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1. 发明专利

JPH08134584A HIGH STRENGTH FERRITIC HEAT RESISTANT STEEL AND ITS PRODUCTION 失效
公开(公告)号：JPH08134584A
公开(公告)日：1996-05-28
申请号：JP27162394
申请日：1994-11-04
申请人： NIPPON STEEL CORP , BABCOCK HITACHI KK , FUJITA TOSHIO
发明人： HASEGAWA HIROSHI , NAOI HISASHI , FUJITA TOSHIO , TAMURA KOJI , SATO YASUSHI
IPC分类号： C22C29/06 , C21D6/00 , C21D8/00 , C22C38/00 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/52
摘要： PURPOSE: To produce a ferritic heat resistant steel excellent in HAZ softening resistance by specifying a composition consisting of C, Si, Mn, Cr, Mo, W, V, Nb, N, Ti, Zr, and Fe and controlling the composition of a carbide. CONSTITUTION: This steel has a composition which contains, by weight, 0.01-0.30% C, 0.02-0.80% Si, 0.20-1.50% Mn, 0.50-5.00% Cr, 0.01-1.50% Mo, 0.01-3.50% W, 0.02-1.00% V, 0.01-0.50% Nb, and 0.001-0.06% N and contains 0.001-0.8% Ti and 0.001-0.8% Zr independently or in combination and further contains, if necessary, 0.2-5.0% of Co and/or Ni and in which the contents of P, S, and O are limited to

2. 发明专利

JPH07242935A MARTENSITIC HEAT RESISTANT STEEL EXCELLENT IN HAZ SOFTENINING RESISTANCE AND ITS PRODUCTION 失效
公开(公告)号：JPH07242935A
公开(公告)日：1995-09-19
申请号：JP33792394
申请日：1994-12-27
申请人： NIPPON STEEL CORP , FUJITA TOSHIO
发明人： HASEGAWA HIROSHI , OGAMI MASAHIRO , MIZUHASHI NOBUO , NAOI HISASHI , FUJITA TOSHIO
IPC分类号： C21D8/00 , C21D6/00 , C22C38/00 , C22C38/28
摘要： PURPOSE:To produce a martensitic heat resistant steel excellent in HAZ softening resistance and showing high creep strength at a high temp. of >=550 deg.C. CONSTITUTION:This martensitic heat resistant steel excellent in HAZ softening resistance is one having a compsn. contg., by mass, 0.01 to 0.30% C, 0.02 to 0.80% Si, 0.20 to 1.00% Mn, 5.00 to 18.00% Cr, 0.005 to 1.00% Mo, 0.20 to 3.50% W, 0.02 to 1.00% V, 0.01 to 0.50% Nb and 0.01 to 0.25% N, furthermore contg., independently or compositely, one or >=two kinds among 0.005 to 2.O% Ti, 0.005 to 2.0%, Zr, 0.005 to 2.0% Ta and 0.005 to 2.0% Hf, and in which the value of (Ti%+Zr%+Ta%+Hf%) occupied in the metallic components M of M23C6 type carbides is regulated to 5 to 65%, and the method for producing the same in which Ti, Zr, Ta and Hf are added during 10min immediately before the discharge of the steel, moreover, cooling after solution heating treatment is temporarily stopped at 950 to 1000 deg.C, and it is held at the same temp. for 5 to 60min.

3. 发明专利

JPH10287960A HIGH CHROMIUM FERRITIC STEEL 失效
公开(公告)号：JPH10287960A
公开(公告)日：1998-10-27
申请号：JP10156297
申请日：1997-04-18
申请人： NIPPON STEEL CORP , FUJITA TOSHIO
发明人： HASEGAWA HIROSHI , OGAMI MASAHARU , NAOI HISASHI , FUJITA TOSHIO
IPC分类号： C22C38/00 , C22C38/26 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To provide a high strength high chromium ferritic steel as a material for a boiler tube, etc., capable of meeting the recent demand for high temp. and high pressure steam condition for the purpose of improvement of thermal efficiency at thermal power generation and resultant demand for so-called extra supercritical pressure condition. SOLUTION: This steel has a composition containing 0.01-0.08% C, 0.01-0.10% N,

4. 发明专利

JPH08225833A PRODUCTION OF MARTENSITIC HEAT RESISTANT STEEL EXCELLENT IN HIGH TEMPERATURE CREEP STRENGTH 失效
公开(公告)号：JPH08225833A
公开(公告)日：1996-09-03
申请号：JP2851895
申请日：1995-02-16
申请人： NIPPON STEEL CORP , FUJITA TOSHIO
发明人： HASEGAWA HIROSHI , OGAMI MASAHIRO , NAOI HISASHI , FUJITA TOSHIO
IPC分类号： C21D6/00 , C22C38/00 , C22C38/30 , C22C38/54
摘要： PURPOSE: To produce a martensitic heat resistant steel having high creep rupture strength by preventing the remarkable formation of retained austenite in a heat resistant steel largely contg. W and Co and having a martensitic single phase structure. CONSTITUTION: This heat resistant steel is produced in such a manner that a steel contg., by mass, 0.01 to 0.30% C, 0.01 to 0.80% Si, 0.20 to 1.50% Mn, 8.00 to =10min as primary treatment and holding at 750 to 800 deg.C for >=10min as secondary treatment. In this steel components, the content of P is regulated to

5. 发明专利

JPH07286247A HIGH STRENGTH FERRITIC HEAT RESISTANT STEEL 失效
公开(公告)号：JPH07286247A
公开(公告)日：1995-10-31
申请号：JP7854494
申请日：1994-04-18
申请人： NIPPON STEEL CORP , FUJITA TOSHIO
发明人： NAOI HISASHI , MIMURA HIROYUKI , ISHIZUKA TETSUO , FUJITA TOSHIO
IPC分类号： C22C38/00 , C22C38/54
摘要： PURPOSE:To produce a ferritic heat resistant steel having high strength and high toughness for a boiler steel tube used under ultrahigh critical pressure conditions. CONSTITUTION:A boiler material improved in toughness after aging and steam oxidation characteristic can be obtained by the proper addition of Si and Al to a ferritic heat resistant steel excellent in high temp. strength, in which the additive quantities of Mo and W are properly regulated and Co and B are actively used. This boiler material has a chemical composition containing 0.21-0.50% Si, 0.002-0.05% Al, 0.02- 0.5-1.5% Mo, >1.00-4.00% W, 0.05-0.30% V, 0.02-0.15% Nb,

6. 发明专利

JPH07286246A HIGH STRENGTH FERRITIC HEAT RESISTANT STEEL 失效
公开(公告)号：JPH07286246A
公开(公告)日：1995-10-31
申请号：JP7854394
申请日：1994-04-18
申请人： NIPPON STEEL CORP , FUJITA TOSHIO
发明人： NAOI HISASHI , MIMURA HIROYUKI , OGAMI MASAHIRO , FUJITA TOSHIO
IPC分类号： C22C38/00 , C22C38/52
摘要： PURPOSE:To produce a ferritic heat resistant steel having high strength and high toughness for boiler steel tube used under ultrahigh critical pressure conditions. CONSTITUTION:A boiler material improved in toughness after aging and steam oxidation characteristic can be obtained by the proper addition of Si and Al to a ferritic heat resistant steel excellent in high temp. strength, in which the additive quantities of Mo and W are properly regulated and Co and B are actively used. This boiler material has a chemical composition containing 0.21-0.50% Si, 0.002-0.050% Al, 0.02-

7. 发明专利

JPH068732A STEEL PIPE FOR AUTOMOBILE DOOR REINFORCING MATERIAL 失效
公开(公告)号：JPH068732A
公开(公告)日：1994-01-18
申请号：JP8913692
申请日：1992-04-09
申请人： NIPPON STEEL CORP
发明人： MIZUMURA MASAAKI , MIMURA HIROYUKI , NAOI HISASHI
IPC分类号： B60J5/00 , B60J5/04 , C21D9/08
摘要： PURPOSE:To provide a door impact bar which has excellent strength and tenacity by providing an inner surface on which no quenching is applied and an outer surface on which quenching is applied. CONSTITUTION:In a steel pipe for an automobile door reinforcing material, no quenching is applied on the inner surface 1 of the steel pipe, which has characteristics, such as high tenacity, and by applying quenching on the outer surface 2 thereof, a strength is increased. As a result, when an impact bending load is applied on the steel pipe for an automobile door reinforcing material, even in case the outer surface 2 is broken, the inner surface 1 is prevented from breakage and complete rupture is prevented from occurring. Thus, in a collision accident from the side of an automobile, safety of a passenger in a vehicle can be ensured and the steel pipe for a door impact bar (an automobile door reinforcing material) having excellent strength and tenacity can be provided.

8. 发明专利

JPH04371552A HIGH STRENGTH FERRITIC HEAT RESISTING STEEL 失效
公开(公告)号：JPH04371552A
公开(公告)日：1992-12-24
申请号：JP14634691
申请日：1991-06-18
申请人： NIPPON STEEL CORP
发明人： RIYUU KOUYOU , NAOI HISASHI , MIMURA HIROYUKI , FUJITA TOSHIO
IPC分类号： C22C38/00 , C22C38/52 , C22C38/54
摘要： PURPOSE:To produce a ferritic heat resisting steel having high strength and high toughness by preparing a steel having a specific composition in which respective contents of Mo, W, Co, and B are specified. CONSTITUTION:A steel having a composition consisting of, by weight, 0.05-

9. 发明专利

JPH01254834A INSPECTION METHOD FOR DOUBLE TUBE 失效
公开(公告)号：JPH01254834A
公开(公告)日：1989-10-11
申请号：JP8355288
申请日：1988-04-05
申请人： NIPPON STEEL CORP
发明人： TAKADA NOBUHIRO , NAOI HISASHI , SUZUKI MASAYOSHI
IPC分类号： G01M3/28
摘要： PURPOSE:To easily inspect an inner tube by making the interface gap of an inner tube and outer tube vacuum, detecting the absence of the penetration defect of the inner tube and measuring the degree of the integration of the inner and outer tubes by leading a gas into the interface gap in case of no defect being detected. CONSTITUTION:The position of a water tank 7b is decided so that the water level of the pipet 7a for the volume measurement is located at an optimum position in the state of making an interface gap 1c and pipe lines 4a-4d in an atmospheric pressure by opening stop valves 3a, 3b and a relief valve 8 at the beginning. The valve 8, 3b are then closed, a vacuum pump 6 is actuated and the absence of the inner tube damage is inspected by monitoring the vacuum state of the parts of the gap 1c and pipe lines 4a, 4c by a vacuum gage 5. And when the soundness of the inner tube is confirmed, the valve 3a is closed, the pump 6 is stopped, the valve 3b is opened and when the gas of the inside of the pipe lines 4b, 4d and pipet 7a is sucked into the gap 1c in a vacuum state, the water level of the pipet 7a varies. The measurement of the gap 1c is therefore unabled by measuring this amount. The penetration defect of the inner tube can thus be easily inspected.

10. 发明专利

JPS63313616A PRODUCTION OF HIGH FREQUENCY BENT PIPE 失效
公开(公告)号：JPS63313616A
公开(公告)日：1988-12-21
申请号：JP15096887
申请日：1987-06-17
申请人： NIPPON STEEL CORP , DAI ICHI HIGH FREQUENCY CO LTD , JGC CORP
发明人： MARUYAMA TADAKATSU , NAOI HISASHI , MATSUBARA YOICHI , TAKAGISHI MASAAKI , AKISAWA SEIICHI
IPC分类号： B21D7/16 , C21D8/10
摘要： PURPOSE:To reduce piping cost by heating and bending a base steel pipe in high frequency wave at a specific temperature zone and immediately thereafter cooling the outer surface temperature of the steel pipe by water from a fixed upper limit to a specific lower limit of temperature. CONSTITUTION:The point of the base steel pipe 1 is tightened to a clamp 5 and heated by a heater 3 at a temperature area from ( deg.C). Therefore, since in bending a steel pipe to a small radius, a bending of a fixed shape and dimension is carried out preventing buckling from occurring, elbowless piping can be conducted. Accordingly it is possible to drastically reduce welding operation and cut down piping expenditure.

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