【発明の詳細な説明】「産業上の利用分野」本発明は、鋼管の焼き入れ方法に関するものである。[Detailed description of the invention]"Industrial application field"The present invention relates to a method for hardening steel pipes.
「従来の技術」従来、鋼管の焼き入れは、鋼管を冷却水槽中に浸漬して
、内外両面から急冷していた。"Prior Art" Conventionally, steel pipes were quenched by immersing them in a cooling water tank to rapidly cool them from both the inside and outside.
「発明が解決しようとする課題」ところで、焼き入れ性の小さい合金成分の鋼管を、冷却
水槽中に浸漬して焼き入れ処理すると、鋼管に曲がりが
発生する。"Problems to be Solved by the Invention" By the way, when a steel pipe made of an alloy component with low hardenability is immersed in a cooling water bath and hardened, the steel pipe becomes bent.
この曲がりは、鋼管各部の焼き入れ効果が不均一になる
ために発生ずるものであって、鋼管の焼き入れ性が小さ
く、しかも鋼管の外径が小さい程発生し易い。This bending occurs because the hardening effect of each part of the steel pipe becomes uneven, and the bending is more likely to occur as the hardenability of the steel pipe is lower and the outside diameter of the steel pipe is smaller.
「課題を解決するための手段」本発明は、従来の鋼管の焼き入れ方法の問題点を解決す
べくなしたものであって、その要旨とするところは、鋼
管の焼き入れ時に、冷却水噴射用ノズル孔を有する給水
用マンドレルを焼き入れすべき鋼管内に挿入し、かつ給
水用マンドレルが挿入された鋼管を冷却水槽中に浸漬し
て、給水用マンドレルのノズル孔から鋼管の内周面に冷
却水を噴射することにある。"Means for Solving the Problems" The present invention has been made to solve the problems of the conventional steel pipe quenching method. A water supply mandrel having a water supply nozzle hole is inserted into the steel pipe to be hardened, and the steel pipe with the water supply mandrel inserted is immersed in a cooling water tank. The purpose is to inject cooling water.
「作用」前記の如＜、鋼管の焼き入れ時に、冷却水噴射用ノズル
孔を有する給水用マンドレルを焼き入れすべき鋼管内に
挿入し、かつ給水用マンドレルが挿入された鋼管を冷却
水槽中に浸漬して、給水用マンドレルのノズル孔から鋼
管の内固面乙こ冷知水を噴射することにより、マンドレ
ル自体によって、鋼管の焼き入れ時における曲がり１．
変形を支えることができると共に、鋼管の内周面に対し
て積極的に冷却水を噴射することにより、焼き入れ効果
を高めて、鋼管の曲がりを防止することができる。"Operation" As described above, when hardening a steel pipe, a water supply mandrel having a cooling water injection nozzle hole is inserted into the steel pipe to be hardened, and the steel pipe with the water supply mandrel inserted is placed in a cooling water tank. By immersing the pipe and spraying cooling water from the nozzle hole of the water supply mandrel to the inside of the steel pipe, the mandrel itself prevents the steel pipe from bending during quenching.
In addition to being able to support deformation, by actively spraying cooling water onto the inner circumferential surface of the steel pipe, it is possible to enhance the quenching effect and prevent the steel pipe from bending.
「実施例」次に本発明方法の実施例を図面に基づき以下に説明する
。"Example" Next, an example of the method of the present invention will be described below based on the drawings.
第１図に示す如く、焼き入れすべき鋼管１の搬送ライン
中において、−時停止中の鋼管１の一端から鋼管１内に
、冷却水噴射用ノズル孔２ａを有する給水用マンドレル
２を、任意の挿入１段により挿入し、給水用マンドレル
２が挿入された鋼管１を、１般送ラインから第２図に示
す如く、冷却水槽３に浸漬し、冷却水槽３内の一側方か
ら給水用ワンタンチジョイント４を前進させて、給水用
マンドレル２の基部に連結させ、給水用マンドレル２に
給水して、冷却水噴射用ノズル孔２ａから鋼管１の内周
面に冷却水を噴射させ、鋼管１の焼き入れを行うのであ
る。As shown in FIG. 1, in a conveyance line for steel pipes 1 to be hardened, a water supply mandrel 2 having a cooling water injection nozzle hole 2a is optionally inserted into the steel pipe 1 from one end of the steel pipe 1 which is stopped at -. The steel pipe 1 into which the water supply mandrel 2 has been inserted is immersed in the cooling water tank 3 from the first general feed line as shown in FIG. The one-button joint 4 is advanced and connected to the base of the water supply mandrel 2, water is supplied to the water supply mandrel 2, and cooling water is injected from the cooling water injection nozzle hole 2a onto the inner circumferential surface of the steel pipe 1. 1. Hardening is performed.
噴射用ノズル孔を有する給水用マンドレルを焼きなお、
鋼管１の内周面と、給水用マンドレル２の外周面との間
隙を一定に保持できるよう、第３図に示す如く、給水用
マンドレル２の外面長手方向に例えば１２０度間隔をも
ってリブ２ｂを形成しておいた方がよい。Reheating the water supply mandrel with the injection nozzle hole,
In order to maintain a constant gap between the inner circumferential surface of the steel pipe 1 and the outer circumferential surface of the water supply mandrel 2, ribs 2b are formed at intervals of, for example, 120 degrees on the outer surface of the water supply mandrel 2 in the longitudinal direction, as shown in FIG. It is better to keep it.
また第２図において、給水用マンドレル２の前半部のノ
ズル孔２ａからは冷却水が鋼管１の右側方向へ噴射され
るようにし、かつ給水用マンドレル２の後半部のノズル
孔２ａからは冷却水が鋼管１の左側方向へ噴射されるよ
うにしてもよい。In addition, in FIG. 2, the cooling water is injected from the nozzle holes 2a in the front half of the water supply mandrel 2 toward the right side of the steel pipe 1, and the cooling water is jetted from the nozzle holes 2a in the rear half of the water supply mandrel 2. may be injected toward the left side of the steel pipe 1.
因みに、鋼の成分が、Ｃ０，０９％、Ｓ ｉ−０、２６
％、Ｍ ｎ−１、３０％、Ｔｉ−０，０１１％、Ｂ−０
，００１４％で、外径６０．３１ｍ、肉厚４．５龍、長
さ１２１００ ｍｓの鋼管を従来方法で焼き入れしたと
ころ、焼き入れ後に搬送ラインに送れなかった程、曲が
りが発生した鋼管は４８％であったが、本発明方法で焼
き入れしたところ、焼ぎ入れ後に１般送ラインに送れな
かった鋼管は皆無であった。By the way, the composition of steel is C0.09%, Si-0.26
%, M n-1, 30%, Ti-0,011%, B-0
When a steel pipe with an outer diameter of 60.31 m, a wall thickness of 4.5 mm, and a length of 12100 ms was hardened using the conventional method, the pipe was bent so much that it could not be sent to the conveyor line after hardening. However, when quenching was performed using the method of the present invention, none of the steel pipes could not be sent to the first general transport line after quenching.
「発明の効果」以上述べた如く、鋼管の焼き入れ時に、冷却水入れすべ
き鋼管内に挿入し、かつ給水用マン１ルルが挿入された
鋼管を冷却水槽中に浸漬して、給水用マンドレルのノズ
ル孔から鋼管の内周面に冷却水を噴射することにより、
マンドレル自体によって、鋼管の焼き入れ時における曲
がり、変形を支えることができると共に、鋼管の内周面
に対して積極的に冷却水を噴射することにより、焼き入
れ効果を高めて、鋼管の曲がりを防止することができる
。"Effects of the Invention" As described above, when quenching a steel pipe, the water supply mandrel is inserted into the steel pipe into which cooling water is to be poured, and the steel pipe into which the water supply mandrel is inserted is immersed in the cooling water tank. By injecting cooling water onto the inner peripheral surface of the steel pipe from the nozzle hole,
The mandrel itself can support the bending and deformation of the steel pipe during hardening, and by actively spraying cooling water onto the inner peripheral surface of the steel pipe, the hardening effect is enhanced and the bending of the steel pipe is prevented. It can be prevented.
第１図および第２図は本発明方法の概略説明図第３図は
給水用マンドレルと鋼管との間隙保持手段の説明図であ
る。FIGS. 1 and 2 are schematic explanatory diagrams of the method of the present invention. FIG. 3 is an explanatory diagram of a means for maintaining a gap between a water supply mandrel and a steel pipe.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13807089AJPH036329A (en) | 1989-05-31 | 1989-05-31 | Method for hardening steel pipe |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13807089AJPH036329A (en) | 1989-05-31 | 1989-05-31 | Method for hardening steel pipe |
| Publication Number | Publication Date |
|---|---|
| JPH036329Atrue JPH036329A (en) | 1991-01-11 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13807089APendingJPH036329A (en) | 1989-05-31 | 1989-05-31 | Method for hardening steel pipe |
| Country | Link |
|---|---|
| JP (1) | JPH036329A (en) |
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| US8002910B2 (en) | 2003-04-25 | 2011-08-23 | Tubos De Acero De Mexico S.A. | Seamless steel tube which is intended to be used as a guide pipe and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8002910B2 (en) | 2003-04-25 | 2011-08-23 | Tubos De Acero De Mexico S.A. | Seamless steel tube which is intended to be used as a guide pipe and production method thereof |
| US8007603B2 (en)* | 2005-08-04 | 2011-08-30 | Tenaris Connections Limited | High-strength steel for seamless, weldable steel pipes |
| US8328958B2 (en) | 2007-07-06 | 2012-12-11 | Tenaris Connections Limited | Steels for sour service environments |
| US8328960B2 (en) | 2007-11-19 | 2012-12-11 | Tenaris Connections Limited | High strength bainitic steel for OCTG applications |
| US8221562B2 (en) | 2008-11-25 | 2012-07-17 | Maverick Tube, Llc | Compact strip or thin slab processing of boron/titanium steels |
| US10844669B2 (en) | 2009-11-24 | 2020-11-24 | Tenaris Connections B.V. | Threaded joint sealed to internal and external pressures |
| US11952648B2 (en) | 2011-01-25 | 2024-04-09 | Tenaris Coiled Tubes, Llc | Method of forming and heat treating coiled tubing |
| US8414715B2 (en) | 2011-02-18 | 2013-04-09 | Siderca S.A.I.C. | Method of making ultra high strength steel having good toughness |
| US9970242B2 (en) | 2013-01-11 | 2018-05-15 | Tenaris Connections B.V. | Galling resistant drill pipe tool joint and corresponding drill pipe |
| US9803256B2 (en) | 2013-03-14 | 2017-10-31 | Tenaris Coiled Tubes, Llc | High performance material for coiled tubing applications and the method of producing the same |
| US10378074B2 (en) | 2013-03-14 | 2019-08-13 | Tenaris Coiled Tubes, Llc | High performance material for coiled tubing applications and the method of producing the same |
| US10378075B2 (en) | 2013-03-14 | 2019-08-13 | Tenaris Coiled Tubes, Llc | High performance material for coiled tubing applications and the method of producing the same |
| US11377704B2 (en) | 2013-03-14 | 2022-07-05 | Tenaris Coiled Tubes, Llc | High performance material for coiled tubing applications and the method of producing the same |
| US9644248B2 (en) | 2013-04-08 | 2017-05-09 | Dalmine S.P.A. | Heavy wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes |
| US9657365B2 (en) | 2013-04-08 | 2017-05-23 | Dalmine S.P.A. | High strength medium wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes |
| US11105501B2 (en) | 2013-06-25 | 2021-08-31 | Tenaris Connections B.V. | High-chromium heat-resistant steel |
| US12129533B2 (en) | 2015-04-14 | 2024-10-29 | Tenaris Connections B.V. | Ultra-fine grained steels having corrosion- fatigue resistance |
| US11124852B2 (en) | 2016-08-12 | 2021-09-21 | Tenaris Coiled Tubes, Llc | Method and system for manufacturing coiled tubing |
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