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JP3633440B2 |
To supply effectively chemical agents and the like to the internal surface of a hollow pipe stock and also prevent flaws on the internal surface of the pipe stock, when manufacturing a seamless steel pipe by a drawing rolling. (1) A manu...
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JP3630064B2 |
To greatly improve the unit consumption ratio of roll cutting by optimizing the operation rolling rolls for an outside-diameter stretch reducer. (1) This method is machining method of rolling rolls used for a caliber rolling mill having ...
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JP3624505B2 |
To prevent deterioration of the quality by fin flaws of the material by providing a curved part of roll pass shape of a four-roll stand of the angle in the prescribed range, and forming a flat part parallel to the axis of rotation of the...
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JP3624235B2 |
To eliminate defective drawing of a mandrel bar after rolling and generation of bulging flaws or faulty drawing of a tube at the time of executing thinning rolling of both end parts of a hollow tube stock with a mandrel mill. When the cu...
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JP3622499B2 |
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JP3613382B2 |
To provide a roll stand for forming a metallic tube which is advantageous in the aspect of economy and storaging property by making both size and weight of a machine to be possessed as a spare smaller than those of a conventional one. Th...
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JP2004330226A |
To provide a seamless steel pipe which is excellent in inner surface quality and also good in dimensional accuracy by using a retained type mandrel mill.A pipe stock is rolled by using the retained type mandrel mill to which a plurality ...
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JP3594046B2 |
To prevent inner face flaw generated in mandrel for drawing by making a rolling reduction at the end part of a tube stock by a mandrel mill larger than that of a normal part and increasing a bulge width of the end part of the tube stock....
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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...
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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...
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JP3571745B2 |
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JP2004217992A |
To provide an electric resistance welded tube in which anisotropy and surface part cracks do not occur on secondary working, and which has no bending and has excellent straightness on production, and to provide a production method theref...
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JP3550249B2 |
To regrind the worn part of roll and to reuse the roll by interposing a series of spur gears from the bevel gear for driving plural forming rolls and the driving part of a roll shaft and narrowing the positions of roll supporting shafts ...
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JP3544455B2 |
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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JP2004174563A |
To provide a method for controlling the structure of a metallic tube which is suitable to produce a tube material as an industrially general using material applied with large strain deformation.A structure control unit 1 provided with a ...
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JP3532819B2 |
To provide a rolling mill of which the rolling mill and devices around a driving reduction gear connected to the mill can be made compact and angularity on the inside surface of a pipe after rolling is prevented. This device consists of ...
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JP3525839B2 |
To form s skelp into an electric resistance welded tube having a circular cross section and, next, to reshape the tube into a square steel tube having high accuracy in the profile of corner parts. A round steel tube profile measuring dev...
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JP3518256B2 |
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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JP3518416B2 |
To provide a method advantageous for small-lot multi-product production with reduction mill load to manufacture product pipes of good surface quality and superior material uniformity in the circumferential direction of the pipe. In this ...
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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...
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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...
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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...
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JP3487276B2 |
To provide an apparatus and method for a fixed diameter rolling of a metallic pipe capable of preventing the generation of flashes and obtaining an excellent circularity when a plurality of metallic pipes with the same specifications are...
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JP3480407B2 |
To provide an arithmetic unit for retained force for calculating the retained force value of rolling, each time the materials are passed through each roll stand, of a motor for feeding the rolling materials to a mandrel mill. This arithm...
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JP3473553B2 |
To make a tube length and a wall thickness of the tube end after the fixed diameter rolling coincide with the target value with high accuracy. After a drawing rolling to reduce the wall thickness as well as increasing the length of a hol...
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JP2003340506A |
To efficiently suppress stripping failure and uneven thickness in consideration of misalignment between a core of a mandrel mill and an axial core of a pipe material during rolling. This mandrel mill rolls a seamless pipe with a value (F...
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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...
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JP2003290818A |
To provide a manufacturing device for a tube with a grooved inner face composed of a rolled seamless tube with which the rolling load of the rolling rolls during rolling is constant and the occurrence of a change in the groove shape and ...
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JP3454027B2 |
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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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...
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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...
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JP2003230904A |
To prevent the drawing failure of a tube stock from a mandrel in mandrel mill rolling.The tube stock into which a mandrel bar is inserted is passed through a plurality of rolling stands comprising a pair of rolling rolls, respectively, h...
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JP3429156B2 |
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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JP2003201541A |
To provide a high strength, high workability seamless steel pipe for an air bag, and to provide a production method therefor.A seamless steel pipe stock having a composition containing 0.01 to 0.10% C, ≤0.50% Si, 0.10 to 2.00% Mn, >1.0...
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JP2003200205A |
To provide a manufacturing method of a steel tube excellent in hydroforming formability and bending formability and tube-drawing workability when working parts.In this manufacturing method of the steel tube excellent in formability and w...
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JP2003193130A |
To provide a steel tube which has excellent workability.The hot reduction rolling is performed so that a ferrite fraction is controlled to ≥20%, and a reduction ratio is controlled to ≥25% to produce the steel tube.
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JP3405274B2 |
To reduce inside flaws caused when a mandrel bar is drawn with a mandrel mill. With a mandrel mill having multiple roll stands, wherein each stand is provided with a pair of mutually opposing rolls, arranged along the rolling line in suc...
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JP2003112209A |
To facilitate removal of rollers and to save the trouble accompanying roller changing in a rolling stand where a roller caliber is formed of a plurality of rollers 2 and a bar-like or tubular material is rolled.In order to adjusting the ...
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JP3397225B2 |
PURPOSE: To prevent generation of wrinkle in stretch reducing the tube stock subjected to thinning of both tube ends by a mandrel mill. CONSTITUTION: In the method in which the tube stock thinned tube end by a hydraulic reducing mechanis...
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JP3395651B2 |
To provide a transporting roller device which is easily replaced with a stand for steel tube mills. (1) In the transporting roller device which is provided on the stand of the poststage of a three-roll steel tube mill train, the cross se...
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JP3391280B2 |
To prevent the bend of a tube generated by the deviation of the pass line of a three-roll type sizing machine in a tube-making process from the reference point. Position regulating mechanisms 4a, 4b, 4c, 4a', 4b', 4c' with which the roll...
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JP3379499B2 |
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JP3380765B2 |
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JP3369297B2 |
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JP3368834B2 |
To provide a manufacturing method of a seamless steel tube capable of stably obtaining a product tube of 0.2 mm or less in depth of a flaw in an inner surface and the seamless steel tube having excellent inner surface quality which is ob...
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JP3365348B2 |
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JP3361375B2 |
Pre-reduction equipment for guiding a pipe blank and reducing its end before it enters an "Assel" rolling mill, which is disposed immediately downstream from the pre-reduction equipment and consists of several freely rotatable rollers, w...
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JP3353880B2 |
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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JP3348670B2 |
To control occurrence of flaws such as seizure when high alloy steel pipes are rolled, prolong the pipe making life of a mandrel bar, and improve inner surface quality of seamless pipes by forming a Cr plating film with specific values o...
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JP3348646B2 |
To make it possible to produce a steel pipe having a thickness smaller with respect to an outside diameter by forming a steel strip to a round shape by a forming butt-welding machine, butt-welding both edges thereof and imparting tension...
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