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Document Title |
JP2596861B2 |
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JP2596860B2 |
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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. ...
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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...
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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...
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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...
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JP2590595B2 |
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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 6Ï...
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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...
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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...
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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 ...
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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...
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JP2586280B2 |
PURPOSE: To enable high degree lubrication by rolling after the uniformizing treatment of a lubricant which is applied to a material to be rolled and leaving it for a specified time. CONSTITUTION: The material 1 to be rolled is piercing ...
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JP2581154B2 |
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JP2580098B2 |
PURPOSE: To manufacture a high-accuracy bar by executing the skew rolling of a rolled stock by revolving rolls in accordance with a ring having tapered parts on the inside peripheral surface. CONSTITUTION: A rolling device for a bar and ...
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JP2576254B2 |
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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...
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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...
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JP2572188B2 |
PURPOSE: To provide a piercing rolling method for a seamless steel tube by which even hard-to-work material can be efficiently piercing rolled at a low cost. CONSTITUTION: In a method by which the seamless steel tube is piercing rolled u...
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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...
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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...
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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...
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JP2561404B2 |
PURPOSE: To provide a skew rolling mill for a shafting with which stable rolling can be executed even when elongating rolls are worn, the adjustment of rolling reduction can be easily executed, the difference between circumferential spee...
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JP2560412B2 |
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JPH08309408A |
PURPOSE: To manufacture a seamless pipe made of a high alloyed steel, etc., with high rolling efficiency. CONSTITUTION: A billet made of an alloyed steel containing Cr or Ni with at least 5wt.% or over or an alloy whose main components a...
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JPH08300013A |
PURPOSE: To stably operate a mill and to improve yield by stably executing bar stripping of a mandrel mill. CONSTITUTION: The bar retained force in rolling is measured at only the final stand of the mandrel mill 4 and also 3μp(SB--SF)+F...
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JP2554703B2 |
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JPH08294712A |
PURPOSE: To provide a piercing rolling mill which can execute piercing rolling of a tube stock having large thickness/outside diameter ratio without incurring generation of tail shrink, erosion of plug tip part and deformation of a mandr...
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JPH08281311A |
PURPOSE: To extend the change range of the outlet-side diameter without deteriorate thickness deviation by arranging fixed type guide shoes facing to each other across the pass line by dividing them on the inlet side and the outlet side ...
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JP2543283B2 |
PURPOSE: To provide the process for production of the thin electric resistance welded steel pipe having the excellent roundness at the end of a small steel pipe. CONSTITUTION: Rolls are divided by ≥4 and the roll diameters are equaled ...
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JP2540183B2 |
The method of the invention relates to the manufacturing of tubes of a continuously cast or the like billet by means of cold working, wherein the temperature of the material rises to the recrystallization range due to the influence of th...
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JPH08232018A |
PURPOSE: To obtain rolling conditions capable of preventing the occurrence of cracks and flaws by specifying strain at the time of forming a high Cr ferritic steel of specific composition into a stock for seamless steel tube under specif...
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JPH08229606A |
PURPOSE: To provide a method for rolling a seamless steel tube of a high Cr ferritic steel pipe containing Mo, W and having high creep strength. CONSTITUTION: In rolling of a seamless steel tube made of high Cr ferritic steel contg. Mo, ...
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JPH08215716A |
PURPOSE: To provide a plug material excellent in erosion resistance and crack resistance for obtaining stably and efficiently the excellent quality of a product pipe in the manufacture of a high alloy seamless steel pipe, and to provide ...
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JP2525961B2 |
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JP2526447B2 |
PURPOSE: To offer a planetary reeler for improving the shape of inside surface and accuracy of thickness of tube which is rolled with a rolling mill of mandrel mill. CONSTITUTION: The planetary reeler A is arranged on the downstream side...
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JPH08209245A |
PURPOSE: To obtain a seamless steel pipe excellent in cold workability at a low cost by reheating a pipe stock constituted of an austenitic stainless steel in which the content of C is regulated, subjecting the same to hot rolling at a s...
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JPH08206710A |
PURPOSE: To more effectively prolong the life of a plug by optimizing the coating quantity of a lubricant on the surface of the plug in accordance with rolling conditions. CONSTITUTION: As for the coating quantity of the lubricant on the...
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JPH08206707A |
PURPOSE: To secure the internal quality of products with a mandrel mill by executing one pass of elongating/rolling in a one stand mill consisting of four rolls. CONSTITUTION: This mill consists of a pair of upper and lower rolls 1 and a...
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JPH08197114A |
PURPOSE: To secure a state lubricated with fluid so that the scale on the surface of a plug can be protected on the surface of the plug and to prolong the life of the plug by applying a lubricant consisting of a water-glass base water so...
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JPH08197113A |
PURPOSE: To prolong the life of a plug by applying a water-glass base lubricant whose viscosity is specified at a specified temp. on the surface of the plug. CONSTITUTION: When the plug 12 is situated in front of lubricant applying heade...
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JPH08174051A |
PURPOSE: To greatly decrease the voids from a joint boundary by cold drawing a blank in the state of coupling the mouth drawing part of an outside pipe and the mouth drawing part of an inside pipe, then sufficiently soaking and heating t...
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JP2508862B2 |
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JPH08117818A |
PURPOSE: To improve the life of a plug by applying lubricant on the whole surface of a plug before a rolling stock is rolled. CONSTITUTION: In an inclined rolling mill 10, piercing is performed with upper and lower rolling rolls 11 arran...
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JPH08117819A |
PURPOSE: To enable the secure improvement of the life of a plug by applying lubricant made from water glass solution after a water film on the surface of the plug vaporized. CONSTITUTION: In an inclined rolling mill, rolling rolls are ar...
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JPH08117817A |
PURPOSE: To easily prolong the life of a tool for a hot working, such as a plug for rolling a seamless steel pipe to be used under a severe condition like the rolling of a high alloy steel. CONSTITUTION: In the inclined rolling method fo...
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JPH0890258A |
PURPOSE: To prevent the cracking of the outer shell and the generation of the defective joining by heating an outer tube immediately before achieving the incline rolling so as to be higher in temperature compared with an inner tube by an...
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JPH0824934B2 |
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JPH0824942B2 |
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JPH0824941B2 |
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