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71. 发明专利

JPS5884958A MANUFACTURE OF KILLED STEEL SLAB FOR HOT ROLLING 失效
公开(公告)号：JPS5884958A
公开(公告)日：1983-05-21
申请号：JP18094281
申请日：1981-11-13
申请人： NIPPON STEEL CORP
发明人： IWASAKI YOSHIJI , SEKI HIROSHI , NAKASUGI HAJIME
IPC分类号： C22C38/00 , B22D11/00 , C22C38/14
摘要： PURPOSE:To prevent the surface of Nb steel or Nb-V steel provided with high strength and toughness from being cracked during hot rolling by adding a specified amount of Ti to the steel. CONSTITUTION:The Nb, V, Ti and V contents of Nb steel or Nb-V steel contg. =2 kinds of elements selected from Mo, Ni, Cu, Ca, Cr, W, Zn, REM and Hf as the steel of a steel plate for a pipeline, a thick steel plate, a steel bar, etc. requiring high strength and toughness as rolled or after treatment under heating are adjusted so as to satisfy 0.05 =0.006. Thus, the surface of a slab of the steel can be prevented from being cracked during hot rolling.

72. 发明专利

JPS5814848B2 失效
公开(公告)号：JPS5814848B2
公开(公告)日：1983-03-22
申请号：JP3823479
申请日：1979-03-30
申请人： NIPPON STEEL CORP
发明人： MATSUDA HIROO , TAMEHIRO HIROSHI , OOHASHI MAMORU , NAKASUGI HAJIME
IPC分类号： C22C38/00 , C21D8/02

73. 发明专利

JPS54132421A MANUFACTURE OF HIGH TOUGHNESS BAINITE HIGH TENSILE STEEL PLATE WITH SUPERIOR WELDABILITY 失效
公开(公告)号：JPS54132421A
公开(公告)日：1979-10-15
申请号：JP4009278
申请日：1978-04-05
申请人： NIPPON STEEL CORP
发明人： NAKASUGI HAJIME , IMAGUNBAI MASAKATA , TAMEHIRO HIROSHI
IPC分类号： C22C38/00 , C21D8/02 , C21D9/52 , C22C38/04
摘要： PURPOSE:To manufacture a bainite high tensile steel plate with superior weldability and low temp. thoughness by rolling a B and Ti-added steel of extremely low carbon equivalent under specific conditions. CONSTITUTION:A steel ingot is heated to below 1150 deg.C and rolled at a total reduction ratio at below 900 deg.C above 50% and a finish temp. of 700-800 deg.C. The steel contains C; 0.005-0.03%, Si

74. 发明专利

JPS54107411A TEMPERING OF LARGE DIAMETER STEEL TUBE 失效
公开(公告)号：JPS54107411A
公开(公告)日：1979-08-23
申请号：JP1356978
申请日：1978-02-10
申请人： NIPPON STEEL CORP
发明人： NAKASUGI HAJIME , KIMURA TSUTOMU , YAMAGUCHI MASANOBU
IPC分类号： C21D9/08
摘要： PURPOSE:To reduce installation cost and also to raise productivity by making proper stress alleviation in a short time by controlling temperature and time patterns in the tempering of large diameter steel tube. CONSTITUTION:In the tempering of a large diameter steel tube, e.g., UO steel pipe, a cooling time from the tempering temperature to 300 deg.C is set to more than 60 sec, and then the cooling time from 300 deg.C to water temperature is made faster by water cooling. If the cooling time down to 300 deg.C is set to more than 60 sec, as shown in the Fig. [where (1), Code (2) Tempering temperature, (3) Measuring position, (4) Inside surface, (5) Outside surface, (6) Water hardening is made from 930 deg.C before tempering, (7) Cooling time(sec), (8) Tensile, (9) Residual stress, (10) Compressive], the residual stress can be practically suppressed to allowable 10 kg/mm or leee. In short, treatment can be performed withing less than 1/3 of the time required for the conventional air cooling method by the procedure in which air cooling is made down to 300 deg.C and then below the temperature, water cooling is made. Thus, productivity can be greatly raised as compared with the conventional method requiring wider space and larger facilities.

75. 发明专利

JPS54100965A MANUFACTURE OF WELDED LARGE DIAMETER STEEL TUBE FOR HEAT TREATMENT 失效
公开(公告)号：JPS54100965A
公开(公告)日：1979-08-09
申请号：JP732278
申请日：1978-01-27
申请人： NIPPON STEEL CORP
发明人： NAKASUGI HAJIME , KIMURA TSUTOMU , YAMAGUCHI MASANOBU
IPC分类号： B23K31/00
摘要： PURPOSE:To obtain high srength and high toughness as well as reduce difference in hardness between inner face and outer face by selcting a higher quenchability (D1 value) of welding metal for inner side than the welding metal for outer side. CONSTITUTION:For large diameter steel of a round section, the value of quenchability (D1 value) for the welding metal of the inner side which is higher than that of the welding metal of the outer side varies with the thickness, etc. of base metal used to a great extent, and therefore is not limiting. And, where the thickness of plate is greater, it is more effective to make D1 value difference between the outer and inner faces greater, whereas where it is thinner, it is better to make it samller. Although quenching from the outer side is described in this invention, the same is true of the case of cooling the inner and outer faces. In short, since the inner face cooling is to cool the inner side of closed structures as compared with the case of the outer face cooling, cooling ability tends to lower in general due to the waste water, etc. of quenching water, and thus the lowering of cooling ability can be compensated by increasing the quenchability.

76. 发明专利

JPS5485108A CONTROLLING METHOD FOR POSITION OF COOLING NOZZLE 失效
公开(公告)号：JPS5485108A
公开(公告)日：1979-07-06
申请号：JP15298377
申请日：1977-12-21
申请人： NIPPON STEEL CORP
发明人： NAKASUGI HAJIME , KIMURA TSUTOMU , YAMAGUCHI MASANOBU
IPC分类号： C21D1/00
摘要： PURPOSE:To secure uniform cooling and to produce heat-treated pipe of excellent quality, by detecting the position of four or more points on the circle at which the cooling of steel pipe starts by means of industrial televisions, and by controlling the position of cooling nozzles in order to make the circle cross the pass line at right angles. CONSTITUTION:At four points on a circle where the cooling of steel pipe 22 starts are arranged industrial televisions (ITV) 23 at an interval of 90 deg.. When hardening is normal, i.e., cooling-start line 3 crosses the pass line at right angles, the cooling- start line is regulated so as to be located at the center of each ITV 23. In such situation, the hardening of the steel pipe 22 is monitored. When cooling becomes abnormal, i.e., cooling-start line 3 inclines to the pass line, red-hot part decreases at the upper ITV 23 position and increases at the lower ITV 23 position. The nonconcentric state in arrangement of the steel pipe 22 and cooling nozzles 1--- is indicated as a relative slippage of cooling-start line and is distinguished easily.

77. 发明专利

JPS53147614A RECEPROCATING NEAT TREATING APPARATUS FOR LARGE DIAMETER STEEL PIPE 失效
公开(公告)号：JPS53147614A
公开(公告)日：1978-12-22
申请号：JP6223677
申请日：1977-05-30
申请人： NIPPON STEEL CORP
发明人： NAKASUGI HAJIME , YAMAGUCHI MASANOBU
IPC分类号： C21D9/08 , C21D1/00
摘要： PURPOSE:To improve the amount of production through even heat treatment of both inner and outer surface of the steel pipe by means of outer surface cooling devices arranged on the both sides of a induction heating device as opposed to each other with an inner surface cooling device provided in one of the outer surface cooling devices.

78. 发明专利

JPS53146917A MANUFACTURE OF SMALL SEPARATION* LOW YIELD RATIO* HIGH TENSILE STEEL SHEET 失效
公开(公告)号：JPS53146917A
公开(公告)日：1978-12-21
申请号：JP6183077
申请日：1977-05-27
申请人： NIPPON STEEL CORP
发明人： NAKASUGI HAJIME , MASUI HIROAKI , KUSUMOTO TAKATOSHI , TAMEHIRO HIROSHI , SHIMOMURA SHINICHI
IPC分类号： C22C38/00 , C21D8/02 , C22C38/12 , C22C38/28 , C22C38/50 , C22C38/58
摘要： PURPOSE:To manufacture the title sheet by hot rolling steel of a specified compsn. contg. C, Si, Mn, S, Al, one or more out of Nb, V and Ti, and Cr and/or Mo in two stages at a specified total reduction ratio relative to the thickness of the end product.

79. 发明专利

JPS5354118A PRODUCTION OF HIGH TENSILE STEEL SHEET WITH EXCELLENT BRITTLENESS CRACKPROPAGATION STOPPING PROPERTIES 失效
公开(公告)号：JPS5354118A
公开(公告)日：1978-05-17
申请号：JP12981276
申请日：1976-10-28
申请人： NIPPON STEEL CORP
发明人： NAKASUGI HAJIME , MASUI HIROAKI
IPC分类号： C22C38/00 , C21D6/00 , C21D8/02 , C21D9/52 , C22C38/58
摘要： PURPOSE:To produce a high tensile steel sheet with excellent brittleness crack propagation resistance without adding expensive alloy elements by producing steel contg. C and Mn by a combination of hot rolling, low temp. rolling, and heating.

80. 发明专利

JPS5352228A PRODUCTION OF HIGH TENSILE HIGH TOUGHNESS STEEL 失效
公开(公告)号：JPS5352228A
公开(公告)日：1978-05-12
申请号：JP12808076
申请日：1976-10-25
申请人： NIPPON STEEL CORP
发明人： NAKASUGI HAJIME , MASUI HIROAKI , TAMEHIRO HIROSHI , ISODA SEIJI
IPC分类号： C22C38/00 , C21D1/28 , C21D6/00 , C21D8/02 , C21D9/52 , C22C38/14
摘要： PURPOSE:To produce a high tensile steel sheet with excellent low temp. toughness, welding crack sensibility resistance, hydrogen-induced cracking sensibility resistance, and through thickness reduction of area by hot rolling a steel slab of a specified compsn. contg. C, Si, Mn, S, Al, and Ti under specified conditions followed by cooling at a specified rate.

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