JP3241263B2 - Manufacturing method of high strength duplex stainless steel pipe - Google Patents
Manufacturing method of high strength duplex stainless steel pipeInfo
- Publication number
- JP3241263B2 JP3241263B2 JP08090696A JP8090696A JP3241263B2 JP 3241263 B2 JP3241263 B2 JP 3241263B2 JP 08090696 A JP08090696 A JP 08090696A JP 8090696 A JP8090696 A JP 8090696A JP 3241263 B2 JP3241263 B2 JP 3241263B2
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- Prior art keywords
- stainless steel
- duplex stainless
- steel pipe
- temperature
- strength
- 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 Steel (AREA)
- Heat Treatment Of Articles (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、常温でオーステ
ナイト相とフェライト相の二相を呈する二相ステンレス
鋼管、特に耐食性、耐応力腐食割れ性（以下耐ＳＣＣ性
という）、耐硫化物割れ性（以下耐ＳＳＣ性という）に
優れた高強度二相ステンレス鋼管の製造方法に関する。BACKGROUND OF THE INVENTION The present invention relates to a duplex stainless steel tube exhibiting two phases of an austenitic phase and a ferrite phase at normal temperature, especially corrosion resistance, stress corrosion cracking resistance (hereinafter referred to as SCC resistance), and sulfide cracking resistance (hereinafter referred to as SCC resistance). (Hereinafter referred to as SSC resistance).
【０００２】[0002]
【従来の技術】近年の油井や天然ガス井は、近い将来に
予想される石油資源の枯渇化を目前にして、従来は顧み
られなかったような深層油田の発掘や、一旦開発が放棄
されたサワーガス田などに対する再開発が世界的規模で
盛んに行われている。このような油井、ガス井は、一般
に深度が極めて深く、また、その雰囲気はＨ2Ｓ、Ｃ
Ｏ2、Ｃｌ-等を含有する湿潤下の極めて厳しい腐食環境
下にあり、生産される石油、天然ガス中には、Ｈ2Ｓを
含む場合が非常に多くなっている。このような大深度で
腐食環境下の油井や天然ガス井においては、高強度で、
かつ耐食性、耐ＳＣＣ性ならびに耐ＳＳＣ性に優れた鋼
管が要望される。2. Description of the Related Art In recent years, oil and natural gas wells have been deprived of petroleum resources, which are expected in the near future. Redevelopment of sour gas fields and the like is being actively carried out on a global scale. Such oil wells and gas wells are generally extremely deep, and the atmosphere is H 2 S, C
It is in a very severe corrosive environment under moisture containing O 2 , Cl- and the like, and H 2 S is very often contained in the produced oil and natural gas. In such deep and corrosive oil and natural gas wells, high strength
Further, a steel pipe excellent in corrosion resistance, SCC resistance and SSC resistance is demanded.
【０００３】前記大深度で腐食環境下の油井や天然ガス
井においては、常温でオーステナイト相とフェライト相
の二相を呈する二相ステンレス鋼管が採用されている。
常温でオーステナイト相とフェライト相の二相を呈する
二相ステンレス鋼管は、通常熱間加工したのち空冷され
るため、Ｃｒ炭窒化物、σ相等の金属間化合物が生成す
る。このため、二相ステンレス鋼管は、Ｃｒ炭窒化物、
σ相等の金属間化合物を溶体化する熱処理を行ってい
る。その場合二相ステンレス鋼管は、製管後空冷される
ため、発生する金属間化合物等の影響によって材料が脆
くなり、ハンドリングに注意を要し、強度的に降伏応力
が６５〜８０ｋｓｉ（４４６〜５４９Ｎ／ｍｍ2）と十
分に高いとは云えず、深井戸用油井管としての高強度を
得るためには、冷間加工を施さなければならない。しか
し、この方法では、一度製管したのち、空冷、熱処理、
冷間加工という工程を経るため、コストが高くなると共
に、生産性の点からも満足できるものではない。[0003] In an oil well or a natural gas well under a corrosive environment at a large depth, a duplex stainless steel pipe exhibiting two phases of an austenite phase and a ferrite phase at normal temperature is employed.
A duplex stainless steel pipe exhibiting two phases of an austenitic phase and a ferrite phase at normal temperature is usually hot-worked and then air-cooled, so that intermetallic compounds such as Cr carbonitride and σ phase are generated. For this reason, the duplex stainless steel pipe is made of Cr carbonitride,
Heat treatment for solutionizing intermetallic compounds such as the σ phase is performed. In this case, since the duplex stainless steel pipe is air-cooled after the pipe is made, the material becomes brittle due to the influence of the generated intermetallic compound and the like, and care must be taken in handling, and the yield stress is 65 to 80 ksi (446 to 549 N) in terms of strength. / Mm 2 ), which is not sufficiently high, and must be cold worked in order to obtain high strength as a deep well oil country tubular good. However, in this method, once the tube is made, air cooling, heat treatment,
Since it goes through a process called cold working, the cost increases and it is not satisfactory in terms of productivity.
【０００４】近年、二相ステンレス鋼管の前記欠点を解
消する方法としては、所定化学成分の二相ステンレス鋼
管をストレッチレジューサにより縮径圧延する工程を有
してなる二相ステンレス鋼油井管の製造方法において、
前記縮径圧延前に前記二相ステンレス鋼管を９００〜１
１５０℃に加熱する工程と、前記加熱工程後７５０〜１
０００℃の仕上げ温度で縮径圧延する工程と、前記縮径
圧延直後水もしくはミストにより急冷する工程とを有す
る方法（特開昭５９−１８２９１８号公報）、二相ステ
ンレス鋼を１０００℃以上の温度に加熱して熱間加工を
行い、熱間加工後そのままの状態で８００℃以上の温度
から急冷処理する方法（特開昭６０−８９５１９号公
報）、二相ステンレス鋼を加熱後穿孔圧延機で穿孔し、
延伸圧延機で延伸加工を施したのち、再加熱し絞り圧延
機で絞り圧延を施す一連の工程によって継目無鋼管を製
造するに際し、再加熱後の縮管加工率Ｒｎ（％）と縮管
加工後の材料温度Ｔｍ（℃）との関係を、９８０＋２Ｒ
ｎ≦Ｔｍ≦１２５０（℃）として絞り圧延する方法（特
開平１−１２３０２６号公報）等が提案されている。In recent years, as a method of solving the above-mentioned disadvantages of a duplex stainless steel pipe, a method of manufacturing a duplex stainless steel oil country tubular good comprising a step of reducing the diameter of a duplex stainless steel pipe having a predetermined chemical composition by a stretch reducer. At
Before the diameter reduction rolling, the duplex stainless steel pipe is 900 to 1
Heating to 150 ° C. and 750 to 1 after the heating step
A method including a step of rolling at a finishing temperature of 000 ° C. and a step of quenching with water or mist immediately after the diameter reducing rolling (JP-A-59-182918); Hot-working, followed by quenching from a temperature of 800 ° C. or more after hot working (Japanese Patent Laid-Open No. 60-89519). Pierce and
After producing a seamless steel pipe by a series of steps of performing elongation processing by an elongation rolling mill, reheating and reducing by a reduction rolling machine, a reduction ratio Rn (%) and a reduction ratio of the reduced tube after reheating are produced. The relationship with the subsequent material temperature Tm (° C.) is 980 + 2R
A method of drawing and rolling with n ≦ Tm ≦ 1250 (° C.) (Japanese Unexamined Patent Publication No. 1-123026) has been proposed.
【０００５】[0005]
【発明が解決しようとする課題】上記特開昭５９−１８
２９１８号公報、特開昭６０−８９５１９号公報および
特開平１−１２３０２６号公報に開示の方法は、いずれ
も圧延加工時の加熱温度および仕上げ温度を規定するも
のであり、仮に最終加工後、急冷処理がなされたとして
も、急冷前の温度コントロールを厳密にするのは困難で
あり、ある程度のバラツキの範囲となるため、その材料
に最も適した（強度、耐食性、フェライト／オーステナ
イトバランス）溶体化温度を選択することはできない。
また、最終加工後、急冷処理しても歪が多く導入されて
いると、σ相等の金属間化合物が析出し易くなり、十分
な性能は得られない。SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 59-18 / 1984
The methods disclosed in Japanese Patent No. 2918, Japanese Patent Application Laid-Open No. 60-89519 and Japanese Patent Application Laid-Open No. 1-123026 each specify a heating temperature and a finishing temperature during rolling, and tentatively cool after final processing. Even after the treatment, it is difficult to strictly control the temperature before quenching, and the temperature is within a certain range, so the solution temperature (strength, corrosion resistance, ferrite / austenite balance) most suitable for the material is used. Cannot be selected.
Further, if a large amount of strain is introduced even after quenching after the final processing, intermetallic compounds such as the σ phase are likely to precipitate, and sufficient performance cannot be obtained.
【０００６】この発明の目的は、上記従来技術の欠点を
解消し、二相ステンレス鋼で比較的σ相等の金属間化合
物が析出し易く、溶体化温度等を詳細に規定する必要の
ある材料において、最適な溶体化温度を設定できる高強
度二相ステンレス鋼管の製造方法を提供することにあ
る。An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and to provide a duplex stainless steel in which an intermetallic compound such as a σ phase is relatively easy to precipitate and a solution temperature and the like must be defined in detail. Another object of the present invention is to provide a method of manufacturing a high-strength duplex stainless steel pipe capable of setting an optimum solution temperature.
【０００７】[0007]
【課題を解決するための手段】本発明者らは、上記目的
を達成すべく従来から実施されている二相ステンレス鋼
管の溶体化熱処理工程を省略すべく検討を行った結果、
最終圧延を終了した二相ステンレス鋼管の温度Ｔ（℃）
が、８００＋５Ｃｒ（％）＋２５Ｍｏ（％）＋１５Ｗ
（％）≦Ｔ≦１１５０を満足するよう再加熱して溶体化
処理したのち、急冷処理することによって、優れた耐食
性を有し、かつ高強度二相ステンレス鋼管を製造できる
ことを究明し、この発明に到達した。Means for Solving the Problems The present inventors have studied to omit the solution heat treatment step of a duplex stainless steel pipe which has been conventionally performed to achieve the above object.
Temperature T (° C) of duplex stainless steel pipe after final rolling
Is 800 + 5Cr (%) + 25Mo (%) + 15W
(%) ≦ T ≦ 1150, re-heated, solution-treated, and then quenched to find out that a high-strength duplex stainless steel tube having excellent corrosion resistance and high strength can be manufactured. Reached.
【０００８】すなわちこの発明は、常温でオーステナイ
ト相とフェライト相の二相を呈する二相ステンレス鋼を
１１００℃以上に加熱したのち、熱間加工を施して高強
度二相ステンレス鋼管を製造する方法において、最終圧
延終了後直ちに二相ステンレス鋼継目無鋼管の温度Ｔ
（℃）が下記（１）式を満足するよう再加熱して溶体化
処理したのち、急冷処理することを特徴とする高強度二
相ステンレス鋼管の製造方法である。 ８００＋５Ｃｒ（％）＋２５Ｍｏ（％）＋１５Ｗ（％）≦Ｔ≦１１５０…（１ ）式That is, the present invention relates to a method for producing a high-strength duplex stainless steel pipe by heating a duplex stainless steel exhibiting two phases of an austenite phase and a ferrite phase at room temperature to 1100 ° C. or more and then performing hot working. , Final pressure
Immediately after the end of rolling, the temperature T of the duplex stainless steel seamless steel pipe
This is a method for producing a high-strength duplex stainless steel pipe characterized by reheating and solution-treating so that (° C.) satisfies the following formula (1), followed by quenching. 800 + 5Cr (%) + 25Mo (%) + 15W (%) ≦ T ≦ 1150 ... (1)
【０００９】[0009]
【発明の実施の形態】常温でオーステナイト相とフェラ
イト相の二相を呈する二相ステンレス鋼は、熱間加工を
したのちそのまま急冷すると、強度、耐食性の面から最
適な溶体化温度に保持することはできないが、熱間加工
工程の直後に加熱工程を設けることによって、最適な溶
体化温度に保持することができ、かつ最適な溶体化温度
から急冷処理が可能となり、高強度高耐食性二相ステン
レス鋼管を製造することができる。BEST MODE FOR CARRYING OUT THE INVENTION Duplex stainless steel, which exhibits two phases of an austenitic phase and a ferrite phase at normal temperature, can be maintained at an optimal solution temperature from the viewpoints of strength and corrosion resistance by being rapidly cooled after hot working. However, by providing a heating step immediately after the hot working step, it is possible to maintain the optimal solution temperature, and to enable rapid cooling from the optimal solution temperature. Steel pipes can be manufactured.
【００１０】熱間加工終了後の二相ステンレス鋼管の加
熱温度は、σ相、Ｃｒ炭窒化物等による耐食性、靭性の
劣化を考慮して上下限を設定する必要がある。そこで種
々の化学成分の二相ステンレス鋼を溶製し、マンネスマ
ンミルによって熱間製管し、熱間製管後の加熱炉の温度
を８００〜１２００℃まで変化させた二相ステンレス鋼
管を製造した。そして得られた各二相ステンレス鋼管
は、靭性および耐食性を調査し、得られた結果を基に回
帰分析を行った結果、前記（１）式を得た。その結果を
図１に示す。It is necessary to set upper and lower limits of the heating temperature of the duplex stainless steel pipe after the completion of the hot working in consideration of deterioration of corrosion resistance and toughness due to σ phase, Cr carbonitride and the like. Therefore, duplex stainless steels of various chemical components were melted, hot-pipe-formed by a Mannesman mill, and duplex-pipe stainless steel pipes in which the temperature of the heating furnace after the hot pipe was changed from 800 to 1200 ° C were manufactured. . Each of the obtained duplex stainless steel pipes was examined for toughness and corrosion resistance, and regression analysis was performed based on the obtained results. As a result, the above equation (1) was obtained. The result is shown in FIG.
【００１１】図１に示すとおり、Ｃｒ、Ｍｏ、Ｗ量が増
加すると、σ相等の金属間化合物、炭窒化物が析出し易
くなるため、高温での溶体化処理が必要となる。一方、
耐食性は、良好となる最適なフェライトとオーステナイ
トのバランスが存在し、Ｃｒ、Ｍｏ、Ｗ量が増加するに
したがって高温側へと移行する。しかし、溶体化処理
は、温度を上げすぎると、加工時の歪が除去されて高強
度が得られず、また、フェライトとオーステナイトのバ
ランスを崩すばかりでなく、結晶粒の粗大化が始まり靭
性の劣化を招くので、上限は１１５０℃に設定する必要
がある。As shown in FIG. 1, when the amounts of Cr, Mo, and W increase, intermetallic compounds such as the σ phase and carbonitride tend to precipitate, so that a solution treatment at a high temperature is required. on the other hand,
As for the corrosion resistance, there is an optimum balance between ferrite and austenite which is good, and the corrosion resistance shifts to a higher temperature side as the amounts of Cr, Mo and W increase. However, in the solution treatment, if the temperature is too high, strain during processing is removed and high strength is not obtained, and not only the balance between ferrite and austenite is lost, but the coarsening of crystal grains starts and toughness The upper limit needs to be set to 1150 ° C. because it causes deterioration.
【００１２】熱間加工終了後の二相ステンレス鋼管の加
熱時の均熱時間は、製管後析出するσ相等の金属間化合
物は少量であり、二相ステンレス鋼管の温度Ｔ＝８００
＋５Ｃｒ（％）＋２５Ｍｏ（％）＋１５Ｗ（％）以上で
あれば、短時間の加熱で十分固溶する。したがって、加
熱時の均熱時間は、１分以上あれば問題なく、余り長時
間加熱すると強度が低下するので、上限は１時間程度で
ある。The soaking time during heating of the duplex stainless steel pipe after the completion of hot working is such that a small amount of intermetallic compound such as σ phase precipitates after pipe production, and the temperature T = 800 of the duplex stainless steel pipe.
If it is + 5Cr (%) + 25Mo (%) + 15W (%) or more, a sufficient solid solution can be obtained by heating for a short time. Therefore, the soaking time for heating is 1 minute or more without any problem, and if the heating is performed for an excessively long time, the strength decreases.
【００１３】[0013]
実施例１ 表１に示す化学成分のＡ〜Ｃの常温でオーステナイト相
とフェライト相の二相を呈する二相ステンレス鋼を溶製
し、連続鋳造によって外径１８７．０ｍｍのビレットを
作製し、マンネスマン−マンドレルミルによって熱間圧
延を行い、外径１３９．７ｍｍ、肉厚９．５２ｍｍの二
相ステンレス鋼管を製造した。熱間圧延後直ちに加熱炉
で表２に示す加熱条件で溶体化処理を施したのち、水冷
した本発明の二相ステンレス鋼管と、表３に示すとお
り、熱間圧延後常温まで空冷してから熱処理炉に装入し
て溶体化処理を実施した比較例ならびに熱間圧延後常温
まで水冷したままの比較例の二相ステンレス鋼管それぞ
れについて、試験片を切り出し、引張試験、シャルピー
衝撃試験、ロックウエル硬さ試験、腐食試験を実施し
た。その結果を表４に示す。Example 1 Duplex stainless steel exhibiting two phases of an austenite phase and a ferrite phase at room temperature of A to C having the chemical components shown in Table 1 was melted, and a billet having an outer diameter of 187.0 mm was produced by continuous casting. -Hot rolling was performed by a mandrel mill to produce a duplex stainless steel pipe having an outer diameter of 139.7 mm and a thickness of 9.52 mm. Immediately after the hot rolling, a solution treatment was performed in a heating furnace under the heating conditions shown in Table 2, and then the water-cooled duplex stainless steel pipe of the present invention and, as shown in Table 3, air-cooled to normal temperature after hot rolling. A test piece was cut out from each of the duplex stainless steel pipes of the comparative example in which the solution treatment was performed in the heat treatment furnace and the water-cooled room temperature after hot rolling, and a tensile test, a Charpy impact test, and a Rockwell hardness test were performed. And a corrosion test. Table 4 shows the results.
【００１４】なお、引張試験は、幅２５．４ｍｍ、平行
部長さ５０．８ｍｍのＡＰＩ（Ａｍｅｒｉｃａｎ Ｐｅ
ｔｒｏｌｅｕｍ Ｉｎｓｔｉｔｕｔｅ）規格の円弧状試
験片を用い、ＪＩＳ Ｚ ２２４１に規定の金属材料引
張試験方法に準じて実施し、降伏強さ（ＹＳ）を求め
た。また、シャルピー衝撃試験は、厚さ５ｍｍ、幅１０
ｍｍ、長さ５５ｍｍ、切り欠き部深さ２ｍｍのＪＩＳ
Ｚ ２２０２に規定の金属材料衝撃試験片の４号試験片
を用い、ＪＩＳ Ｚ ２２４２に規定の金属材料衝撃試
験方法に準じて−３０℃で実施し、吸収エネルギーを求
めた。さらに、ロックウエル硬さは、ＪＩＳ Ｚ ２２
４５に規定のロックウエル硬さ試験方法に準じてロック
ウエル硬さＣにより測定した。さらにまた、腐食試験
は、厚さ３ｍｍ、幅３０ｍｍ、長さ５０ｍｍの試験片を
用い、ＡＳＴＭ Ｇ４８ＭｅｔｈｏｄＡに準じて２５℃
から孔食が発生するまで５℃ピッチで温度を上昇させて
ゆき、孔食の発生した温度を臨界孔食発生温度ＣＰＴと
した。In the tensile test, an API (American Pe) having a width of 25.4 mm and a parallel part length of 50.8 mm was used.
The yield strength (YS) was determined using an arc-shaped test piece conforming to the trolleum Institute (troleum Institute) standard in accordance with the metal material tensile test method specified in JIS Z 2241. The Charpy impact test showed a thickness of 5 mm and a width of 10 mm.
mm, length 55mm, notch depth 2mm JIS
Using the No. 4 test piece of the metal material impact test specimen specified in Z2202, the test was performed at −30 ° C. according to the metal material impact test method specified in JIS Z2242, and the absorbed energy was obtained. Furthermore, Rockwell hardness is JIS Z 22
It was measured according to Rockwell hardness C according to the Rockwell hardness test method specified in 45. Further, the corrosion test was performed using a test piece having a thickness of 3 mm, a width of 30 mm, and a length of 50 mm at 25 ° C. in accordance with ASTM G48 Method A.
The temperature was increased at a pitch of 5 ° C. until pitting occurred, and the temperature at which pitting occurred was defined as the critical pitting occurrence temperature CPT.
【００１５】[0015]
【表１】 [Table 1]
【００１６】[0016]
【表２】 [Table 2]
【００１７】[0017]
【表３】 [Table 3]
【００１８】[0018]
【表４】 [Table 4]
【００１９】表４に示すとおり、試験Ｎｏ．１〜１０の
本発明例の二相ステンレス鋼管は、いずれも熱間製管後
直ちに加熱炉に装入して加熱し、最適な溶体化温度で溶
体化処理を施したのち、水冷により急冷されたため、高
強度で、かつ高耐食性を有している。これに対し、試験
Ｎｏ．１１、１３の比較例の二相ステンレス鋼管は、い
ずれも熱間製管後、常温まで空冷したのち、溶体化処理
のため再度加熱して溶体化処理したため、降伏強さが５
２０Ｎ／ｍｍ2以下となり、鋼種Ｃの試験Ｎｏ．１５の
比較例においても、鋼種Ｃの試験Ｎｏ．８〜１０の本発
明例に比べ、降伏強さが劣っており、高強度化が図られ
ていない。また、試験Ｎｏ．１２、１４、１６の比較例
の二相ステンレス鋼管は、いずれも熱間製管後加熱炉に
装入することなく、そのまま水冷により急冷したため、
高強度化が図られているものの、最適な溶体化温度から
の急冷でないので、靭性および耐食性が劣っている。As shown in Table 4, Test No. Each of the duplex stainless steel pipes of Examples 1 to 10 of the present invention was immediately charged into a heating furnace after hot pipe making, heated, subjected to a solution treatment at an optimal solution temperature, and quenched by water cooling. Therefore, it has high strength and high corrosion resistance. On the other hand, Test No. The duplex stainless steel pipes of Comparative Examples 11 and 13 were both hot-formed, air-cooled to room temperature, and then heated again for solution treatment and solution treatment.
20 N / mm 2 or less. Also in Comparative Example No. 15, Test No. The yield strength is inferior to that of the inventive examples 8 to 10, and the high strength is not achieved. Test No. The duplex stainless steel pipes of Comparative Examples 12, 14, and 16 were all rapidly cooled by water cooling without being charged into a heating furnace after hot pipe production.
Although high strength has been achieved, the toughness and corrosion resistance are inferior because it is not quenched from the optimal solution temperature.
【００２０】[0020]
【発明の効果】以上述べたとおり、この発明方法によれ
ば、熱間圧延後直ちに加熱炉に装入してその材料に最適
な溶体化温度を確保して、急冷処理するため、製管時の
歪が残留して高強度で、かつ高耐食性を有する二相ステ
ンレス鋼管を、安価にかつ高生産性で製造でき、油井
管、ラインパイプ用として使用することができる。As described above, according to the method of the present invention, immediately after hot rolling, it is charged into a heating furnace to secure an optimal solution temperature for the material and to perform rapid cooling treatment. A high-strength, high-corrosion-resistant duplex stainless steel pipe can be manufactured at low cost and with high productivity, and can be used for oil country tubular goods and line pipes.
【図１】二相ステンレス鋼管の材質と溶体化温度との関
係による耐食性、靭性の変化を示すグラフである。FIG. 1 is a graph showing changes in corrosion resistance and toughness depending on the relationship between the material of a duplex stainless steel pipe and the solution temperature.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C21D 8/00 - 8/10 C21D 9/08 C22C 38/00 - 38/60 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) C21D 8/00-8/10 C21D 9/08 C22C 38/00-38/60
Claims (1)
の二相を呈する二相ステンレス鋼を１１００℃以上に加
熱したのち、熱間加工を施して高強度二相ステンレス鋼
継目無鋼管を製造する方法において、最終圧延終了後直
ちに二相ステンレス鋼管の温度Ｔ（℃）が下記（１）式
を満足するよう再加熱して溶体化処理したのち、急冷処
理することを特徴とする高強度二相ステンレス鋼管の製
造方法。 ８００＋５Ｃｒ（％）＋２５Ｍｏ（％）＋１５Ｗ（％）≦Ｔ≦１１５０…（１ ）式1. A method for producing a high-strength duplex stainless steel seamless steel pipe by heating a duplex stainless steel exhibiting two phases of an austenite phase and a ferrite phase at room temperature to 1100 ° C. or higher, and then performing hot working. , the final rolling after the end of the straight
A method for producing a high-strength duplex stainless steel pipe, comprising reheating and solution-treating the duplex stainless steel pipe so that the temperature T (° C.) satisfies the following formula (1), followed by quenching. 800 + 5Cr (%) + 25Mo (%) + 15W (%) ≦ T ≦ 1150 ... (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08090696A JP3241263B2 (en) | 1996-03-07 | 1996-03-07 | Manufacturing method of high strength duplex stainless steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08090696A JP3241263B2 (en) | 1996-03-07 | 1996-03-07 | Manufacturing method of high strength duplex stainless steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09241746A JPH09241746A (en) | 1997-09-16 |
| JP3241263B2 true JP3241263B2 (en) | 2001-12-25 |
Family
ID=13731430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08090696A Expired - Fee Related JP3241263B2 (en) | 1996-03-07 | 1996-03-07 | Manufacturing method of high strength duplex stainless steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3241263B2 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL161289A0 (en) * | 2001-10-30 | 2004-09-27 | Ati Properties Inc | Duplex stainless steels |
| JP4265605B2 (en) * | 2003-06-30 | 2009-05-20 | 住友金属工業株式会社 | Duplex stainless steel |
| MX2008012238A (en) * | 2007-03-26 | 2008-11-28 | Sumitomo Metal Ind | Oil well pipe for expansion in well and two-phase stainless steel for use as oil well pipe for expansion. |
| JP5211841B2 (en) | 2007-07-20 | 2013-06-12 | 新日鐵住金株式会社 | Manufacturing method of duplex stainless steel pipe |
| KR101587392B1 (en) | 2007-11-29 | 2016-01-21 | 에이티아이 프로퍼티즈, 인코퍼레이티드 | Lean austenitic stainless steel |
| WO2009082501A1 (en) | 2007-12-20 | 2009-07-02 | Ati Properties, Inc. | Corrosion resistant lean austenitic stainless steel |
| US8337749B2 (en) | 2007-12-20 | 2012-12-25 | Ati Properties, Inc. | Lean austenitic stainless steel |
| DK2245202T3 (en) | 2007-12-20 | 2011-12-19 | Ati Properties Inc | Low nickel Austenitic stainless steel containing stabilizing elements |
| JP5018863B2 (en) * | 2009-11-13 | 2012-09-05 | 住友金属工業株式会社 | Duplex stainless steel with excellent alkali resistance |
| JP5088455B2 (en) | 2011-03-10 | 2012-12-05 | 住友金属工業株式会社 | Duplex stainless steel |
| JP6303851B2 (en) * | 2014-06-18 | 2018-04-04 | 新日鐵住金株式会社 | Duplex stainless steel pipe |
-
1996
- 1996-03-07 JP JP08090696A patent/JP3241263B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09241746A (en) | 1997-09-16 |
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