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Matches 651 - 700 out of 1,208

Document Document Title
JPH0523710A
PURPOSE: To provide a forge-welded steel tube manufacturing equipment which can manufacture a forge-welded tube with a high efficiency. CONSTITUTION: After a band steel is heated in a heating furnace 5 the band steel is formed into a tub...  
JPH057990A
PURPOSE: To prevent a flow generated in inside of a pipe by casting a cast slab for a continuous casting having the specific value of length ratio of a long side and a short side at a specific temp. and rolling the cast slab at the speci...  
JPH05305A
PURPOSE: To provide means for preventing rolling flaws on the outer surface of tube that bring troubles of cost and productivity in the time of manufacturing a seamless tube of high chromium steel by Mannesmann rolling process. CONSTITUT...  
JPH04371307A
PURPOSE: To secure a prescribed target length by reducing the variation in length in the final stage of rolling. CONSTITUTION: The actual length of a base stock which is obtained in the stage just before the final stage of rolling is com...  
JPH04367307A
PURPOSE: To provide a manufacturing method for a two-phase stainless steel pipe excellent in the quality of an outside pipe surface with less rolling scratches. CONSTITUTION: By using a square bloom whose corner parts are preliminarily g...  
JPH04358025A
PURPOSE: To produce a seamless steel tube having fine-grained structure and excellent in toughness by controlling steel components and hot rolling conditions, respectively. CONSTITUTION: A billet of a steel which has a composition consis...  
JPH04319002A
PURPOSE: To provide a small inclined planet roll device with high rigidity by restraining fixing one of two input shafts. CONSTITUTION: One or more kinds of working rolls 1, back up rolls 2 or reinforced rings 5 are driven. At the time o...  
JPH04319006A
PURPOSE: To prevent the generation of the outside surface flaw and inside surface flaw of rolled stock by reducing slip between rolls and a material to be rolled in a Mannesmann type inclined piercer. CONSTITUTION: Rolling is executed by...  
JPH04316750A
PURPOSE: To simplify the structure of a machining device and to reduce the size thereof by locating the drum part of a plurality of sets of rollers so that the rollers are brought into contact with the inner surface of a friction ring mo...  
JPH04316831A
PURPOSE: To efficiently subject a shaft material such as a pipe material or a rod material to twist elongation processing at a high speed by selecting a path so as to specify the surface twist angle of the shaft material on an outlet sid...  
JPH04309402A
PURPOSE: To obtain the seamless steel pipe having the performance equal to the performance of a SUS 304 stainless steel by using a SUS 304L stainless steel without executing a soln. heat treatment. CONSTITUTION: This invention relates to...  
JPH04294804A
PURPOSE: To offer a means for restraining the generation of wrinkle-like defects on the outer surface when a solid billet is pierced by hot piercing rolling. CONSTITUTION: The solid billet 4 which is heated in a rotary hearth furnace 1 i...  
JPH04288995A
PURPOSE: To reduce the shearing strain of a shaft material by constituting a pass so that the work partial charge is migrated continuously from one pair to the other pair in connection with an advance, with respect to two pairs of roller...  
JPH04284904A
PURPOSE: To prevent a cutting surface from being oxidized continuously by atmosphere and to thin the material through hot rolling by carrying out piercing rolling, removal of an oxidized layer, sealing the inside and outside surfaces of ...  
JPH04274807A
PURPOSE: To prevent the generation of seizure on guide shoe surfaces. CONSTITUTION: The piercing machine 10 constituted by disposing a pair of inclined rolls 11 so as to face each other, disposing a plug 12 at the center of the rolling r...  
JPH04274806A
PURPOSE: To prevent the tube end crack and the rolling trouble, and to improve the rolling work efficiency and the yield of a product, at the time of manufactur ing a seamless alloy steel tube. CONSTITUTION: Common steel square pieces 3,...  
JPH04266411A
PURPOSE: To provide a shaft material working device easy to change a pair of rollers by making up a pair of inclined rollers to clamp and advance the shaft material into such a state that they are twisted in a cage as skelton round a pas...  
JPH04266405A
PURPOSE: To enable manufacture of an inside grooved steel tube provided with a reasonable shape though the thickness is large. CONSTITUTION: The manufacturing device of an inside grooved seamless steel tube having a pair of rolling rolls...  
JPH04254520A
PURPOSE: To offer a method for manufacturing a resistance welded oil well pipe high in the Young's modulus in the circumferential direction of the steel pipe and excellent in crushing properties. CONSTITUTION: This is a method for manufa...  
JPH04254521A
PURPOSE: To manufacture a resistance welded oil well pipe high in the Young's modulus in the circumferential direction and excellent in crushing properties by subjecting the cast slab of a steel having a specified compsn. contg. C, Si an...  
JPH04251604A
PURPOSE: To beforehand prevent the generation of abnormality of peeling, buckling, etc., by restraining bottom flare in the terminal part of tube at the time of skew rolling using a piercer, elongater, etc. CONSTITUTION: The terminal of ...  
JPH04231105A
PURPOSE: To embody elongating and rolling with the highest possible efficiency without the deterioration of quality with a smaller number of roll stands by minimizing the number of the roll stands as far as possible. CONSTITUTION: The ro...  
JPH04224008A
PURPOSE: To provide a method and device for manufacturing a seamless pipe having medium-thick and thin walls which is in a region of diameter/thickness ratio of 15:1 to 50:1, has a least possible cost of device and an excellent surface q...  
JPH04224009A
PURPOSE: To manufacture a seamless stainless steel tube excellent in the outside quality of the tube by minimizing surface defects by an elongator and forming titanium film on the surface, whereon flaws do not grow in spite of reduction ...  
JPH04224004A
PURPOSE: To obtain a rotary ring mill easy to bite material. CONSTITUTION: In the rotary ring mill wherein the barrel parts of rolls are brought into contact with the inside surface of a driving ring and a tube or a bar is worked between...  
JPH04187310A
PURPOSE: To restrain the generation of inside surface flaw and to obtain a stainless steel tube excellent in the quality of inside surface by rationalizing the inclination angle of the main rolls of an elongator, elongation ratio and int...  
JPH04182010A
PURPOSE: To prevent the inside surface of tube from generating oxidized scale by applying liquid glass lubricant on the inside surface of the tube of compound material before heating in the manufacture of a clad steel tube by skew rollin...  
JPH04182008A
PURPOSE: To prevent the generation of the interior defect of tube by specifying piercing rolling conditions at the time of manufacturing a seamless tube. CONSTITUTION: At the time of manufacturing the seamless tube, when a billet (base s...  
JPH04178204A
PURPOSE: To remove the carburized part due to the plug mill rolling while making the total cost minimum by specifying the thickness reducing amount of the plug mill and the rolling temperature of one pass time, and rolling by controlling...  
JPH04172112A
PURPOSE: To prevent the generation f shoe mark due to the seizure of the guide shoe almost completely by rolling after coating the outer circumferential surface of the round steel bar or the tube stock of the high temperature state with ...  
JPH04167905A
PURPOSE: To prevent the development of peeling caused to development of miss roll by arranging a fixed guide at between each disk roll and cross helical roll and bringing the fixed guide into sliding contact with outer peripheral face of...  
JPH04158908A
PURPOSE: To obtain a seamless steel tube of duplex stainless steel excellent in the outside surface quality of tube without rolling flaw that is harmful to productivity and cost by rolling by Mannesmann process for making tube using a ro...  
JPH04157005A
PURPOSE: To reduce defective products by measuring the amplitude of vibration of a shell on the outlet side of an elongator with the measuring sensor of a single axis CCD camera, sending these signals to a means for judging amplitude of ...  
JPH04157006A
PURPOSE: To reduce thickness deviation by affixing a strain gage on the inside surface of the bar cap of a mandrel bar, receiving electric signals in accordance with the strain from the strain gage on a radio and diagnosing inconsistency...  
JPH04147705A
PURPOSE: To produce the corrosion resistant metallic pipe which allows the remaining of uniform residual stresses and the reproduction thereof by fitting roller supporting metals which support elongating rollers freely movably forward an...  
JPH04147706A
PURPOSE: To improve the life of a plug for piercing by specifying the relation between the diameter and effective length of the plug. CONSTITUTION: The diameter of the plug for producing a seamless steel pipe, designated as Dp and the ef...  
JPH04147708A
PURPOSE: To improve the dimensional accuracy of a steel pipe by attaining the target rolling torque meeting the rolling speed of a reeling mill in order to attain the coincidence of a thickness rolling reduction and a target thickness ro...  
JPH04147704A
PURPOSE: To prevent the generation of inside surface flaws by specifying the relations among the heating temp. of a blank material, the upper and lower limits thereof, the straining rate of piercing, the sulfur concn. of the blank materi...  
JPH04143219A
PURPOSE: To form a uniform and superfine austenite structure and to produce a hot rolled bar steel excellent in strength, toughness, and corrosion resistance by inversely transforming ferrite phase into austenite phase while applying pla...  
JPH04143006A
PURPOSE: To prolong the life of a mechanism for removing secondary scale by making a cooling bar which is provided in the tip part of a mandrel bar of elongator for manufacturing seamless tube and which is communicated with a path for co...  
JPH04143004A
PURPOSE: To prevent rear end contraction by retreating a plug at the point of time of rolling the predetermined part on the rear end side in the rolling direction of a base stock in the skew rolling of seamless tube. CONSTITUTION: At the...  
JPH04143012A
PURPOSE: To prevent the generation of uneven wall thickness due to the inclined roll on the drilling process by storing the inclining deviated speed wave shape caused by the universal joint and controlling the rotation speed of the drivi...  
JPH04143005A
PURPOSE: To improve the unit requirement of fuel by specifying a heating temp. and gorge in the manufacture of seamless tube with a Mannesmman type skew rolling mill. CONSTITUTION: In the manufacture of seamless tube with the Mannesmann ...  
JPH04138807A
PURPOSE: To prevent the generation of the pressed flaw of ceramic oxidized scale on the surface of tube and to reduce the repair rate of the surface of tube of the final product by heating a billet after ceramic antioxidants are applied ...  
JPH04138808A
PURPOSE: To prevent the generation of the surface flaw of tube due to grain boundary oxidation when heating a billet by preheating the billet on the preceding stage of heating the billet and making the billet into a tube and applying ant...  
JPH04138806A
PURPOSE: To prevent selective oxidation when heating a billet and in its turn to prevent the generation of the pressed flaw of oxidized scale on the surface of tube by rolling the billet as it is without repairing when the number of surf...  
JPH04135004A
PURPOSE: To prevent flaw on the inside and outside faces, angularity and end clogging and to execute high-accuracy rolling by confining the wall thickness/outside diameter ratio of tube stock and the shapes of inclined rolls and plug and...  
JPH04135001A
PURPOSE: To manufacture a base stock for high alloy seamless steel tube with high yield by specifying the cross section of the base stock and its rolling quantity when a round billet for seamless steel tube is manufactured from a cast bl...  
JPH04135002A
PURPOSE: To completely pierce without causing end clogging and defective piercing by piercing while pushing the rear end of base stock again with a pusher just before the end of piercing. CONSTITUTION: Just before the end of piercing, th...  
JPH04135005A
PURPOSE: To roll a tube without generating excess shearing strain in a shell by inclining the roll axis of a conical roll of a two roll type skew rolling mill at a prescribed angle to the pass center, crossing and approximately fixing th...  

Matches 651 - 700 out of 1,208