Sumitomo Metal Industries, Inc.

Nippon Steel & Sumitomo Metal Corporation

Nippon Steel Corporation

Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Kazuhiro Shimoda

Yuji Arai

Kenji Kondo

Tomio Yamakawa

Yasuyoshi Hidaka

Kouji Yamane

Yuji Inoue

Naoya Hirase

Yasuto Higashida

Hirokazu Okada

Hisashi Amaya

Sumio Iida

Keishi Matsumoto

Tetsuya Nakanishi

Kenji Takeuchi

Yuuji Tanaka

Kunio Kondo

Masaaki Igarashi

Takahisa Kato

Yoshihiko Hayashi

Chihiro Hayashi

Noriyoshi Nishiyama

Koichi Kuroda

Hiroyuki Semba

Akihiro Sakamoto

Akihiro Yamanaka

Kazutaka Asabe

Shinichiro Kawano

Masayuki Sagara

Toshiro Anraku

Kenichi Saitou

Shizuo Mori

Kouji Nakaike

Kazuyuki Murakami

Yohei Otome

Yasuji Echizen

Shuichi Akiyama

Hirofumi Hori

Koji Muramatsu

Shusuke Shimooka

Kouji Muramatsu

Haruka Obe

Masami Imamura

Yuichi Yamanari

Yosuke Tatebayashi

Yasuhiko Daimon

Takateru Inage

Junichi Nishimori

Masaharu Nakamori

Akira Motoki

Jyun Nagakita

Fumihito Yoshikawa

Takayuki Aisaka

Tsuneo Kondo

Hirotsugu Nakaike

Syusuke Shimooka

Toshiyuki Iwahori

Kota Shindo

Manabu Adachi

Yasuhiko Okuda

A method disclosed herewith is a method for producing a first seamless metal tube with a first wall thickness and a second seamless metal tube with a second wall thickness by using a three-roll-type inclined rolling mill, and the method includes a first inclination rolling step (#5), a setting changing step (#10), and a second inclination rolling step (#15). At the first inclination rolling step, a first workpiece is rolled by the inclined rolling mill. At the setting changing step, a setup condition of the inclined rolling mill is changed in a manner (a) or (b) as described below. At the second inclined rolling step, a second workpiece is rolled by the inclined rolling mill under the changed condition. (a) When the second wall thickness is smaller than the first wall thickness, the cross angle of each of the inclined rolls is made greater than the cross angle set for the first inclination rolling step. (b) When the second wall thickness is larger than the first wall thickness, the cross angle of each of the inclined rolls is made smaller than the cross angle set for the first inclination rolling step.

Method for producing seamless metal tube

The production method of a seamless steel pipe includes a heating step of heating an Nb-containing steel material to 800 to 1030&#xb0; C., a pipe-making step of producing a hollow shell by performing piercing-rolling or elongation-rolling on the Nb-containing steel material, by using a piercing mill including a plurality of skewed rolls, a plug disposed between the plurality of skewed rolls, and a mandrel bar, and a cooling step immediately after rolling, of carrying out cooling using a cooling liquid on a hollow shell portion that passes between rear ends of the plurality of skewed rolls, in the hollow shell, so as to reduce an outer surface temperature of the hollow shell portion to 700 to 1000&#xb0; C. within 15.0 seconds after the hollow shell portion passes between the rear ends of the plurality of skewed rolls.

Production method of seamless steel pipe

A method for producing a seamless metal pipe includes the steps of: preparing a billet having a diameter (B); heating the billet; forming, in a center part of a rear end of the heated billet, a hole including four grooves extending in an axial direction of the billet, the grooves each having a groove width (D) satisfying Formula (1), a groove height (H) satisfying Formula (2), and a groove depth (L) satisfying Formula (3); and subjecting the billet provided with the hole to piercing-rolling from a front end thereof by means of a piercing machine. By this means, the generation of burrs and internal defects at the rear end of a hollow shell after piercing-rolling can be suppressed.0.12&#x2264;&#x2264;0.25&#x2003;&#x2003;(1)0.10&#x2264;&#x2264;0.20&#x2003;&#x2003;(2)0.05&#x2264;1/&#x2264;0.10&#x2003;&#x2003;(3)

Method for producing seamless metal pipe

It is an objective to provide a plug capable of enhancing a usage count of the plug, which is for use in a piercing machine for piercing-rolling a billet, and a regenerating method of the plug. The plug () is for use in a piercing machine () for piercing-rolling a billet (). The plug () includes a body (), a columnar portion (), and a sprayed film (). The body () has a maximum diameter at its rear end. The columnar portion () has the same diameter as the diameter of the rear end of the body (), and extends from the rear end of the body (). The sprayed film () is formed on a surface of the body () and on a surface of the columnar portion ().

Method for regenerating a plug for use in a piercing machine

There is provided a piercing apparatus in which the occurrence of an inner surface flaw in a hollow shell is suppressed. A piercing apparatus () according to an embodiment of the present invention is the piercing apparatus () which pierces a billet (). The piercing apparatus () has a plug (). The plug () has a through hole (). The through hole () extends along the central axis, and allows the central portion of the billet () being pierced to pass therethrough.

Piercing apparatus, plug used for piercing apparatus, and method for producing seamless steel pipe

An inner surface regulation tool includes a mandrel, a plug which is detachably connected to the mandrel, and a connection member which connects the plug and the mandrel by a magnetic force. One of the plug and the mandrel includes a column-shaped portion which extends in an axial direction of the one, and the other of the plug and the mandrel includes a joining hole which extends in an axial direction of the other and into which the column-shaped portion is inserted. In addition, the connection member is a permanent magnet which is attached to at least one of the column-shaped portion and the joining hole.

Inner surface regulation tool, plug, mandrel, hot rolling mill, press piercing machine, and drawing machine

To increase the life of a plug used in a piercing machine for piercing-rolling a billet. The plug () is used in a piercing machine () that piercing-rolls a billet (). The plug () includes a plug body (), a build-up layer (), and a sprayed film (). The build-up layer () is formed on a surface of the plug body (). The sprayed film () covers at least an area ranging from the rear end of the build-up layer () to a position of the maximum outer diameter of the plug body ().

Plug used in piercing machine

A method of producing a seamless metal pipe, which can suppress the occurrence of lamination defects, is provided. A method of producing a seamless metal pipe according to an embodiment of the present invention includes the steps of: heating a high alloy containing, by mass %, Cr: 20 to 30% and Ni: more than 22% and not more than 60% in a first heating furnace (S2); piercing-rolling the high alloy heated in the first heating furnace with a first piercing machine to produce a hollow shell (S3); heating the hollow shell in a second heating furnace (S4); and elongation-rolling the hollow shell heated in the second heating furnace with the first piercing machine or a second piercing machine which is different from the first piercing machine (S5).

Method of producing seamless metal pipe

A plug for hot pipe making includes a plurality of plug pieces which is attachable to and detachable from one another, and a connection member which connects the plug pieces by a magnetic force. One of the plug pieces connected to each other includes a column-shaped portion which extends in an axis direction of the plug for hot pipe making, and the other includes a joining hole which extends in the axis direction of the plug for hot pipe making and into which the column-shaped portion is inserted. The connection member is a permanent magnet which is attached to at least one of the column-shaped portion and the joining hole.

Plug for hot pipe making

By using a piercing mill that includes a pusher on the entrance side, a plug on the exit side along a pass line, and a plurality of angled rolls as being provided around the plug so as face to each other, in the case where the maximum diameter of an unsound region consisting of center segregation and porosity in a cross section of a billet is d [mm], piercing-rolling is performed under the condition that the plug nose rolling reduction ratio (TDF) expressed by Formula (1) satisfies Formula (2).=(Bd&#x2212;1)/Bd&#x2003;&#x2003;(1)&#x2266;&#x2212;0.50&#xd7;(/Bd)+0.06&#x2003;&#x2003;(2)In Formulae (1) and (2), Bd is the billet diameter [mm], and Dis the opening [mm] between the angled rolls at the plug nose position. Thereby, when piercing-rolling is performed, the occurrence of an inner surface flaw attributable to the center segregation and porosity in the billet can be prevented reliably.

Method for producing seamless tube/pipe

A method of producing a seamless metal pipe, which can suppress the occurrence of inner surface flaws, is provided. A method of producing a seamless metal pipe according to an embodiment of the present invention includes the steps of: heating a high alloy billet BL containing, by mass %, Cr: 20 to 30% and Ni: more than 22% and not more than 60% in a heating furnace F(S); piercing-rolling the high alloy billet BL heated in the heating furnace Fwith a piercing machine Pto produce a hollow shell (S); cooling the hollow shell and then reheating the hollow shell in the heating furnace F(S); and elongation-rolling the heated hollow shell with the piercing machine P(S).

A method for manufacturing an Ni base alloy pipe stock comprises piercing and rolling a billet by use of Mannesmann piercing and rolling mill. The pipe stock has controlled amounts of C, Si, Mn, P, S, Cr, Ni, Mo, W, Cu, Al, N, with the balance being Fe. With the method, the following equations are satisfied, wherein values of T, Pand Prepresented by the following equations (1) to (3) being not more than 1300, not more than 200 and not less than 0, respectively=1380&#x2212;5000P&#x2212;100S&#x2212;4400C&#x2003;&#x2003;(1),Ni+10(Mo+0.5W)+100N&#x2003;&#x2003;(2),=(Ni&#x2212;50)+10(N&#x2212;0.1)&#x2212;2(Cr&#x2212;25)&#x2212;5(Mo+0.5W&#x2212;6)+12&#x2003;&#x2003;(3),wherein each element symbol in the equations represents mass % of the element concerned.

Method for manufacturing Ni base alloy pipe stock

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&#x2dc;30 mass % of sodium silicate equivalent to anhydride to 100 mass % of total mass of the first aqueous solution, and the second aqueous solution contains at least one kind selected from a group consisting of: an organic acid and water-soluble amine salts thereof, an inorganic acid and water-soluble amine salts thereof, a water-soluble amine, a water-soluble alcohol, and a water-soluble metal chloride. When the two-component anti-seizure agent is applied onto disk-roll type guide shoes, it can be provided and maintained on the circumferential surface of the disk-roll type guide shoes without washed away by rolls' cooling water. Thereby, the anti-seizure agent does not adhere to rolls and the rolls and a pipe material do not cause slippage each other. Thus, it is capable to carry out piercing-rolling of the pipe material.

Two-component anti-seizure agent for hot metal working process, and method of manufacturing seamless pipe using thereof

The present invention provides a lubricant composition for hot metal working which is capable of inhibiting generation of flaws on the surface of materials to be provided for hot metal working, and provides a method of hot metal working. The invention provides a lubricant composition for hot metal working comprising a plurality of glass frits respectively having different softening point from each other.

Lubricant composition for hot metal working and method of hot metal working using the same

There is provided an antioxidant agent capable of preventing scale from being produced on the surface of a heated metallic starting material more effectively than the conventional antioxidant agent. The antioxidant agent according to the present invention contains a plurality of glass frits having different softening points and an inorganic compound having a melting point not higher than 600&#xb0; C. The inorganic compound mainly softens in the low-temperature range of about 600&#xb0; C. The plurality of glass frits mainly soften in the low-temperature range of about 600 to 1300&#xb0; C. Therefore, the antioxidant agent covers the surface of metallic starting material in a broad temperature range, oxidizes the surface of metallic starting material, and prevents the production of scale.

Antioxidant agent and process for producing metallic material

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Tokyo, Japan

Kazuhiro Shimoda