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JP10180312 |
To prevent generation of defects such as crack in the end part of a tube stock and the like due to δ ferrite at the time of piercing rolling of cast billet for seamless tube with a piercer by rolling billet under satisfying specified co...
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JP10180314 |
To roll a hard-to-work tube stock such as a Ni-base alloy tube without generating cracks on the inside surface. This rolling method is composed so that the tube stock is drawn while imparting tensile force to the tube stock H from the fr...
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JP10180315 |
To obtain a plug with much more improved life time than in the conventional are under a severe condition of being constantly exposed to high temperature and high load by changing a part of plug located at the outermost surface of plug wi...
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JP10175049 |
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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JP10166124 |
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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JP10140238 |
To produce a seamless steel tube for an accumulator for air bag system, excellent in workability and weldability and having high strength and high toughness. A steel, having a composition consisting of 0.01-<0.20% C, ≤0.50% Si, 0.30-2....
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JP10130687 |
To obtain a lubricant compsn. for hot working which can reduce the coefficient of friction between a working tool and a workpiece and prolong the service life of a working tool in hot working, such as tilting rolling of a seamless steel ...
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JP10128427 |
To minimize the roughness of the outer surface of a seamless steel tube, to minimize the polishing work or the like in off-line and to save labor by jetting a high pressured water on the outer surface of a hot tube under carrying before ...
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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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JP2775029 |
To provide a device for executing skew rolling of tube-shaped or bar-shaped rolling stock. In order to feed a rolling stock, a roll 2, whose roll axis 4 is, seen in the direction of longitudinal axis 3 of the rolling stock, inclined to t...
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JP2770870 |
PURPOSE: To manufacture an aluminum tube high in out-of-roundness and adequate in surface roughness by working the tube under rolling pressure after the outer peripheral surface of the tube is cut. CONSTITUTION: After the outer periphera...
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JP10094808 |
To provide a roller shoe for inclined rolling mills by which so-called flare (enlargement of the diameter in end parts) in the end parts of a pierced or stretched tube stock in the inclined rolling mill for manufacturing the seamless ste...
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JP10094807 |
To provide the method and device capable of controlling a roll forming based on the weight of a workpiece in a forming device having two oppositely arranged forming rolls constituted so that at least its one roll is moved neare to away f...
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JP10085804 |
To provide a method for manufacturing a seamless tube which consists of an α-type or α+β type titanium alloy containing an inhibstor of the coarsening of structure, whose strength and ductility are higher in the same order in both dir...
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JP10080715 |
To use a steel tube cold worked as it is by controlling a final finish working rate as taking a ratio of a working rate between tube thickness and outer diameter for a parameter when producing a two phase or austenitic stainless steel tu...
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JP2754999 |
PURPOSE: To provide a method and a device for carrying out inclined rolling for nearly eliminating a gap between the inclined roll and a disk roll and preventing down buckling. CONSTITUTION: A billet 6 is rolled for perforation by an inc...
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JP10058014 |
To contrive reduction of flaws on the outside surface to which a guide is related and prolongation of the life of the guide in rolling with an elongator. In the case that a hollow tube stock after piercing with a piercer is elongation ro...
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JP10058013 |
To make hot rolling into one process and to enable cost reduction by making a solid round billet having a diameter not more than a prescribed outside diameter into a hollow tube stock and executing cold diameter reducing/ elongating work...
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JP10043803 |
To extend plug life by using a temp. control means, arithmetic means, controller, etc., in the piercing rolling method of hot seamless metal tube so as to suppress erosion of the tip part and side face part of a plug. An arithmetic means...
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JP10034304 |
To reduce the producing cost of a seamless steel tube containing Cr by using saddle type roll having a prescribed angle range of an opening angle at the caliber bottom in one pair of rolls. Rolling reduction is applied to a cast billet 1...
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JP10015604 |
To remove scale, scraps of tube end or the like which are presented in the interior of a pierced material almost completely and to drastically restrain the generation of pock marks and pits. Between a 1st piercer 1 and the 2nd piercer 2 ...
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JP10005820 |
To provide a piercing rolling method of a metallic tube. When the opening degree of main rolls is expressed by Rg, the opening degree of guide members by Gg, the outside diameter of a solid round billet by Bd, the effective length of a p...
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JP2730460 |
PURPOSE: To improve a peeling limit, and to reduce the generation factor of a guide shoe mark by that the projection of a piercing shell between a main roll and a guide shoe, becomes less. CONSTITUTION: When piercing a seamless steel pip...
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JP2729209 |
To provide a method for diagonal piercing rolling which is capable of averting the incorrect rolling and working hindrance of thick or thin tube stocks of an about middle extent and a diagonal piecing roll stand for this purpose. This ma...
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JP09314206 |
To inexpensively obtain the long size hollow bar steel with high dimen sional precision, small diameter and thick wall by making the bar steel a hollow base stock satisfying a specific formula after piercing the bar steel by a pierce, an...
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JP09310121 |
To produce a steel tube excellent in high temp. creep fracture characteristics and toughness by subjecting a steel stock having a specified compsn. to blooming, executing cooling, holding the same under soaking to an austenite single pha...
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JP09300006 |
To manufacture a round cast billet having good endoplasm using existing continuous casting equipment and, next, to manufacture a seamless steel tube difficult to be worked without causing miss roll in piercing and, without generating the...
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JP09300007 |
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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JP2718865 |
PURPOSE: To obtain a steel tube as rolled having a fine grain structure of over an austenitic grain size No 8 by cooling after a hollow steel tube stock containing the prescribed quantity of Nb is worked under the prescribed condition wi...
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JP2715396 |
PURPOSE: To improve safety of descaling the inside surface of a seamless steel tube. CONSTITUTION: By this device, a mandrel bar 2 fitted with an injecting nozzle 1 at a tip end is supported by a bar block 3 and fixed on a truck 4 and th...
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JP09287028 |
To provide a method for efficiently producing on-line a seamless steel pipe excellent in the performance, and also provide an on-line equipment therefor having apparatuses from casting to heat treatment. This production method comprises ...
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JP09276907 |
To manufacture an austenitic stainless steel seamless tube by on-line solution heat treatment. After heating a billet of austenitic stainless steel, hot piercing and successively executing finish rolling (elongating work + finishing work...
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JP09271811 |
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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JP09271810 |
To prevent generation of flaw on an external surface by specifying so that a radius of a corner part of slab has a specified ratio to a side length when a martensitic stainless steel slab is pierced by a press roll piercer. A martensitic...
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JP2705499 |
PURPOSE: To improve the quality of an inside surface and to reduce the maintenance cost as to the inside surface. CONSTITUTION: In a method in which a hot drawn seamless carbon steel tube is manufactured by drawing it to reduce the thick...
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JP09248605 |
To reduce the defective ratio of a hollow stock tube and to improve the yield by predicting the fusing damage of the tip part of a plug based on the measured result of a measuring means of a billet progressing velocity and a measuring me...
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JP09239416 |
To surely prevent the generation of inadequate pullingout of a mandrel without frequent control action during operating a retract mandrel mill and to stably execute the pulling-out of the mandrel over a long period. During operating roll...
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JP09220603 |
To highly efficiently manufacture a thick-wall seamless steel tube having the highly precise dimension of an outside diameter by restricting the variation of outside diameter by a plug mill, controlling the temp. of a stock tube to a pre...
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JP09201604 |
To provide a method by which a seamless tube without a carburized layer on its inside surface is highly efficiently manufactured. Rough rolling with a mandrel mill using a graphitic lubricant, reheating and finish rolling with a stretch ...
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JP09108712 |
To prolong the life of a guide shoe, in rolling a seamless steel tube by a inclined rolling mill, by providing a water passage inside the guide shoe of the rolling mill and rolling with this passage cooled by water. A crank-shaped water ...
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JP09108711 |
To eliminate uneven thickness produced in base stock, forming and bead grinding, to allow on-line tube making of a steel tube having a satisfactory dimensional precision comparable to a conventional drawn tube, and to obtain a technology...
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JP2636683 |
PURPOSE: To eliminate a hot saw and to improve the yield of tube manufacturing by pressing down fins, over fillings which are generated by elongating with a mandrel mill and crushing allowance at the time of bar stripping by providing a ...
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JP09094623 |
To provide a manufacturing method for a metallic tube with spiral fins. In the manufacturing method for the metallic tube with the spiral fin having ≥5mm height on the outer periphery of a pipe stock by applying cold-cross helical roll...
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JP09087743 |
To provide a method for producing a low yield ratio and high tougness rectangular steel pipe low in yield ratio, excellent in low temp. toughness and free from the need of a heat treating stage. A steel stock contg. ≤0.20% C and prefer...
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JP09070604 |
To manufacture a titanium pipe at a low cost without making a rolling flaw occur on the outside surface of the pipe by Mannesmann rolling method. After coating by thermal spraying or application of a metal containing 90% Al or over on th...
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JP09059719 |
To produce a seamless steel tube having high strength and excellent in toughness and corrosion resistance by successively subjecting a steel billet of specific composition to piercing, to rolling at respectively specified reduction of ar...
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JP09057308 |
To obtain a piercing device in which the tip of a plug is prevented from eroding by using an analysis model in a piercing method of a seamless metallic tube. In a piercing device, the temp., which is measured with a temp. measuring devic...
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JP09057309 |
To provide a high expansion ratio piercing method without generating inside grazing caused by a plug. After setting setup so that the inner peripheral length of a hollow tube stock is larger than the outer peripheral length in the max. d...
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JP09057310 |
To obtain a method for drawing, reducing and sizing a seamless metallic tube by which defective bar stripping is not generated even when drawing, reducing and sizing are executed, by using a size capable of interstand tension imparting r...
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JP09059718 |
To produce a seamless steel tube having high strength and excellent in toughness and corrosion resistance by successively subjecting a steel billet of specific composition to piercing, to rolling at respectively specified reduction of ar...
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