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Patent Searching and Data


Matches 451 - 500 out of 2,078

Document Document Title
JP2001205323A
To develope a rolling method with which not only stripping property is improved but the quality of rolling with a sizing mill or a extractor mill is improved. In a rolling method with a retract mandrel mill, a shell outside diameter mete...  
JP3214379B2
To eliminate the defect of internal quality of a cast billet, to improve the production efficiency of a seamless steel pipe and to reduce the production cost by continuously casting a steel containing a prescribed wt.% or higher of Cr wi...  
JP3214377B2
To provide a producing method for a round cast billet which eliminates porosity and solidified structure, improves the internal quality of the cast billet and fully prevents the inner flaw at the time of pipe-making. The producing method...  
JP2001162306A
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 ...  
JP2001162307A
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 ...  
JP2001137913A
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...  
JP2001129603A
To provide a drawing and rolling method of a pipe capable of reducing the squarioh inward of a pipe so as not to enlarge crop and flaws on the surface of the pipe, and require a complicated mechanism. In the drawing and rolling method of...  
JP2001121203A
To correctly estimate and identify the causes of thickness non-uniformity, and to take an appropriate thickness non-uniformity preventive action in an early stage in manufacturing a seamless pipe. In a thickness non-uniformity monitoring...  
JP2001105012A
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...  
JP2001096304A
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...  
JP2001058207A
To provide a steel tube free from any inner surface flaws without preworking a difficult-to-work material, in particular, a stock material inferior in the inner quality of the as-cast stock material by providing a back pressure applying ...  
JP2001047101A
To provide a method and rolling equipment for manufacturing the small quantities of wires, bars and also tubes a year by an economical method. As the method, the rolling of the wires and bars is executed on one side, the rolling of seaml...  
JP2001038407A
To control diameter reduction of the rear end portion of a hollow material pipe by moving a plug in the direction opposite to the piercing rolling direction when a predetermined portion on the rear end side in the rolling direction is ro...  
JP3125692B2  
JP2001009507A
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...  
JP2001009508A
To provide a method of piercing a round cast steel which can reduce thickness nonuniformity even by using roller shoes for multiple sizes when the round cast steel is pierced with a piercer rolling mill to make it into a hollow pipe for ...  
JP2001009510A
To prolong plug life and improve productivity by cooling and lubricating a piercer or elongator plug and making the OK/NG judgment.This equipment is equipped with a plug fitting unit 70 to fit a piercing plug 1 to a plug bar 10, a transp...  
JP2000343106A
To provide a speed-changing rolling method of an Assel mill to minimize hindrance of productivity during seamless steel pipe elongator rolling.In this speed-changing method of an Assel mill, when the number of revolutions of rolls is con...  
JP2000334507A
To provide a roll slip inhibitor for hot rolling with which the improvement of biting property and prevention of choking in piercing are possible and piercing method by which stable operation is enabled and products excellent in internal...  
JP2000334505A
To suppress the cost of material by using a cast billet consisting of a hard-to-work material or an as-cast material and to prevent flaws on the inside surface of a tube even when Mannesmann piercing is executed by confining the rotation...  
JP2000334506A
To suppress the occurrence of flaws at the time of tube making when Mannesmann piercing is mainly applied to diffucult-to-work materials which is inferior in hot workability and taken as being unsuitable to the material for seamless stee...  
JP2000326002A
To allow the section shape of a seamless steel tube to be completely round and to straighten the bend thereof by using a rotary sizer whose roll shape is deformed uneven as the rotary sizer in a process for improving the roundness. The r...  
JP3129064B2
PURPOSE: To manufacture a seamless steel pipe by preventing the generation of a flaw on the inner surface of the pipe when piercing and rolling a cast billet cast continuously, using as a billet, and when piercing and rolling a cast bill...  
JP2000312907A
To provide a steel pipe with isotropic and superior ductility and collision-impact resistance characteristics without requiring a large-scale process modification by combining stretch-rolling and skew-rolling at the rolling temperature f...  
JP3127822B2
To provide a method for manufacturing the seamless steel pipe made of a high W duplex stainless steel. After heating a billet made of a duplex stainless steel, containing W of 1.5wt.% or higher and 5wt.% or lower in a temperature range i...  
JP2000301214A
To reduce rotational acceleration and to secure the accuracy of centering of a position of a piercing plug by being provided with a core bar shifter for restraining or releasing the end part of the core bar and a driving device for rotat...  
JP2000301212A
To provide a rolling method of a tube stock for seamless tubes for not generating pleat-shaped stripping/bulging defects on the inside surface of the tube stock at the time of rolling and piercing the tube stock for seamless tubes with a...  
JP2000301213A
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 ...  
JP3120927B2
PURPOSE: To provide a manufacture method of a seamless steel tube having grain refining organization. CONSTITUTION: This seamless steel tube having grain refining organization is manufactured as below. After a steel heated to a high temp...  
JP3119160B2
To prevent defective bite, the contraction of a tube end, and the occurrence of an uneven thickness, and to improve quality and productivity even when piercing rolling a thick tube with high expansion ratio and low ratio of piercing by s...  
JP2000280008A
To drill a hollow pipe whose thickness nonuniformity is suppressed by using specific values for the distance between an inclined roll center and a mandrel holding device adjacent to the inclined roll, distance between mutually adjacent m...  
JP2000280007A
To supply lubricant to guide shoe at either non-rolling time or rolling time by spraying the lubricant toward the opposed guide shoe surface at non- rolling time and supplying the lubricant between the material to be rolled and the guide...  
JP2000246354A
To build up a plastic processing tool for processing symmetrically rotate working material so as to reduce hertzian pressure. A plastic processing tool 1 has eccentrically arranged two rolling elements 2, 3 the eccentric rate e of which ...  
JP2000246311A
To make a seamless pipe out of difficult-to-process steel or steel as it is cast without increasing the cost by giving back pressure to the steel by means of a pusher to push it until it is stably taken in and controlling the pusher movi...  
JP3106824B2
PURPOSE: To attain a forming condition free from the generation of a roll mark by finding the generation limit line of the roll mark according to the ovalities of three roll stands, and limiting the ovalities of two roll stands and a dra...  
JP2000239807A
To produce a heat resistant austenitic stainless steel having sufficient structural stability as well as high strength at high temperature, excellent steam oxidation resistance, and excellent fire side corrosion resistance. This steel ha...  
JP3085149B2  
JP3085256B2  
JP2000233209A
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 ...  
JP3082419B2  
JP3082665B2  
JP3082489B2  
JP3082415B2  
JP3082678B2  
JP3082414B2  
JP3080090B1  
JP2000225403A
To provide an effective inexpensive method for preventing harmful burning to the working surface of a working tool. Relating to the two roll skew rolling type piercer provided with the working tool for rolled stocks whose plastic deforma...  
JP3067649B2  
JP2000190007A
To obtain a hollow body or pipe with specified outside diameter and wall thickness while reducing reheating time and preventing the danger of the bottom being broken through by using a mandrel with a spherical end when the hollow materia...  
JP2000190006A
To obtain a seamless steel pipe without inner surface defect by using a continuously cast billet. This invention relates to a method to drill continuously-cast billet of a seamless steel pipe material with a drilling roll having barrel t...  

Matches 451 - 500 out of 2,078