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1. 发明专利

JP2002194503A STEEL TUBE WITH SUPERIOR BUCKLING RESISTANCE, AND PRODUCTION METHOD AND EVALUATION SYSTEM FOR THE SAME 失效
公开(公告)号：JP2002194503A
公开(公告)日：2002-07-10
申请号：JP2000400636
申请日：2000-12-28
申请人： NIPPON KOKAN KK
发明人： ENDO SHIGERU , ISHIKAWA NOBUYUKI , SUZUKI NOBUHISA , KONDO JO
IPC分类号： G01N3/08 , C21D8/10 , C22C38/00 , C22C38/04 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a steel tube with superior buckling resistance together with the production method and evaluation system for the same. SOLUTION: This steel tube having superior buckling resistance is characterized in that the stress ratio (σr-C) which is a ratio of the yield strength and the stress (σ1.5) at the nominal distortion of 1.5% in the steel tube tensile test in the tube's circumferential direction is 1.05 or greater and/or that the stress ratio (σr-L) which is a ratio of the yield strength and the stress (σ1.5) at the nominal distortion of 1.5% in the steel tube tensile test in the tube's axial direction is 1.05 or greater. Furthermore, the steel tube may contain at mass% C: 0.03-0.1%, Si: 0.05-0.5%, Mn: 1-2% and the remainder substantially consisting of Fe, with PCM value shown by the formula, PCM=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5×B, satisfying the range of 0.10-0.20.

2. 发明专利

JPH1157838A PRODUCTION OF THICK STEEL PLATE SUPERIOR IN LASER CUTTING 失效
公开(公告)号：JPH1157838A
公开(公告)日：1999-03-02
申请号：JP24021797
申请日：1997-08-22
申请人： NIPPON KOKAN KK
发明人： KIBE HIROSHI , FUJIBAYASHI TERUO , KAMIOKA SATOSHI , ISHIKAWA NOBUYUKI , KABASAWA MAKOTO
IPC分类号： B21B45/02 , C21D1/00 , C21D9/52 , C21D9/573
摘要： PROBLEM TO BE SOLVED: To add an even scale thickness superior in adherence and to improve laser cutting by cooling the steel plate with an injection of a water stream like a curtain against a steel plate in its width direction while moving at a high temperature. SOLUTION: After a hot rolling, the steel plate 1 is reheated in an austenite threshold. The water stream like a curtain (a continuous water stream runs without cutting on the steel surface) is sprayed from a slit nozzle 4 arranged in a slit shape towards a width direction of the plate 1 against the steel plate 1. The slit nozzles 4 in a cooling zone are arranged 20 units each on the upper and the bottom face of the steel plate 1 and cool the plate from the both faces, the upper and bottom. It is desirable that all the cooling zones are of the same cooling system. A slit shape nozzle is desirable for obtaining a water stream like a curtain, but the nozzle shape is not specifically limited as long as a water stream like a curtain is obtainable on the steel plate 1 surface. A thickness of the steel plate 1 to be manufactured is desirous to be 6 mm or more wherein a generation of Fe3 O4 is easy.

3. 发明专利

JPH1112680A STEEL MEMBER HAVING EXCELLENT BUCKLING RESISTING CHARACTERISTIC AND FIRE RESISTANCE 失效
公开(公告)号：JPH1112680A
公开(公告)日：1999-01-19
申请号：JP17022097
申请日：1997-06-26
申请人： NIPPON KOKAN KK
发明人： SUZUKI SHINICHI , ENDO SHIGERU , ISHIKAWA NOBUYUKI
IPC分类号： C22C38/00 , C22C38/12 , C22C38/14
摘要： PROBLEM TO BE SOLVED: To obtain the steel member having excellent fire resistance and difficult to generate a local buckling against the large compressive load acting in the case of a large earthquake even when the ratio of width to thickness is large and a stiffener does not exist by using the steel containing the specified quantity of Mo and becoming positive in the grade of the nominal stress/nominal strain within the range of the specified strain quantity. SOLUTION: This steel member is made of the steel containing, by wt., 0.05-0.70% Mo, if necessary, containing one kind or more of 0.005-0.10% each of Nb, V, Ti, and becoming positive in the grade of the nominal stress/nominal strain even in any strain quantities from the yield point to the strain quantity of 5% in the nominal stress- nominal strain curve obtained with the tension test. When the grade of the nominal stress/nominal strain becomes zero or negative, deformation is locally generated, whereby the local buckling is easily generated. Also, although the relation of the nominal stress-nominal strain in the area of small strain is important in order to restrain the local buckling, since the grade of nominal stress/nominal strain is always positive until the yield point and the quantity of strain have only to be positive within the range of up to 5%, the range becoming positive is specified to be the above range.

4. 发明专利

JPH1112648A STEEL EXCELLENT IN BUCKLING RESISTANCE AND FIRE RESISTANCE 失效
公开(公告)号：JPH1112648A
公开(公告)日：1999-01-19
申请号：JP17021897
申请日：1997-06-26
申请人： NIPPON KOKAN KK
发明人： SUZUKI SHINICHI , ENDO SHIGERU , ISHIKAWA NOBUYUKI
IPC分类号： C21D8/00 , C22C38/00 , C22C38/12 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide the steel which is difficult to generate the local buckling even in the case of large width/thickness or without a stiffener against large compression load to be exerted during a large earthquake, and excellent in fire resistance by hot rolling the steel of the prescribed composition, and cooling it in an accelerated manner from the prescribed temperature range to be determined by the composition of the steel at the prescribed speed to realize two- phase structure of ferrite + bainite or martensite. SOLUTION: The steel containing, by weight, 0.03-0.25% C, 0.5-2.0 Mn, and 0.05-0.70 Mo, and as necessary, 0.01-1.0% Si, 0.05-0.50% Cu, Ni and Cr, respectively, and one or more kinds of 0.005-0.10% Nb, V and Ti, respectively, is hot rolled. Then, the steel is cooled from the temperature range of (Ar3 +40)-(Ar3 -80) deg.C at the cooling speed of >=2 deg.C/second. The transformation point is obtained from the formula: Ar3 ( deg.C)=910-310C(%)-80Mn(%)-20Cu(%)-15Cr(%)-55Ni(%)-80Mo(%).

5. 发明专利

JPH116032A EARTHQUAKE-PROOF WELDED STEEL TUBE EXCELLENT IN LOCAL BUCKLING RESISTANCE, AND ITS PRODUCTION 失效
公开(公告)号：JPH116032A
公开(公告)日：1999-01-12
申请号：JP16089297
申请日：1997-06-18
申请人： NIPPON KOKAN KK
发明人： ENDO SHIGERU , DOI MASAMITSU , ISHIKAWA NOBUYUKI
IPC分类号： C21D8/10 , C22C38/00
摘要： PROBLEM TO BE SOLVED: To provide an earthquake-proof steel tube hardly causing local buckling at the time of big earthquake. SOLUTION: This steel tube is an earthquake-proof welded steel tube produced by using a hot rolled steel plate as a material and has a chemical composition which contains, by weight, 0.03-0.15% C, 1.0-2.0% Mn, and one or more kinds among 0.05-0.50% Cu, 0.05-0.50% Ni, 0.05-0.50% Cr, 0.05-0.50% Mo, 0.005-0.10% Nb, 0.005-0.10% V, and 0.005-0.080% Ti and in which the value of PCM, represented by equation PCM=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+ Mo/15+V/10+5×B (where the symbol of element stands for the weight percentage of each element), is regulated to 0.10-0.25. Further, the work hardening index at the tensile test in a tube-axis direction is >=0.10.

6. 发明专利

JPH10330884A STEEL MEMBER EXCELLENT IN BUCKLING RESISTANCE 失效
公开(公告)号：JPH10330884A
公开(公告)日：1998-12-15
申请号：JP14406897
申请日：1997-06-02
申请人： NIPPON KOKAN KK
发明人： ISHIKAWA NOBUYUKI , DOI MASAMITSU , ENDO SHIGERU
IPC分类号： C22C38/00 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To obtain a steel member hardly causing local buckling, suited to steel-frame buildings, etc., and excellent in earthquake resistance by hot-rolling a steel having a specific composition containing C and Mn and then carrying out cooling at specific cooling velocity from the temp. region determined by the components of the steel. SOLUTION: A steel, having a composition containing, by weight, 0.03-0.25% C and 0.5-2.0% Mn, is hot-rolled and then cooled at >=2 deg.C/sec cooling rate from the temp. region of (Ar3 +40) to (Ar3 -80) deg.C, determined by steel components. The above Ar3 transformation temp. is determined by the following equation: Ar3 ( deg.C)=910-310C(%)-80Mn(%)-20Cu(%)-15Cr(%)-55Ni(%)-80Mo(%). By using the resultant steel stock, the steel member for beams and pillars of a steel-frame building, iron bridges, etc., can be obtained. This steel member has a metallic structure composed of ferrite, bainite, etc., and having 10-80% ferrite area ratio. Moreover, the minimum gradient of the nominal stress-nominal strain curve is positive, and this steel member is increased in buckling strain and has excellent buckling resistance.

7. 发明专利

JPH10204574A HIGH TENSILE STRENGTH STEEL EXCELLENT IN EARTHQUAKE RESISTANCE 失效
公开(公告)号：JPH10204574A
公开(公告)日：1998-08-04
申请号：JP1257097
申请日：1997-01-27
申请人： NIPPON KOKAN KK
发明人： ISHIKAWA NOBUYUKI , KOBAYASHI YASUO , MORIYA YUTAKA
IPC分类号： C22C38/00 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To obtain a high tensile strength steel showing specified value or above of reduction of area in a prescribed tensile test and excellent in brittle fracture resistance under high speed deformation caused by a big earthquake and weldability by specifying the compsn. consisting of C, Si, Mn, Ni, Cr, Mo, Nb, Al, N, S, O, B, and Fe. SOLUTION: A steel having a compsn. contg, by weight, 0.07 to 0.1% C, 0.01 to 0.4% Si, 0.5 to 1.5% Mn, 0.5 to 2% Ni, 0.1 to 1% Cr, 0.2 to 1% Mo, 0.003 to 0.05% Nb, 0.01 to 0.08% Al, 0.0005 to 0.008% N, =30% value of reduction area under static loading conditions in a tensile test using a test pierce having a notch in which the stress concentration factor is regulated to >=5.

8. 发明专利

JPH10195596A STEEL PLATE EXCELLENT IN LASER BEAM CUTTABILITY 失效
公开(公告)号：JPH10195596A
公开(公告)日：1998-07-28
申请号：JP1452997
申请日：1997-01-10
申请人： NIPPON KOKAN KK
发明人： ISHIKAWA NOBUYUKI , KABASAWA MAKOTO , KAIZU TORU
IPC分类号： C22C38/00 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a thick steel plate capable of obtaining a good cut quality and workability in laser beam cutting for a thick steel plate used for industrial equipment and steel structures. SOLUTION: This steel plate has a compsn. contg., by weight, 0.05 to 0.20% C, 0.05 to 0.50% Si, 0.5 to 2.0% Mn and 0.005 to 0.05% Al, in which the content of P is regulated to

9. 发明专利

JPH1068043A FIRE RESISTANT STEEL MATERIAL FOR STRUCTURAL PURPOSE, EXCELLENT IN BRITTLE FRACTURE RESISTANCE UNDER HIGH SPEED DEFORMATION 失效
公开(公告)号：JPH1068043A
公开(公告)日：1998-03-10
申请号：JP13505397
申请日：1997-05-26
申请人： NIPPON KOKAN KK
发明人： ISHIKAWA NOBUYUKI , KOBAYASHI YASUO
IPC分类号： C22C38/00 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To improve brittle fracture resistance under high speed deformation while keeping fire resistance by strictly limiting S content or O content in a structural steel material of specific composition and specifying the value of reduction of area under static loading condition. SOLUTION: The fire resistant steel materiel for structural purpose has a composition in which the contents of C, Si, Mn, Al, Mo, S, and O are controlled, by weight ratio, to 0.03-0.20%, 0.05-2.0%, 0.3-2.0%, 0.001-0.1%, 0.1-0.7%, =2 kinds among 0.005-0.2% Nb, 0.01-0.3% V, and 0.003-0.1% Ti are further incorporated. This steel material has a value of reduction of area of >=30% under static loading condition in the tensile test using a test piece having a notch giving >=5 stress concentration factor. Further, one or >=2 kinds among 0.02-1.5% Cu, 0.02-1.5% Ni, 0.02-1.5% Cr, 0.003-0.3% Zr, and 0.0005-0.005% B are incorporated into the steel composition, if necessary.

10. 发明专利

JP2003138341A HIGH STRENGTH STEEL SHEET HAVING EXCELLENT HIC RESISTANCE, AND PRODUCTION METHOD THEREFOR 审中-公开
公开(公告)号：JP2003138341A
公开(公告)日：2003-05-14
申请号：JP2001335157
申请日：2001-10-31
申请人： NIPPON KOKAN KK
发明人： ISHIKAWA NOBUYUKI , ENDO SHIGERU , SHINGU TOYOHISA , SUWA MINORU
IPC分类号： C21D8/02 , C22C38/00 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high strength steel sheet of a grade of API X80 or above which exhibits excellent resistance to HIC (hydrogen induced cracking) in a central segregated part, and HIC occurring from the vicinity of the surface and inclusions without undergoing the addition of large quantities of alloy elements. SOLUTION: The high strength steel sheet has a composition containing, by mass, 0.02 to 0.08% C, 0.01 to 0.50% Si, 0.5 to 1.8% Mn, 0.04 to 0.10% Ti and 0.01 to 0.07% Al, and the balance substantially Fe, and in which C/(Mo+Ti) as the ratio of the C content to the total content of Mo and Ti by atomic % is 0.5 to 3.0, and has a metallic structure substantially consisting of a ferritic single phase, and in which precipitates containing Ti and Mo are dispersedly precipitated.

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