JPH0796390A - Wire for welding 9cr-1mo steel - Google Patents
Wire for welding 9cr-1mo steelInfo
- Publication number
- JPH0796390A JPH0796390A JP26562993A JP26562993A JPH0796390A JP H0796390 A JPH0796390 A JP H0796390A JP 26562993 A JP26562993 A JP 26562993A JP 26562993 A JP26562993 A JP 26562993A JP H0796390 A JPH0796390 A JP H0796390A
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- JP
- Japan
- Prior art keywords
- welding
- steel
- wire
- strength
- toughness
- 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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- Nonmetallic Welding Materials (AREA)
- Arc Welding In General (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、９Ｃr−１Ｍo鋼を溶接
母材として、高温強度特性と靭性が優れた溶接部を与え
るための溶接ワイヤに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding wire for using 9Cr-1Mo steel as a welding base material to provide a weld having excellent high temperature strength characteristics and toughness.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】ボイラ
ーのような高温高圧で操業される機器は、熱効率を高め
るため、操業時の温度圧力をより高めようとする改良が
行われている。このような要求に対して、機器材料とし
て各種９％Ｃr鋼や１０〜１２％Ｃr鋼があり、また、こ
れらの鋼種に対して既に多くの溶接材料が提案されてい
る。2. Description of the Related Art Equipment such as a boiler which is operated at high temperature and high pressure has been improved in order to increase the temperature and pressure during operation in order to improve thermal efficiency. In response to such requirements, there are various 9% Cr steels and 10 to 12% Cr steels as equipment materials, and many welding materials have already been proposed for these steel types.
【０００３】特に９Ｃr−１Ｍo鋼はその優れた特性が認
められ、既に多くの実績があり、この鋼種に対する各種
の溶接材料も使用されており、また例えば、特開平１−
１１０９２号、特開平１−２５８８９４号、特開平２−
３７９８９号等が既に提案されている。しかし、これら
の提案では、個々の成分の働きのみを検討しているか、
或いは組み合わせを検討していても不十分で、未だ十分
な特性を示す溶接ワイヤとは言い難い。鋼材の進歩に伴
って、溶接材料に対しても、より高性能の特性が求めら
れており、特に高温におけるクリープと靭性を同時に満
足する溶接部を与える溶接材料が望まれているのが現状
である。In particular, 9Cr-1Mo steel has been recognized for its excellent properties and has a large number of achievements, and various welding materials have been used for this steel type.
11092, JP-A-1-258894, JP-A-2-
No. 37989 has already been proposed. However, do these proposals only consider the function of the individual components?
Alternatively, it is not enough to consider a combination, and it is hard to say that the welding wire still has sufficient characteristics. With the progress of steel materials, higher performance characteristics are required for welding materials as well, and in particular, the present situation is that welding materials that can provide welds that simultaneously satisfy creep and toughness at high temperatures are desired. is there.
【０００４】本発明は、かゝる状況のもとで、９Ｃr−
１Ｍo鋼用として十分な高温強度特性(高クリープ強度)
を有すると共に、靭性も満足する溶接金属を与えること
ができる溶接ワイヤを提供することを目的としている。Under the circumstances, the present invention provides a 9Cr-
Sufficient high temperature strength characteristics for 1Mo steel (high creep strength)
It is an object of the present invention to provide a welding wire which can provide a weld metal which has satisfactory toughness as well as.
【０００５】[0005]
【課題を解決するための手段】９Ｃr−１Ｍo鋼に対し
て、高強度、高靭性の溶接部を得るためには、フェライ
ト量の析出を抑え、強度と靭性のバランスを考慮するこ
とが必要であり、このような観点から本発明者は種々検
討した結果、成分の含有量を規制すると共に特定の主要
成分を関係式で調整することにより可能であることを見
い出したものである。[Means for Solving the Problems] In order to obtain a welded portion having high strength and high toughness with respect to 9Cr-1Mo steel, it is necessary to suppress precipitation of ferrite and to consider the balance between strength and toughness. From this point of view, the present inventor has conducted various studies and found that it is possible by regulating the content of components and adjusting specific main components by a relational expression.
【０００６】すなわち、本発明は、Ｃ：０.０３〜０.１
８％、Ｓi：０.０６〜０.８０％、Ｍn：０.８５〜２.０
０％、Ｃr：８.００〜１１.０％、Ｍo：０.８０〜１.２
０％、Ｎi：０.０３〜１.００％、Ｎb：０.０１０〜０.
２５０％、Ｖ：０.０２〜０.５０％、Ｎ：０.０２６〜
０.１０％、Ｏ：０.００２〜０.０３０％、を含有し、
Ａlは０.０２０％以下に制限し、更に、Ｍn＋２Ｎi−１
０Ｎ：３.００％以下、を満足し、必要に応じて、更に Ｔa：０.００２〜０.２５０％ を含有し、残部がＦe及び不可避的不純物であることを
特徴とする９Ｃr−１Ｍo鋼溶接用ワイヤを要旨としてい
る。That is, according to the present invention, C: 0.03 to 0.1.
8%, Si: 0.06 to 0.80%, Mn: 0.85 to 2.0
0%, Cr: 8.00 to 11.0%, Mo: 0.80 to 1.2
0%, Ni: 0.03 to 1.00%, Nb: 0.010 to 0.0.
250%, V: 0.02 to 0.50%, N: 0.026 to
0.10%, O: 0.002-0.030%,
Al is limited to 0.020% or less, and Mn + 2Ni-1
0N: 3.0% or less, 9Cr-1Mo steel characterized by containing Ta: 0.002 to 0.250% as necessary, with the balance being Fe and inevitable impurities. The main points are welding wires.
【０００７】[0007]
【作用】以下に本発明における溶接ワイヤの各成分の限
定理由を説明する。The reason for limiting each component of the welding wire in the present invention will be described below.
【０００８】Ｃ：０.０３〜０.１８％ Ｃはオーステナイト安定化元素の一つで、粗大フェライ
トの析出を抑制する効果があり、少なくとも０.０３％
以上を添加する必要がある。しかし、多すぎると溶接金
属の耐割れ性を悪化させるので、０.１８％以下に抑え
る必要がある。C: 0.03 to 0.18% C is one of the austenite stabilizing elements and has the effect of suppressing the precipitation of coarse ferrite, and at least 0.03%.
It is necessary to add the above. However, if it is too large, the crack resistance of the weld metal deteriorates, so it is necessary to suppress it to 0.18% or less.
【０００９】Ｓi：０.０６〜０.８０％ Ｓiは溶接金属の脱酸や溶接金属の濡れ性確保のために
必須の元素であり、そのためには０.０６％以上を含有
させる必要がある。しかし、０.８０％を超えると応力
除去焼鈍後のみならず、長時間の熱時効でも靭性が低下
する。Si: 0.06 to 0.80% Si is an essential element for deoxidizing the weld metal and ensuring the wettability of the weld metal. For that purpose, it is necessary to contain 0.06% or more. . However, if it exceeds 0.80%, the toughness deteriorates not only after the stress relief annealing but also for a long time thermal aging.
【００１０】Ｍn：０.８５〜２.００％ Ｍnは溶接金属の焼き入れ性を高め、強度確保の上で不
可欠な元素であり、またＣと同様、粗大フェライトの析
出を抑制する効果もある。そのためには少なくとも０.
８５％以上含有させる必要があるが、２.００％を超え
ると焼き入れ硬化性が過大となり、耐割れ性が悪化する
と共に、クリープ強度を低下させる。Mn: 0.85 to 2.00% Mn is an element essential for enhancing the hardenability of the weld metal and ensuring strength, and, like C, also has the effect of suppressing the precipitation of coarse ferrite. . For that, at least 0.
It is necessary to contain 85% or more, but if it exceeds 2.00%, the quench-hardening property becomes excessive, the crack resistance deteriorates, and the creep strength decreases.
【００１１】Ｃr：８.００〜１１.００％ Ｃrは溶接金属の耐酸化性、耐食性及び高温強度を確保
する上で不可欠な元素であり、そのためには８.００％
以上の添加が必要であるが、１１.００％を超えると粗
大なフェライトが発生しやすくなり、靭性の低下を招
く。Cr: 8.00 to 11.00% Cr is an essential element for ensuring the oxidation resistance, corrosion resistance and high temperature strength of the weld metal, and for that purpose 8.00%
The above additions are necessary, but if it exceeds 11.00%, coarse ferrite is likely to be generated, resulting in a decrease in toughness.
【００１２】Ｍo：０.８０〜１.２０％ ＭoはＣrと同様、高温強度を高めるのに有効な元素であ
り、そのためには少なくとも０.８０％添加する必要が
ある。しかし、１.２０％を超えて添加すると粗大なフ
ェライトが発生しやすくなり、靭性の低下を招くため好
ましくない。Mo: 0.80 to 1.20% Like Cr, Mo is an element effective for increasing the high temperature strength, and for that purpose, it is necessary to add at least 0.80%. However, if it is added in an amount of more than 1.20%, coarse ferrite is likely to be generated, resulting in a decrease in toughness, which is not preferable.
【００１３】Ｎi：０.０３〜１.００％ Ｎiはオーステナイト安定化元素であり、粗大フェライ
トの析出を防ぎ、靭性を安定化する上で有効な元素であ
る。この目的のためには、少なくとも０.０３％添加す
る必要があるが、１.００％を超えると高温強度特性、
特にクリープ破断強度を低下させる。Ni: 0.03 to 1.00% Ni is an austenite stabilizing element and is an element effective in preventing precipitation of coarse ferrite and stabilizing toughness. For this purpose, it is necessary to add at least 0.03%, but if it exceeds 1.00%, high temperature strength characteristics,
In particular, it lowers creep rupture strength.
【００１４】Ｎb：０.０１０〜０.２５０％ Ｎbはクリープ破断強度を高めるのに有効な元素であ
り、期待される効果を得るには、少なくとも０.０１０
％添加する必要がある。しかし、０.２５０％を超える
と靭性が急激に低下するので好ましくない。Nb: 0.010 to 0.250% Nb is an element effective in increasing the creep rupture strength, and at least 0.010 is required to obtain the expected effect.
% Must be added. However, if it exceeds 0.250%, the toughness is drastically reduced, which is not preferable.
【００１５】Ｖ：０.０２〜０.５０％ ＶはＮbと同様、クリープ破断強度を高めるのに有効な
元素であり、必要なクリープ破断強度を得るためには、
少なくとも０.０２％添加する必要があるが、０.５０％
を超えると靭性が低下する。V: 0.02 to 0.50% V, like Nb, is an effective element for increasing the creep rupture strength, and in order to obtain the required creep rupture strength,
It is necessary to add at least 0.02%, but 0.50%
If it exceeds, the toughness decreases.
【００１６】Ｎ：０.０２６〜０.１０％ Ｎはオーステナイト安定化元素であり、９％Ｃr含有系
低合金鋼において、溶接金属中に適切に添加された場
合、粗大フェライトの析出を抑え、高靭性な溶接金属を
得るのに極めて有効である。本発明者は各種試験結果に
より、クリープ強度を改善するためには、最低０.０２
６％以上添加する必要があることを見い出した。しか
し、過大な添加は溶接金属中に球状欠陥を発生する原因
となるため、上限は０.１０％が望ましい。N: 0.026 to 0.10% N is an austenite stabilizing element, and in a 9% Cr-containing low alloy steel, when properly added to the weld metal, precipitation of coarse ferrite is suppressed, It is extremely effective in obtaining weld metal with high toughness. According to various test results, the present inventor has found that in order to improve creep strength, at least 0.02
It has been found that it is necessary to add more than 6%. However, excessive addition causes spherical defects in the weld metal, so the upper limit is preferably 0.10%.
【００１７】Ｏ：０.００２〜０.０３０％ Ｏ(酸素)は溶接作業性(ビード形状)の確保に有効であ
り、少なくとも０.００２％の添加が必要である。しか
し、０.０３０％を超えると溶接金属の酸素が増加し、
靭性の低下の原因となる。O: 0.002 to 0.030% O (oxygen) is effective for securing the welding workability (bead shape), and it is necessary to add at least 0.002%. However, when it exceeds 0.030%, the oxygen content of the weld metal increases,
This causes a decrease in toughness.
【００１８】Ａl：０.０２０％以下 Ａlは多量に含まれると溶融金属の流動性を阻害し、ビ
ード外観が悪化し、多層溶接の場合にはスラグ巻込みの
欠陥の原因となる。これを防ぐためには０.０２０％以
下に制限する必要がある。Al: 0.020% or less If a large amount of Al is contained, the fluidity of the molten metal is impaired, the bead appearance is deteriorated, and in the case of multi-layer welding, it causes defects in slag inclusion. In order to prevent this, it is necessary to limit it to 0.020% or less.
【００１９】Ｍn＋２Ｎi−１０Ｎ：３.００％以下 本発明における必須成分は以上の通りであるが、高温強
度特性と靭性を同時に確実に高めるために、更に重要な
点は、(Ｍn＋２Ｎi−１０Ｎ)量を３.００％以下の範囲
に調整する必要がある。すなわち、上述のようにＭn、
Ｎi、Ｎはそれぞれオーステナイト安定化元素である
が、クリープ破断強度に対しては、Ｍn、Ｎiは低下させ
る方向に働き、Ｎは向上させる方向に働く。したがっ
て、それぞれの相互作用を考慮する必要がある。それぞ
れの効果を検討した結果、働きの強さに応じて係数を決
め、上記の式で整理するとクリープ破断強度を制御でき
ることを見い出した。つまり、Ｍn＋２Ｎi−１０Ｎを
３.００％以下に保つことで良好なクリープ破断強度を
保つことができることが確認された。Mn + 2Ni-10N: 3.00% or less The essential components in the present invention are as described above. However, in order to surely enhance the high temperature strength property and toughness at the same time, the more important point is (Mn + 2Ni-10N) amount. Should be adjusted to a range of 3.00% or less. That is, as described above, Mn,
Ni and N are austenite-stabilizing elements, respectively, but with respect to creep rupture strength, Mn and Ni work to decrease and N works to improve. Therefore, it is necessary to consider each interaction. As a result of examining each effect, it was found that the creep rupture strength can be controlled by determining the coefficient according to the strength of the work and arranging it by the above formula. That is, it was confirmed that good creep rupture strength can be maintained by keeping Mn + 2Ni-10N at 3.00% or less.
【００２０】Ｔa：０.００２〜０.２５０％ 本発明者による研究の結果、ＴaはＮbやＶと同様、特に
９Ｃr−１Ｍo鋼の溶接金属の高温強度特性を改善するの
に極めて有効な元素であることが判明した。より高温で
の強度特性を重視する場合には、Ｎb、Ｖとこの元素の
複合添加が有効である。しかし、０.００２％未満では
効果がなく、また０.２５０％を超えて添加すると過剰
な強度上昇を招き、逆効果である。なお、Ｔaは必要に
応じて添加すれば良い。Ta: 0.002 to 0.250% As a result of the research conducted by the present inventors, Ta is an element which is very effective for improving the high temperature strength characteristics of the weld metal of 9Cr-1Mo steel, like Nb and V. It turned out to be When importance is attached to strength characteristics at higher temperatures, it is effective to add Nb, V and this element in combination. However, if it is less than 0.002%, there is no effect, and if it is added in excess of 0.250%, it causes an excessive increase in strength, which is the opposite effect. It should be noted that Ta may be added if necessary.
【００２１】なお、本発明の溶接ワイヤが対象とする９
Ｃr−１Ｍo鋼は、周知の成分組成を有する鋼種或いはそ
の改良型の成分組成のものも包含され、また、種々の溶
接方法及び条件で使用することができることは云うまで
もない。The welding wire of the present invention is intended to
It is needless to say that the Cr-1Mo steel includes a steel type having a known composition and a composition of an improved type thereof, and can be used in various welding methods and conditions.
【００２２】次に本発明の実施例を示す。Next, examples of the present invention will be described.
【００２３】表１に示す化学成分の鋼心線を製造し、テ
ィグ溶接、マグ溶接、サブマージアーク溶接により溶接
し、溶接後、７４０℃で８時間の溶接後熱処理を施し、
溶接金属の性能を調査した。その機械試験結果を表２に
示す。Steel wires having the chemical composition shown in Table 1 were manufactured and welded by TIG welding, mag welding and submerged arc welding, and after welding, a post-weld heat treatment was performed at 740 ° C. for 8 hours,
The performance of weld metal was investigated. The mechanical test results are shown in Table 2.
【００２４】なお、ティグ溶接には、直径２.４mmのワ
イヤを使用し、ＪＩＳ Ｚ ３３１６により溶接を行っ
た。マグ溶接には、直径１.２mmのワイヤでシールドガ
スとして９０％Ａr＋１０％ＣＯ2を使用し、ＪＩＳ Ｚ
３３１７により溶接を行った。サブマージアーク溶接に
は、直径４.０mmのワイヤと塩基性ボンドフラックスを
使用し、ＪＩＳ Ｚ ３３８３により溶接を行った。A wire having a diameter of 2.4 mm was used for TIG welding, and welding was performed according to JIS Z 3316. For MAG welding, a wire with a diameter of 1.2 mm and 90% Ar + 10% CO 2 was used as a shielding gas.
Welding was performed according to 3317. For the submerged arc welding, a wire having a diameter of 4.0 mm and a basic bond flux were used, and welding was performed in accordance with JIS Z3383.
【００２５】表２に示した結果から、本発明例はいずれ
も、優れた高温強度特性と靭性を有する溶接金属が得ら
れていることがわかる。これに対し、個々の成分量が本
発明範囲を外れている場合はもとより、個々の成分量は
本発明範囲を満足していても、(Ｍn＋２Ｎi−１０Ｎ)の
値が本発明範囲を外れている比較例は、十分な性能が得
られていない。From the results shown in Table 2, it is understood that in all the examples of the present invention, the weld metal having excellent high temperature strength characteristics and toughness was obtained. On the other hand, the value of (Mn + 2Ni-10N) is out of the range of the present invention, not only when the amount of each component is out of the range of the present invention, but even when the amount of each component satisfies the range of the present invention. The comparative example does not have sufficient performance.
【００２６】[0026]
【表１】 [Table 1]
【００２７】[0027]
【表２】 [Table 2]
【００２８】[0028]
【発明の効果】以上詳述したように、本発明の溶接ワイ
ヤによれば、９Ｃr−１Ｍo鋼用として十分な高温強度特
性(高クリープ強度)を有すると共に、優れた靭性の溶接
金属を得ることができる。As described in detail above, according to the welding wire of the present invention, it is possible to obtain a weld metal having high temperature strength characteristics (high creep strength) sufficient for 9Cr-1Mo steel and excellent toughness. You can
Claims (2)
がＦe及び不可避的不純物であることを特徴とする９Ｃr
−１Ｍo鋼溶接用ワイヤ。1. By weight% (hereinafter the same), C: 0.03 to 0.18%, Si: 0.06 to 0.80%, Mn: 0.85 to 2.00%, Cr: 8 0.00 to 11.0%, Mo: 0.80 to 1.20%, Ni: 0.03 to 1.00%, Nb: 0.010 to 0.250%, V: 0.02 to 0.50 %, N: 0.026 to 0.10%, O: 0.002 to 0.030%, Al is limited to 0.020% or less, and Mn + 2Ni-10N: 3.0% or less. , And the balance is Fe and inevitable impurities. 9Cr
-1Mo steel welding wire.
含有することを特徴とする請求項１に記載の９Ｃr−１
Ｍo鋼溶接用ワイヤ。2. 9Cr-1 according to claim 1, further comprising Ta: 0.002 to 0.250%.
Mo steel welding wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26562993A JPH0796390A (en) | 1993-09-29 | 1993-09-29 | Wire for welding 9cr-1mo steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26562993A JPH0796390A (en) | 1993-09-29 | 1993-09-29 | Wire for welding 9cr-1mo steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0796390A true JPH0796390A (en) | 1995-04-11 |
Family
ID=17419796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26562993A Pending JPH0796390A (en) | 1993-09-29 | 1993-09-29 | Wire for welding 9cr-1mo steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0796390A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6290904B1 (en) | 1998-01-20 | 2001-09-18 | Mitsubishi Heavy Industries, Ltd. | Welding materials for high-Cr steels |
| JP2016022503A (en) * | 2014-07-18 | 2016-02-08 | 株式会社神戸製鋼所 | Narrow groove tandem submerged arc welding method |
| EP3037205A1 (en) | 2014-12-25 | 2016-06-29 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Wire for gas shield arc welding |
| CN110049845A (en) * | 2016-12-12 | 2019-07-23 | 日立造船株式会社 | Welding procedure method |
| CN115125441A (en) * | 2022-06-16 | 2022-09-30 | 江苏永钢集团有限公司 | Steel for gas shielded welding wire and heat treatment softening method thereof |
| WO2024095678A1 (en) * | 2022-11-02 | 2024-05-10 | 株式会社神戸製鋼所 | Solid wire and gas-shielded arc welding method |
-
1993
- 1993-09-29 JP JP26562993A patent/JPH0796390A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6290904B1 (en) | 1998-01-20 | 2001-09-18 | Mitsubishi Heavy Industries, Ltd. | Welding materials for high-Cr steels |
| JP2016022503A (en) * | 2014-07-18 | 2016-02-08 | 株式会社神戸製鋼所 | Narrow groove tandem submerged arc welding method |
| EP3037205A1 (en) | 2014-12-25 | 2016-06-29 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Wire for gas shield arc welding |
| CN110049845A (en) * | 2016-12-12 | 2019-07-23 | 日立造船株式会社 | Welding procedure method |
| JPWO2018110357A1 (en) * | 2016-12-12 | 2019-10-24 | 日立造船株式会社 | Welding method |
| EP3552750A4 (en) * | 2016-12-12 | 2019-12-18 | Hitachi Zosen Corporation | Welding method |
| CN115125441A (en) * | 2022-06-16 | 2022-09-30 | 江苏永钢集团有限公司 | Steel for gas shielded welding wire and heat treatment softening method thereof |
| WO2024095678A1 (en) * | 2022-11-02 | 2024-05-10 | 株式会社神戸製鋼所 | Solid wire and gas-shielded arc welding method |
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