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JP11123410 |
To provide a mandrel pulling-out device in accordance with emergency pulling-out of a mandrel atendant upon abnormal rolling and mandrel mill using the same. In the mandrel pulling-out device 6 for mandrels having a U-shaped guide 7 on w...
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JP11123411 |
To provide a piercing tool for press rolls with which a good inside surface is obtained without generating burning on a material to be pierced and which is excellent in resistance to cracking and piercing method of the press roll using t...
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JP11104711 |
To obtain a product; wherein the curvature of the square part is small even if the product is thick, and the sides are plane. In this method when a cylindrical base pipe obtained by making a fillet bored by a seamless steel pipe manufact...
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JP11104710 |
To obtain a product, corner roundness of which is small and side is flat, by hot-rolling an angle pipe with an angle molding stand, after a cross section of a cylindrical element tube is molded into an oval shape of specific ellipticity ...
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JP11083748 |
To observe fluidity of lubricant by sequential observation of a fault occurring state at the time of extruding, by inserting a simulation material inner surface observing unit in a transparent hollow mandrel, and observing an inner surfa...
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JP11077140 |
To achieve an improvement of productivity and a simplification of control of transfer by taking measures in need of no adjustment of transfer velocity to maintain a target material temperature at the time of changing a flying sheet thick...
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JP11077115 |
To provide a tightly scaled steel tube which is manufactured by stretch-reducing without anxiety about penetrating of scale and work hardening, excellent in adhesive strength of scale in products and eliminates the need of pickling befor...
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JP11077148 |
To provide a manufacturing equipment line and a manufacturing method for a steel tube having few uneven thickness in the circumferential direction of the tube. After a band steel 1 is preheated at ≤800°C, it is continuously formed wit...
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JP11077135 |
To prevent the generation of operation interrupting trouble at the time of transporting a steel tube by providing an elevating/lowering means for interlocking rollers, guides and a trough so that the transporting line of the steel tube b...
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JP11077116 |
To provide a manufacturing method for high-strength steel tube having the tensile strength of ≥600 MPa and high toughness and high ductility and excellent in fatigue resistance. By executing stretch reduction of the steel tube of a bas...
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JP11057818 |
To provide a press rolling method of a steel pipe which can manufacture the steel pipe with excellent surface quality, of which surface roughness is small with sufficient thin scale. In this press rolling method of the steel pipe, the st...
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JP11057816 |
To provide a press rolling method of the tube which does not promote external surface defects of the tube and crops without a complicated mechanism and also reduces angulation inside the tube. This method is a press rolling method for ob...
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JP11057817 |
To provide a method for making a stainless steel pipe which is excellent in elongation characteristic for obtaining product pipes which are more excellent in the elongation characteristic in the identical strength level than the conventi...
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JP11057819 |
To provide the manufacturing method of the steel alloy tube of high- strength and high-toughness. A base tube, which is composed, by weight, of 0.30% or less C, 1.5% or less Si, 1.0% or less Mn, 0.001-0.01% Al, 2 plus-10% Cr, and 1.0-2.5...
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JP11057820 |
To provide a method, wherein manufacture of an angle tube with a small corner roundness at the corner part and high flatness at the side part even if a wall is thick by applying the compressive force which arises from the difference of a...
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JP11036017 |
To provide a seamless non-heat treated steel tube having ≥882 N/mm2 tensile strength and ≥0.75 yield ratio which are equal to those of a heat treated material, also having ≥49 J/cm2 2UE20°C (an impact value at 20°C by the 2 mm U-...
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JP11028507 |
To obtain an excellent inner surface property even in the case of rolling with a large rolling reduction by specifying the transfer speed of a plug and feeding a powdery lubricant consisting of the mixture of powder of oxide, a hydroxide...
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JP11010206 |
To provide a manufacturing method for a steel tube with thin scale whose the scale thickness is ≤3.0 μm and which is excellent in surface properties. After heating a base steel tube preferably at <800°C, stretch reduction in which th...
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JP11010205 |
To keep the surface of rolling roll always in a clean state by providing a scraper in contact with the surface of rolling groove of rolling roll to remove foreign matters of metallic refuse and the like adhering to the surface. The rolli...
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JP10328722 |
To uniformalize a thickness in the longitudinal direction of the tip part and the rear end part of a tube stock after stretch reduction by measuring the thickness changes of the tip part and the rear end part of the tube stock after the ...
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JP10314834 |
To prevent thickness deviation in the peripheral direction after stretch reduction by making temp. deviation in the peripheral direction at the time of starting stretch reduction fall into a proper range. In this method, a pressure-welde...
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JP10305305 |
To give excellent circularity to seamless steel tubes to be processed in a hot rolling mill producing set diameter of tube by means of keeping the length of average outer diameter at a specified length and by straightening the tube with ...
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JP10286602 |
To provide a seamless tube consisting of industrial pure titanium which has high strength and ductility in both directions of the length direction, in which the peripheral direction and characteristic difference between both directions o...
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JP10277608 |
To provide a drawing method of a metallic tube by which a round tube whose angular rate is ≤1% is easily obtained by rolling with a stretch reducer whose elliptic rate is in the ordinary range (0-12%). By selecting the diameter reducin...
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JP10277609 |
To remarkably reduce the roll setting-up frequency of reduction equipment by making it possible to rotate the housing of an idle roll stand around a tube axis center, and rotating the housing in the direction reducing the squarishness of...
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JP10273723 |
To simplify the manufacturing process of a seamless steel tube excellent in refractoriness and to attain energy saving. A billet, which has a composition containing 0.04-0.15% C, ≤0.5% Si, 0.5-2.0% Mn, 0.1-1.0% Mo, ≤0.010% Al, ≤0.0...
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JP10263626 |
To efficiency produce a seamless square steel pipe having small roundness at the corner parts in the cross section and flat sides by hot-rolling a cylindrical base stock so that the reduction rate of area from the round pipe stock to the...
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JP10258303 |
To provide a manufacturing method of a square seamless steel tube for obtaining a product having small roundness in corner parts and flat sides even when its wall is thick. At the time of forming a cylindrical tube stock which is obtaine...
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JP10235422 |
To effectively improve the bar-stripping property even when the coefficient of friction between a mandrel bar and a shell is varied by changing the properties of the surface of the mandrel bar. Tension which acts on the shell A between m...
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JP10211509 |
To efficiently execute sizing of a steel tube in wide dimensional range of an outside diameter with a sizing stand having the roll diameter suitable to the outside diameter, number of roll stages, roll interval and roll space. The sizing...
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JP10211510 |
To exactly prevent bends generated on a tubular body with existing equipment and to improve the product yield and manufacturing efficiency at the time of manufacturing a seamless tube through a sizing stage with a sizing machine such as ...
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JP10204529 |
To produce a building seamless steel pipe excellent in fire resistance even if the amt. of expensive alloy elements to be added is suppressed to a low degree. A billet having a compsn. contg. 0.04 to 0.15% C, ≤0.5% Si, 0.5 to 1.7% Mn, ...
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JP10156412 |
To suppress angularity in 3-roll continuous multistand rolling by imparting a caliber shape the distance between the pass center and the caliber of which is larger than that of a conventional caliber in the vicinity of a prescribed point...
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JP10137816 |
To make a mandrel bar so as to be cut of from a pulling-out device when the mandrel bar is pulled out of a seamless tube. In this pulling-out device, a neck part which is provided in the end part of the mandrel bar is fit into the recess...
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JP10128412 |
To provide a manufacturing method of 13 Cr base stainless steel tube covered with mill scale excellent in surface property and corrosion resis tance by controlling scale in descaling and rolling. About a hollow tube stock of stainless st...
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JP2775419 |
To obtain a produce pipe having uniform quality without expanding the size of a pipe rolling mill by providing plural groves in the peripheries of rolls, rotating a pipe stock in each one pass and moving successively toward plural groove...
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JP10099907 |
To perform the tail catching at a speed close to the actual deceleration of a tube stock integrated with a mandrel bar by measuring the deceleration of the tube stock, operating the value, and setting the next deceleration start timing o...
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JP10094804 |
To obtain a tube excellent in strength in a thickness direction by performing working with a specific area reducing factor to a titanium alloy at specific temperature, and making a ratio of a total area reducing factor making a flow of m...
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JP10094806 |
To prevent an occurrence of fin flaws of a material in an outside diameter contracting stand by measuring an outside diameter in each position in the axial length direction of a hollow tube stock on the inlet side of the outside diameter...
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JP2765390 |
PURPOSE: To obtain a highly accurate tube without dimensional fluctuation by rolling after supplying a lubricant through a hollow mandrel and injecting the lubricant on the inner surface of a hollow tube stock before rolling. CONSTITUTIO...
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JP10071405 |
To obtain the interior elliptic tube with complete roundness in outside diameter, having arbitrary ellipticity by shifting the caliber center positions of adjacent roll stands from a pass center in the roll gap extending direction of thr...
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JP10071422 |
To provide a manufacturing method by an induction heating system by which a steel tube having excellent seam quality and surface skin is manufactured at high productivity and the manufacture in accordance with small lot many kinds produc...
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JP10052705 |
To obtain a rolling block enabling manufacture with a small size and at a low cost by forming transmitting device steps between a distributing transmission device and a connecting shaft and between a deflecting transmission device and th...
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JP2748852 |
PURPOSE: To minimize difference with the target length of stretch length of a seamless tube. CONSTITUTION: Speed integral type length measuring instruments 14, 16, and 18 and temperature detectors 15, 17, and 19 are installed at the exit...
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JP10043802 |
To provide a press roll piercing method capable of making the service life of a plug long in a press roll piercing method. In the case of piercing an angle billet 4 with the press roll piercing method manufacturing a hollow stock from th...
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JP10046290 |
To improve creep resistance and hot workability by specifying a composition. It is found that the manufacture of a seamless steel tube excellent in creep resistance at ≥550°C by the Mannnesman piercing method is made possible by addin...
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JP10029005 |
To highly efficiently produce an eliptic inner surface tube by displacing the center position in either one side caliver between adjacent roll stands in the extending direction of the roll gap from a pass center. In the case of displacin...
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JP10005817 |
To obtain the wall thickness variation reducing effect by estimating a draft amount to be applied onto four roll stands based on the external diameter of a core metal bar after heat expansion obtained by calculating and rolling the draft...
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JP10005818 |
To largely make an external diameter rolling reduction at one pass by using a continuous rolling machine arranged tandem with plural numbers of four roll stands with almost circular roll hole die, maintaining the material temperature in ...
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JP10005815 |
To effectively reduce thickness deviation by obtaining roll reduction position correction amount of every two pairs of caliber rolls from mutual interference coefficient affecting a rolling load between two pairs of caliber rolls set ort...
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