JPH0718331A - Manufacture of 13 chromium stainless steel bent tube - Google Patents
Manufacture of 13 chromium stainless steel bent tubeInfo
- Publication number
- JPH0718331A JPH0718331A JP19192493A JP19192493A JPH0718331A JP H0718331 A JPH0718331 A JP H0718331A JP 19192493 A JP19192493 A JP 19192493A JP 19192493 A JP19192493 A JP 19192493A JP H0718331 A JPH0718331 A JP H0718331A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- bending
- stainless steel
- pipe
- temperature range
- 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.)
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- Heat Treatment Of Articles (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、腐食環境に供される配
管構成材として有用な１３クロム系ステンレス鋼曲げ管
の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a 13 chromium type stainless steel bent pipe which is useful as a pipe constituent material subjected to a corrosive environment.
【０００２】[0002]
【従来の技術】低Ｃ−Ｃｒマルテンサイト系ステンレス
鋼、所謂１３クロム系鋼は、腐食、酸化を問題とする構
造用材料として、例えばその鋳造管は、石油・天然ガス
生産井であるサワー油井、スウィート油井等における配
管材として使用されている。配管構築施工においては、
直管同士を接続する管継手として、エルボウ管や、Ｕ字
管等の曲げ管が使用される。その曲げ管は、遠心力鋳造
された直管を素管とし、これを曲げ加工することにより
製造することができ、高周波曲げ加工法はその代表的な
加工方法として実施されている。１３クロム系鋼のオー
ステナイト変態開始温度Ａｓ（Ａｃ1 ）点は約７９８
℃、変態終了温度Ａｆ（Ａｃ3 ）点は約８６０℃であ
り、その遠心力鋳造管体を素管とする高周波曲げ加工
は、８００℃前後（約８００〜８５０℃）の温度域、ま
たは約９５０〜１０５０℃の温度域を加工温度として行
われる。その曲げ加工により、例えば３ＤＲ、１．５Ｄ
Ｒ等の曲げ形状を有する曲げ管を製造することができ
る。2. Description of the Related Art Low C-Cr martensitic stainless steel, so-called 13 chromium steel, is a structural material having problems of corrosion and oxidation. For example, its casting pipe is a sour oil well for producing oil and natural gas. It is used as a piping material in sweet oil wells. In plumbing construction,
As a pipe joint for connecting straight pipes, an elbow pipe or a bent pipe such as a U-shaped pipe is used. The bending pipe can be manufactured by bending a centrifugally cast straight pipe as a raw pipe, and the high-frequency bending method is implemented as a typical processing method. The austenite transformation start temperature As (Ac 1 ) point of 13 chromium steel is about 798.
℃, transformation end temperature Af (Ac 3 ) point is about 860 ℃, the high-frequency bending process using the centrifugal force casting tube body as a raw tube, the temperature range of about 800 ℃ (about 800 ~ 850 ℃), or The processing temperature is in the temperature range of 950 to 1050 ° C. Depending on the bending process, for example, 3DR, 1.5D
A bent tube having a bent shape such as R can be manufactured.
【０００３】[0003]
【発明が解決しようとする課題】上記高周波曲げ加工に
より製造される曲げ管を、サワー油井等の配管材として
使用するには、耐食性の他に、強度や靱性等の諸特性を
具備するものであることを要する。上記高周波曲げ加工
により製造される曲げ管は、曲げ加工過程でマルテンサ
イト変態を生じるので、その曲げ加工後、所要の材料特
性を充足させるための後熱処理を施すことが必要とな
る。しかしながら、そのための適当な熱処理についての
具体的な指針のないのが現状である。その熱処理とし
て、例えばＪＩＳ Ｇ５１２１の１３クロム系ステンレ
ス鋼鋳鋼品（ＳＣＳ１）に関する規定に準拠した焼入れ
・焼戻し処理、すなわち温度９５０℃以上に加熱して基
地組織を一旦オーステナイト相としたうえ、同温度から
の焼入れによりマルテンサイト変態を生起させ、ついで
６８０〜７４０℃の温度域での焼戻し処理を行うことも
考えられるが、その焼入れ・焼戻しを行つて得られる管
材は、硬度Ｈｖ(10)約２１０程度で、これに溶接が施さ
れると、熱影響部は著しく硬質で靱性の乏しいものとな
る。このため、配管施工では溶接継手部の割れの問題を
付随し、またサワー油井用配管材等としての実使用過程
では、Ｈ2 侵入に起因する応力腐食割れの問題を付随す
る。本発明は、高周波曲げ加工により製造される１３ク
ロム系鋼曲げ管について、配管構成材等として改良され
た材料特性を具備せしめるべく鋭意研究の結果、その最
適の熱処理条件を見出して完成されたものである。In order to use the bent pipe manufactured by the above high frequency bending process as a piping material for sour oil wells, etc., it is required to have various characteristics such as strength and toughness in addition to corrosion resistance. I need to be there. Since the bent pipe manufactured by the above high frequency bending process undergoes martensitic transformation in the bending process, it is necessary to perform post heat treatment for satisfying the required material properties after the bending process. However, at present, there is no specific guideline for appropriate heat treatment for that purpose. As the heat treatment, for example, a quenching / tempering treatment conforming to the regulations of JIS G5121 13-chromium stainless steel cast steel (SCS1), that is, heating to a temperature of 950 ° C. or higher to temporarily transform the matrix structure into an austenite phase, and then from the same temperature It is conceivable to induce martensitic transformation by quenching and then perform tempering treatment in the temperature range of 680 to 740 ° C, but the pipe material obtained by carrying out the quenching and tempering has hardness Hv (10) of about 210 Then, when this is welded, the heat-affected zone becomes extremely hard and poor in toughness. For this reason, the problem of cracking of the welded joint is involved in piping work, and the problem of stress corrosion cracking due to H 2 intrusion is involved in the actual use process as a sour oil well piping material. The present invention was completed by finding the optimum heat treatment conditions as a result of earnest research on 13 chromium steel bending pipes manufactured by high-frequency bending so as to have improved material properties as piping components and the like. Is.
【０００４】[0004]
【課題を解決するための手段】本発明の１３クロム系ス
テンレス鋼曲げ管の製造方法は、その遠心力鋳造管を、
温度８００〜８５０℃、または９５０〜１０５０℃で高
周波曲げ加工した後、温度８００〜８５０℃に加熱保持
して同温度から焼入れし、ついで７００〜７５０℃の温
度域に加熱保持した後、空冷する焼戻しを行うことを特
徴としている。本発明においては、高周波曲げ加工を、
約８００〜８５０℃の温度域で行つた場合は、上記焼入
れ・焼戻しの２段の熱処理に代え、その焼戻し処理と同
じ条件の熱処理、すなわち７００〜７５０℃の温度域に
加熱保持した後、空冷する熱処理のみを行つて、首尾よ
く所期の材質改善の目的を達することができる。A method for manufacturing a 13-chromium stainless steel bent pipe according to the present invention includes a centrifugal casting pipe,
After high-frequency bending at a temperature of 800 to 850 ° C. or 950 to 1050 ° C., it is heated and held at a temperature of 800 to 850 ° C. and quenched from the same temperature, and then heated and kept in a temperature range of 700 to 750 ° C., and then air cooled. It is characterized by tempering. In the present invention, high-frequency bending processing,
When it is performed in a temperature range of about 800 to 850 ° C, instead of the two-step heat treatment of quenching and tempering, heat treatment under the same conditions as the tempering treatment, that is, after heating and holding in the temperature range of 700 to 750 ° C, air cooling is performed. It is possible to successfully achieve the desired purpose of improving the material by performing only the heat treatment.
【０００５】[0005]
【作用】高周波曲げ加工を受けて成形された１３クロム
系ステンレス鋼曲げ管は、その曲げ加工につづいて行わ
れる上記熱処理により、硬度はＨｖ(10)約２１０以下
（概ね２００前後）に軟質化される。その軟質化により
良好な延性・靱性が確保され、しかも降伏点は４２．２
ｋｇ／ｍｍ2 以上（概ね４５ｋｇ／ｍｍ2 以上）と高強
度であり、かつ降伏比は、約０．８以下と、低降伏比も
確保される。延靱性の向上効果として、配管構築施工に
要求される溶接性も良好となる。[Function] The 13-chrome stainless steel bent pipe formed by high-frequency bending is softened to have a hardness of Hv (10) of about 210 or less (generally around 200) by the heat treatment performed after the bending. To be done. The softening ensures good ductility and toughness, and the yield point is 42.2.
It has a high strength of not less than kg / mm 2 (generally not less than 45 kg / mm 2 ) and a yield ratio of about 0.8 or less, and a low yield ratio is secured. As an effect of improving the ductility, the weldability required for pipe construction work also becomes good.
【０００６】以下、本発明について詳しく説明する。高
周波曲げ加工に供せられる直管は、遠心力鋳造の常法に
従って製造された鋳造管であり、表面の鋳肌を除去する
ための機械加工が加えられて曲げ加工に供する。管径や
管壁肉厚等の管サイズに特段の制限はなく、大小・厚薄
任意の管サイズを適用することができる。高周波曲げ加
工は常法に従って行われる。加工温度は、約８００℃前
後（概ね８００〜８５０℃）のフェライト・オーステナ
イト二相混相域、または約９５０〜１０５０℃のオース
テナイト単相温度域に設定される。この温度域におい
て、伸び特性が高く、良好な成形加工性が得られるから
である。加工速度（管材の送り速度）は、約０．５〜
１．５ｍｍ／秒程度に調整すればよく、また曲げ加工を
受けた管の変形（断面形状のゆがみ・楕円化）を防止す
るために行う曲げ加工直後の管体の冷却、水冷または空
冷のいずれでもよい。The present invention will be described in detail below. The straight pipe that is subjected to the high-frequency bending process is a casting pipe that is manufactured according to the usual method of centrifugal casting, and is subjected to mechanical processing to remove the surface casting surface and then subjected to the bending process. There is no particular limitation on the pipe size such as the pipe diameter and the wall thickness of the pipe, and it is possible to apply any pipe size of large, small or thick. The high frequency bending process is performed according to a conventional method. The processing temperature is set to a ferrite / austenite two-phase mixed phase region of about 800 ° C. (generally 800 to 850 ° C.) or an austenite single phase temperature region of about 950 to 1050 ° C. This is because in this temperature range, the elongation property is high and good moldability can be obtained. The processing speed (feeding speed of pipe material) is about 0.5 ~
It may be adjusted to about 1.5 mm / sec, and either cooling of the pipe body immediately after bending, water cooling or air cooling, which is performed to prevent deformation of the pipe that has been subjected to bending (distortion of the cross-sectional shape, ovalization) But it's okay.
【０００７】上記高周波曲げ加工により所定形状に成形
された曲げ管を軟質化するための熱処理条件について、
先ず、曲げ加工が温度約９５０〜１０５０℃のオーステ
ナイト単相温度域で行なわれた場合の熱処理の熱処理に
ついて説明する。この場合の熱処理は、約８００〜８５
０℃の温度域に加熱保持した後、急冷（空冷または水
冷）する焼入れ処理と、温度約７００〜７５０℃の温度
域に加熱保持した後、空冷する焼戻し処理の２段の熱処
理を行う。焼入れ処理における上記温度域での加熱保持
時間は、約１Ｈｒ以上とすればよく、焼戻し処理での加
熱保持時間は、約２Ｈｒ以上とすればよい。第１段の焼
入れ処理における焼入れ温度（８００〜８５０℃）の下
限温度を８００℃としたのは、それより低い温度では、
焼入れ効果が得られないからであり、好ましくは８２０
℃以上である。他方、上限温度を８５０℃としたのは、
それを越える高温域では、ほとんどがオーステナイト化
され、従ってマルテンサイト変態を多量に生じるため、
所定の機械的性質が得られず、特に低降伏化（０．８以
下）の確保が困難となるからである。また、第２段の焼
戻し処理における処理温度を、７００〜７５０℃の範囲
に限定したのは、７００℃に満たない温度では、マルテ
ンサイト相の焼戻しが不十分となり、靱性の不足をきた
すからであり、他方７５０℃を越える高温度では、一部
に再びマルテンサイト変態を生じることがあるからであ
る。Regarding the heat treatment conditions for softening the bending pipe formed into a predetermined shape by the above high frequency bending,
First, the heat treatment of the heat treatment in the case where the bending is performed in the austenite single phase temperature range of about 950 to 1050 ° C will be described. The heat treatment in this case is about 800-85.
After heating and holding in a temperature range of 0 ° C., quenching treatment of rapid cooling (air cooling or water cooling) and holding in a temperature range of about 700 to 750 ° C. followed by tempering treatment of air cooling are performed in two stages. The heating and holding time in the above temperature range in the quenching treatment may be about 1 hour or more, and the heating and holding time in the tempering treatment may be about 2 hours or more. The lower limit temperature of the quenching temperature (800 to 850 ° C.) in the first-stage quenching process was set to 800 ° C.
This is because the quenching effect cannot be obtained, and preferably 820
℃ or above. On the other hand, the upper limit temperature is set to 850 ° C.
In a high temperature range exceeding that, most of them are austenitized, and therefore a large amount of martensitic transformation occurs,
This is because predetermined mechanical properties cannot be obtained, and it is difficult to secure a low yield (0.8 or less). Further, the reason for limiting the treatment temperature in the second-stage tempering treatment to the range of 700 to 750 ° C. is that the tempering of the martensite phase becomes insufficient at a temperature of less than 700 ° C., resulting in insufficient toughness. On the other hand, at a high temperature exceeding 750 ° C., martensite transformation may be partially generated again.
【０００８】一方、高周波曲げ加工を、８００℃前後の
温度域（約８００〜８５０℃）で行つた場合の加工後の
熱処理についても、前記の加工温度約９５０〜１０５０
℃の高周波曲げ加工後の場合の熱処理と同一の焼入れ・
焼戻し処理からなる２段の熱処理を適用して所定の材質
改善を達成することができる。また、この場合は、上記
焼入れ・焼戻しの２段の熱処理に代え、約７００〜７５
０℃の温度域に適当時間加熱保持した後、空冷する熱処
理を行うだけで、所期の材質改善を達成することができ
る。これは、この場合の高周波曲げ加工が温度約８００
℃前後、すなわちＡｃ1 とＡｃ3 の間の温度域（フェラ
イト相とオーステナイト相との混相域）で行われている
ので、曲げ加工過程で生じるマルテンサイト変態は組織
の一部に留まり、従って変態に伴う硬度上昇は小さいか
らである。この場合の処理温度を、約７００〜７５０℃
とするのは、７００℃より低い温度では、マルテンサイ
ト相を充分に焼戻しマルテンサイトに変態させることが
できず、８５０℃を越える高温では、マルテンサイト変
態が多量に発生し、機能的性質を満足できなくなるから
である。処理時間は、上記と同様約２Ｈｒ以上であれば
よい。On the other hand, with respect to the heat treatment after processing when the high frequency bending is performed in a temperature range around 800 ° C. (about 800 to 850 ° C.), the above-mentioned processing temperature is about 950 to 1050.
The same quenching as the heat treatment after high-frequency bending at ℃ ・
A predetermined material improvement can be achieved by applying a two-step heat treatment consisting of tempering. In this case, instead of the two-step heat treatment of quenching and tempering, about 700 to 75
The desired material improvement can be achieved only by performing heat treatment of air cooling after heating and holding in the temperature range of 0 ° C. for an appropriate time. This is because the high frequency bending process in this case is about 800
Since it is performed around ℃, that is, in the temperature range between Ac 1 and Ac 3 (mixed phase area of ferrite phase and austenite phase), the martensitic transformation that occurs in the bending process remains in a part of the structure and therefore the transformation occurs. This is because the increase in hardness due to is small. The processing temperature in this case is about 700 to 750 ° C.
The reason is that at a temperature lower than 700 ° C., the martensite phase cannot be sufficiently transformed into tempered martensite, and at a temperature higher than 850 ° C., a large amount of martensite transformation occurs to satisfy the functional properties. Because it will not be possible. The treatment time may be about 2 hours or more as in the above case.
【０００９】なお、本発明に使用される１３クロム系ス
テンレス鋼は、ＪＩＳ Ｇ５１２１ＳＣＳ１として規定
されている鋳鋼に準ずる組成、すなわちＣ：０．１５％
以下，Ｓｉ：１．５％以下，Ｍｎ：１％以下，Ｐ：０．
０４％以下，Ｓ：０．０４％以下，Ｃｒ：１１．５〜１
４％，残部Ｆｅからなり、所望により、１％以下にＮｉ
や、０．６％以下のＭｏを含有する組成を有するもので
あつてよい。また、その化学組成について、Ｃを０．０
８％以下，Ｓｉを０．８％以下，Ｍｎを１％以下，Ｃｒ
を１１〜１３．５％の範囲に規定した鋼を使用すること
は、管材の加工性および延靱性をより良好なものとする
点で好ましいことである。The 13 chromium stainless steel used in the present invention has a composition similar to that of cast steel specified in JIS G5121SCS1, that is, C: 0.15%.
Hereinafter, Si: 1.5% or less, Mn: 1% or less, P: 0.
04% or less, S: 0.04% or less, Cr: 11.5-1
4%, balance Fe, and if desired 1% or less Ni
Alternatively, it may have a composition containing 0.6% or less of Mo. Regarding its chemical composition, C is 0.0
8% or less, Si 0.8% or less, Mn 1% or less, Cr
It is preferable to use steel in which the range of 11 to 13.5% is specified in order to improve the workability and ductility of the pipe material.
【００１０】[0010]
〔１〕供試素管 下記の遠心力鋳造管を使用。 化学組成（重量％）：Ｃ０．０６，Ｓｉ０．３，Ｍｎ
０．８，Ｐ０．０１８，Ｓ０．００７，Ｎｉ０．８，Ｃ
ｒ１２．１，Ｍｏ０．３５，Ｆｅ Ｂａｌ。 管サイズ（機械加工後）：外径７６２ｍｍ，肉厚２４ｍ
ｍ。 〔２〕高周波曲げ加工条件 下記の加工条件によりベンドを成形。 加工温度：表１中、「曲げ加工」欄参照、 加工速度：０．４ｍｍ／秒、 加工部の冷却：水冷または空冷（表１中、「曲げ加工」
欄のかつこ内に記載） 曲げ半径Ｒ：１．５Ｄ。 〔３〕熱処理条件 表１参照。[1] Test tube The following centrifugal casting tube is used. Chemical composition (% by weight): C0.06, Si0.3, Mn
0.8, P0.018, S0.007, Ni0.8, C
r12.1, Mo0.35, Fe Bal. Tube size (after machining): outer diameter 762mm, wall thickness 24m
m. [2] High-frequency bending processing conditions A bend is formed under the following processing conditions. Machining temperature: See "Bending" column in Table 1, Machining speed: 0.4 mm / sec, Cooling of machining area: Water cooling or air cooling ("Bending" in Table 1)
Bending radius R: 1.5D. [3] Heat treatment conditions See Table 1.
【００１１】〔４〕管材諸特性 熱処理後の各供試曲げ管について諸特性を測定し、表１
に示す結果を得た。No.10,11、およびNo.20 〜23は発明
例、No.30,31は比較例である。発明例No.10,および11
は、曲げ加工を、Ａｃ3 点以上の温度域（オーステナイ
ト単相域）で行つた例、No.20 〜23は、曲げ加工を、Ａ
ｃ1 〜Ａｃ3 点の温度域（フェライト・オーステナイト
２相域）で行つた例である。なお、比較例No.30 は、曲
げ加工をＡｃ3 点以上で、No.31 は、Ａｃ1 〜Ａｃ3 点
の温度域でそれぞれ行い、曲げ加工後の熱処理は、いず
れもＡｃ3 点以上のオーステナイト単相温度域からの焼
入れと、Ａｃ1 点以下での焼戻し処理を行つている。[4] Various properties of the pipe material Various properties of each of the test bent pipes after heat treatment were measured, and Table 1
The results shown in are obtained. Nos. 10 and 11, and Nos. 20 to 23 are invention examples, and Nos. 30 and 31 are comparative examples. Invention Example Nos. 10 and 11
Is an example in which the bending process is performed in the temperature range of Ac 3 points or more (austenite single phase region), and No. 20 to 23 are the bending processes.
c 1 Temperature range of to Ac 3 point at (ferrite austenite 2-phase region) is KoTsuta example. In Comparative Example No.30 is a bending of the Ac 3 point or more, No.31 is Ac performed 1 to Ac respectively in a temperature range of three-point bending thermal treatment after processing, either Ac or more 3 points Quenching from the austenite single-phase temperature range and tempering at an Ac 1 point or less are performed.
【００１２】[0012]
【表１】 [Table 1]
【００１３】[0013]
【表２】 [Table 2]
【００１４】表１中、No.10,11、およびNo.20,21に示し
たように、曲げ加工をＡｃ3 点以上のオーステナイト単
相温度域で行つた場合（No.10,11）、およびフェライト
・オーステナイト２相混相温度域で行つた場合(No.20,2
1)のいずれにおいても、本発明に従ってフェライト・オ
ーステナイト２相温度域からの焼入れと、７００〜７５
０℃の温度域での焼戻しの熱処理により、硬さＨｖ(10)
約２３８以下（概ね２００前後）に軟質化され、比較例
No.30,31（Ｈｖ(10)は約２４０以上）との差異は歴然で
ある。また、曲げ加工を温度８００℃前後のフェライト
・オーステナイト２相温度域で行つた場合の曲げ加工後
の熱処理は、必ずしも焼入れ・焼戻しの熱処理を行う必
要はなく、No.22 およびNo.23 に示したように、７００
〜７５０℃の温度域に加熱保持した後、空冷するだけの
熱処理で十分に軟質化されることがわかる。曲げ加工後
の熱処理により軟質化された発明例の曲げ管は、伸び
（Ｅｌ）、絞り（ＲＡ）、および衝撃吸収エネルギ（v
Ｅ10）が高く、高度の延靱性を有し、かつ４２．２ｋｇ
／ｍｍ2 を越える降伏点を有すると共に、約０．８以下
の低降伏比を備えている。As shown in Nos. 10 and 11 and Nos. 20 and 21 in Table 1, when bending is performed in the austenite single-phase temperature range of Ac 3 points or more (Nos. 10 and 11), And ferrite / austenite two-phase mixed phase temperature range (No. 20,2)
In any one of 1), according to the present invention, quenching from the ferrite-austenite two-phase temperature range, 700-75
Hardness Hv (10) by tempering heat treatment in the temperature range of 0 ℃
Comparative example softened to about 238 or less (about 200)
The difference with No.30 and 31 (Hv (10) is about 240 or more) is obvious. In addition, the heat treatment after bending when bending is performed in the temperature range of ferrite / austenite two-phase temperature around 800 ℃ does not necessarily require quenching and tempering, and is shown in No.22 and No.23. Like, 700
It can be seen that after heat-holding in the temperature range of up to 750 ° C., it is sufficiently softened by the heat treatment of only air cooling. The bent pipe of the invention example softened by the heat treatment after bending has elongation (El), drawing (RA), and impact absorption energy ( v
E 10) is high, a high degree of extension toughness and 42.2kg
It has a yield point in excess of / mm 2 and a low yield ratio of about 0.8 or less.
【００１５】[0015]
【発明の効果】本発明によれば、高周波曲げ加工後の熱
処理により、適度に軟質化された１３クロム系マルテン
サイト型ステンレス鋼からなる曲げ管を製造することが
できる。その曲げ管は、適度に軟質化され、良好な延性
・靱性を有すると共に、強度も高く、しかも構造材料と
して望まれる低降伏比を備えている。本発明により製造
される曲げ管は、石油・天然ガス生産井のサワー油井や
スウィート油井等の配管材として有用であり、その改良
された材料特性により、配管構築に必要な溶接性も良好
であり、また実使用においてはＨ2 侵入による応力腐食
割れに対する抵抗性等も改善される。EFFECTS OF THE INVENTION According to the present invention, it is possible to manufacture a bent tube made of 13 chromium-based martensite type stainless steel which is appropriately softened by heat treatment after high frequency bending. The bent tube is appropriately softened, has good ductility and toughness, has high strength, and has a low yield ratio desired as a structural material. The bent pipe produced by the present invention is useful as a piping material for sour oil wells and sweet oil wells of oil / natural gas production wells, and due to its improved material properties, the weldability required for pipe construction is also good. Moreover, in actual use, the resistance to stress corrosion cracking due to H 2 penetration is also improved.
Claims (2)
を、温度約８００〜８５０℃、または温度９５０〜１０
５０℃で高周波曲げ加工した後、温度８００〜８５０℃
に加熱保持して同温度から焼入れし、ついで７００〜７
５０℃の温度域に加熱保持した後、空冷する焼戻しを行
うことを特徴とする１３クロム系ステンレス鋼曲げ管の
製造方法。1. A centrifugal force casting tube made of 13 chromium stainless steel is provided at a temperature of about 800 to 850 ° C. or a temperature of 950 to 10 ° C.
After high-frequency bending at 50 ° C, the temperature is 800-850 ° C.
And hold it at the same temperature for quenching, then 700 ~ 7
A method for producing a 13 chromium-based stainless steel bent pipe, which comprises performing heating and holding in a temperature range of 50 ° C. and then tempering by air cooling.
を、温度約８００〜８５０℃で高周波曲げ加工した後、
７００〜７５０℃の温度域に加熱保持し、空冷すること
を特徴とする１３クロム系ステンレス鋼曲げ管の製造方
法。2. A centrifugal casting pipe made of 13 chromium stainless steel is subjected to high frequency bending at a temperature of about 800 to 850 ° C.,
A method for producing a 13 chromium-based stainless steel bent pipe, which comprises heating and holding in a temperature range of 700 to 750 ° C., followed by air cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19192493A JPH0718331A (en) | 1993-07-05 | 1993-07-05 | Manufacture of 13 chromium stainless steel bent tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19192493A JPH0718331A (en) | 1993-07-05 | 1993-07-05 | Manufacture of 13 chromium stainless steel bent tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0718331A true JPH0718331A (en) | 1995-01-20 |
Family
ID=16282712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19192493A Pending JPH0718331A (en) | 1993-07-05 | 1993-07-05 | Manufacture of 13 chromium stainless steel bent tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0718331A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6406800B1 (en) * | 2000-02-02 | 2002-06-18 | Kubota Corporation | Bent pipe for passing therethrough a material containing solids |
| EP2128278A1 (en) * | 2007-03-26 | 2009-12-02 | Sumitomo Metal Industries Limited | Process for producing bend pipe for line pipe and bend pipe for line pipe |
| CN104480278A (en) * | 2014-12-24 | 2015-04-01 | 江苏隆盛钻采机械制造有限公司 | Thermal processing process for oil casing pup joint |
| CN104942106A (en) * | 2015-06-16 | 2015-09-30 | 沧州隆泰迪管道科技有限公司 | Novel bent pipe heater |
| CN106702125A (en) * | 2017-01-23 | 2017-05-24 | 江苏顺通管业有限公司 | Heat treatment method for metal elbow |
-
1993
- 1993-07-05 JP JP19192493A patent/JPH0718331A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6406800B1 (en) * | 2000-02-02 | 2002-06-18 | Kubota Corporation | Bent pipe for passing therethrough a material containing solids |
| EP2128278A1 (en) * | 2007-03-26 | 2009-12-02 | Sumitomo Metal Industries Limited | Process for producing bend pipe for line pipe and bend pipe for line pipe |
| US8038811B2 (en) * | 2007-03-26 | 2011-10-18 | Sumitomo Metal Industries, Ltd. | Process for producing bent pipe for line pipe |
| EP2128278B1 (en) * | 2007-03-26 | 2016-08-10 | Nippon Steel & Sumitomo Metal Corporation | Process for producing bend pipe for line pipe and bend pipe for line pipe |
| CN104480278A (en) * | 2014-12-24 | 2015-04-01 | 江苏隆盛钻采机械制造有限公司 | Thermal processing process for oil casing pup joint |
| CN104942106A (en) * | 2015-06-16 | 2015-09-30 | 沧州隆泰迪管道科技有限公司 | Novel bent pipe heater |
| CN106702125A (en) * | 2017-01-23 | 2017-05-24 | 江苏顺通管业有限公司 | Heat treatment method for metal elbow |
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