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Patent Searching and Data


Matches 301 - 350 out of 2,049

Document Document Title
JP2005014031A
To provide a method for manufacturing a seamless chromium steel tube by which the seamless high chromium steel tube is manufactured without making roll marks occur frequently even in a method for manufacturing a seamless steel tube using...  
JP2005015823A
To provide a high strength steel pipe which has excellent deformability and an excellent strength of X 80 to 100 class in the API standards and is suitable for a pipeline, and to provide its production method.In the high strength steel p...  
JP3633434B2
To prevent generation of flows on the outer surface of a martensitic stainless steel piece containing Cr: 10.0∼16.0 wt.%, Ni: 1.0∼8.0 wt.% in rolling it. A lower layer of oxide scale produced on the surface of a martensitic stainless...  
JP3606949B2  
JP3598771B2  
JP2004314172A
To improve the production efficiency and the reliability of a planetary skew rolling mill in a method for manufacturing a tube from a metallic material.An inner tool (5) is pulled back from the working position (8) by a prescribed amount...  
JP2004306037A
To provide a control method of hot sizing for finishing the outside diameter of a seamless steel tube into a complete round.The locally incomplete roundness is prevented by controlling the motor current value I and/or the number N of rev...  
JP2004285433A
To provide a method for producing a soft stainless steel seamless tube used for blank tube expanded to the diameter in cold state or in hot state for obtaining a large diameter medium C-martensite stainless steel seamless tube.To the sta...  
JP2004255427A
To prevent the outer surface quality of a product from deteriorating by preventing rolling chips seized to a grooved roll edge part from damaging the outer surface of the succeeding material to be rolled in the sizing rolling by a sinkin...  
JP2004250729A
To provide a cast roll material for rolling a seamless steel pipe, having superior slipping resistance and inhibiting occurrence of the surface damage, and to provide a roll for rolling the seamless steel pipe.The cast roll material has ...  
JP3564314B2  
JP2004238662A
To provide a martensitic stainless steel pipe superior in corrosion resistance, crushing resistance and toughness, and to provide a method for manufacturing the above steel pipe without heat-treating it.(1) The martensitic stainless stee...  
JP2004223592A
To provide a method for remachining a roll by which shortening of roll remachining time and the reduction of the cost of roll remachining tools and the cost of rolls are realized by reducing the machining allowance in the direction perpe...  
JP3580197B2
To provide a manufacturing method of seamless steel tubes which is devised so as to preliminarily reduce surplus for a small lot of materials. This is a method for manufacturing the seamless steel tubes on a manufacturing line in which a...  
JP2004211115A
To provide a method for producing a copper pipe by which a small diameter copper pipe having an outer diameter of ≤ 10 mm produced by applying a cold-working of a large reducing area ratio of ≥ 99% to an extruded blank pipe hardly ca...  
JP3578052B2
To provide a piercing rolling method of a seamless steel pipe preventing seizure on disk rolls. In piercing rolling of the seamless steel pipe by means of a rolling machine having a pair of disk rolls, the piercing rolling method of the ...  
JP2004195468A
To provide a rolling method and a rolling device by which the miniaturization of the device and the problem of noise are dissolved, not only rolling from the large diameter to the small diameter is enabled, but various rolling operations...  
JP2004122137A
To provide a manufacturing method of seamless martensitic stainless steel tube by which roll marks are not generated on products even when Mannesmann skew rolling method is adopted.When the seamless steel tube is manufactured in a mandre...  
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...  
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...  
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 ...  
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...  
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...  
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...  
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...  
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...  
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 ...  
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 ...  
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...  
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...  
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...  
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...  
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...  

Matches 301 - 350 out of 2,049