JPS63126621A - Bending method for super 9 cr steel pipe - Google Patents
Bending method for super 9 cr steel pipeInfo
- Publication number
- JPS63126621A JPS63126621A JP27178086A JP27178086A JPS63126621A JP S63126621 A JPS63126621 A JP S63126621A JP 27178086 A JP27178086 A JP 27178086A JP 27178086 A JP27178086 A JP 27178086A JP S63126621 A JPS63126621 A JP S63126621A
- Authority
- JP
- Japan
- Prior art keywords
- super
- bending
- steel pipe
- cooling speed
- steel
- 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.)
- Pending
Links
- 238000005452 bending Methods 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 24
- 239000010959 steel Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 abstract description 9
- 238000000137 annealing Methods 0.000 abstract description 5
- 238000001125 extrusion Methods 0.000 abstract description 2
- 229910000734 martensite Inorganic materials 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 238000010791 quenching Methods 0.000 description 11
- 230000000171 quenching effect Effects 0.000 description 11
- 238000013003 hot bending Methods 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000005496 tempering Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は火カプラント超々臨界圧ボイラー主蒸気管用材
料として開発されたスーパー９ Ｏｒ（５ｕｐｅｒ ｃ
ｒ ）鋼（９Ｃｒ −Ｉ Ｍｏ −Ｗｂ、Ｖ ）管の曲
げ加工法に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention is directed to super 9 or (5uper c
r) A method of bending a steel (9Cr-IMo-Wb, V) pipe.
（従来の技術）
従来のスーパー９ Ｃｒ 鋼よりなる主蒸気管の曲げ
加工法を、第１図に基づいて説明する。(Prior Art) A conventional method for bending a main steam pipe made of Super 9 Cr steel will be described with reference to FIG.
チャッキング装置に保持されたスーパー？Ｏｒ鋼管より
なる主蒸気管１は加熱装置（こ＼では高周波コイル）２
によって局部的に加熱され、その加熱部３は押しローラ
４によって曲げ加工力を加えられて曲げられる。この現
象は管１の進行（チャッキング装置の押出しによる）と
共に連続して行なわれて曲げ管となる。Super held in a chucking device? The main steam pipe 1 made of Or steel pipe is a heating device (high frequency coil in this case) 2
The heated portion 3 is bent by applying a bending force by the push roller 4. This phenomenon occurs continuously as the tube 1 advances (due to extrusion by the chucking device), resulting in a bent tube.
また加熱装置！１２と冷却装置（こ＼では冷却リング）
５とを組合せ、加熱部５を管１の進行と共に冷却リング
５で急冷して後工程で行なう焼入れｑｔ省略する方法も
考えられるが、高周波加熱直後の冷却では、管径、肉厚
、材質により冷却速度にバラツキを生じ、不完全焼入れ
になり、不均一な材質になるおそれがある。Another heating device! 12 and cooling device (cooling ring in this case)
5, and the heating part 5 is rapidly cooled by the cooling ring 5 as the tube 1 advances, and the quenching process performed in the subsequent process can be omitted. This may cause variations in the cooling rate, resulting in incomplete quenching and non-uniform material quality.
このため、従来は高周波曲げ加工後、焼入れＱ’を行な
っている。したがって従来のこの種鋼管の曲げ加工の手
順は、高周波曲げ加工ＨＢ→焼入れＱ又は焼ならしＮ→
焼もどしＴ→（溶接部応力除去焼なましＳＲ）となりい
る。なお、こ＼に示した溶接部応力除去焼なましＳＲは
鋼管に溶接部がある場合に行なうもので、溶接部がない
場合には必要のないものである。For this reason, conventionally, quenching Q' is performed after high-frequency bending. Therefore, the conventional bending process for this type of steel pipe is high-frequency bending HB→quenching Q or normalizing N→
Tempering T → (weld part stress relief annealing SR). Note that the weld stress relief annealing SR shown here is performed when there is a weld on the steel pipe, and is not necessary when there is no weld.
すなわち、従来法は高周波曲げ加工Ｈａ条件全十分管理
することなく焼入れＱ条件を、例えば１０００〜１ｔＯ
ＯＣ，３時間、に維持することにより所要の特性全満足
させる手法である。In other words, in the conventional method, the quenching Q condition is changed from 1000 to 1 tO, for example, without fully controlling the high frequency bending Ha condition.
This method satisfies all the required characteristics by maintaining the temperature at OC for 3 hours.
従来法は、スーパー９Ｃｒ 鋼管の曲げ加工には、最低
、高周波加工ＨＢ、焼入れＱ又は焼ならしＮ→焼もどし
Ｔの工程を必要とし、工程が多数となる問題点金有する
。本発明は工程数を減らし省エネルギ的なスーパー９
Ｃｒ 鋼管の曲げ加工法を提供しようとするものであ
る。The conventional method requires at least the steps of high-frequency processing HB, quenching Q, or normalizing N→tempering T for bending super 9Cr steel pipes, and has the problem of requiring a large number of steps. The present invention reduces the number of steps and saves energy using Super 9.
This paper attempts to provide a method for bending Cr steel pipes.
本発明らは、スーパー９Ｃｒ 鋼は、自硬性の強い材料
特性を有しており、冷却速度に多小の差を、生じても、
特定の冷却速度を満足すれば材料の機械的性質に大差は
なく、この特性を生かして高周波曲げ加工時の加熱温度
（Ａｃ３以上）と冷却速度全十分管理すれば焼入れを省
略しても、焼入れを行った材料と同等な機械的特注が確
保され、省エネルギー、コスト低減につながることを確
認した。The present inventors believe that Super 9Cr steel has strong self-hardening material properties, and even if there are slight differences in cooling rate,
As long as a specific cooling rate is satisfied, there is no major difference in the mechanical properties of the material, and if you take advantage of this property and manage the heating temperature (Ac3 or higher) and cooling rate during high-frequency bending, even if quenching is omitted, quenching is possible. It was confirmed that mechanical customization equivalent to the material used in this process was secured, leading to energy savings and cost reductions.
本発明は上記知見に基づいて完成したものであって、ス
ーパー９ Ｏｒ 鋼管をＡｃ３以上に加熱して曲げ加工
し、その後ｋｏ、〜３００Ｃの間をＳＣｌ分以上の冷却
速度で冷却すること全特徴とするスーパー９Ｃｒｑｑ管
の曲げ加工法である。The present invention was completed based on the above knowledge, and all features include heating a Super 9 Or steel pipe to Ac3 or higher, bending it, and then cooling it between ko and 300C at a cooling rate of SCl or higher. This is a bending method for Super 9Crqq pipe.
（作用）
Ａｃ５点以上に加熱して曲げ加工後、Ａｃ、点〜５００
ｔｌ’の間を３Ｃ／分以上の冷却速度で冷却することに
よって、マルテンサイト単相の均一組織が得られる。(Function) After heating to Ac5 point or more and bending, Ac, point ~500
By cooling during tl' at a cooling rate of 3 C/min or more, a uniform martensite single phase structure can be obtained.
以下、本発明の実施態様を、第１図によって詳述する。Hereinafter, embodiments of the present invention will be explained in detail with reference to FIG.
径４５７．２ ｔｎｘ、厚さ８６酊の下記第１表に示す
化学組成のスーパー９ｃｒ＠管（ＡＳＭＥ ５Ａ２１３
Ｔ９１）よジなる大径肉厚管１を第１図に示した曲げ加
工装置音用い、第１図におけるＲ ｉ ２２８６１１Ｉ
！（スーパー９Ｃｒ 鋼管の径の５倍）とし、第２図に
示す熱間曲げ加工時冷却曲線に示すようにして曲げ加工
した。Super 9cr@ pipe (ASME 5A213
T91) Using the bending machine sound shown in FIG. 1 to bend the large diameter thick pipe 1, R i 228611I in FIG.
! (5 times the diameter of the Super 9Cr steel pipe), and bending was performed as shown in the cooling curve during hot bending shown in FIG.
第２図ｔａ）は熱間曲げ加工時のスーパ〜９ Ｏｒ鋼管
の各部の測定位置の温度のカーブであり、第２図ｆｔ）
ｌはそのスーパー９Ｃｒ ＠管の測定位置を示す。＠
２図のグラフより読み取った結果の平均を表とすると第
２のようになる。Figure 2 (ta) is the temperature curve at the measurement position of each part of the super-9 Or steel pipe during hot bending, and Figure 2 (ft)
l indicates the measurement position of the Super 9Cr @ tube. @
The second table shows the average results read from the graph in Figure 2.
第２表
上記本発明の実施態様と、従来法、すなわち熱間曲げ加
工ＨＢ→焼入Ｑ→焼もどしＴ（及び溶接部応力除去焼な
ましＳＲ）よりなる方法により処理したスーパー９ Ｃ
ｒ 鋼管の機械特性の比較の結果ｆｔ第３表、第４表
に示す。Table 2 Super 9 C processed by the embodiment of the present invention described above and the conventional method, that is, a method consisting of hot bending HB → quenching Q → tempering T (and weld stress relief annealing SR)
r Results of comparison of mechanical properties of steel pipes are shown in Tables 3 and 4.
第４表 供試材の衝撃性質、硬さ性質
（注）ＨＢ：熱間曲げ
ｑ：焼入れ
Ｔ二焼もどし
ＳＲ：応力除去焼なまし
ｔ：肉厚
第３表、第４表より室温及び高温（６００Ｃ）引張性質
、衝撃性質及び硬さ性質とも本発明方法による焼入れ省
略材は従来材と遜色するところなく、優れた機械的性質
を有していることがわかる。即ち、スーパー９ Ｃｒ
の有している材料特性を利用し、かつ高周波曲げ加工
時の冷却速度を十分管理すれば焼入れ＋Ｑｌｋ省略する
ことができる。Table 4 Impact properties and hardness properties of test materials (Note) HB: Hot bending q: Quenching T Second tempering SR: Stress relief annealing t: Wall thickness From Tables 3 and 4, room temperature and high temperature (600C) It can be seen that the quenched material obtained by the method of the present invention is comparable to conventional materials in terms of tensile properties, impact properties, and hardness properties, and has excellent mechanical properties. That is, Super 9 Cr
If the material properties of the steel are used and the cooling rate during high-frequency bending is sufficiently controlled, quenching + Qlk can be omitted.
以上、特定（入ＳＭＥ ５Ａ２１３ Ｔ９１ ）のスー
パー９Ｃｒ 調音用いて説明したが、本発明はこれに限
定されるものではなく、ＡＳＩＪＥ ５Ａ３８７ Ｇｒ
５１１ 。Although the above description has been made using a specific (input SME 5A213 T91) super 9Cr articulation, the present invention is not limited to this, and ASIJE 5A387 Gr
511.
＾ｓＭｇ ５Ａ３５５ Ｐ９１ 、 ＡＳＭＩＣＳ＾１
８２ Ｆ９１などのスーパー９Ｃｒ 鋼にも適用でき
る。^sMg 5A355 P91, ASMICS^1
It can also be applied to super 9Cr steel such as 82 F91.
（発明の効果）
本発明によって省エネルギー的なスーパー９Ｃｒ 鋼
管の曲げ加工法が提供しうる。(Effects of the Invention) The present invention can provide an energy-saving method for bending super 9Cr steel pipes.
第１図は本発明方法を含めたスーパー９ Ｃｒ鋼よりな
る主蒸気管の曲げ加工法の説明図、第２図は本発明方法
の熱間曲げ加工時の冷却状況を示す図で、（ｋｌは熱間
曲げ加工時のスーパー９Ｃｒ 鋼管の各部の測定位置
の温度カーブを示すグラフ、（ｂ）はそのスーパー９
Ｃｒ 鋼管の測定位置を示す図である。
復代理人 内 １） 明
復代理人 萩 原 亮 −
復代理人 安 西 篤 夫Figure 1 is an explanatory diagram of the bending process for main steam pipes made of Super 9 Cr steel, including the method of the present invention, and Figure 2 is a diagram showing the cooling status during hot bending using the method of the present invention. (b) is a graph showing the temperature curve of the measurement position of each part of Super 9Cr steel pipe during hot bending.
It is a figure showing the measurement position of a Cr steel pipe. Sub-Agents 1) Meifuku Agent Ryo Hagiwara − Sub-Agent Atsuo Anzai
Claims (1)
し、その後Ａｃ＿１〜３００℃の間を３℃／分以上の冷
却速度で冷却することを特徴とするスーパー９Ｃｒ鋼管
の曲げ加工法。A method for bending a Super 9Cr steel pipe, which comprises heating the Super 9Cr steel pipe to Ac_3 or higher, bending the pipe, and then cooling the pipe between Ac_1 and 300°C at a cooling rate of 3°C/min or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27178086A JPS63126621A (en) | 1986-11-17 | 1986-11-17 | Bending method for super 9 cr steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27178086A JPS63126621A (en) | 1986-11-17 | 1986-11-17 | Bending method for super 9 cr steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63126621A true JPS63126621A (en) | 1988-05-30 |
Family
ID=17504747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27178086A Pending JPS63126621A (en) | 1986-11-17 | 1986-11-17 | Bending method for super 9 cr steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63126621A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016056517A1 (en) * | 2014-10-07 | 2016-04-14 | 新日鐵住金株式会社 | Cooling apparatus and cooling method for steel material |
-
1986
- 1986-11-17 JP JP27178086A patent/JPS63126621A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016056517A1 (en) * | 2014-10-07 | 2016-04-14 | 新日鐵住金株式会社 | Cooling apparatus and cooling method for steel material |
| JP6015878B2 (en) * | 2014-10-07 | 2016-10-26 | 新日鐵住金株式会社 | Steel cooling device and cooling method |
| CN106794504A (en) * | 2014-10-07 | 2017-05-31 | 新日铁住金株式会社 | The cooling device and cooling means of steel |
| US20170304883A1 (en) * | 2014-10-07 | 2017-10-26 | Nippon Steel & Sumitomo Metal Corporation | Cooling apparatus and cooling method for steel material |
| CN106794504B (en) * | 2014-10-07 | 2019-12-24 | 日本制铁株式会社 | Steel material bending apparatus and method |
| US10625321B2 (en) | 2014-10-07 | 2020-04-21 | Nippon Steel Corporation | Cooling apparatus and cooling method for steel material |
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