)号：JPH09118957A
公开(公告)日：1997-05-06
申请号：JP22288296
申请日：1996-08-23
申请人： SHINKO WIRE CO LTD , KOBE STEEL LTD
发明人： YAMAOKA YUKIO , YAMADA MASAO , KODAMA MASARU , SUWA TOSHIKI , IBARAKI NOBUHIKO , SHIKAISO MASATO
IPC分类号： E04C5/08 , C21D8/06 , C21D9/52 , C22C38/00 , C22C38/04
摘要： PROBLEM TO BE SOLVED: To make a high-strength steel strand wire for prestressed concrete (PC) have tensile strength of >=235kgf/mm and elongagation of >=3.5% by executing aging treatment that is industrially suitable in stable properties. SOLUTION: Patenting treatment, wire drawing and wire stranding of a wire rod consisting of 0.80-1.30% C, 0.60-2.50% Si, 0.30-1.5% Mn, the balance Fe with inevitable impurities is executed. After that, by holding the wire at 200-600 deg.C for 2-1,500sec, imparting plastic elongation of 0.4-3.0% during holding it at that temp. and executing aging treatment for a proper time depending on imparted strain, the high-strength steel stranded wire for PC which consists of the mixed structure of fibrous cementite and granular cementite and has such properties as the volume rate of the granular cementite is 10-40% and its grain diameter is 40-300Å, tensile strength is >=235kgf/mm and elongation is >=3.5% is manufactured.

75. 发明专利

JP2500786B2 失效
公开(公告)号：JP2500786B2
公开(公告)日：1996-05-29
申请号：JP23657893
申请日：1993-09-22
申请人： KOBE STEEL LTD
发明人： MINAMIDA TAKAAKI , OCHIAI KENJI , MURAHASHI MAMORU , MIZUTANI KATSUJI , IBARAKI NOBUHIKO , OKI YASUHIRO , KATSUBE KOZO , SHOZAKI TAMOTSU , MITANI YOSHIHIRO
IPC分类号： B21C3/14 , B21C1/00 , B21C37/04 , C21D8/06 , C22C38/00 , C22C38/20

76. 发明专利

JPH0853737A HIGH STRENGTH AND HIGH TOUGHNESS HOT-DIP PLATED STEEL WIRE AND ITS PRODUCTION 失效
公开(公告)号：JPH0853737A
公开(公告)日：1996-02-27
申请号：JP18964494
申请日：1994-08-11
申请人： KOBE STEEL LTD
发明人： SHIKAISO MASATO , IBARAKI NOBUHIKO , OCHIAI KENJI
IPC分类号： C23C2/06 , C21D8/06 , C21D9/52 , C22C38/00
摘要： PURPOSE:To develop a high strength and high toughness hot-dip plated steel wire excellent in corrosion resistance by subjecting the hot rolled material of high carbon steel to patenting treatment, thereafter subjecting it to cold wire drawing to form into a steel wire, subjecting only the surface to tempering treatment and subsequently applying plating of Zn or the like thereto. CONSTITUTION:A high carbon steel contg., by weight, 0.7 to 1.2% C, 0.5 to 2.0% Si, 0.2 to 1.0% Mn, 0.02 to 0.07% Al and 0.003 to 0.015% N, furthermore contg. specified small amounts of one or more kinds among Cu, Cr, Ni, Co and W and moreover contg. one or more kinds among V, Nb, Ti and B is subjected to hot rolling to form into a wire rod. After that, it is subjected to patenting treatment or is subjected to patenting treatment after reaustenitization to form into a steel wire rod having a main structure of fine pearlite, which is thereafter subjected to cold wire drawing to form into a steel wire having a required diameter. Next, only the surface of the steel wire is subjected to heating and tempering treatment by the induction hardening method, etc., and is thereafter applied with galvanizing or Zn-Al allay plating. HV/TS, i.e., the average Vickers thickness of the steel wire stock to 50mum toward the center of the steel wire from the boundary of the plating layer and the steel wire stock to the tensile strength TS (kgf/mm ) of the plated steel wire is regulated to

77. 发明专利

JPH07179994A HYPER-EUTECTOID STEEL WIRE HAVING HIGH STRENGTH AND HIGH TOUGHNESS AND DUCTILITY AND ITS PRODUCTION 失效
公开(公告)号：JPH07179994A
公开(公告)日：1995-07-18
申请号：JP32526593
申请日：1993-12-22
申请人： KOBE STEEL LTD
发明人： SHIKAISO MASATO , IBARAKI NOBUHIKO , OKI YASUHIRO
IPC分类号： C21D8/06 , C21D9/52 , C22C38/00 , C22C38/06
摘要： PURPOSE:To produce a hyper-eutectoid steel wire having high toughness and high strength by hot-rolling a hyper-eutectoid steel stock of specific composition, properly regulating pearlite nodule size after patenting treatment, and properly controlling subsequent cold wiredrawing draft. CONSTITUTION:A stock of a hyper-eutectoid steel, which has a composition consisting of, by weight, 0.9-1.2% C, 0.5-2.0% Si, 0.2-1.0% Mn, >0.02-0.07% Al, 0.003-0.015% N, 200kgf/mm tensile strength and >30% fracture drawing can be produced.

78. 发明专利

JPH05202417A PRODUCTION OF STEEL WIRE FOR ULTRAHIGH STRENGTH SPRING 失效
公开(公告)号：JPH05202417A
公开(公告)日：1993-08-10
申请号：JP1157592
申请日：1992-01-27
申请人： KOBE STEEL LTD
发明人： NAGAMATSU TAKAHIKO , OKI YASUHIRO , IBARAKI NOBUHIKO
IPC分类号： C21D8/06 , C22C38/00 , C22C38/38
摘要： PURPOSE:To produce a steel wire for ultrahigh strength spring capable of being suitably used for the production of valve spring, etc., in internal combustion engine and having high toughness and ductility by specifying a composition and wiredrawing conditions. CONSTITUTION:A wire rod which has a composition consisting of, by weight, 0.30-0.80% C, 0.80-2.50% Si, 0.10-1.50% Mn,

79. 发明专利

JPH04371549A WIRE ROD EXTRA FINE STEEL WIRE WITH HIGH STRENGTH AND HIGH TOUGHNESS, EXTRA FINE STEEL WIRE WITH HIGH STRENGTH AND HIGH TOUGHNESS, STRANDED PRODUCT USING THE EXTRA FINE STEEL WIRE, AND PRODUCTION OF THE EXTRA FINE STEEL WIRE 失效
公开(公告)号：JPH04371549A
公开(公告)日：1992-12-24
申请号：JP34955191
申请日：1991-12-07
申请人： KOBE STEEL LTD
发明人： ASHIDA SHINZO , IBARAKI NOBUHIKO , MIZUTANI KATSUJI , OCHIAI KENJI
IPC分类号： B21C1/00 , B21C23/08 , C21D8/06 , C22C38/00 , C22C38/02 , C22C38/08 , C22C38/10 , C22C38/14
摘要： PURPOSE:To provide an extra fine steel wire suitable for reinforcement for rubber, such as belt cord and tire cord, or missile wire and having high strength and high toughness, a wire rod for extra fine steel wire used for producing the above-mentioned extra fine steel wire, a method therefor, a stranded product prepared by using the above-mentioned extra fine steel wire, etc. CONSTITUTION:The wire rod for extra fine steel wire has a composition consisting of, by weight, 0.85-1.2% C,

80. 发明专利

JPH0362769B2 失效
公开(公告)号：JPH0362769B2
公开(公告)日：1991-09-27
申请号：JP25605884
申请日：1984-12-04
申请人： KOBE STEEL LTD
发明人： AOKI MATSUHIDE , ISHIGAMI OSAMU , IBARAKI NOBUHIKO , TAKAGI WATARU , KAWASAKI SHOZO , OONISHI TOSHASU
IPC分类号： C21C7/076 , C22C38/00 , C22C38/04

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