JPS624830A - Heat treatment of large diameter weld steel pipe - Google Patents
Heat treatment of large diameter weld steel pipeInfo
- Publication number
- JPS624830A JPS624830A JP14044085A JP14044085A JPS624830A JP S624830 A JPS624830 A JP S624830A JP 14044085 A JP14044085 A JP 14044085A JP 14044085 A JP14044085 A JP 14044085A JP S624830 A JPS624830 A JP S624830A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- heater
- heat treatment
- large diameter
- heated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明は、大径溶接鋼管の熱処理方法に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for heat treating large diameter welded steel pipes.
最近、極めて苛酷な腐食条件を有する石油や天然ガス等
の地下資源の開発が進められており、このために、耐食
性に優れた高台Δにらなる大径溶接鋼管（以下、単に大
径管と云う）の需要が高まっている。Recently, the development of underground resources such as oil and natural gas, which have extremely severe corrosive conditions, has been progressing. ) is in increasing demand.
大径管は、ＵＯＥ造管機等によって製造された後、熱処
理が施こされるが、特に、高合金鋼からなる大径管は、
通常の炭素鋼からなる大径管に比べて、より高温度の基
で熱処理を施こす必要があり、そして、その溶接部は、
溶接部の品質を良好にする等の理由によシ、母材部に比
べ、さらに高温度で、しかも、狭い温度範囲の基で熱処
理を施こす必要がある。Large-diameter pipes are manufactured using UOE pipe-making machines and then subjected to heat treatment, but especially large-diameter pipes made of high-alloy steel,
Compared to large-diameter pipes made of ordinary carbon steel, it is necessary to heat treat them at higher temperatures, and the welded parts
For reasons such as improving the quality of the welded part, it is necessary to perform heat treatment at a higher temperature than that of the base metal, and in a narrower temperature range.
従来の、大径管の熱処理方法を第６図を参照しながら説
明する。A conventional heat treatment method for large diameter pipes will be explained with reference to FIG.
第６図に示すように、互いに密接させて一列に並べられ
た複数個の誘導加熱コイル２Ａ〜２Ｅからなる主加熱器
２は、この中を図中矢印方向に移動する大径管１を所定
温度に加熱する。主加熱器２は、その大径管１の移動方
向下流端が、上流端より下がるように傾斜している。主
加熱器２の下流端に近接した位置において、主加熱器２
の中心軸線の延長線上には、大径管１の外面に冷却水を
噴射するための外面冷却用ノズル３、および、大径管１
の内面に冷却水を噴射するための内面冷却用ノズル４が
設置されている。外面冷却用ノズル３には、冷却水供給
管３Ａが接続され、そして、内面冷却用ノズル４には、
冷却水供給管４Ａが、汰１（１管１内を通って接続され
ている。As shown in FIG. 6, the main heater 2 is made up of a plurality of induction heating coils 2A to 2E that are closely arranged in a row, and a large-diameter tube 1 that moves in the direction of the arrow in the figure is placed in a predetermined direction. Heat to temperature. The main heater 2 is inclined so that the downstream end in the direction of movement of the large diameter pipe 1 is lower than the upstream end. At a position close to the downstream end of the main heater 2, the main heater 2
On the extension line of the central axis of the large diameter pipe 1, there is an outer surface cooling nozzle 3 for injecting cooling water onto the outer surface of the large diameter pipe 1;
An inner surface cooling nozzle 4 is installed to inject cooling water onto the inner surface. A cooling water supply pipe 3A is connected to the outer surface cooling nozzle 3, and the inner surface cooling nozzle 4 is connected to the cooling water supply pipe 3A.
A cooling water supply pipe 4A is connected to the pipe 1 through the inside of the pipe 1.
図中矢印方向に移動する大径管１は、主加熱器２内にお
いて所定温度に加熱された後、直ちに、外面冷却用ノズ
ル３および内面冷却用ノズル４からの冷却水によって所
定温度まで冷却される。大径管１の内面を冷却した後の
、内面冷却用ノズル４からの冷却水は、大径管１内を流
れて、その下流端から外部に流出する。このようにして
、大径管１に連続的に熱処理が施こされる。The large diameter pipe 1 moving in the direction of the arrow in the figure is heated to a predetermined temperature in the main heater 2, and then immediately cooled to a predetermined temperature by cooling water from the outer surface cooling nozzle 3 and the inner surface cooling nozzle 4. Ru. After cooling the inner surface of the large diameter tube 1, the cooling water from the inner surface cooling nozzle 4 flows inside the large diameter tube 1 and flows out from its downstream end. In this way, the large diameter pipe 1 is continuously subjected to heat treatment.
しかし、上述した、従来の、大径管の熱処理方法は、次
の問題点を有していた。However, the conventional heat treatment method for large diameter pipes described above had the following problems.
■ 例えば、上述したように、高合金鋼からなる大径管
においては、大径管全体を高温度に加熱し、そして、溶
接部は、母材部よりさらに高温度で、しかも、狭い温度
範囲の基で熱処理を施こす必要があるが、従来法では、
主加熱器２のみによって大径管１を加熱しているので、
溶接部のみを高温度に加熱することはできなかった。■ For example, as mentioned above, in the case of large-diameter pipes made of high-alloy steel, the entire large-diameter pipe is heated to a high temperature, and the welded part is heated to an even higher temperature than the base metal, and the temperature range is narrower. It is necessary to perform heat treatment under the following conditions, but in the conventional method,
Since the large diameter pipe 1 is heated only by the main heater 2,
It was not possible to heat only the welded part to a high temperature.
■ 大径管を高温度に加熱すると、大径管が熱変形する
。例えば、ＣＲ２２、二相系ステンレス鋼管（直径：２
８インチ、肉厚：６．４吠）を１１００℃で熱処理した
ところ、最大直径と最小直径との差が４１ｉｕ＋となっ
た。このように大径管が熱変形すると、均一な加熱冷却
が行なえないばかりか、大径管の径が主加熱器２の内径
に近づくと、大径管１が主加熱器２に衝突して、熱処理
が続行できなくなることがある。■ If large diameter pipes are heated to high temperatures, they will be thermally deformed. For example, CR22, duplex stainless steel pipe (diameter: 2
When a 8-inch (wall thickness: 6.4 mm) was heat-treated at 1100° C., the difference between the maximum diameter and the minimum diameter was 41 iU+. If the large-diameter tube is thermally deformed in this way, not only will uniform heating and cooling not be possible, but if the diameter of the large-diameter tube approaches the inner diameter of the main heater 2, the large-diameter tube 1 will collide with the main heater 2. , heat treatment may not be able to continue.
従って、この発明の目的は、熱変形が防止できるととも
に、溶接部に高温度の基で熱処理を施こすことができる
、大径溶接鋼管の熱処理方法を提供することにある。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for heat treating large diameter welded steel pipes, which can prevent thermal deformation and also heat treat the welded portion at high temperatures.
この発明は、大径溶接鋼管を主加熱器によって加熱し、
この後、直ちに、前記大径溶接鋼管を冷却手段によって
冷却することからなる、大径溶接鋼管の熱処理方法にお
いて、前記大径溶接鋼管が、前記主加熱器によって加熱
される直前および／または加熱された直後に、前記大径
溶接鋼管の溶接部を補助加熱器によって加熱し、かくし
て、前記溶接部に、前記大径溶接鋼管の母材部に比べて
より高温度の基で熱処理を施こすことに特徴を有するも
のである。This invention heats a large diameter welded steel pipe with a main heater,
In the method for heat treatment of a large-diameter welded steel pipe, the method includes immediately cooling the large-diameter welded steel pipe by a cooling means, in which the large-diameter welded steel pipe is immediately before and/or heated by the main heater. Immediately after heating the welded portion of the large-diameter welded steel pipe with an auxiliary heater, the welded portion is thus subjected to heat treatment at a higher temperature than the base material of the large-diameter welded steel pipe. It has the following characteristics.
次に、この発明の一実施態様を図面を参照しながら説明
する。Next, one embodiment of the present invention will be described with reference to the drawings.
第１図は、この発明の一実施態様の熱処理方法によって
、大径管ｌ゛に熱処理を施こしている状態を示す正面図
である。第１図に示すよ°うに、この発明の一実施態様
の熱処理方法は、第５図に示した従来法において、主加
熱器２の、大径管１の移動方向上流端に近接した位置に
設置された補助加熱器５によって、大径管１の溶接部を
所定温度に予備加熱することに特徴を有するものであシ
、その他の構成は、従来法と同様である。FIG. 1 is a front view showing a state in which a large diameter pipe l' is being heat treated by a heat treatment method according to an embodiment of the present invention. As shown in FIG. 1, the heat treatment method according to an embodiment of the present invention differs from the conventional method shown in FIG. This method is characterized in that the welded portion of the large diameter pipe 1 is preheated to a predetermined temperature by the installed auxiliary heater 5, and the other configurations are the same as the conventional method.
上記補助加熱器５としては、ガスバーナや誘導加熱器等
を用いる。As the auxiliary heater 5, a gas burner, an induction heater, or the like is used.
図中矢印方向に移動する大径管１は、その溶接部が補助
加熱器５によって所定温度に予備加熱された後、主加熱
器２によって大径管１全体が所定温度に加熱される。こ
の後、直ちに、大径管１は、外面冷却用ノズル３および
内面冷却用ノズル４からの冷却水によって所定温度まで
冷却される。The welded portion of the large-diameter pipe 1 moving in the direction of the arrow in the figure is preheated to a predetermined temperature by the auxiliary heater 5, and then the entire large-diameter pipe 1 is heated to a predetermined temperature by the main heater 2. Thereafter, the large diameter pipe 1 is immediately cooled to a predetermined temperature by the cooling water from the outer surface cooling nozzle 3 and the inner surface cooling nozzle 4.
このように、大径管１全体を主加熱器２によって加熱す
る前に、大径管１の溶接部を補助加熱器５により予備加
熱することによって、溶接部を母−材部に比べて、より
高温度に加熱することが容易にできる。しかも、従来法
によれば、溶接部の品質向上をめざして溶接部を高温度
に加熱しようとすると、母材部も高温度に加熱せざるを
得す、このために、大径管１が熱変形することがあった
が、上述した、この発明の方法によれば、溶接部のみを
高温度に加熱することができるので、このような問題は
生じない。In this way, by preheating the welded part of the large diameter pipe 1 with the auxiliary heater 5 before heating the entire large diameter pipe 1 with the main heater 2, the welded part can be heated as compared to the base metal part. It can be easily heated to a higher temperature. Moreover, according to the conventional method, when trying to heat the welded part to a high temperature with the aim of improving the quality of the welded part, the base metal part must also be heated to a high temperature. However, according to the above-mentioned method of the present invention, only the welded portion can be heated to a high temperature, so such a problem does not occur.
次に、この発明の他の実施態様を図面を参照しながら説
明する。Next, other embodiments of the invention will be described with reference to the drawings.
第２図は、この発明の他の実施態様の熱処理方法によっ
て、大径管１に熱処理を施こしている状態を示す正面図
である。この熱処理方法は、大径管１の溶接部を、主加
熱器２の下流端と外面冷却用ノズル３との間に設置した
補助加熱器５によって加熱することに特徴を有するもの
で６Ｄ、この他の構成は、上述した、この発明の一実施
態様の熱処理方法と同様である。FIG. 2 is a front view showing a state where the large diameter pipe 1 is being heat treated by a heat treatment method according to another embodiment of the present invention. This heat treatment method is characterized in that the welded portion of the large diameter pipe 1 is heated by the auxiliary heater 5 installed between the downstream end of the main heater 2 and the outer surface cooling nozzle 3. The other configurations are similar to the heat treatment method of one embodiment of the present invention described above.
この熱処理方法によっても、上述した、この発明の一実
施態様の熱処理方法におけると同様に、大径管１に熱変
形を生じさせることなく、その溶接部を高温度に加熱す
ることができるが、この場合、補助加熱器５は、主加熱
器２の下流端に近接した位置に設けられているので、上
述した、この発明の一実施態様に比べて、溶接部からの
放熱ロスが小さい。従って、溶接部の加熱効果がよシ大
きくなる。With this heat treatment method as well, the welded portion of the large diameter pipe 1 can be heated to a high temperature without causing thermal deformation in the large diameter pipe 1, as in the heat treatment method of the embodiment of the present invention described above. In this case, since the auxiliary heater 5 is provided at a position close to the downstream end of the main heater 2, the heat radiation loss from the welded portion is smaller than in the above-described embodiment of the present invention. Therefore, the heating effect of the welded portion becomes even greater.
第３図に、この発明の更に別の実施態様の熱処理方法に
よって、大径管に熱処理を施こしている状態を示す。こ
の熱処理方法は、主加熱器２の上流端に近接した位置に
設置した補助加熱器５Ａと、主加熱器２の下流端と外面
冷却用ノズル３との間に設置した別の補助加熱器５Ｂと
によって、大径管１の溶接部を加熱することに特徴を有
するものであり、この他の構成は、上述した、この発明
の一実施態様の熱処理方法と同様である。FIG. 3 shows a state where a large diameter pipe is being heat treated by a heat treatment method according to still another embodiment of the present invention. This heat treatment method includes an auxiliary heater 5A installed at a position close to the upstream end of the main heater 2, and another auxiliary heater 5B installed between the downstream end of the main heater 2 and the outer surface cooling nozzle 3. This method is characterized by heating the welded portion of the large-diameter pipe 1, and the other configurations are the same as the heat treatment method of the embodiment of the present invention described above.
この熱処理方法によれば、上述した、この発明の実施態
様におけると同様な効果に加えて、溶接部の加熱温度を
よシ正確に制御することができるという効果が得られる
。According to this heat treatment method, in addition to the same effects as in the embodiments of the present invention described above, it is possible to obtain the effect that the heating temperature of the welded portion can be controlled more accurately.
補助加熱器による溶接部の温度上昇代は、放熱ロス（℃
／分）と、主加熱器における各誘導加熱コイルの加熱効
率とによって決まる。このために、溶接部の加熱温度制
御は、前記加熱効率を考慮して行なう必要がある。The temperature rise of the welded part due to the auxiliary heater is the heat radiation loss (°C
/min) and the heating efficiency of each induction heating coil in the main heater. For this reason, it is necessary to control the heating temperature of the welded portion in consideration of the heating efficiency.
第４図に、第１図に示した、この発明の一実施態様によ
って、大径管に熱処理を施こしたときの、主加熱器によ
る温度上昇の一例を示し、第５図に、随１〜随４の各誘
導加熱コイルによる溶接部の加熱効率の結果を示す。な
お、前記加熱効率は、補助加熱器によって溶接部を予備
加熱しないときの溶接部の温度と、補助加熱器によって
溶接部を予備加熱したときの溶接部の温度との間の差（
第４図中■で示す）を、放熱温度（第４図中の）で除し
た値を百分率で表わしたものである。FIG. 4 shows an example of the temperature rise caused by the main heater when a large-diameter pipe is subjected to heat treatment according to one embodiment of the present invention shown in FIG. 1, and FIG. - The results of the heating efficiency of the welded part by each induction heating coil in Volume 4 are shown. Note that the heating efficiency is the difference between the temperature of the welding zone when the welding zone is not preheated by the auxiliary heater and the temperature of the welding zone when the welding zone is preheated by the auxiliary heater (
The value obtained by dividing the heat radiation temperature (indicated by ■ in FIG. 4) by the heat radiation temperature (indicated by ■ in FIG. 4) is expressed as a percentage.
次に、この発明を実施例によシ更に説明する。Next, the present invention will be further explained using examples.
直径：２０１、肉厚：１４．３．の二相系ステンレス鋼
管に、第１図に示した、この発明の方法によって熱処理
を施こした。プロパンガスバーナーからなる補助加熱器
５は、主加熱器２の上流端から２０００、離れた位置に
設置し、溶接部の予備加熱温度は、３５５℃とし、大径
管の目標熱処理温度は、１１ｏＯ±５０℃とした。この
ようにして、溶接部の温度を最大１１１１℃まで上昇さ
せて、大径管に熱処理を施こした。そして、このように
して得られた大径管の品質を調べたところ溶接部および
母材部とも全く異状は認められなかった。Diameter: 201, wall thickness: 14.3. A duplex stainless steel pipe was heat-treated by the method of the present invention shown in FIG. The auxiliary heater 5 consisting of a propane gas burner is installed at a position 2000 mm away from the upstream end of the main heater 2, the preheating temperature of the welded part is 355°C, and the target heat treatment temperature of the large diameter pipe is 11oO The temperature was ±50°C. In this way, the temperature of the welded portion was raised to a maximum of 1111° C., and the large diameter pipe was heat treated. When the quality of the large-diameter pipe thus obtained was examined, no abnormality was observed in the welded part or the base metal part.
なお、この発明の熱処理方法は、上述したようにストレ
ートシーム溶接による鋼管以外に、スパイラルシー ム
溶接による鋼管にも適用できることは勿論である。It should be noted that the heat treatment method of the present invention can of course be applied not only to straight seam welded steel pipes as described above but also to spiral seam welded steel pipes.
以上説明したように、この発明によれば、熱変形が防止
できるとともに、溶接部に、母材部と比べてより高温度
の基で熱処理を施こすことができるといったきわめて有
用な効果がもたらされる。As explained above, according to the present invention, thermal deformation can be prevented and the welded part can be heat treated at a higher temperature than the base metal, which is an extremely useful effect. .
第１図〜第３図は、この発明の実施態様によって、大径
管に熱処理を施こしている状態を示す正面図、第４図は
、この発明の熱処理方法によって、溶接部を加熱した場
合および加熱しない場合におゆ゛る溶接部の温度変化を
示すグラフ、第５図は、主加熱器における各誘導加熱コ
イルの加熱効率を示すグラフ、第６図は、従来法によっ
て大径管に熱処理を施している状態を示す正面図である
。図面において、Figures 1 to 3 are front views showing a state where a large diameter pipe is being heat treated according to an embodiment of the present invention, and Figure 4 is a front view showing a state in which a welded part is heated by the heat treatment method of the present invention. Figure 5 is a graph showing the heating efficiency of each induction heating coil in the main heater, and Figure 6 is a graph showing the temperature change of the welded part when no heating is performed. FIG. 3 is a front view showing a state where heat treatment is being performed. In the drawing,
Claims (1)
に、前記大径溶接鋼管を冷却手段によつて冷却すること
からなる、大径溶接鋼管の熱処理方法において、 前記大径溶接鋼管が、前記主加熱器によつて加熱される
直前および／または加熱された直後に、前記大径溶接鋼
管の溶接部を補助加熱器によつて加熱し、かくして、前
記溶接部に、前記大径溶接鋼管の母材部に比べてより高
温度の基で熱処理を施こすことを特徴とする、大径溶接
鋼管の熱処理方法。[Claims] A method for heat treatment of a large-diameter welded steel pipe, which comprises heating the large-diameter welded steel pipe with a main heater, and then immediately cooling the large-diameter welded steel pipe with a cooling means. , Immediately before and/or immediately after the large-diameter welded steel pipe is heated by the main heater, the welded portion of the large-diameter welded steel pipe is heated by an auxiliary heater, and thus the welding A method for heat treating a large-diameter welded steel pipe, the method comprising: heat-treating the base metal part of the large-diameter welded steel pipe at a higher temperature than the base metal part of the large-diameter welded steel pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14044085A JPS624830A (en) | 1985-06-28 | 1985-06-28 | Heat treatment of large diameter weld steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14044085A JPS624830A (en) | 1985-06-28 | 1985-06-28 | Heat treatment of large diameter weld steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS624830A true JPS624830A (en) | 1987-01-10 |
| JPH026811B2 JPH026811B2 (en) | 1990-02-14 |
Family
ID=15268692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14044085A Granted JPS624830A (en) | 1985-06-28 | 1985-06-28 | Heat treatment of large diameter weld steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS624830A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5536050A (en) * | 1978-09-05 | 1980-03-13 | Matsushita Electronics Corp | Ultrasonic wave wire bond method |
| JPS6046321A (en) * | 1983-08-23 | 1985-03-13 | Nippon Kokan Kk <Nkk> | Manufacture of seam welded pipe |
-
1985
- 1985-06-28 JP JP14044085A patent/JPS624830A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5536050A (en) * | 1978-09-05 | 1980-03-13 | Matsushita Electronics Corp | Ultrasonic wave wire bond method |
| JPS6046321A (en) * | 1983-08-23 | 1985-03-13 | Nippon Kokan Kk <Nkk> | Manufacture of seam welded pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH026811B2 (en) | 1990-02-14 |
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