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JP2001219204A |
To manufacture a seamless steel tube of a high-load material by a line for mainly manufacturing medium/small-diameter size seamless steel tube using an inclined piercer.After piercing a billet 1 with the inclined piercer 2, a roll gap an...
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JP2001219207A |
To manufacture a large-diameter/thin-walled size seamless steel tube excellent in the accuracy of thickness.In a rolling line which is provided with a piercer 2, an inclined rolling mill 3 and a plug mill 4, by changing the conveying dir...
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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...
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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...
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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...
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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 ...
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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...
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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...
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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...
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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...
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JP3125692B2 |
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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 ...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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 ...
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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...
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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...
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JP3085149B2 |
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JP3085256B2 |
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JP3082419B2 |
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JP3082665B2 |
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JP3082489B2 |
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JP3082415B2 |
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JP3082678B2 |
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JP3082414B2 |
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JP3080090B1 |
[wrap up] [Task] Provided is a seamless pipe rolling method capable of perforating a hollow raw pipe by suppressing the occurrence of uneven thickness. The distance L of the core metal holding device is 0.8 m or more and 3.5 m or less, t...
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JP3067649B2 |
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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...
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JP3058025B2 |
PURPOSE: To provide the easy, safe and precise aligning method. CONSTITUTION: In the aligning method of rolling mill which executes measurement from the reference face of a housing 1 by use of a jig 14, while the jig 14 is placed between...
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JP2000176512A |
To improve biting property at the time of piercing a billet.In a method for piercing the billet 1 of a base stock for seamless steel tubes with piercing rolls 3 having a barrel-shaped roll body, after forming a tapered surface 2 whose ta...
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JP2000176514A |
To obtain a steel tube on the inside surface of which lap-ping marks are not generated even when the draft at the tip of a billet is reduced by forming the inlet face angle of a roll having a barrel-shaped body part in two steps and maki...
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JP2000176511A |
To pierce a billet without generating internal lapping marks and biting failure.In a method for piercing the billet 1 of a base stock for seamless steel tubes with piercing rolls 2 having a barrel-shaped roll body, after heating the bill...
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JP2000160247A |
To prevent the occurrence of scalelike eruption flaw at the external surface by carrying out soaking treatment under the condition that the soaking temperature and soaking time of a billet satisfy a specific relation.Billet is composed o...
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JP3046183B2 |
PURPOSE: To produce a seamless steel tube excellent in SSC resistance by specifying chemical components and also limiting hot rolling conditions and cooling conditions, respectively. CONSTITUTION: A steel having specific chemical compone...
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JP2000506071A |
PCT No. PCT/DE97/00507 Sec. 371 Date Sep. 11, 1998 Sec. 102(e) Date Sep. 11, 1998 PCT Filed Mar. 7, 1997 PCT Pub. No. WO97/33707 PCT Pub. Date Sep. 18, 1997A method and a device for producing a hollow body from solid round steel that has...
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JP2000140911A |
To provide a method for piercing a round billet by which hot only the generation of inside surface flaws is suppressed but productivity is raised than that by conventinal methods. In a method for piercing the round billet in which the ro...
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JP3041068B2 |
Method of rolling medium and thin walled seamless tubing involves rolling an elongated body (5) of limited length using bevel rolls (1) having a reducing pt. (9) of 2-10 deg. incline connected to a arc-shaped transition (10) and almost c...
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JP2000119749A |
To produce a Cr-Mo seamless steel pipe free from the dispersion of strength and excellent in toughness by a simplified producing process.In the case of heating a billet contg. 0.10 to 0.25% C, ≤1.0% Si, 0.2 to 2.0% Mn, ≤0.020% P, ≤...
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JP3036356B2 |
PURPOSE: To manufacture a seamless tube without the occurrence of a defect even in the case of a high expansion ratio. CONSTITUTION: A billet B is fed in the axial length direction, is rotated helically and is moved by the rotations of b...
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JP3033446B2 |
PURPOSE: To provide a continuously cast billet for seamless stainless steel pipe base stock, by which an inner surface flaw of the pipe does not develop at the time of pierce-rolling, by shifting the internal gap developed at the last so...
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