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Patent Searching and Data


Matches 301 - 350 out of 2,059

Document Document Title
JP2005211912A
To provide a method for preventing any uneven thickness of a seamless steel tube.In the uneven thickness preventive method of a seamless steel tube, the amplitude of a mandrel during the drilling is measured in a seamless steel tube manu...  
JP2005202803A
To provide a learning control method capable of preventing learning accuracy from deteriorating if errors are greatly changed by factors that change over time or if learning has not been fully achieved as manufacturing conditions vary gr...  
JP3692597B2
To reduce the defective ratio of a hollow stock tube and to improve the yield by predicting the fusing damage of the tip part of a plug based on the measured result of a measuring means of a billet progressing velocity and a measuring me...  
JP2005163167A
To provide a rotary hearth equipment in a seamless steel tube manufacturing line, and a seamless steel tube manufacturing method using the same.In the rotary hearth equipment in the seamless steel tube manufacturing line, a billet is lif...  
JP2005131688A
To provide a manufacturing method of seamless steel tube for a boiler and its piping, which does not cause a rolling defect on a product, even when a Mannesmann type skew rolling process is adopted.A material consisting of C:≤0.15 mass...  
JP2005111518A
To provide a method for manufacturing a seamless tube with a three-roll mandrel mill by which defective pulling-out of a mandrel bar after rolling and occurrence of scratches with the mandrel bar inside tubing are effectively suppressed ...  
JP2005105379A
To provide a method for inexpensively manufacturing a seamless steel pipe superior in grain size properties and cold workability, without deteriorating quality through decarbonization or the like.A material of the steel pipe comprises, b...  
JP2005068490A
To provide a solid round billet having favorable biting property and anti-slipping property for a tilted roll type piercer, to provide its manufacturing method, and to provide an efficient method for manufacturing a martensite stainless ...  
JP2005046893A
To provide a method for suppressing deviation in the wall-thickness of a seamless steel tube which can produce a seamless steel tube having a more even, that is, less deviated wall-thickness in a tubular circumferential direction than a ...  
JP3646417B2
To reduce the producing cost of a seamless steel tube containing Cr by using saddle type roll having a prescribed angle range of an opening angle at the caliber bottom in one pair of rolls. Rolling reduction is applied to a cast billet 1...  
JP2005014032A
To provide a method for manufacturing a seamless stainless steel tube made of two-phase stainless steel excellent in the quality of the inside surface by using Mannesmann tube making process including stretch reduction.The method is prov...  
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...  

Matches 301 - 350 out of 2,059