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JP2001219204 |
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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JP2001219206 |
To obtain compact and inexpensive manufacturing equipment with which seamless steel tubes of from ordinary steel to high alloy steel are manufactured by a manufacturing line for seamless steel tubes using an inclined piercer.In this equi...
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JP2001219207 |
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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JP2001205323 |
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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JP2001205328 |
To provide a manufacturing method of seamless steel tubes and a jig for manufacturing seamless steel tubes by which products having good inside surface are made by removing the scale which is present on the inside surface of a tube stock...
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JP3214379 |
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...
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JP3214377 |
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...
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JP2001162307 |
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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JP2001162306 |
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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JP2001137913 |
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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JP2001129603 |
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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JP2001121203 |
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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JP2001105012 |
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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JP2001096304 |
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...
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JP2001058207 |
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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JP2001047101 |
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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JP2001038407 |
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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JP2001009507 |
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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JP2001009508 |
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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JP2001009510 |
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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JP2000343106 |
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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JP2000334507 |
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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JP2000334506 |
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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JP2000334505 |
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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JP2000326002 |
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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JP3129064 |
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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JP2000312907 |
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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JP3127822 |
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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JP2000301214 |
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...
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JP2000301212 |
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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JP2000301213 |
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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JP3120927 |
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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JP3119160 |
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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JP2000280008 |
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...
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JP2000280007 |
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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JP2000246354 |
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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JP2000246311 |
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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JP3106824 |
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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JP2000239807 |
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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JP2000233209 |
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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JP2000225403 |
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...
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JP2000190006 |
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...
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JP2000190007 |
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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JP2000176512 |
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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JP2000176511 |
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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JP2000176514 |
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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JP2000158017 |
To eliminate the adjustment or the changing work of the drawing device of a pierced shell with setup change in tube making by automating the drawing device of the pierced shell and making it size-free.(1) In a piercing mill provided with...
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JP2000160280 |
To obtain a heat resistant steel excellent in strength at high temperature at a low cost by providing a composition containing specific percentages of C, Si, Mn, V, and one or ≥2 elements among Nb, Ti, Ta, Hf, and Zr and also providing...
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JP2000160247 |
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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JP2000140911 |
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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