JPH08187592A - Welding material for high cr ferritic heat resistant steel - Google Patents
Welding material for high cr ferritic heat resistant steelInfo
- Publication number
- JPH08187592A JPH08187592A JP138695A JP138695A JPH08187592A JP H08187592 A JPH08187592 A JP H08187592A JP 138695 A JP138695 A JP 138695A JP 138695 A JP138695 A JP 138695A JP H08187592 A JPH08187592 A JP H08187592A
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- JP
- Japan
- Prior art keywords
- toughness
- welding
- welding material
- resistant steel
- ferrite
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は高温高能率のエネルギー
プラント等に用いられる高い靭性と高温強度を有する耐
熱鋼の溶接材料に関するものであり、さらに詳しくは、
高温におけるクリープ特性、靭性、耐割れ性に優れた溶
接金属を与える溶接材料に係わるものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding material for heat-resistant steel having high toughness and high-temperature strength, which is used in high-temperature and high-efficiency energy plants and the like.
The present invention relates to a welding material that gives a weld metal having excellent creep characteristics, toughness, and crack resistance at high temperatures.
【０００２】[0002]
【従来の技術】高温高能率型のエネルギープラント用鋼
材として、クリープ強度が極めて優れ、且つオーステナ
イト系ステンレス鋼に見られるような応力腐食割れの心
配のないフェライト系耐熱鋼が強く要望されている。こ
れに対して、９Ｃｒ−Ｍｏ系あるいは例えば特開昭６１
−０６９９４８号公報に開示されているような９Ｃｒ−
Ｍｏ−Ｗ系の耐熱鋼が開発されている。2. Description of the Related Art As a high temperature and high efficiency type steel material for energy plants, there has been a strong demand for a ferritic heat resistant steel which has extremely excellent creep strength and does not suffer from stress corrosion cracking as seen in austenitic stainless steel. On the other hand, the 9Cr-Mo system or, for example, JP-A-61
-9Cr- as disclosed in JP-A-069948
Mo-W heat resistant steel has been developed.
【０００３】この種の耐熱鋼用の溶接材料として、例え
ば特開昭６０−２５７９９１号公報に開示されている９
Ｃｒ−Ｍｏ系鋼用溶接ワイヤのように、溶接ワイヤ中の
Ｃ，Ｓｉ，Ｍｎ，Ｃｒ，Ｍｏ，Ｎｉ添加量を限定して
（Ｎｂ＋Ｖ）で０．３％以下とする溶接ワイヤが提案さ
れている。また特開平２−２８０９９３号公報では、８
〜１２Ｃｒ系溶接材料のようにＣ，Ｓｉ，Ｍｎ，Ｃｒ，
Ｎｉ，Ｍｏ，Ｗ，Ｖ，Ｎｂ，Ａｌ及びＮの添加量を限定
し、Ｃｒeq（当量）：１３以下とする溶接材料が提案さ
れている。A welding material for this type of heat-resistant steel is disclosed in, for example, Japanese Unexamined Patent Publication No. 60-257991.
A welding wire has been proposed, such as a welding wire for Cr-Mo steel, in which the amount of C, Si, Mn, Cr, Mo, and Ni added in the welding wire is limited to 0.3% or less in (Nb + V). There is. Further, in Japanese Patent Laid-Open No. 2-280993, 8
~ 12Cr-based welding materials such as C, Si, Mn, Cr,
A welding material has been proposed in which the addition amounts of Ni, Mo, W, V, Nb, Al and N are limited and Creq (equivalent): 13 or less.
【０００４】また、９Ｃｒ−Ｍｏ−Ｗ用溶接材料として
例えば特開平５−１７７３８３号公報では溶接ワイヤ中
のＣ，Ｓｉ，Ｍｎ，Ｖ，Ｎｂ，Ｎ，Ｃｒ，Ｎｉ，Ｍｏ，
Ｗ及びＣｏの添加量を限定しさらにＭｏ，Ｗ，Ｎｉ，Ｃ
ｏの添加量の間に（Ｍｏ＋Ｗ）／（Ｎｉ＋Ｃｏ）≦１．
５の関係が成立するような溶接材料が、また特開平５−
１７７３８４号公報では溶接ワイヤ中のＣ，Ｓｉ，Ｍ
ｎ，Ｖ，Ｎｂ，Ｎ，Ｃｒ，Ｎｉ，Ｍｏ，Ｗ及びＣｕの添
加量を限定しさらにＭｏ，Ｗ，Ｎｉ，Ｃｕの添加量の間
に（Ｍｏ＋Ｗ）／（Ｎｉ＋Ｃｕ）≦１．５の関係が成立
するような溶接材料が提案されている。Further, as a welding material for 9Cr-Mo-W, for example, in JP-A-5-177383, C, Si, Mn, V, Nb, N, Cr, Ni, Mo
Limit the amount of W and Co added, and further add Mo, W, Ni, C
(Mo + W) / (Ni + Co) ≦ 1 during the addition amount of o.
A welding material that satisfies the relationship of No. 5 is also disclosed in Japanese Patent Laid-Open No.
No. 177384, C, Si, M in the welding wire
n, V, Nb, N, Cr, Ni, Mo, W and Cu are limited, and the relationship of (Mo + W) / (Ni + Cu) ≦ 1.5 is established between the addition amounts of Mo, W, Ni and Cu. Welding materials that satisfy the above are proposed.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、特開昭
６０−２５７９９１号公報あるいは特開平２−２８０９
９３号公報に提案されている溶接材料は、クリープ強度
を大幅に向上させようとするものではなく、マルテンサ
イト相中にδフェライトが析出して靭性を著しく低下さ
せるという欠点を有する。δフェライトは基地中マルテ
ンサイトより著しく柔らかい相であり、このような柔ら
かい第二相が硬い基地中に分散すると全体の衝撃特性は
著しく低下する。また、高温での耐酸化性を向上させる
目的で耐熱鋼に含まれるＣｒ量は増加の傾向にあり、そ
のためさらにδフェライトが析出しやすくなり、靭性の
低下の懸念はさらに強くなっている。However, JP-A-60-257991 or JP-A-2-2809.
The welding material proposed in Japanese Patent No. 93 does not attempt to significantly improve the creep strength, but has a defect that δ ferrite is precipitated in the martensite phase and the toughness is significantly lowered. δ-ferrite is a phase that is significantly softer than martensite in the matrix, and if such a soft second phase is dispersed in a hard matrix, the overall impact properties are significantly reduced. Further, the amount of Cr contained in the heat-resistant steel tends to increase for the purpose of improving the oxidation resistance at high temperatures, so that δ-ferrite is more likely to precipitate, and the concern about a decrease in toughness becomes even stronger.
【０００６】さらに、特開平５−１７７３８３号公報あ
るいは特開平５−１７８８３４号公報に提案されている
溶接材料はクリープ強度は向上しているが、Ｍｏの添加
量が多いため高温での耐酸化性を向上させるためのＣｒ
量の増加と相まって、長時間例えば６００℃近傍の高温
で保持することによりδフェライトのσ相への変態が促
進され、時効後靭性の低下も懸念される。[0006] Further, the welding material proposed in Japanese Patent Laid-Open No. 5-177383 or Japanese Patent Laid-Open No. 5-178834 has improved creep strength, but oxidation resistance at high temperatures is high due to the large amount of Mo added. Cr to improve
In combination with the increase in the amount, holding at a high temperature, for example, near 600 ° C. for a long time promotes the transformation of δ ferrite into the σ phase, and there is a concern that the toughness after aging may be reduced.
【０００７】本発明は、このような従来の問題点を解消
しようとするものであり、高温におけるクリープ破断強
度、時効後も含めた靭性、耐割れ性に優れた溶接金属を
与える溶接材料を提供することを目的とする。The present invention is intended to solve such conventional problems, and provides a welding material which gives a weld metal excellent in creep rupture strength at high temperature, toughness even after aging, and crack resistance. The purpose is to do.
【０００８】[0008]
【課題を解決するための手段】本発明の要旨は、重量比
で、(1) Ｃ ：０．０３〜０．１２％、 Ｓｉ：０．
０１〜０．４５％、Ｍｎ：０．３〜１．５％、
Ｃｒ：８〜１３％、Ｎｉ：０．０１〜１．５％、
Ｃｏ：０．５〜５．０％、Ｍｏ：０．０１〜０．３％、
Ｗ ：０．５〜３．５％、Ｖ ：０．０３〜０．
４０％、 Ｎｂ：０．０１〜０．１５％、Ｎ ：０．
０１〜０．０８％を含有し、さらに、Ｍｏ，Ｗ，Ｎｉ，
Ｃｏ含有量の間に０．０４５≦（Ｍｏ＋Ｗ）／（Ｎｉ＋
Ｃｏ）≦２．０の関係が成立し、残部がＦｅ及び不可避
的不純物からなることを特徴とする高Ｃｒフェライト系
耐熱鋼用溶接材料であり、また(2) 前項の成分に加え
て、Ｃｕ：０．０１〜４．０％を含有し、さらに、Ｍ
ｏ，Ｗ，Ｎｉ，Ｃｏ，Ｃｕ含有量の間に０．０４５≦
（Ｍｏ＋Ｗ）／（Ｎｉ＋Ｃｏ＋Ｃｕ）≦２．０の関係が
成立することを特徴とする高Ｃｒフェライト系耐熱鋼用
溶接材料であり、また(3) 前項(1) あるいは(2) の成分
に加えて、Ｂ：０．００００５〜０．００６％を含有す
ることを特徴とする高Ｃｒフェライト系耐熱鋼用溶接材
料である。The gist of the present invention is (1) C: 0.03 to 0.12% by weight, Si: 0.
01-0.45%, Mn: 0.3-1.5%,
Cr: 8 to 13%, Ni: 0.01 to 1.5%,
Co: 0.5-5.0%, Mo: 0.01-0.3%,
W: 0.5 to 3.5%, V: 0.03 to 0.
40%, Nb: 0.01 to 0.15%, N: 0.
01-0.08%, Mo, W, Ni,
0.045 ≦ (Mo + W) / (Ni +) between Co contents
Co) ≦ 2.0, and the balance is Fe and inevitable impurities, which is a welding material for high Cr ferritic heat-resistant steel, and (2) In addition to the above-mentioned components, Cu : 0.01-4.0%, and further M
0.045 ≦ between the contents of o, W, Ni, Co and Cu
It is a welding material for high Cr ferritic heat-resisting steel, characterized in that the relationship of (Mo + W) / (Ni + Co + Cu) ≦ 2.0 is established, and in addition to the components of (3) the preceding paragraph (1) or (2). , B: 0.00005 to 0.006% is contained in the welding material for high Cr ferritic heat resistant steel.
【０００９】[0009]
【作用】本発明は溶接ワイヤ中の、ワイヤ中に適正量の
Ｃ，Ｓｉ，Ｍｎ，Ｃｒ，Ｎｉ，Ｃｏ，Ｃｕ，Ｍｏ，Ｗ，
Ｖ，Ｎｂ及びＮを添加しさらにＣｕ及びＢを選択的に添
加することにより、高温クリープ強度、靭性及び耐割れ
性を確保すると共に、Ｃｒ，Ｗ及びＭｏのフェライト生
成元素と、Ｎｉ，Ｃｏ及び選択的に添加されるＣｕのフ
ェライト生成を抑制する元素とを適正な含有量の関係で
添加することにより溶接金属中のδフェライトの生成を
抑制しクリープ強度と靭性をさらに向上させるととも
に、Ｍｏ量を低く抑えることにより、高温保持後のσ相
への変態を抑制した。以下に成分の限定理由を示す。According to the present invention, the proper amount of C, Si, Mn, Cr, Ni, Co, Cu, Mo, W in the welding wire
By adding V, Nb and N, and further by selectively adding Cu and B, high temperature creep strength, toughness and crack resistance are ensured, and ferrite forming elements of Cr, W and Mo and Ni, Co and The addition of an element that suppresses the ferrite formation of Cu, which is selectively added, in a proper content relationship suppresses the formation of δ ferrite in the weld metal to further improve the creep strength and toughness, and the Mo content. By lowering the value, the transformation to the σ phase after holding at high temperature was suppressed. The reasons for limiting the components are shown below.
【００１０】Ｃ：０．０３〜０．１２％ Ｃは焼き入れ性と強度確保のため０．０３％以上必要で
あるが、耐割れ性の観点から上限を０．１２％とした。C: 0.03 to 0.12% C is required to be 0.03% or more to secure hardenability and strength, but the upper limit was made 0.12% from the viewpoint of crack resistance.
【００１１】Ｓｉ：０．０１〜０．４５％ Ｓｉは脱酸材として０．０１％以上添加するものである
が、また耐酸化性を向上させる元素でもある。しかし
０．４５％を超えると靭性の低下を招くので、上限を
０．４５％と定めた。Si: 0.01 to 0.45% Si is added as a deoxidizing agent in an amount of 0.01% or more, and is also an element for improving the oxidation resistance. However, if it exceeds 0.45%, the toughness is lowered, so the upper limit was set to 0.45%.
【００１２】Ｍｎ：０．３〜１．５％ Ｍｎは脱酸のためのみでなく、強度保持上も必要な成分
である。上限を１．５％としたのは、これを超すと靭性
を低下させるからであり、下限は脱酸に必要な量として
０．３％と定めた。Mn: 0.3 to 1.5% Mn is a component necessary not only for deoxidizing but also for maintaining strength. The upper limit is set to 1.5% because if it exceeds this, toughness is reduced, and the lower limit is set to 0.3% as the amount required for deoxidation.
【００１３】Ｃｒ：８〜１３％ Ｃｒは耐酸化性と焼き入れ性を確保する上で非常に重要
な元素であるため最低８％必要であるが、１３％を超す
と耐割れ性を損なうと同時にδフェライトを析出させ靭
性の劣化が著しくなるので、上限は１３％とした。Cr: 8 to 13% Since Cr is a very important element for ensuring the oxidation resistance and hardenability, at least 8% is necessary, but if it exceeds 13%, the crack resistance is impaired. At the same time, δ-ferrite is precipitated and the deterioration of toughness becomes remarkable, so the upper limit was made 13%.
【００１４】Ｎｉ：０．０１〜１．５％ Ｎｉはフェライトの生成を抑制し、使用中の脆化軽減に
有効な元素であり、高温で長時間使用される本発明溶接
材料のような用途には必須の元素であるが０．０１％以
下ではその効果が得られない。他方１．５％を超すと高
温クリープ特性を劣化させるため、上限を１．５％とし
た。Ni: 0.01 to 1.5% Ni is an element that suppresses the formation of ferrite and is effective in reducing embrittlement during use, and is used for a long time at high temperature such as the welding material of the present invention. Is an indispensable element, but if it is less than 0.01%, its effect cannot be obtained. On the other hand, if it exceeds 1.5%, the high temperature creep property is deteriorated, so the upper limit was made 1.5%.
【００１５】Ｃｏ：０．５〜５．０％ ＣｏはＭｏ，Ｗ添加によるδフェライトの析出という問
題点を相殺する重要な元素であり、その効果を得るため
にＣｏは０．５％以上を必要とする。しかし、過剰添加
するとＡｃ1 点を下げるため高温焼戻しが不可能とな
り、組織の安定化処理ができなくなるという欠点を有す
るため、Ｃｏは上限を５．０％とした。Co: 0.5 to 5.0% Co is an important element that offsets the problem of precipitation of δ-ferrite due to the addition of Mo and W. In order to obtain the effect, Co should be 0.5% or more. I need. However, excessive addition lowers the Ac 1 point, making high temperature tempering impossible and stabilizing treatment of the structure impossible, so the upper limit of Co was made 5.0%.
【００１６】Ｍｏ：０．０１〜０．３％ Ｍｏは固溶体強化により高温強度を顕著に高める元素で
あるので使用温度、圧力を上昇させる目的で添加する。
しかし、多量に添加された場合溶接性を損ない、且つδ
フェライトを析出させるため靭性の低下を招く。さら
に、長時間例えば６００℃近傍の高温に保持するとσ相
の析出を助長し、時効後の靭性の低下を招く。従って上
限を０．３％とした。一方、Ｗとの共存において高温強
度の向上に効果のあるのは０．０１％以上であるので、
下限を０．０１％とした。Mo: 0.01 to 0.3% Mo is an element that remarkably enhances the high temperature strength by solid solution strengthening, so it is added for the purpose of raising the operating temperature and pressure.
However, when added in a large amount, the weldability is impaired, and δ
Since ferrite is precipitated, the toughness is lowered. Further, if it is kept at a high temperature of, for example, about 600 ° C. for a long time, precipitation of σ phase is promoted, resulting in deterioration of toughness after aging. Therefore, the upper limit is set to 0.3%. On the other hand, in the coexistence with W, 0.01% or more is effective in improving the high temperature strength.
The lower limit was made 0.01%.
【００１７】Ｗ：０．５〜３．５％ Ｗはフェライト系溶接金属のクリープ強度に寄与する固
溶体強化元素として最も優れた元素である。特に高温長
時間側でのクリープ破断強度向上の効果は極めて大き
い。しかしながら、０．５％未満ではＭｏとの共存にお
いて効果が発揮できないので、下限を０．５％と定め
た。また、過剰の添加によりδフェライトを析出させ、
溶接金属の靭性を低下させ、溶接作業性も劣化させるの
で、上限を３．５％とした。W: 0.5 to 3.5% W is the most excellent element as a solid solution strengthening element that contributes to the creep strength of the ferritic weld metal. In particular, the effect of improving the creep rupture strength at high temperature for a long time is extremely large. However, if less than 0.5%, the effect cannot be exhibited in the coexistence with Mo, so the lower limit was set to 0.5%. In addition, δ ferrite is precipitated by excessive addition,
The toughness of the weld metal is reduced and the welding workability is also deteriorated, so the upper limit was made 3.5%.
【００１８】Ｖ：０．０３〜０．４０％ Ｖは炭窒化物として析出させて強度を確保するため最低
０．０３％必要であるが、他方０．４０％を超えるとか
えって強度低下を生じるので上限を０．４０％とした。V: 0.03 to 0.40% V is required to be 0.03% at minimum in order to precipitate carbonitride to secure the strength. On the other hand, if it exceeds 0.40%, the strength is rather lowered. Therefore, the upper limit was made 0.40%.
【００１９】Ｎｂ：０．０１〜０．１５％ ＮｂはＶと同様炭窒化物として析出して強度を確保する
ほか、結晶粒を微細化して靭性を与える元素としても重
要であるため最低０．０１％必要であるが、０．１５％
を超えるとその効果が飽和してしまうだけでなく溶接性
の低下も招く。従って上限を０．１５％とした。Nb: 0.01 to 0.15% Nb is precipitated as a carbonitride similar to V to secure the strength, and is also important as an element which gives the toughness by refining the crystal grains, so that at least 0. 01% required, but 0.15%
If it exceeds, not only the effect is saturated but also the weldability is deteriorated. Therefore, the upper limit was made 0.15%.
【００２０】Ｎ：０．０１〜０．０８％ Ｎ基地中に固溶してもまた窒化物として析出しても著し
いクリープ抵抗として寄与するため最低０．０１％を必
要とする。０．０８％を超えると窒化物が多量に析出し
て、逆に靭性が低下する等の問題が生じるので、上限を
０．０８％と定めた。N: 0.01 to 0.08% Even if it forms a solid solution in N base or precipitates as a nitride, it contributes as a remarkable creep resistance, so that 0.01% is required at least. If it exceeds 0.08%, a large amount of nitride is precipitated, and conversely, there arises a problem that the toughness decreases, so the upper limit was set to 0.08%.
【００２１】また、選択的に添加されたＣｕ及びＢの限
定理由を以下に示す。 Ｃｕ：０．０１〜４．０％ ＣｕはＣｏと同じくＭｏ，Ｗ添加によるδフェライトの
析出という問題点を相殺する重要な元素である。そのた
め、Ｃｕは０．０１％以上を必要とする。しかし、Ｃｏ
と同様に過剰添加するとＡｃ1 点を下げるため高温焼戻
しが不可能となり、組織の安定化処理ができなくなると
いう欠点を有するため、上限を４．０％とした。The reasons for limiting the selectively added Cu and B are shown below. Cu: 0.01 to 4.0% Like Co, Cu is an important element that offsets the problem of precipitation of δ ferrite due to the addition of Mo and W. Therefore, Cu needs to be 0.01% or more. But Co
Similarly, if excessively added, the Ac 1 point is lowered and high temperature tempering becomes impossible, and there is a drawback that the stabilization treatment of the structure cannot be performed, so the upper limit was made 4.0%.
【００２２】Ｂ：０．００００５〜０．００６％ Ｂは粒界強化によるクリープ特性の向上に有効な元素
で、０．００００５％以上添加することによりその効果
を発揮する。しかし、０．００６％を超えて添加すると
靭性及び耐高温割れ性を損なう。そのためＢ含有量は
０．００００５〜０．００６％の範囲に限定する。B: 0.00005 to 0.006% B is an element effective for improving the creep characteristics by strengthening the grain boundaries, and its effect is exhibited by adding 0.00005% or more. However, if added in excess of 0.006%, toughness and hot crack resistance are impaired. Therefore, the B content is limited to the range of 0.00005 to 0.006%.
【００２３】さらに、Ｎｉ，Ｃｏ及びＣｕはフェライト
の析出を抑制し、一方Ｗ及びＭｏはフェライトの析出を
促す。このように、Ｎｉ，Ｃｏ及びＣｕとＷ及びＭｏは
相反する効果を与える元素であり、本合金系でのＮｉ，
Ｃｏ，Ｗ及びＭｏの適正添加範囲はＣｕを添加しない場
合、０．０４５≦（Ｍｏ＋Ｗ）／（Ｎｉ＋Ｃｏ）≦２．
０であり、Ｃｕを添加する場合、０．０４５≦（Ｍｏ＋
Ｗ）／（Ｎｉ＋Ｃｏ＋Ｃｕ）≦２．０である。Further, Ni, Co and Cu suppress the precipitation of ferrite, while W and Mo promote the precipitation of ferrite. As described above, Ni, Co and Cu, and W and Mo are elements that give conflicting effects.
The proper addition range of Co, W and Mo is 0.045 ≦ (Mo + W) / (Ni + Co) ≦ 2 when Cu is not added.
0, and when Cu is added, 0.045 ≦ (Mo +
W) / (Ni + Co + Cu) ≦ 2.0.
【００２４】溶接方法は、通常のＴＩＧ溶接方法を用
い、溶接条件は通常のＴＩＧ溶接用ソリッドワイヤを用
いて溶接する条件で良く、例えば溶接電流：１６０〜２
４０Ａ、溶接電圧：７〜１４Ｖ、溶接速度：７〜１４cm
/min、ワイヤ送給量：７〜１４ｇ/min等が考えられる。
ワイヤ径も特に限定されるものではなく通常のＴＩＧ溶
接用ソリッドワイヤのワイヤ径を用いれば良く例えば、
１．２〜３．６mmの範囲が考えられる。A normal TIG welding method may be used as the welding method, and the welding conditions may be those using a normal solid wire for TIG welding, for example, welding current: 160 to 2
40A, welding voltage: 7-14V, welding speed: 7-14cm
/ min, wire feed rate: 7 to 14 g / min, etc. are considered.
The wire diameter is not particularly limited, and the wire diameter of a normal TIG welding solid wire may be used, for example,
A range of 1.2 to 3.6 mm is conceivable.
【００２５】[0025]
【実施例】表１に示す化学組成の厚さ２０mmの、９Ｃｒ
−０．５Ｍｏ−Ｎｂ−Ｖ−Ｗ鋼及び１２Ｃｒ−０．５Ｍ
ｎ−Ｃｏ−Ｎｂ−Ｖ−Ｗ鋼に図１に示すような開先（厚
さＴ＝２０mm、開先角度θ＝４５°、ルートギャップＬ
＝６mm）を形成し、表２に示す成分組成のワイヤ径１．
６mmφの溶接ワイヤを用い、表３に示す溶接条件でＴＩ
Ｇ溶接した。Example: 9Cr having a chemical composition shown in Table 1 and a thickness of 20 mm
-0.5Mo-Nb-V-W steel and 12Cr-0.5M
A groove (thickness T = 20 mm, groove angle θ = 45 °, root gap L as shown in FIG. 1 in n-Co-Nb-VW steel.
= 6 mm), and the wire diameter of the composition shown in Table 2 is 1.
Using a welding wire of 6 mmφ, TI under the welding conditions shown in Table 3
G welded.
【００２６】得られた溶接金属を７４０℃−４時間の後
熱処理をした後、６００℃、２０kgf/mm2 及び１４kgf/
mm2 の応力での溶接金属クリープ破断試験及び試験温度
０℃での溶接金属２mmＶノッチ衝撃試験を行った。さら
に６００℃で３０００時間時効処理後の試験温度０℃で
の溶接金属２mmＶノッチ衝撃試験を行った。表４に上記
試験結果を示す。The weld metal thus obtained was post-heat-treated at 740 ° C. for 4 hours, then 600 ° C., 20 kgf / mm 2 and 14 kgf /
A weld metal creep rupture test at a stress of mm 2 and a weld metal 2 mm V notch impact test at a test temperature of 0 ° C. were performed. Further, after aging treatment at 600 ° C. for 3000 hours, a weld metal 2 mm V notch impact test was performed at a test temperature of 0 ° C. Table 4 shows the test results.
【００２７】[0027]
【表１】 [Table 1]
【００２８】[0028]
【表２】 [Table 2]
【００２９】[0029]
【表３】 [Table 3]
【００３０】[0030]
【表４】 [Table 4]
【００３１】ワイヤＷ１２−１〜８は何れも本発明の要
件を満たしており溶接金属組織はδフェライトの析出が
ないマルテンサイト単相組織であり、後熱処理後の靭
性、時効後靭性及びクリープ破断特性が良好で、且つ優
れた溶接金属を得ることができた。Each of the wires W12-1 to W12-1 satisfies the requirements of the present invention, and the weld metal structure is a martensite single-phase structure without precipitation of δ ferrite, and the toughness after post heat treatment, toughness after aging, and creep rupture. A good weld metal having good characteristics could be obtained.
【００３２】ワイヤＷＣ−１〜８は比較例を示す。ワイ
ヤＷＣ−１は通常の耐熱鋼用として使用されている２
（１／４）％Ｃｒ−１％Ｍｏ系のワイヤであるが、Ｎ量
が低く且つＮｂ，Ｖ及びＷを含まないため著しくクリー
プ破断強度が低い。Wires WC-1 to WC-8 show comparative examples. Wire WC-1 is used for ordinary heat resistant steel 2
Although it is a wire of (1/4)% Cr-1% Mo type, it has a significantly low creep rupture strength because it has a low N content and does not contain Nb, V and W.
【００３３】ワイヤＷＣ−２はＷＣ−１をさらに耐高温
腐食性を向上させた熱交換器用ワイヤであるが、Ｎが低
く且つＷは含有するが本発明の範囲の下限以下であるた
め本発明ワイヤに比べてクリープ破断強度が低い。また
Ｎｂ及びＶも含有していないため、クリープ破断強度を
低下させている。さらに、Ｎｉ，Ｃｏ及びＣｕを含有し
ていないため、δフェライトが生成し靭性も低い。The wire WC-2 is a heat exchanger wire obtained by further improving the high temperature corrosion resistance of WC-1, but it has a low N content and contains W, but since it is below the lower limit of the range of the present invention, the present invention. Creep rupture strength is lower than that of wire. Further, since Nb and V are not contained, the creep rupture strength is reduced. Further, since it does not contain Ni, Co and Cu, δ ferrite is generated and the toughness is low.
【００３４】ＷＣ−３は９Ｃｒ−Ｍｏ−Ｎｂ−Ｖ−Ｗ系
ワイヤの例であるが、Ｃ量が本発明ワイヤに比べて著し
く高いので溶接時に割れが発生し、耐割れ性及び衝撃値
が低下している。さらにＭｎ量も本発明の上限を超え
て、Ｎｉ，Ｃｏ及びＣｕを含有していないため、衝撃値
を低下させている。WC-3 is an example of 9Cr-Mo-Nb-V-W type wire, but since the amount of C is remarkably higher than that of the wire of the present invention, cracking occurs during welding, and crack resistance and impact value are high. It is falling. Further, the amount of Mn exceeds the upper limit of the present invention and does not contain Ni, Co and Cu, so the impact value is lowered.
【００３５】ＷＣ−４はＮ量が上限を超えるものであっ
て、溶接金属にブローホールが発生するとともに靭性が
乏しい。さらにＭｏが本発明の範囲の上限を超えてお
り、時効後の靭性低下が著しい。ＷＣ−５はＣｒ量が本
発明の上限を超え、且つＮｉ，Ｃｏ，Ｃｕを含有しない
ためδフェライトが生じ、靭性が低下している。さらに
Ｍｏが本発明の範囲の上限を超えており、時効後の靭性
低下が著しい。In WC-4, the N content exceeds the upper limit, blow holes are generated in the weld metal, and the toughness is poor. Further, Mo exceeds the upper limit of the range of the present invention, and the deterioration of toughness after aging is remarkable. Since WC-5 has a Cr content exceeding the upper limit of the present invention and contains no Ni, Co, or Cu, δ ferrite is generated, and the toughness is reduced. Further, Mo exceeds the upper limit of the range of the present invention, and the deterioration of toughness after aging is remarkable.
【００３６】ＷＣ−６はＭｏ，Ｗ，Ｎｉ及びＣｏを含有
するが、Ｗの含有量が本発明の範囲の上限を超えてお
り、溶接金属にδフェライトが生じており靭性が低い。
ＷＣ−７はＷＣ−６と同様にＭｏ，Ｗ，Ｎｉ，Ｃｏ及び
Ｃｕを含有するが、（Ｍｏ＋Ｗ）／（Ｎｉ＋Ｃｏ＋Ｃ
ｕ）が本発明の条件を外れており、クリープ破断強度が
低く、δフェライトが生じ靭性が低下している。また、
Ｍｏ量も本発明の範囲の上限を超えており、時効後の靭
性低下が著しい。WC-6 contains Mo, W, Ni and Co, but the content of W exceeds the upper limit of the range of the present invention, and δ ferrite is generated in the weld metal, resulting in low toughness.
Like WC-6, WC-7 contains Mo, W, Ni, Co and Cu, but (Mo + W) / (Ni + Co + C
u) is outside the conditions of the present invention, the creep rupture strength is low, δ ferrite is formed, and the toughness is lowered. Also,
The amount of Mo also exceeds the upper limit of the range of the present invention, and the deterioration of toughness after aging is remarkable.
【００３７】ＷＣ−８はＭｏ，Ｗ，Ｎｉ，Ｃｏ，Ｃｕを
含有し（Ｍｏ＋Ｗ）／（Ｎｉ＋Ｃｏ＋Ｃｕ）が２．０以
下であり本発明の条件に含まれるが、Ｍｏ量が本発明の
範囲の上限を超えており、時効後の靭性低下が著しい。
ＷＣ−９はＭｏ，Ｗ，Ｎｉ，Ｃｏ，Ｃｕを含有し、（Ｍ
ｏ＋Ｗ）／（Ｎｉ＋Ｃｏ＋Ｃｕ）が２．０以下で本発明
の条件に含まれるが、Ｂ及びＮｂが本発明の範囲の上限
を超えているため、溶接時に高温割れが発生し、溶接性
を著しく低下させている。WC-8 contains Mo, W, Ni, Co and Cu and has (Mo + W) / (Ni + Co + Cu) of 2.0 or less and is included in the conditions of the present invention, but the amount of Mo is within the range of the present invention. The upper limit is exceeded, and the toughness decreases significantly after aging.
WC-9 contains Mo, W, Ni, Co, Cu, and (M
o + W) / (Ni + Co + Cu) is 2.0 or less and is included in the conditions of the present invention, but since B and Nb exceed the upper limit of the range of the present invention, hot cracking occurs during welding, and weldability is significantly reduced. I am letting you.
【００３８】[0038]
【発明の効果】本発明の溶接材料は、従来のフェライト
系耐熱鋼用溶接ワイヤと比較して高温でのクリープ強度
を著しく高めたものであり、時効後を含めた靭性及び溶
接性等の特性にも優れている。各種発電ボイラ、化学圧
力容器等に使用される高Ｃｒフェライト系耐熱鋼を溶接
する場合に、本発明の溶接材料を使用することにより、
溶接継手の信頼性を大幅に向上させることができる。EFFECTS OF THE INVENTION The welding material of the present invention has significantly higher creep strength at high temperatures than conventional welding wires for ferritic heat-resistant steel, and has properties such as toughness and weldability including after aging. Is also excellent. By using the welding material of the present invention when welding high Cr ferritic heat-resistant steel used for various power generation boilers, chemical pressure vessels, etc.,
The reliability of the welded joint can be significantly improved.
【図１】実施例に用いた溶接部の開先形状を示す断面図
である。FIG. 1 is a sectional view showing a groove shape of a welded portion used in an example.
１ 非溶接材 ２ 裏当材 1 Non-welded material 2 Backing material
───────────────────────────────────────────────────── フロントページの続き (72)発明者 百合岡 信孝 千葉県富津市新富20−１ 新日本製鐵株式 会社技術開発本部内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobutaka Yurioka 20-1 Shintomi, Futtsu City, Chiba Nippon Steel Corporation Corporate Technology Development Division
Claims (3)
０．０４５≦（Ｍｏ＋Ｗ）／（Ｎｉ＋Ｃｏ）≦２．０の
関係が成立し、残部がＦｅ及び不可避的不純物からなる
ことを特徴とする高Ｃｒフェライト系耐熱鋼用溶接材
料。1. By weight%, C: 0.03 to 0.12%, Si: 0.01 to 0.45%, Mn: 0.3 to 1.5%, Cr: 8 to 13%, Ni : 0.01 to 1.5%, Co: 0.5 to 5.0%, Mo: 0.01 to 0.3%, W: 0.5 to 3.5%, V: 0.03 to 0 40%, Nb: 0.01 to 0.15%, N: 0.01 to 0.08%, and 0.045 ≦ (Mo + W) between Mo, W, Ni, and Co contents. A welding material for high Cr ferritic heat-resistant steel, characterized in that the relationship of /(Ni+Co)≦2.0 is established and the balance is Fe and inevitable impurities.
の間に０．０４５≦（Ｍｏ＋Ｗ）／（Ｎｉ＋Ｃｏ＋Ｃ
ｕ）≦２．０の関係が成立し、残部がＦｅ及び不可避的
不純物からなることを特徴とする高Ｃｒフェライト系耐
熱鋼用溶接材料。2. By weight%, C: 0.03 to 0.12%, Si: 0.01 to 0.45%, Mn: 0.3 to 1.5%, Cr: 8 to 13%, Ni. : 0.01 to 1.5%, Co: 0.5 to 5.0%, Mo: 0.01 to 0.3%, W: 0.5 to 3.5%, V: 0.03 to 0 40%, Nb: 0.01 to 0.15%, N: 0.01 to 0.08%, Cu: 0.01 to 4.0%, and Mo, W, Ni, Co, 0.045 ≦ (Mo + W) / (Ni + Co + C between Cu contents
u) The welding material for high Cr ferritic heat resistant steels, wherein the relationship of ≦ 2.0 is established, and the balance is Fe and inevitable impurities.
に、重量％で Ｂ ：０．００００５〜０．００６％ を含有することを特徴とする請求項１又は２記載の高Ｃ
ｒフェライト系耐熱鋼用溶接材料。3. The high C according to claim 1 or 2, characterized in that, in addition to the components contained in claim 1 or 2, it contains B: 0.00005 to 0.006% by weight.
r Welding material for ferritic heat resistant steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP138695A JPH08187592A (en) | 1995-01-09 | 1995-01-09 | Welding material for high cr ferritic heat resistant steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP138695A JPH08187592A (en) | 1995-01-09 | 1995-01-09 | Welding material for high cr ferritic heat resistant steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08187592A true JPH08187592A (en) | 1996-07-23 |
Family
ID=11500053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP138695A Withdrawn JPH08187592A (en) | 1995-01-09 | 1995-01-09 | Welding material for high cr ferritic heat resistant steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08187592A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2823226A1 (en) * | 2001-04-04 | 2002-10-11 | V & M France | STEEL AND STEEL TUBE FOR HIGH TEMPERATURE USE |
| CN103857491A (en) * | 2011-08-17 | 2014-06-11 | 株式会社日本制钢所 | First layer or overlaying layer welding section of high Cr steel turbine rotor, cladding welding material for welding section, and method for manufacturing cladding welding section |
| KR20180089310A (en) | 2017-01-31 | 2018-08-08 | 가부시키가이샤 고베 세이코쇼 | Covered electrode |
| KR20180095639A (en) | 2015-12-18 | 2018-08-27 | 신닛테츠스미킨 카부시키카이샤 | Welding materials for ferritic heat resistant steels, welded joints for ferritic heat resistant steels and ferritic welded joints for heat resistant steels |
| WO2020116588A1 (en) | 2018-12-05 | 2020-06-11 | 日本製鉄株式会社 | Method for manufacturing ferritic heat resistant steel welded joint |
| US20210086314A1 (en) * | 2019-09-20 | 2021-03-25 | Lincoln Global, Inc. | High chromium creep resistant weld metal for arc welding of thin walled steel members |
| CN113490571A (en) * | 2019-02-21 | 2021-10-08 | 株式会社神户制钢所 | Welding material for high-Cr ferrite heat-resistant steel |
-
1995
- 1995-01-09 JP JP138695A patent/JPH08187592A/en not_active Withdrawn
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002081766A1 (en) * | 2001-04-04 | 2002-10-17 | V & M France | Steel and steel tube for high-temperature use |
| CN1317415C (en) * | 2001-04-04 | 2007-05-23 | V&M法国公司 | Steel and steel pipe for high-temp. use |
| AU2002302671B2 (en) * | 2001-04-04 | 2008-01-03 | V & M France | Steel and steel tube for high-temperature use |
| AU2002302671B8 (en) * | 2001-04-04 | 2008-02-21 | V & M France | Steel and steel tube for high-temperature use |
| FR2823226A1 (en) * | 2001-04-04 | 2002-10-11 | V & M France | STEEL AND STEEL TUBE FOR HIGH TEMPERATURE USE |
| CN103857491A (en) * | 2011-08-17 | 2014-06-11 | 株式会社日本制钢所 | First layer or overlaying layer welding section of high Cr steel turbine rotor, cladding welding material for welding section, and method for manufacturing cladding welding section |
| US11090755B2 (en) | 2015-12-18 | 2021-08-17 | Nippon Steel Corporation | Welding material for ferritic heat-resistant steel, welded joint for ferritic heat-resistant steel, and method for producing welded joint for ferritic heat-resistant steel |
| KR20180095639A (en) | 2015-12-18 | 2018-08-27 | 신닛테츠스미킨 카부시키카이샤 | Welding materials for ferritic heat resistant steels, welded joints for ferritic heat resistant steels and ferritic welded joints for heat resistant steels |
| KR20180089310A (en) | 2017-01-31 | 2018-08-08 | 가부시키가이샤 고베 세이코쇼 | Covered electrode |
| WO2020116588A1 (en) | 2018-12-05 | 2020-06-11 | 日本製鉄株式会社 | Method for manufacturing ferritic heat resistant steel welded joint |
| KR20210090704A (en) | 2018-12-05 | 2021-07-20 | 닛폰세이테츠 가부시키가이샤 | Manufacturing method of ferritic heat-resistant steel welded joint |
| US11834731B2 (en) | 2018-12-05 | 2023-12-05 | Nippon Steel Corporation | Method of producing ferritic heat-resistant steel welded joint |
| CN113490571A (en) * | 2019-02-21 | 2021-10-08 | 株式会社神户制钢所 | Welding material for high-Cr ferrite heat-resistant steel |
| CN113490571B (en) * | 2019-02-21 | 2023-01-03 | 株式会社神户制钢所 | Welding material for high Cr ferrite heat-resistant steel |
| US20210086314A1 (en) * | 2019-09-20 | 2021-03-25 | Lincoln Global, Inc. | High chromium creep resistant weld metal for arc welding of thin walled steel members |
| US11772206B2 (en) * | 2019-09-20 | 2023-10-03 | Lincoln Global, Inc. | High chromium creep resistant weld metal for arc welding of thin walled steel members |
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