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JP2004314172 |
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...
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JP2004306037 |
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...
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JP2004285433 |
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...
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JP2004255427 |
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...
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JP2004250729 |
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 ...
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JP2004238662 |
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...
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JP2004223592 |
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...
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JP3580197 |
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...
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JP2004211115 |
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...
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JP3578052 |
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 ...
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JP2004195468 |
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...
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JP2004122137 |
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...
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JP2004098101 |
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...
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JP2004082174 |
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...
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JP2004082147 |
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...
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JP2004082196 |
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 ...
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JP2004074216 |
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...
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JP2004043935 |
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...
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JP2004042047 |
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...
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JP2004042138 |
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...
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JP2004037460 |
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...
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JP3503559 |
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...
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JP3503552 |
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 ...
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JP3494131 |
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...
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JP3470686 |
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...
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JP3460608 |
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 ...
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JP3458485 |
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...
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JP3452039 |
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...
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JP2003181506 |
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...
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JP3444262 |
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...
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JP2003136111 |
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...
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JP2003136131 |
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...
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JP3425718 |
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 ...
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JP2003112208 |
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...
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JP3411704 |
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...
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JP3407704 |
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...
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JP3405265 |
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 ...
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JP3402175 |
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 ...
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JP3402268 |
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...
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JP3402988 |
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...
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JP2003053403 |
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...
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JP3400272 |
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...
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JP3401434 |
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...
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JP2003001305 |
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 ...
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JP2002361304 |
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...
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JP2002361384 |
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...
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JP2002339038 |
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...
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JP2002331301 |
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...
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JP2002327234 |
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...
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JP2002316201 |
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...
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