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WO/2000/064606A1 |
The objective of the invention is, in the forming of a cylindrical pipe (60) into an angular pipe (70), to manufacture an angular pipe (70) in small volumes and with high efficiency correspondent to the variety of angular pipes demanded....
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WO/2000/051776A1 |
A process for the high speed joining of opposed metal surfaces where the process includes the step of utilising the heat energy retained in the metal to fuse the surfaces together. The invention also extends to a hollow bar formed accord...
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WO/2000/012237A1 |
The invention relates to a method for minimizing thickened ends during the rolling of pipes in a stretch reducing mill. To this end the torque of individually driven mill stands is temporarily modified when the front and back ends of the...
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WO/1999/047284A1 |
The invention relates to a mill for rolling pipes or other bodies such as flat blooms, bars, rods and the like. The rolling mill is formed by an outer load-bearing structure in which holders are accommodated so as to be extractable there...
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WO/1999/033588A1 |
The method relates to a method for descaling the inside of the preliminary pipe during rolling in a plug rolling mill. According to said method, to remove the scale pressurized water, which is emitted through nozzles in the direction of ...
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WO/1999/007491A1 |
The invention relates to a method for producing welded Cu and Cu alloy pipes in a combined production line, comprising a casting installation for ingoing materials, a hot-rolling mill, a pipe forming and welding installation and a drawin...
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WO/1998/055243A1 |
The invention relates to a method and a device for detecting the actual state of a hot tube, wherein wall thickness, diameter, temperature and discharge speed from a sizing and stretch reduction rolling mill pertaining to a tube rolling ...
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WO/1998/006515A1 |
The invention relates to a rolling mill for sizing tubes or cylindrical bodies such as bars, rods and so on, and is intended for the iron and steel industry. The rolling mill is made up of a multiplicity of fixed three-roll rolling units...
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WO/1998/001589A1 |
The invention relates to a process for producing weldless steel pipes by hot-rolling of a round block in a plurality of stages. During said process, said round block consisting of interstitial-free (IF) steel is inserted and heated in a ...
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WO/1997/039843A1 |
A method of producing seamless steel pipes of excellent performance efficiently by an on-line system, and seamless steel pipe manufacturing equipment in which the apparatuses used from a casting step to a heat treatment step are provided...
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WO/1997/019767A1 |
A rolling mill for rolling pipes on a mandrel (40) is formed by an alignment of rolling units according to the invention; each rolling unit comprises an outer annular structure (2) formed by at least two plate-shaped elements (3) connect...
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WO/1997/013595A2 |
The disclosure concerns a calibre contour in the substantially circular rollers of a reduction roller mill with three-high stands, intended in particular for use in rolling thick-walled tubes with wall thickness/diameter ratio which is g...
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WO/1997/007906A1 |
A process for reducing a raw steel pipe obtained by a solid phase bonding pipe manufacturing method or a welding pipe manufacturing method is carried out by heating the steel pipe to a temperature in excess of 100 �C and lower than 800...
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WO/1996/025249A1 |
The invention concerns a roll pass design system for the three-roll sets in a multi-stand mandrel-less pipe-reducing rolling mill. In order to improve the roll design so that the flow of material in the pipe is locally influenced such th...
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WO/1996/020808A1 |
A method is disclosed for producing heat exchanger tubing for use in tube and shell heat exchangers having improved heat exchange and improved fluid flow around the heat exchange tubes in which cylindrical tubing is deformed by pressure ...
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WO/1995/034387A1 |
The invention concerns a method for the production of a seamless hot-finished tube from steel with reduced deformability, in particular roller-bearing steel, the method calling for a pretreated and degassed as well as deoxidized liquid s...
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WO/1993/020960A1 |
A rolling stand (5) comprises at least three driven rolls (27, 28, 29), having their axes (A1, A2, A3) of rotation which are concurrent one another and lie in a plane perpendicular to a rolling axis along which the rolling stand is locat...
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WO/1992/010316A1 |
The invention concerns a method for the automatic monitoring of continuous tube rolling mills, in which parameters governing the rolling process are measured and compared with predetermined reference values to produce process-control sig...
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WO/1991/001824A1 |
The device comprises a roller for longitudinally rolling a hollow blank (12). The roller comprises four rolling stands (1, 2, 3, 4), the first stand comprising two round-grooved cylinders (7, 8), the other three stands comprising four dr...
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WO/1990/014900A1 |
The drilling roller/press comprises five working cylinders (o) for producing round, hollow bodies from five-sided billets (B).
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WO/1990/010508A1 |
The roller of the invention is designed in particular for rolling mills and metallurgical plants. The roller body has an axial bore passing through it, and a spindle with several stepped sections. The roller body is held by force against...
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JP7461088B1 |
The present invention provides a composite device and method for suppressing imbalance, dust, cracks, etc. when forming a composite thin-walled tube made of dissimilar metals. [Solution] In particular, a composite device and method for p...
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JP7440741B2 |
To provide a steel pipe for a line pipe capable of using under a low temperature condition (-40°C to -80°C), and excellent in welded part toughness.The electro-seamed steel pipe for a line pipe has a predetermined chemical composition,...
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JP2024000976A |
An object of the present invention is to provide an inclined rolling method and a seamless steel pipe manufacturing method that suppress external surface flaws due to surface defects of a rolled material. [Solution] An inclined rolling m...
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JP2024000439A |
[Object] To provide a seamless steel pipe that has high strength and excellent HAZ toughness after circumferential welding. A seamless steel pipe according to the present disclosure has a chemical composition described in the specificati...
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JP2024000440A |
[Object] To provide a seamless steel pipe that has high strength and excellent HAZ toughness after circumferential welding. [Solution] A seamless steel pipe according to the present disclosure has a chemical composition described in the ...
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JP2024000438A |
The present invention provides a seamless steel pipe having high strength and excellent low-temperature toughness. A seamless steel pipe according to the present disclosure has a chemical composition described in the specification and a ...
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JP2023537408A |
Apparatus for handling a mandrel rod (3) in a rolling plant (1) equipped with a rolling mill (20) for rolling a seamless tube (2'), the apparatus (10) being installed in a rolling line (L). A pusher (11) configured to move the arranged m...
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JP7294228B2 |
To provide a rolling support model generation method by which an element pipe with suppressed deterioration of wall thickness characteristics can be obtained after rolling even if conditions of a grooved roll and a mandrel bar change for...
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JP7268252B2 |
A method for rapidly measuring roller pass major semi-axis of three-roller reducing mill, the method comprising the following steps: selecting a corresponding value of the average diameter of an elliptical pass, a value of a first major ...
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JP7184109B2 |
To provide a rolling control method for a seamless steel pipe and a manufacturing method that can manufacture a seamless steel pipe having both good outer diameter dimension accuracy and circularity even when a hole-type roll is abraded ...
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JP7106004B2 |
The invention discloses a small-aperture thick-wall metal tube and a preparation method thereof. The cross-sectional diameter of the metal tube ranges from 30mm to 160mm, the dimensional accuracy is ±0.2mm, and the ratio of the outer di...
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JP7051904B2 |
Disclosed is a method for the production of a valve body of a hollow chamber valve, said method comprising: providing a bowl-shaped semi-finished product having an annular wall, which surrounds a hollow chamber, and a bottom portion, fol...
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JP6939900B2 |
A piercing machine is provided that can suppress a temperature difference between a fore end portion and a rear end portion of a hollow shell after piercing-rolling or after elongating rolling. A mandrel bar (3) of a piercing machine inc...
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JP6881109B2 |
To provide a method and a device by which a length of a long material in a hot state can be measured with a good accuracy even if a temperature at a length measurement time changes relatively largely.This method includes: a process in wh...
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JP6879110B2 |
To provide a steel pipe allowing for suppression of inner surface crack and bending thereof after undergoing hot diameter-reducing rolling, and a method of producing the same.The steel pipe is provided that has a chemical composition con...
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JP6881165B2 |
To provide a manufacturing method of a seamless steel pipe of showing excellent lubricity in drawing-rolling time in a Cr-containing alloy steel and carbon steel in the present invention.A manufacturing method of a seamless steel pipe by...
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JP6801546B2 |
To provide a restriction rolling device capable of enhancing productivity of a metal pipe usable as underground water removal work use.A restriction rolling device by the present invention comprises one or a plurality of finishing stands...
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JP6741192B1 |
Provided is a method for manufacturing a seamless square steel pipe capable of obtaining a seamless square steel pipe having a corner S value equivalent to that of the conventional one while reducing the equipment load. A method for manu...
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JP6737321B2 |
To provide a manufacturing method for a seamless steel pipe capable of obtaining the seamless steel pipe excellent in outer surface quality by preventing occurrence of an external flaw.A manufacturing method for a seamless steel pipe usi...
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JP6641985B2 |
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JP6627825B2 |
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JP6623211B2 |
A method for producing hot-rolled, seamless pipes having at least one wall thickening which can be arranged at any positions over the length of the pipe, wherein by means of a multiple-stand mandrel bar rolling mill, the rolls roll a hol...
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JP6572774B2 |
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JP6561909B2 |
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JP2019086334A |
To provide a device with which it is possible to measure the state of a pair of grooved rolls, which is useful information for suppressing the thickness deviation of a pipe in a mandrel mill, stably with high accuracy during the drawing/...
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JP6388566B2 |
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JP6197783B2 |
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JP6179408B2 |
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JP2017522191A |
The present invention relates to a compact plant (10) for rolling seamless pipes. The plant is a rotary drilling machine (20) with rolling shaft XPRA rotary drilling machine (20) designed to drill a piece of steel (11) pressed against a ...
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