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Matches 251 - 300 out of 2,055

Document Document Title
JP2008126255A
To provide the technique of manufacturing a seamless tube excellent in quality at high productivity.Piercing and rolling are performed by using a piercing mill provided with inclined rolls under conditions that the reduction ratio TDFT a...  
JP4094462B2  
JP2008062294A
To provide a monitoring apparatus etc. of manufacturing conditions for seamless pipes which enables quick correction of manufacturing conditions during operation of seamless pipe manufacturing equipment.The manufacturing condition monito...  
JP4059099B2  
JP4051918B2  
JP4045813B2  
JP2007537874A  
JP2007290020A
To provide a method of manufacturing a medium diameter seamless pipe by which eccentric uneven thickness of the rolled stock succeeding to a detected rolled stock is reduced by detecting the generation of the eccentric uneven thickness o...  
JP4000738B2  
JP2007260685A
To provide a piercer plug and a piercing and rolling method by which the life of the piercer plug is lengthened and also the occurrence of slip or miss roll during piercing and rolling is prevented. In this piercer plug 3, the coefficien...  
JP2007526133A  
JP2007229795A
To provide barrel-shaped piercer rolls with which shearing strain in the circumferential direction is reduced. In these barrel-shaped piercer rolls for reducing shearing strain in the circumferential direction, when piercing a billet by ...  
JP2007222946A
To improve thickness deviation which is generated due to a fluctuation in piercing efficiency. In a control method for rolling a seamless tube, rolling of the tube is performed while opening and closing bar steadiers provided at an outle...  
JP2007160331A
To provide a barrel type piercer roll for preventing occurrence of any inner surface flaw.In piercing a hole in a billet by using a barrel type piercer roll, in the barrel type piercer roll for preventing the occurrence of any inner surf...  
JP3959667B2
To manufacture a high-strength steel pipe which restrains inner flaws from being caused and which is excellent in resistance to sulfide, stress and corrosion cracking. Seemless pipes are manufactured by the direct hot rolling of billets ...  
JP3921809B2
To provide a method of manufacturing a martensitic stainless steel tube having high strength of which the yield stress exceeds 650 MPa and also having excellent toughness at a low temperature. After martensitic stainless steel which has ...  
JP3921808B2
To provide a method for producing a martensitic stainless steel tube having high strength of >650 MPa yield stress and having excellent low temp. toughness. Martensitic stainless steel having a compsn. contg., by weight, 0.15 to 0.22% C,...  
JP2006341299A
To provide a method of manufacturing ultra thin wall metallic tube by a cold stretching method by which the manufacturable range of the thin wall side of a seamless metallic pipe or a welded metallic pipe can be greatly expanded.This met...  
JP2006326652A
To provide a manufacturing method of a very thin wall seamless metal pipe by a cold-rolling process using an inclined rolling method, which manufacturing method can remarkably extend the manufacturable range of the seamless metal pipe to...  
JP2006315054A
To propose a push bench mill adopting a rotary roller die and also to propose a tandem rolling method using an inclined rolling mill.In a hot-manufacturing process of a seamless metallic tube adopting the push bench mill as an elongator,...  
JP2006297400A
To provide a piercing method in the manufacture of a seamless steel tube having no flaw on the inner and outer surfaces.In the piercing method of the seamless steel tube in a manufacturing method of the seamless steel tube, the generatio...  
JP2006297457A
To provide a method for measuring the outside diameter of a seamless steel tube capable of obtaining the highly reliable measurement value even when the temperature at the measurement is changed.In the method for measuring the outside di...  
JP2006297428A
To provide a reeler plug having high durability and satisfying the quality at the inside face of the material to be rolled in a tube polishing stage according to a Mannesmann plug mill rolling process as one of seamless steel tube produc...  
JP2006281283A
To provide an Assel mill rolling method for preventing the generation of thickness deviation in a steel tube.In this Assel mill rolling method for preventing the generation of the thickness deviation of the steel tube, the thickness devi...  
JP2006272371A
To provide a manufacturing method and a manufacturing apparatus of a seamless tube in which the balance of the necessary and sufficient cooling of main rolls and the quantity of an antiseize agent remained on the surface of disk rolls or...  
JP3855300B2
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 ...  
JP2006231354A
To provide a method of manufacturing an ultra thin-walled seamless tube by which a hot manufactured seamless metallic tube is used as a tube stock and the manufacturable range on the thin-wall side of the metallic tube can be radically e...  
JP2006219556A
To obtain a two-pack type anti-seizing agent for hot plastic working, in which since an anti-seizing agent applied to a disk roll type guide shoe is not made to flow by cooling water of a roll, the anti-seizing agent is supplied and reta...  
JP2006181596A
To provide a method for piercing a piercer by which the internal surface flaws of a shell after piercing can be suppressed.In this method, the conditions of the piercer are set so that the number N of rotary forging which is defined by t...  
JP3823762B2
To provide a production method for a seamless steel pipe which controls Mannesmann destruction and circumferential shearing strain and produces a product having less inner roll marks with a high productivity. A plug as shown in Fig. 3 is...  
JP3820896B2
To provide an inclined rolling machine for a seamless pipe and a rolling method thereof by which the baking of a disc roll comprising the inclined rolling machine can be suppressed, and the fault of a guide mark can be reduced. In rollin...  
JP2006116584A
To provide a manufacturing method of a seamless steel tube by Mannesmann piercing process by which thickness deviation and deterioration of biting ability are prevented and the generation of inside surface flaws is decreased in the manuf...  
JP2006110590A
To provide a method for manufacturing a seamless steel tube by which the seamless steel tube where occurrence of inner surface defects is reduced is manufactured, even when performing piercing rolling by using high Cr-containing steel or...  
JP2006095565A
To provide a method for continuously casting a large diameter cast billet with which crack in the axial center part of the cast billet can be reduced, and a method for making a pipe with which even in the case of piercing-rolling the rou...  
JP3785916B2
To provide a method for rolling a seamless steel pipe capable of suppressing the generation of non-uniform thickness, and rolling high quality hollow pipes in the method which performs, holding a hollow pipe with a holding device, a roll...  
JP3785930B2
To accurately detect the generation of end-blocking deemed undetectable. A device for detecting a slip is provided with: a detecting means 14 for a driving torque current of the main roll of a piercer, a detecting means 18 for a driving ...  
JP3777997B2
To provide a manufacturing method of a seamless steel tube which is excellent in quality of internal surface. This method is a method for manufacturing the seamless tube by piercing a billet by using a plug on the surface of which a scal...  
JP2005334964A
To provide a method for producing a seamless steel tube in which the generation of inside flaws can be suppressed.A columnar steel having an old austenite intergranular structure comprising ferrite or ferrite and pearlite and an old aust...  
JP3738660B2
To provide a martensitic seamless stainless steel pipe whose surface is provided with scale excellent in adhesion and to provide its producing method. This martensitic seamless stainless steel pipe contains, by mass, 0.2 to 0.5% Ni and 9...  
JP2005246416A
To coincide the center of a mill stand with the center of a rolling roll about all inner housing in a pipe mill for producing many kinds.This method is a mounting method of an inner housing in a three-roll type pipe mill. When expressing...  
JP2005232539A
To provide a non-heat-treated seamless steel pipe which balances high strength with high toughness without being heat-treated, and further secures adequate weldability.The non-heat-treated seamless steel pipe comprises, by mass%, 0.10-0....  
JP2005211911A
To provide a method for preventing the end crack of a seamless steel pipe in straightening the steel pipe.The method for preventing the end crack in straightening the steel pipe performs roll straightening by heating the steel pipe end b...  
JP2005211973A
To provide a method for minimizing the inside surface flaws of a steel pipe obtained by regulating the relationship between the distribution form and amount of the porosities of a round steel billet which must be controlled by various fa...  
JP2005211920A
To lighten the load at boring time of a seamless steel pipe with skew rolling, by that linear segregation except the central part in a bloom with a continuous casting is lightened to form only the center segregation and easily perform th...  
JP2005211912A
To provide a method for preventing any uneven thickness of a seamless steel tube.In the uneven thickness preventive method of a seamless steel tube, the amplitude of a mandrel during the drilling is measured in a seamless steel tube manu...  
JP2005202803A
To provide a learning control method capable of preventing learning accuracy from deteriorating if errors are greatly changed by factors that change over time or if learning has not been fully achieved as manufacturing conditions vary gr...  
JP3692597B2
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...  
JP2005163167A
To provide a rotary hearth equipment in a seamless steel tube manufacturing line, and a seamless steel tube manufacturing method using the same.In the rotary hearth equipment in the seamless steel tube manufacturing line, a billet is lif...  
JP2005131688A
To provide a manufacturing method of seamless steel tube for a boiler and its piping, which does not cause a rolling defect on a product, even when a Mannesmann type skew rolling process is adopted.A material consisting of C:≤0.15 mass...  
JP2005111518A
To provide a method for manufacturing a seamless tube with a three-roll mandrel mill by which defective pulling-out of a mandrel bar after rolling and occurrence of scratches with the mandrel bar inside tubing are effectively suppressed ...  

Matches 251 - 300 out of 2,055