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Matches 351 - 400 out of 2,083

Document Document Title
JP2004098101A
To suppress the generation of deflected thickness within the range of the specification while improving productivity at the time of manufacturing seamless steel tubes.When a solid-core round billet is heated in the heating furnace, the m...  
JP2004082196A
To provide a method of rolling a seamless bearing steel tube which has no outside surface defects and which prevents the generation of fine wrinkles equivalent to surface wrinkle defects on the outer surface of the bearing steel tube.In ...  
JP2004082174A
To provide a method for stably manufacturing the seamless steel tube made of high-alloy steel without performing heavy investment of equipment in the manufacturing line of the seamless steel tube constituting of an inclined piercing mill...  
JP2004082147A
To provide a rolling method for preventing an empty furnace by changing the temperature of a heating furnace when piercing bearing steel with a piercer.By slowing down the rolling speed by 25-40% in one section of the temperature zone of...  
JP2004074216A
To provide a method for manufacturing a seamless steel tube in Assel mill rolling, wherein shape defects and burst defects are reduced by finely adjusting the convergence amount according to a kind of steel, a size, and the like.The seam...  
JP2004042047A
To provide a manufacturing method of a seamless tube by piercing and rolling with a piercer in the of Mannesmann process in which the propulsive force is applied to a billet to prevent slippage by adjusting the angle between the billet a...  
JP2004042138A
To provide a method and a device by which the three-dimensional variation of the eccentricity of a hollow block along the ordinate of the hollow block is detected and especially the degree of the eccentricity which is actually properly u...  
JP2004043935A
To provide a martensitic stainless steel seamless steel tube in which the delayed fracture of the part to be subjected to impact working is hard to occur, and which has no internal defects, and to provide a method of producing the same.T...  
JP2004037460A
To provide a method and a device for indicating the actually useful degree of the eccentricity by detecting the three dimensional eccentricity of a hollow block along the vertical coordinates of the hollow block at the entrance of a roll...  
JP3503552B2
To provide a manufacturing method of a seamless tube to effectively suppress generation of flaws on an inner surface without generating any defective bite in the Mannesmann pushing and boring method using a material such as free-cutting ...  
JP3503559B2
To provide a piercing method using inclined rolls by which the generation of the pieces of a broken tube at the bottom tube-end after rolling is perfectly prevented. Piercing is performed by providing a small hole in the middle part of t...  
JP3494131B2
To efficiently manufacture a seamless steel pipe whose finishing dimension is secured thanks to the continuously manufacturing line since deflected wall thickness in the circumferential direction is less and the thickness in the end of t...  
JP2003533592A  
JP3470686B2
To provide a method for rolling seamless steel tubes by which a thin tube can be manufactured in the mandrel mill system by solving a perforation problem in the mandrel mill rolling, specifically, for example, to provide a method for rol...  
JP3460608B2
To economically produce a seamless steel tube while suppressing an inner face flaw in piercing by specifying the diameter of a billet containing a specified ratio of Cr and conducting Mannesman piercing at least at a specified temp. and ...  
JP3458485B2
PURPOSE: To provide a manufacturing method of a seamless steel pipe of excellent performance at high productivity with inexpensive equipment and manufacturing equipment train therefor. CONSTITUTION: A round billet is directly manufacture...  
JP3452039B2
To provide a method for rolling seamless steel tubes by which a thin tube can be manufactured in the mandrel mill system by solving a perforation problem in the mandrel mill rolling, specifically, for example, to provide the method for r...  
JP2003181506A
To provide a rolling method for an Assel mill which prevents cracked flaws generated in a wall thickness cross section of a steel pipe.In Assel mill rolling to prevent internal flaws generated in the thick wall cross section of the steel...  
JP3444262B2
To solve such a problem that the out-of-roundness of a steel tube is degraded when unfilling that noncontact part with a grooved roll in the stand before the final one is produced in a part of the outside surface of the steel tube at siz...  
JP2003136111A
To improve deflection generated from fluctuations of piercing efficiency.The method for rolling and controlling a seamless steel tube is characterized in that rolling is performed by controlling switching of a bar steadier provided at th...  
JP2003136131A
To provide a method for manufacturing a hollow member provided with a solid-core portion in an end side capable of manufacturing the hollow member with a good yield and a less deflected thickness.An inner face regulating tool 2 is insert...  
JP3425718B2
To provide a manufacturing method of a seamless tube to effectively suppress generation of flaws on an inner surface without generating any defective bite in the Mannesmann pushing and boring method using a material such as free-cutting ...  
JP2003112208A
To provide a device and method for rolling a steel tube which are excellent in not only tube polishing but also tube expanding capability without slowing down rolling speed than that in the conventional manner.In the rolling device for t...  
JP3411704B2
PURPOSE: To change a plug at the stage when the life of the plug is expired without monitoring the damaged state by measuring the surface temp. at the tip of the plug after rolling and before cooling and changing the plug at the point of...  
JP3407704B2
To prevent a generation of defects on the inside surface without lowering productivity even when a seamless steel tube consisting of high carbon steel is manufactured. This method is provided for manufacturing the high carbon steel seaml...  
JP3405265B2
To secure workability and to prevent the generation of internal flaws at the time of executing Mannesmann piercing of high carbon steel. A billet which is made by continuously casting the high-carbon steel containing, by weight, 0.60 to ...  
JP3402988B2
To suppress incorrect follow-up of a cam follower with respect to a tubular cam while enhancing durability through a simple structure by constructing means for urging one cam follower toward the tubular cam side of a leaf spring. Under a...  
JP3402175B2
To enlarge the possible manufactural length of a seamless steel tube. In the boring method of the seamless steel tube by an inclined roll, a boring plug 2 is arranged so that the maximum diameter part 2a is positioned in a gorge part 1b ...  
JP3402268B2
To perform a stable pierce rolling by adjusting a disc roll slanting angle in a way that an outer diameter of a hollow pipe coincides with a target value while installing a disc roll slantable against a pass line and movable in a pass li...  
JP2003053403A
To suppress external flaws occurring from the difference in level of a base stock as a starting point even in the case a seamless tube is manufactured by using a hard-to-work material the chromium content of which is ≥4.5 mass%. In the...  
JP3401434B2
To prevent the inner face of a tube to be rolled from generating a crack by making a Q value and T. Red a specific value so that tensile stress generated at a Pilger rolling time is crossed to metal fibers by using a base tube is which t...  
JP3400272B2
To prevent generation of defects such as crack in the end part of a tube stock and the like due to δ ferrite at the time of piercing rolling of cast billet for seamless tube with a piercer by rolling billet under satisfying specified co...  
JP3367746B2  
JP3369241B2  
JP3369320B2  
JP3369297B2  
JP3367332B2  
JP3361375B2  
JP2003001305A
To provide a production method for a seamless steel pipe which controls Mannesmann destruction and circumferential shearing strain and produces a product having less inner roll marks with a high productivity.A plug as shown in Fig. 3 is ...  
JP2002361384A
To provide a manufacturing method for a seamless steel pipe excellent in an inner surface and inner quality property. A round billet, which is formed into a round billet by hot rolling a slab made by continuous casting, and whose segrega...  
JP2002361304A
To provide a method for manufacturing a seamless steel tube using a round billet capable of suppressing inner face flaws that occur at the time of piercing a RCC stock with a skew rolling. 1. The round billet as continuously cast, especi...  
JP2002339038A
To produce low-alloyed high strength steel for a seamless tube for oil well or gas well, which has excellent fracture strength and sulfide stress corrosion cracking resistance in a mild acidic environment, and satisfies the yield strengt...  
JP3348664B2  
JP2002331301A
To provide an inclined drilling rolling method capable of manufacturing a seamless steel tube having less deflective wall thickness and no internal flaw at high rolling efficiency.In the inclined drilling rolling method using two or more...  
JP2002327234A
To provide a round billet for a seamless steel tube which can be drilled in a continuously as-cast state, and a drilled seamless steel tube thereof.The round billet for the seamless steel tube includes, by mass%, 0.05-0.55% C, 0.1-0.4% S...  
JP2002537486A  
JP2002316201A
To provide a planetary skew rolling method by which its various problems are eliminated by at least partially preventing temperature rising to the recrystallization temperature when performing deformation process.In the method for manufa...  
JP2002301504A
To provide a manufacturing method of a seamless metallic tube by which the defective biting of a billet in a piercer is suppressed.When a mill scale material is used as a round billet, the major axis (a) and the minor axis (b) in a regio...  
JP2002282908A
To achieve an improvement in the uniformity of pipe wall thickness in a piercer mill to be utilized in the first process for manufacturing a seamless steel pipe.A piercer mill guide comprises a guide shoe provided with an opening for mak...  
JP2002282907A
To achieve an improvement in the uniformity of pipe wall thickness in a piercer mill to be utilized in the first process for manufacturing a seamless steel pipe.A piercer mill guide is configured and that a guiding unit, comprising a gui...  

Matches 351 - 400 out of 2,083