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Matches 251 - 300 out of 2,084

Document Document Title
JP4305673B2  
JP4305573B1  
JP4301133B2  
JP4279350B1  
JP2009125784A
To provide a hump capable of reducing an undulation formed on the outside surface of a product by changing the chamfered shape of the rear end part of a roll for an Assel mill.In a roll for an Assel mill, a hump of the roll prevents gene...  
JP4276480B2  
JP4259347B2  
JP2009082988A
To provide a pierced tube shell of an austenitic stainless steel having a good inner surface condition and to establish a means with which can perform mass production on an industrial scale of a good quality seamless steel pipe of stainl...  
JP4255991B2  
JP2009066644A
To provide a piercer boring method of a hard-to-work material capable of preventing generation of inner flaw when performing the piercer boring of the hard-to-work material.In the piercer boring method for manufacturing a seamless steel ...  
JP4238744B2  
JP4231631B2  
JP2009018338A
To provide a pusher device with which thickness deviation in the top part of a tube stock manufactured by pusher piercing is suppressed.The pusher device 4 is provided with a cylinder device 30 and a pusher mandrel 34. The cylinder devic...  
JP4200829B2  
JP4196991B2  
JP2008543569A  
JP4169858B2  
JP4155267B2  
JP2008214713A
To provide a billet which suppresses the generation of an intermetallic compound entailing the deterioration of toughness and corrosion resistance and a seamless steel tube using the billet.There are provided the billet for the seamless ...  
JP4150585B2  
JP4145764B2  
JP2008531286A  
JP4133103B2  
JP4126979B2  
JP2008161912A
To provide a method of manufacturing seamless steel tubes by which the deterioration of surface roughening is deterred without damaging the biting property of barrel-shaped rolling rolls.This method of manufacturing the seamless tubes is...  
JP2008161906A
To provide a method for producing a seamless steel pipe made of a high Cr-high Ni-based alloy in which the generation of melted inside rash is prevented, and also, the service life of a plug can be improved.When the stock to be rolled ma...  
JP2008161900A
To provide a method of manufacturing a medium-diameter seamless steel pipe by which occurrence of eccentric uneven-thickness defect is detected on the spot during the piercer rolling of the same pipe-making lot in which the thickness of ...  
JP4117955B2  
JP4107199B2  
JP2008137026A
To provide a barreled rolling roll for inclined rolling mill and a method for manufacturing a seamless steel pipe, capable of relaxing the generation of a flaw caused by a knurling.The barreled rolling roll provided with the ball head re...  
JP4103082B2  
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...  
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 ...  
JP2007526133A  
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 ...  
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,...  
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 ...  
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...  

Matches 251 - 300 out of 2,084