Login| Sign Up| Help| Contact|

Patent Searching and Data


Matches 601 - 650 out of 1,579

Document Document Title
JP2596861B2  
JP2596860B2  
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. ...  
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...  
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...  
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  
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...  
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...  
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...  
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 ...  
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...  
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 ...  
JP2581154B2  
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 ...  
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...  
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...  
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...  
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...  
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...  
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...  
JP2560412B2  
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...  
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...  
JP2554703B2  
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...  
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 ...  
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 ...  
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...  
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...  
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, ...  
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 ...  
JP2525961B2  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
JP2508862B2  
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...  
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...  
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...  
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...  
JPH0824934B2  
JPH0824942B2  
JPH0824941B2  

Matches 601 - 650 out of 1,579