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1. 发明专利

JPS6340014A FOUNDATION PILE FOR RELIEVING NEGATIVE FRICTIONAL FORCE 失效
公开(公告)号：JPS6340014A
公开(公告)日：1988-02-20
申请号：JP18231186
申请日：1986-08-01
申请人： DAI ICHI KOGYO SEIYAKU CO LTD , NIPPON STEEL CORP
发明人： SANO TAKASHI , SAKAMOTO TOSHIHARU , YAMAMOTO KAZUO , YAMADA KATSUHARU , UENO TAKAO , KANOU TAKANOBU , ISHIBASHI TAKAO
IPC分类号： E02D5/60 , E02D31/00
摘要： PURPOSE:To enhance the slippery performance of a foundation pile by covering the pile with polyurethane resin prepared from a polyol with two or more hydroxyl groups and a polyisocyanate with two or more isocyanate groups, having a given water absorbability and a given cross-link density, as a protective layer. CONSTITUTION:A slip layer 2 of a visco-elastic substance is formed on the periphery of a pile, e.g., steel tubular pile 1, etc., as a foundation pile. The surface of the pile 1 is further covered with polyurethane resin prepared from a polyol with two or more hydroxyl groups and a polyisocyanate with two or more isocyanate groups as a protective layer 3. The polyurethane resin has a water absorbability of 0.5% or less and a cross-link density CD of 0.7% or more, as represented by the formula CD=[W1X(F1-2)/MW1+W2X(F2-2)/ MW2]X1,000/(W1+W2), where W1 and W2 are each weights of polyol and polyisocyanate, F1 and F2 are each number of functional groups, and MW1 and MW2 are each molecular weights of polyol and polyisocyanate. The deformation of the protective layer and the irregularity of covering layer can be prevented.

2. 发明专利

JPS6340013A FOUNDATION PILE FOR RELIEVING NEGATIVE FRICTIONAL FORCE 失效
公开(公告)号：JPS6340013A
公开(公告)日：1988-02-20
申请号：JP18231086
申请日：1986-08-01
申请人： DAI ICHI KOGYO SEIYAKU CO LTD , NIPPON STEEL CORP
发明人： SANO TAKASHI , SAKAMOTO TOSHIHARU , YAMAMOTO KAZUO , YAMADA KATSUHARU , UENO TAKAO , KANOU TAKANOBU , ISHIBASHI TAKAO
IPC分类号： E02D5/60 , E02D31/00
摘要： PURPOSE:To relieve negative frictional force of a foundation pile by a method wherein a slip layer of a visco-elastic substance is formed on the periphery of a pile, and a woven fabric covering material, e.g., Vinylon cloth, etc., impregnated with polyurethane resin is covered on the surface of the pile. CONSTITUTION:A slip layer 2 of a visco-elastic substance is formed on the periphery of a foundation pile 1 of steel tube, H-steel, I-steel, or concrete. A woven fabric covering material 3, e.g., Vinylon, glass, tetron, nylon, or jute cloth or mat, impregnated with polyurethane resin is spirally covered as a protective layer on the surface of the layer 2 by strongly bonding the upper layer with the lower layer of polyurethane resin of the material 3. The characteristic features at the time of production, outdoor storage, and driving-in can thus be effectively exhibited.

3. 发明专利

JPS6347417A FOUNDATION PILE FOR RELIEVING NEGATIVE FRICTIONAL FORCE 失效
公开(公告)号：JPS6347417A
公开(公告)日：1988-02-29
申请号：JP19128386
申请日：1986-08-14
申请人： DAI ICHI KOGYO SEIYAKU CO LTD , NIPPON STEEL CORP
发明人： SANO TAKASHI , SAKAMOTO TOSHIHARU , YAMAMOTO KAZUO , YAMADA KATSUHARU , KANOU TAKANOBU , UENO TAKAO , ISHIBASHI TAKAO
IPC分类号： E02D5/60 , E02D31/00
摘要： PURPOSE:To prevent the occurrence of deformation, crack, and separation of a synthetic resin covering layer by a method in which a slip layer made of a visco-elastic substance is formed on the periphery of a pile and a protective layer made of a specific substance is formed on the slip layer. CONSTITUTION:A slip layer 2 made of a visco-elastic substance is formed on the periphery of a foundation pile for relieving negative frictional force, and a protective layer 3 made of polyurethane resin containing 1-30wt% volatile substance is formed on the slip layer 2. As the volatile substance removes from the layer 3, the properties such as hardness, strength, flexibility, etc., of the layer 3 are changed. The contraction of the protective layer 3 during the hardening period can be lessened, and the slip layer of the shaped foundation pile can be effectively protected.

4. 发明专利

JPS6340015A FOUNDATION PILE FOR RELIEVING NEGATIVE FRICTIONAL FORCE 失效
公开(公告)号：JPS6340015A
公开(公告)日：1988-02-20
申请号：JP18231286
申请日：1986-08-01
申请人： DAI ICHI KOGYO SEIYAKU CO LTD , NIPPON STEEL CORP
发明人： SANO TAKASHI , SAKAMOTO TOSHIHARU , YAMAMOTO KAZUO , YAMADA KATSUHARU , UENO TAKAO , KANOU TAKANOBU , ISHIBASHI TAKAO
IPC分类号： E02D5/60 , E02D31/00
摘要： PURPOSE:To raise the slippery function of a foundation pile by forming a protective layer of polyurethane resin containing an inorganic filler having a given linear expansion coefficient on the outside of a slip layer of visco-elastic substance on a pile. CONSTITUTION:A slip layer 2 of a visco-elastic substance is formed on the periphery of a foundation pile 1, e.g., steel tubular pile, H-steel pile, etc., for relieving negative frictional forces, which is to be used is soft ground. A protective layer 3 of polyurethane resin prepared from reaction of a compound with two or ore hydroxyl groups and a compound with two or more isocyanate groups, containing 5-200wt% an inorganic filler having a linear expansion coefficient of 0.1X10 / deg.C or less, is formed on the surface of the layer 2. The occurrence of deformation, cracking, delamination, and blistering, etc., of the protective layer 3 can thus be prevented.

5. 发明专利

JP2001262275A HIGH TENSILE STRENGTH SEAMLESS STEEL PIPE EXCELLENT IN TOUGHNESS, DUCTILITY AND WELDABILITY AND ITS PRODUCING METHOD 失效
公开(公告)号：JP2001262275A
公开(公告)日：2001-09-26
申请号：JP2000080803
申请日：2000-03-22
申请人： NIPPON STEEL CORP
发明人： SAKAMOTO TOSHIHARU
IPC分类号： C21D8/10 , C21D9/08 , C22C38/00 , C22C38/12 , C22C38/50
摘要： PROBLEM TO BE SOLVED: To provide a seamless steel pipe having high tensile strength and excellent also in toughness, ductility and weldability. SOLUTION: This high tensile strength steel pipe excellent in toughness, ductility and weldability has a composition comprising by mass, 0.10 to 0.40% C, 0.01 to 0.03% M and, if required, Cu, Cr, Mo, Ti, Nb, or the like, and the balance Fe with inevitable impurities, in which Ceq defined by the following formula satisfies the condition of 0.40 to 0.55 and has tensile strength of >=590 MPa, Charpy absorbed energy at -20 deg.C of >=30 J and elongation of >=20%.

6. 发明专利

JP2000313919A MANUFACTURE OF HIGH STRENGTH STEEL PRODUCT FOR OIL WELL USE, EXCELLENT IN SULFIDE CRACKING RESISTANCE 失效
公开(公告)号：JP2000313919A
公开(公告)日：2000-11-14
申请号：JP12306799
申请日：1999-04-28
申请人： NIPPON STEEL CORP
发明人： SAKAMOTO TOSHIHARU , ASAHI HITOSHI
IPC分类号： B21B3/00 , C21D8/10 , C22C38/00 , C22C38/14 , C22C38/32
摘要： PROBLEM TO BE SOLVED: To manufacture the steel product with high energy efficiency by subjecting a steel stock which has a specific composition containing C, Si, Mn, P, S, Mo, Al, Ti, Nb, N, and B and in which yield strength and Mo content satisfy a specific relation to hot working, hardening treatment, and tempering under respectively specified conditions. SOLUTION: The steel stock contains, by weight, 0.10-0.25% C, =-18.8 (where YS is yield strength shown by ksi). The steel stock is heated to >=1,150 deg.C and hot worked. Finish working is completed at a temperature not lower than (Ar3 point +50 deg.C). Quenching is done without delay to perform hardening, and a metallic structure in which as-hardened hardness in the position at the longest distance from the cooling surface becomes >=95% of surface hardness is formed, followed by tempering at 660 to 720 deg.C.

7. 发明专利

JPH11342419A CLAD STEEL PIPE MANUFACTURE BY PRESS ROLL PIERCING MACHINE 失效
公开(公告)号：JPH11342419A
公开(公告)日：1999-12-14
申请号：JP14733498
申请日：1998-05-28
申请人： NIPPON STEEL CORP
发明人： YAMAMOTO SHUJI , SAKAMOTO TOSHIHARU , MARUYAMA KAZUSHI
IPC分类号： B21B17/00 , B21C37/06
摘要： PROBLEM TO BE SOLVED: To obtain a clad steel pipe having a good inner surface status by rolling the pipe while supplying a lubricating agent to an inside of a working side inner pipe in a rolling mill, when the clad steel pipe is rolled by a press rolling piercing machine. SOLUTION: In case of a rolling by the press roll piercing machine, a rolling member 2 to be rolled wholly contacts with a plug 3 in a circumferential direction and no clearance is generated. Even when the lubricating agent is not applied in advance to whole of the inner face of the rolling member, the lubricating agent is supplemented between the plug 3 and the rolling member 2 by inserting the lubricating agent in an inside of a working side inner pipe in the rolling mill so that the lubrication is made possible across the whole length of the rolling member 2. That is after the inner pipe is inserted into a penetrating hole across the whole length of a rectangular cross-section steel piece, the clad steel pipe is manufactured by rolling a billet, which joined a boundary part between an end face of the working side steel piece in the rolling mill and the inner pipe, by the press roll piercing machine. In that case, the lubricating agent is supplied to the inside of the bite-in side inner pipe in the rolling mill. A lubricating agent containing an iron oxide of Fe2 O3 and the like as a main element and a glass at 15 wt.% is used.

8. 发明专利

JPH11293404A SEAMLESS STEEL PIPE EXCELLENT IN FIRE RESISTANCE AND ITS PRODUCTION 失效
公开(公告)号：JPH11293404A
公开(公告)日：1999-10-26
申请号：JP30006598
申请日：1998-10-21
申请人： NIPPON STEEL CORP
发明人： SAKAMOTO TOSHIHARU , MARUYAMA KAZUSHI , UCHINO KOICHI , MORI KEIICHIRO , TAMURA SHINICHI
IPC分类号： C21D8/10 , C22C38/00 , C22C38/12 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To produce a thick seamless steel pipe, particularly of >=30 mm thickness having characteristics of >=217 MPa yield stress at 600 deg.C and >=490 MPa tensile strength at normal temperature and excellent in fire resistance and to provide a method for producing the above seamless steel pipe by a hot rolling method of a Mnnesman system. SOLUTION: This seamless steel pipe excellent in fire resistance is the one having a compsn. contg., by weight, 0.05 to 0.18% C, = two kinds among 0.2 to 1.0% Ni, 0.1 to 0.5% Cu, 0.1 to 0.5% Cr, 0.0005 to 0.0050% Mg and 0.005 to 0.050% Ca, and the balance Fe with inevitable impurities and having >=30 mm thickness at need.

9. 发明专利

JPH10221238A MATERIAL SELECTING METHOD AND MATERIAL SELECTING DEVICE FOR OIL WELL PIPE TUBING 失效
公开(公告)号：JPH10221238A
公开(公告)日：1998-08-21
申请号：JP3305097
申请日：1997-01-31
申请人： NIPPON STEEL CORP , SEKYU KODAN
发明人： SAKAMOTO TOSHIHARU , MARUYAMA KAZUSHI
IPC分类号： G01N17/02 , F16L15/04 , G01N27/26
摘要： PROBLEM TO BE SOLVED: To efficiently select the optimum material combination in cost and corrosion resistance by determining the corrosion performance of the allocated candidate material for each segment based on the given material conditions and corrosive environmental conditions. SOLUTION: An oil well pipe 600 is provided with a cylindrical casing 601 directly receiving the pressure of the ground, a tubing 602 inside it, and a packer 604 for holding a finish fluid 603 filled between them. The lower end section of the tubing 602 is arranged in an oil/gas layer 605, and petroleum or natural gas can be collected from the upper end section of the tubing 602. The corrosion performance of a candidate material allocated to each of segments S1-S5 is determined based on the given material conditions and corrosive environmental conditions, the candidate material corresponding to different environmental conditions for each segment can be easily designed, and the material having economical efficiency, design conditions, and corrosion performance capable of withstanding the corrosive environment in a well can be selected.

10. 发明专利

JPH08260037A PRODUCTION OF MARTENSITIC STAINLESS STEEL EXCELLENT IN SULFIDE STRESS CRACKING RESISTANCE, TOUGHNESS, AND HOT WORKABILITY 失效
公开(公告)号：JPH08260037A
公开(公告)日：1996-10-08
申请号：JP6460095
申请日：1995-03-23
申请人： NIPPON STEEL CORP
发明人： KAWAKAMI SATORU , SAKAMOTO TOSHIHARU , ASAHI HITOSHI
IPC分类号： C21D6/00 , C22C38/00 , C22C38/40 , C22C38/50
摘要： PURPOSE: To produce a martensitic stainless steel excellent in hot workability, sulfide stress cracking resistance, and toughness. CONSTITUTION: A steel, which has a composition consisting of, by weight, 0.1-0.3% C, 0.01-1.0% Si, 0.1-1.0% Mn, =-10.86, is used. This steel is hot-worked, cooled down to room temp., heated to 880-1050 deg.C, cooled down to a cooling stoppage temp. of 600-350 deg.C at a rate of >=2 deg.C/sec, air-cooled to room temp., and tempered at a temp. not higher than Ac1 . By this method, the steel, superior to the conventional steel in toughness and sulfide stress cracking resistance in a state of the chemical composition of the conventional steel such as AISI420, can be obtained.

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