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Patent Searching and Data


Matches 701 - 750 out of 2,167

Document Document Title
JPH1058014A
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...  
JPH1058013A
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...  
JPH1043803A
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...  
JPH1034304A
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...  
JP2703814B2  
JPH1015604A
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 ...  
JP2696718B2  
JP2697144B2  
JPH105820A
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...  
JP2558263Y2  
JP2729209B2
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...  
JP2730460B2
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...  
JP2692524B2  
JP2692474B2  
JPH09314206A
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...  
JPH09310121A
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...  
JPH09300007A
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...  
JPH09300006A
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...  
JP2718865B2
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...  
JP2715396B2
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...  
JP2671960B2  
JP2672441B2  
JPH09287028A
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 ...  
JPH09276907A
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...  
JPH09271811A
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...  
JPH09271810A
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...  
JP2550896Y2  
JP2550897Y2  
JP2705499B2
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...  
JP2661490B2  
JP2662122B2  
JPH09248605A
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...  
JPH09239416A
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...  
JPH09220603A
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...  
JP2643369B2  
JP2641834B2  
JPH09201604A
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 ...  
JPH09108712A
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 ...  
JPH09108711A
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...  
JP2636683B2
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 ...  
JPH0994623A
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...  
JP2596861B2  
JP2596860B2  
JPH0987743A
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...  
JPH0970604A
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...  
JP2590595B2  
JPH0957309A
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...  
JPH0957310A
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...  
JPH0959718A
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...  
JPH0957308A
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...  

Matches 701 - 750 out of 2,167