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Patent Searching and Data


Matches 251 - 300 out of 2,130

Document Document Title
JP4487847B2  
JP2010125492A
To provide a piercing rolling method for a billet by which the occurrence of scratches on the inner surface at a distal end part of a seamless steel tube is prevented advantageously. In the piercing rolling method for a billet performing...  
JP2010125493A
To provide a piercing rolling method for a billet by which the occurrence of scratches on the inner surface at a distal end part of a seamless steel tube is prevented advantageously. In the piercing rolling method for a billet performing...  
JP2010125494A
To provide a piercing rolling method for a billet by which scratches on the inner surface at a distal end part of a material to be rolled hardly occurs in piercing rolling a billet (seamless steel tube base stock) by means of a piercer s...  
JP4475429B2
A Ni base alloy pipe stock having a chemical composition comprising, by mass %, C ‰ 0.04%, Si €  
JP4471134B2  
JP4462265B2  
JP4453278B2  
JP4453082B2  
JP4449908B2  
JP4438960B2  
JP2010005679A
To provide the top shape of a punch in which the point angle of the punch of a centering punch device in an Assel mill and the point angle of a reproducing plug are taken as within the same range.In a clamping device for clamping the nos...  
JP4371247B2  
JP4359783B2  
JP4356168B2  
JP4352997B2  
JP2009241075A
To provide a manufacturing method for a high-alloy seamless steel pipe, which inhibits fin flaws generated in manufacturing a high-alloy seamless steel pipe by piercing.A high-alloy steel billet heated to a temperature range of 900-1,250...  
JPWO2009122620A
A hole (30) is formed in the central part of the rear end face (20) of a round billet (10). A hole (30) has the predetermined depth from a rear end face (20), and has a plurality of slots (31) on the side. Each slot (31) extends in a dep...  
JPWO2009119245A
It is the method of carrying out punching rolling of the piece of a round bar heated at 1250 ℃ or less by ピアサ which allotted the plug along with the pass line between a pair of inclination rolls by which countering allocation was...  
JP4337504B2  
JP4314458B2  
JP4315155B2  
JP4315154B2  
JP4311403B2  
JP4305673B2  
JP4305573B1
A hole (30) is formed in the central part of the back end side (20) of a round billet (10). A hole (30) has the predetermined depth from a back end side (20), and has two or more slots (31) on the side. Each slot (31) extends in the dept...  
JP4301133B2  
JP4279350B1
The plug for punching rolling is Fe by carrying out electric arc spraying of the iron wire rod which makes Fe the main ingredients on the surface of base metal. 3 O 4 Since the tunic which consists of an oxide and Fe (s) (metal), such as...  
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
The present invention with 2 roll inclination rolling mill equipped with the punching mandrel currently held between the rolls inclined while having and carrying out one rolling part and at least one reeling part, With 3 roll inclination...  
JPWO2008142803A
[Subject] Even if the degree delta of skew angle is enlarged and it raises an expansion ratio, a punching rolling method and a device of a joint non-pipe which can prevent generating of peeling of material are provided. [Means for Soluti...  
JPWO2008126427A
Boring machine 10 is provided with the following. A plurality of inclination rolls 1, Plug 2, Pusher 4, Guide roll 6. Pusher 4 pushes round billet 20 from the back end after round billet 20 contacts inclination roll 1 at least until it m...  
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  
JPWO2008096708A
The plug material of predetermined shape is prepared, the prepared above-mentioned plug material is heat-treated in the heat treatment atmosphere containing oxygen beyond 1.0vol% with 950 ℃ or more the heat treatment temperature below ...  
JP2008531286A
The present invention is a method for supervising the processing process for manufacturing a hot-working pipe, and relates to that by which a hollow matter pipe is manufactured with an inclination boring machine using the internal tool c...  
JP4133103B2  

Matches 251 - 300 out of 2,130