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Matches 251 - 300 out of 1,579

Document Document Title
JP4916498B2
A pierced shell of an austenitic stainless steel having a good inner surface condition is provided, and a means is established which can perform mass production on an industrial scale of a good quality seamless steel pipe of stainless st...  
JP4893858B2
In cold rolling of a seamless metallic tube with a cold pilger mill, when a reduction ratio of an outside diameter becomes excessive in comparison to a reduction ratio of a wall thickness, strain in a circumferential direction on flange ...  
JP2011255394A
To provide an Assel mill roll with which the generation of thickness deviation is suppressed while securing a necessary thickness rolling reduction of a hollow tube stock.In the Assel mill roll 1 on which a first circumferential surface ...  
JP4826949B2
It is an object of the present invention to provide a monitoring apparatus and the like of seamless pipe or tube production conditions which enable to quickly correct production conditions during operating the manufacturing facilities of...  
JP2011212734A
To provide a seamless tube manufacturing method which can advantageously suppress the occurrence of internal flaw in a piercing-rolling process.A plug before use is heated or cooled so that the temperature of the plug just before piercin...  
JP4798220B2
A billet is provided on a pass line between a pusher and a plug, and the billet is advanced and caught between a plurality of inclined rolls. At least between when said caught billet contacts said plug and when the piercing and rolling r...  
JP4780192B2  
JP4780107B2
A plug 2 used for a piercer according to the invention includes a tip end portion 23, a cylindrical portion 24, a barrel portion 25, a mandrel coupling portion 22, and an injection hole 21. The injection hole 21 penetrates from the surfa...  
JP4734724B2  
JP4725174B2  
JP4704798B2  
JP2011115851A
To provide a method of manufacturing a seamless steel pipe, by which a material temperature (working temperature) when piercing a material to be worked is not in ununiformity in the longitudinal direction and the generation of internal d...  
JP2011115816A
To provide a method for coating a lubricant capable of simplifying configuration of a device used in coating and of suppressing time required for drying in a path for supplying a plug to a piercing mill, and also to provide an equipment ...  
JP4702364B2  
JP4692511B2  
JP4687182B2  
JP4682432B2  
JP4661869B2
A plug has a tip end portion, a taper portion, and a middle portion. The surface of the tip end portion is a spherical surface whose radius of curvature is R1 and length is L1 that is shorter than R1. The outer diameter of the taper port...  
JP4655768B2  
JP4650747B2  
JP4624514B2
Two-roll piercing mill has side guide tools with working surfaces of a high hot strength material which does not stick to high alloy steel. Independent claims are also included for the following: (i) a two-roll piercing mill with monolit...  
JP4623212B2
[Objective] To provide a method and apparatus for seamless tubes in which the occurrence of material peeling can be prevented even when the skew angle ´ and tube expansion ratio are increased. [Means for solution] A piercing-rolling met...  
JP4617602B2  
JP4615432B2  
JP4610555B2
Apparatus for reducing the diameter, rounding or straightening of pipe or tubing by rolling comprising a plurality of cylindrical rollers arranged in a parallel-cylindrical array through which the pipe or tubing is passed, the rollers be...  
JP4609372B2  
JP4603707B2  
JP4597695B2
The present invention provide a two-component anti-seizure agent for hot metal working process comprising the first aqueous solution and the second aqueous solution, wherein the first aqueous solution contains 10~30 mass % of sodium sili...  
JP4586921B2
A high quality hollow shell in which the occurrence of internal surface flaws caused by the rotary forging effect and/or shear deformation is prevented by suppressing the rotary forging frequency and shear deformation in a transient regi...  
JP4569317B2  
JP4543684B2  
JP4538917B2  
JP4517811B2  
JP4513807B2
An Fe-Ni alloy pipe stock having a chemical composition comprising, by mass %, C ‰¤ 0.04%, Si ‰¤ 0.50%, Mn: 0.01 to 6.0%, P ‰¤ 0.03%, S ‰¤ 0.01%, Cr: 20 to 30%, Ni: 30 to 45%, Mo: 0 to 10%, W: 0 to 20%, with Mo(%) + 0.5W(%): ...  
JP4506563B2  
JP2010521317A
The invention relates to a rolling mill for rolling stock to be rolled (6), having a planetary cross-rolling mill (20) and a subsequent further rolling mill in the rolling direction, the subsequent mill comprising a mandrel rod (10) havi...  
JP4487847B2  
JP4475429B2
A Ni base alloy pipe stock having a chemical composition comprising, by mass %, C ‰ 0.04%, Si €  
JP4471134B2
Disclosed is a method for producing a seamless pipe by using a piercing mill which pierces and rolls a round billet heated to 1300°C or lower, wherein the piercing mill is composed of a pair of skew rolls disposed to face each other acr...  
JP4462265B2
The present invention provides a seamless tube piercing/rolling plug and a seamless tube producing method in which piercing/rolling is performed with an inclined rotary piercing mill while the seamless tube piercing/rolling plug is used ...  
JP4453278B2  
JP4453082B2  
JP4449908B2
The present invention provides a system for supplying a lubricant necessary for efficiently manufacturing high-quality seamless pipes or tubes in a piercing mill, an apparatus for manufacturing seamless pipes or tubes having the supply s...  
JP4438960B2
A method for manufacturing a seamless pipe, capable of preventing the carburization phenomenon that occurs in a manufacturing process of pipe and simplifying an elongation rolling process, is provided. In this method, after piercing in t...  
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
Pipe-swelling can be prevented by piercing-rolling a high-alloy steel billet heated to a temperature range from 900 to 1250°C with a piercing mill equipped with main rolls having a surface roughness R max of 150 to 500 µm. A ratio (the...  
JP4359783B2
A round billet containing, by mass%, 10.50 to 14.00% of Cr with a value represented by the equation of "Cr + 4Si - (22C + 0.5Mn + 1.5Ni + 30N)" of not more than 9.0%, wherein the symbols of the elements represent the contents, by mass%, ...  
JP4356168B2  
JP4352997B2  
JP4337504B2  

Matches 251 - 300 out of 1,579