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Matches 651 - 700 out of 2,101

Document Document Title
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...  
JPH0959719A
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...  
JP2605541B2
PURPOSE: To prevent indents in the shape of an inside pit given by pressing in inside scales of a hollow tube stock. CONSTITUTION: A draw starting position of the hollow tube stock 3 by rolling rolls 1 and a plug 2 is set on the outlet s...  
JP2605561B2
PURPOSE: To measure the pass center of bar steadyer with high accuracy and in a short time. CONSTITUTION: This device consists of a laser beam emitting device 2 irradiating with laser beam in the opposite direction which is provided on o...  
JP2605560B2
PURPOSE: To simultaneously measure not only the roll center of bar steadyer but the parallelism to the mill center. CONSTITUTION: This device consists of a laser beam emitting device irradiating in the opposite direction with laser beam ...  
JP2581154B2  
JPH0929309A
To improve the accuracy of inside diameter at tube ends in the manufacturing method of a seamless tube by Mannesmann plug mill process by increasing thickness in both end parts of the tube by controlling the opening degree of roll and in...  
JPH0929310A
To remarkably improve the reuse rate by regrinding of a piercing plug by providing a parallel part having the min. length of the outside diameter same as the max. diameter part which is not shorter than a prescribed value at the rear of ...  
JP2576254B2  
JPH0925541A
To produce a long-size hollow bar steel increased in the ratio between wall thickness and outside diameter by respectively specifying, at a cross helical rolling mill, the temp. before rolling, rolling temp., and outside diameter reducti...  
JPH0920972A
To stably produce a titanium seamless tubular material free from the generation of reluctant surface patterns, in a ring rolling method, by specifying the working degree in forging after rapid cooling in the process of forging and the wo...  
JPH0919705A
To improve the useful life of a plug and to enable the improvement of rolling efficiency and reduction of the consumption unit of tools by piercing high alloy and high-alloy steel billets using the plug having specified dimensions. The r...  
JPH0910806A
To prevent stoppage by biting and flare phenomenon at a tube end and obtain a beautiful product in outer surface property by arranging non-driven roller guides facing to each other in the adjacent position to rolling rolls on a pass line...  
JP2595856B2
PURPOSE: To prevent the generation of a rash flaw on an inner surface in manufacture of a seamless clad metallic tube by hot rolling work of a hollow double tube stock which a metal difficult to be worked is arranged to the inner layer. ...  
JPH091210A
PURPOSE: To easily prolong the life of a tool for hot working such as a plug for rolling a seamless steel tube which is used under severe conditions such as rolling of high alloy steel. CONSTITUTION: In a skew rolling method of the seaml...  
JP2591386B2
PURPOSE: To prevent carburization, which tends to be a problem when graphite lubricant is used, and to prevent the dents on the inside of a pipe due to oxide scale. CONSTITUTION: A mixture of a calcium compound and graphite is used as th...  
JPH08332504A
PURPOSE: To manufacture a seamless tube consisting of high alloy steel or the like at high efficiency of rolling. CONSTITUTION: A billet 1 consists of an allay steel contg. at least ≥5wt.% Cr or Ni, or an alloy consisting essentially o...  
JP2586246B2
PURPOSE: To restrain indentation flaws by inside scales of a hot seamless tube manufactured by piercing and strech-rolling. CONSTITUTION: The inside temperature of the material which is being elongated by rolling is restrained below the ...  
JP2586772B2
PURPOSE: To reduce the uneven wall thickness and produce less inner surface flaws during the inclined drawing and rolling operation. CONSTITUTION: The length Lt of the part where a plug is brought into contact with the material is set 6...  
JP2586274B2
PURPOSE: To prevent fouling and stripe-like flaws that are generated at the time of manufacturing a seamless steel tube from a stainless steel by making the thickness of a scale layer which is stuck to the outer surface of a solid billet...  

Matches 651 - 700 out of 2,101