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Matches 351 - 400 out of 2,049

Document Document Title
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...  
JP3287045B2
PURPOSE: To reduce the thermal load of a rolling roll by effectively heating the ring material which is rolled between upper and lower rolling rolls. CONSTITUTION: A guide roll 9 which is brought into contact with a ring material 3 to be...  
JP2002066610A
To provide a manufacturing device for a seamless metal pipe comprising a main roll having excellent abrasion resistance without loss of slip resistance, and to provide an effective manufacturing method for the seamless metal pipe.The man...  
JP2002066611A
To provide a rolling method by use of a barrel-type skew rolling roll capable of enhancing a pipe-spreading rate of a material or a pipe material on rolling, even if a skew rolling mill comprising a barrel-type roll is employed to a manu...  
JP3282797B2
To automatically remove iron pieces stuck after burning to the outer peripheral surface of a roll without dismounting inclined rolls from the main body of the mill in the inclined roll mill provided with the inclined rolls which are arra...  
JP2002035810A
To provide a method for rolling seamless steel tubes by which a thin tube can be manufactured in the mandrel mill system by solving a perforation problem in the mandrel mill rolling, specifically, for example, to provide the method for r...  
JP2002035809A
To provide a method for rolling seamless steel tubes by which a thin tube can be manufactured in the mandrel mill system by solving a perforation problem in the mandrel mill rolling, specifically, for example, to provide a method for rol...  
JP2002035812A
To provide a method for rolling raw tubes for seamless steel tube manufacture by which rough tubes having an equivalent or better wall thickness distribution are obtained, compared with the ease where a fixed shoe is provided even if a P...  
JP2002035817A
To efficiently manufacture a seamless steel pipe whose finishing dimension is secured thanks to the continuously manufacturing line since deflected wall thickness in the circumferential direction is less and the thickness in the end of t...  
JP2002028704A
To improve the capacity of a planetary inclined rolling mill.The supply of a pipe shape 17 to be rolled to a roller nip is continuously performed in the state where its butt surface is abutted on the butt surface of the succeeding pipe s...  
JP2002001406A
To harmonize a rolling stand frame into power generated through the rolling process by simplifying fabrication, handling procedures and construction of a rolling stand frame.A module constructional rolling mill, in particular a rolling s...  
JP3239895B2  

Matches 351 - 400 out of 2,049