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Patent Searching and Data


Matches 351 - 400 out of 2,059

Document Document Title
JP3425718B2
To provide a manufacturing method of a seamless tube to effectively suppress generation of flaws on an inner surface without generating any defective bite in the Mannesmann pushing and boring method using a material such as free-cutting ...  
JP2003112208A
To provide a device and method for rolling a steel tube which are excellent in not only tube polishing but also tube expanding capability without slowing down rolling speed than that in the conventional manner.In the rolling device for t...  
JP3411704B2
PURPOSE: To change a plug at the stage when the life of the plug is expired without monitoring the damaged state by measuring the surface temp. at the tip of the plug after rolling and before cooling and changing the plug at the point of...  
JP3407704B2
To prevent a generation of defects on the inside surface without lowering productivity even when a seamless steel tube consisting of high carbon steel is manufactured. This method is provided for manufacturing the high carbon steel seaml...  
JP3405265B2
To secure workability and to prevent the generation of internal flaws at the time of executing Mannesmann piercing of high carbon steel. A billet which is made by continuously casting the high-carbon steel containing, by weight, 0.60 to ...  
JP3402175B2
To enlarge the possible manufactural length of a seamless steel tube. In the boring method of the seamless steel tube by an inclined roll, a boring plug 2 is arranged so that the maximum diameter part 2a is positioned in a gorge part 1b ...  
JP3402268B2
To perform a stable pierce rolling by adjusting a disc roll slanting angle in a way that an outer diameter of a hollow pipe coincides with a target value while installing a disc roll slantable against a pass line and movable in a pass li...  
JP3402988B2
To suppress incorrect follow-up of a cam follower with respect to a tubular cam while enhancing durability through a simple structure by constructing means for urging one cam follower toward the tubular cam side of a leaf spring. Under a...  
JP2003053403A
To suppress external flaws occurring from the difference in level of a base stock as a starting point even in the case a seamless tube is manufactured by using a hard-to-work material the chromium content of which is ≥4.5 mass%. In the...  
JP3400272B2
To prevent generation of defects such as crack in the end part of a tube stock and the like due to δ ferrite at the time of piercing rolling of cast billet for seamless tube with a piercer by rolling billet under satisfying specified co...  
JP3401434B2
To prevent the inner face of a tube to be rolled from generating a crack by making a Q value and T. Red a specific value so that tensile stress generated at a Pilger rolling time is crossed to metal fibers by using a base tube is which t...  
JP3367746B2  
JP3369320B2  
JP3369297B2  
JP3369241B2  
JP3367332B2  
JP2003001305A
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 ...  
JP3361375B2  
JP2002361304A
To provide a method for manufacturing a seamless steel tube using a round billet capable of suppressing inner face flaws that occur at the time of piercing a RCC stock with a skew rolling. 1. The round billet as continuously cast, especi...  
JP2002361384A
To provide a manufacturing method for a seamless steel pipe excellent in an inner surface and inner quality property. A round billet, which is formed into a round billet by hot rolling a slab made by continuous casting, and whose segrega...  
JP2002339038A
To produce low-alloyed high strength steel for a seamless tube for oil well or gas well, which has excellent fracture strength and sulfide stress corrosion cracking resistance in a mild acidic environment, and satisfies the yield strengt...  
JP3348664B2  
JP2002331301A
To provide an inclined drilling rolling method capable of manufacturing a seamless steel tube having less deflective wall thickness and no internal flaw at high rolling efficiency.In the inclined drilling rolling method using two or more...  
JP2002327234A
To provide a round billet for a seamless steel tube which can be drilled in a continuously as-cast state, and a drilled seamless steel tube thereof.The round billet for the seamless steel tube includes, by mass%, 0.05-0.55% C, 0.1-0.4% S...  
JP2002537486A  
JP2002316201A
To provide a planetary skew rolling method by which its various problems are eliminated by at least partially preventing temperature rising to the recrystallization temperature when performing deformation process.In the method for manufa...  
JP2002301504A
To provide a manufacturing method of a seamless metallic tube by which the defective biting of a billet in a piercer is suppressed.When a mill scale material is used as a round billet, the major axis (a) and the minor axis (b) in a regio...  
JP2002282906A
To achieve an improvement in the uniformity of pipe wall thickness and stabilization of piercing rolling in a piercer mill to be utilized in the first process for manufacturing a seamless steel pipe.A method comprises a process in which ...  
JP2002282908A
To achieve an improvement in the uniformity of pipe wall thickness in a piercer mill to be utilized in the first process for manufacturing a seamless steel pipe.A piercer mill guide comprises a guide shoe provided with an opening for mak...  
JP2002282907A
To achieve an improvement in the uniformity of pipe wall thickness in a piercer mill to be utilized in the first process for manufacturing a seamless steel pipe.A piercer mill guide is configured and that a guiding unit, comprising a gui...  
JP2002273505A
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 scale...  
JP2002248506A
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 rolling...  
JP3319428B2  
JP2002239613A
To provide a method for manufacturing a seamless tube made of high-alloy steel being a heavy-load material at a low cost with a manufacturing line for seamless tubes using an inclined piercing mill.After a base stock is machined into the...  
JP2002239612A
To provide a method for manufacturing a seamless tube made of high-alloy steel being a heavy-load material at a low cost with a manufacturing line for seamless tubes using an inclined piercing mill.In the seamless tube manufacturing line...  
JP2002224712A
To provide multiple-hump rolls for Asser mills solving problems about a reduction in rolling efficiency, a variation in wall thickness, etc., due to an insufficient bulge of shells after rolling and difficulty for pulling out mandrels at...  
JP2002224711A
To provide a manufacturing method of seamless pipes excellent in properties of the inner wall and the internal body.Circular billets hot-rolled from slabs made at continuous casters whose segregation displacement ratio P(%) is 5 to 40% a...  
JP2002210508A
To provide a radius shape in the body part of a plug for reducing flaws on the inside surface of a steel tube when manufacturing a seamless steel tube by Mannesmann process and a manufacturing method for the seamless steel tube using the...  
JP2002210507A
To provide a piercing method for a seamless steel tube.In a method for piercing the seamless steel tube, in this piercing method of the seamless steel tube, by working the tip part of a billet into a taper shape and working the shape of ...  
JP3304963B2  
JP2002192229A
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 t...  
JP3309807B2
To provide a size-free rolling method of metallic materials in which the finished cross-sectional shape in the outer peripheral part is approximately complete roundness, the uneven diameter difference is extremely small and the cross-sec...  
JP3307294B2
To provide the method and device for manufacturing a seamless steel tube made of an Fe-base alloy whose Cr content is <15 wt.%, which are immediately applicable to existing manufacturing equipment by which a product steel tube reduced in...  
JP3305604B2
To prevent generation of inside surface scratch of steel tube and to manufacture seamless tube with excellent inside surface skin by manufacturing a rolling stock for seamless tube of specified shape and then piercing rolling the rolling...  
JP3297994B2
To obtain a rolling mill to cope with the production of small quantities in many kinds of seamless steel tubes sized from a small diameter to a large diameter by providing a means of turning a cannon holder and making it travel along a p...  
JP2002113507A
To provide a plug for piercing a seamless steel tube which has a long life even in rolling of high-allow steel such as stainless steel and a Ni-base alloy and with which a tube excellent in the properties of the inside surface because of...  
JP2002102906A
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...  
JP2002102924A
To provide a method for detecting a plug dropout which requires no more measures to protect the environment preventing fumes and dust than before without imparting physically bad influences to workers and capable of preventing damage to ...  
JP2002103002A
To provide a method for producing a cast billet having little porosity without applying rolling reduction to the cast billet after casting, and a method for producing a seamless steel tube having little internal flaw by using the round c...  
JP2002096105A
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 m...  

Matches 351 - 400 out of 2,059