JP3367831B2 - Welding material for high strength ferritic heat resistant steel - Google Patents

Welding material for high strength ferritic heat resistant steel

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Publication number
JP3367831B2
JP3367831B2 JP21820796A JP21820796A JP3367831B2 JP 3367831 B2 JP3367831 B2 JP 3367831B2 JP 21820796 A JP21820796 A JP 21820796A JP 21820796 A JP21820796 A JP 21820796A JP 3367831 B2 JP3367831 B2 JP 3367831B2
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Japan
Prior art keywords
strength
welding
content
welding material
resistant steel
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JP21820796A
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Japanese (ja)
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JPH1058187A (en
Inventor
伸好 駒井
不二光 増山
知充 横山
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】本発明は高温高圧下で使用さ
れる蒸気発生器、ボイラ等の熱交換器など、特に500
℃以上の高温環境下で使用される高強度フェライト系耐
熱鋼の溶接に好適な溶接材料に関する。 【0002】 【従来の技術】ボイラ、化学工業、原子力用などの高温
耐熱耐圧部材としては、オーステナイト系ステンレス
鋼、Cr含有量が9〜12%の高Crフェライト鋼、2
・1/4Cr−1Mo鋼に代表される低Crフェライト
鋼、炭素鋼などがあるが(以下、合金成分の含有量はす
べて重量%を意味する。)、これらは対象部材の使用温
度、圧力、使用環境などに応じ、かつ経済性を考慮して
選択されている。それらの中でも、高強度の低Cr系フ
ェライト鋼が盛んに研究開発され、実用化されている。
高強度低Cr系フェライト鋼は比較的安価であるという
理由で、今後ますます使用量が増えていくも予想されて
いる。しかし、それらの高強度低Cr系フェライト鋼に
使用する溶接材料の開発は遅れており、また、コストダ
ウンの観点から、より作業性に優れた溶接材料が望まれ
ている。 【0003】 【発明が解決しようとする課題】そこで本発明は溶接後
の溶接金属が既存の高強度フェライト系耐熱鋼と同等以
上の高温強度を有し、溶接時に予熱や後熱処理省略可能
な溶接金属の靱性に優れた低Crフェライト系耐熱鋼用
溶接材料を提供するものである。 【0004】 【課題を解決するための手段】本発明は、従来添加元素
として用いれていなかったRe元素を添加した溶接材料
であって、重量%で、C:0.03〜0.08%、S
i:0.01〜0.3%、Mn:0.01〜0.3%、
P:0.002〜0.025%、S:0.001〜0.
015%、Cr:0.8〜2.5%、Ni:0.01〜
0.5%、Mo:0.01〜0.3%、V:0.01〜
0.5%、W:0.1〜2%、Nb:0.01〜0.2
%、Re:0.03〜0.5%、Al:0.003〜
0.05%、B:0.0001〜0.01%、N:0.
003〜0.03%を含み残部は鉄及び不可避的不純物
からなり、さらに、Mo/3+W/2+Re≧0.5%
及びC+Si/30+Mn/20+Ni/60+Cr/
20+Mo/15+V/10+W/7+Re/3+5x
B≦0.45%の関係を満たすことを特徴とする予後熱
省略可能な高温強度フェライト系耐熱鋼用溶接材料を提
供するものである。以下に各成分の作用とその含有量の
選定理由を説明する。 【0005】 【発明の実施の形態】CはCr,Fe,W,V,Nbと
結合して炭化物を形成し、高温強度に寄与するととも
に、それ自身がオーステナイト安定化元素として組織を
安定化する。0.03%未満では炭化物析出が不十分で
クリープ破断強度が低く、また、0.08%を越えると
場合は炭化物が過剰析出して溶接金属が著しく硬化し衝
撃特性が悪化する。また、溶接作業性もCの添加量に比
例して悪くなるため、Cの適正含有量は0.03〜0.
08%である。 【0006】Siは脱酸剤として働き、0.3%を越え
ると靱性が著しく低下し、強度に対しても有害である。
Siの含有量は0.01〜0.3%とする。 【0007】Mnは組織の安定化に有効であるが、0.
01%未満では十分な効果が得られず、0.3%を越え
ると溶接金属を硬化させる。よってMnの含有量は0.
01〜0.3%とする。 【0008】P,Sはいずれも靱性、加工性に有害な元
素で、Sが極微量であっても粒界やCr2 3 スケール
皮膜を不安定にし、強度、靱性低下の原因となるから、
上記の許容範囲内でもできるだけ少ないほうがよい。不
可避的な含有量として、Pは0.002〜0.025
%、Sは0.001〜0.015%とした。 【0009】Crは耐熱鋼の耐酸化性、高温腐食性の点
から不可欠な元素であり、その含有量が0.8%未満で
は十分な耐酸化性、高温腐食性が得られない。一方2.
5%を越えて添加すると、むしろ強度と靱性を損ない経
済性の観点からも不利となる。従って、Crの含有量は
0.8〜2.5%とする。 【0010】Niはオーステナイト安定化元素であり、
かつ靱性改善に寄与するが、その含有量が0.5%を越
えると高温クリープ強度を損なう。また経済性を鑑みて
も大量添加は不利である。従ってNiの含有量は0.0
1〜0.5%とする。 【0011】VはC,Nと結合してV(C,N)等の微
細析出物を形成する。この析出物は高温での長時間クリ
ープ強度の向上に大きく寄与するが、0.01%未満で
は十分な効果が得られず、0.5%を越える場合にはか
えってクリープ強度と靱性を損なう。よって、Vの適正
含有量は0.01〜0.5%である。 【0012】Moはクリープ強度の向上に有効である
が、0.01%以下では十分な効果が得られず、0.3
%を越えると高温で金属間化合物が析出し靱性が低下す
るだけでなく、強度に対しても効果がなくなる。従っ
て、0.01〜0.3%とした。 【0013】Wは固溶強化及び微細炭化物析出強化元素
としてクリープ強度の向上に有効であり、特にMoとの
複合添加により、さらに、クリープ強度を高めることが
できる。0.1%未満では効果がなく、2%を越えると
鋼を硬化させ溶接作業性も損なうため0.1〜2%の範
囲とする。 【0014】Reの添加は本発明ワイヤ成分の特徴であ
り、添加量に比例してクリープ強度を高めることを見い
だした。これは固溶強化によるものであるが、重要なこ
とは同様の働きをするMoやWと同時添加しても、さら
に、クリープ強度が増すことである。よって、経済性を
考え0.03〜0.5%とするのが適当である。 【0015】Mo,W及びReについてはさらに、Mo
/3+W/2+Re≧0.5%の関係を満たすように添
加する。これは、さまざまな化学成分の溶接金属の高温
強度を調査した結果、その強度はMo,W及びReの添
加量と綿密な関係があり、それらは上記式で表したよう
に、同量の添加量ではReはMo及びWのそれぞれ3倍
及び2倍の効果があることが明らかとなった。そこで、
母材と同等以上の高温強度を保つために、上記式が0.
5%以上となるようにする。 【0016】NbはVと同様,Nと結合してNb(C,
N)を形成しクリープ強度に寄与する。特に600℃以
下の比較的低温では著しい強度改善効果を示す。また、
溶接金属の組織を微細化する効果もあり、適量であれば
靱性改善にも効果がある。0.01%未満では上記の効
果が得られず、また0.2%を越える場合は未固溶Nb
Cが増えクリープ強度と靱性を損なう。したがって、N
b含有量は0.01%〜0.2%が適当である。 【0017】Alは脱酸素元素として必須であり、含有
量として0.003%以下では効果がなく、0.05%
を越える場合はクリープ強度を損なうためAl含有量は
0.003〜0.05%とする。 【0018】Bは極微量の添加により炭化物の分散、安
定化させる効果がある。0.0001%未満ではその効
果が小さく、0.01%を越えると加工性を損なうか
ら、Bの添加はその含有量を0.0001〜0.01%
の範囲するのがよい。 【0019】NはV,Nbとの炭窒化物形成に必要で
0.003%未満ではその効果がない。しかしながら
0.03%を越える場合は組織が微細化するととともに
窒化物が粗大化し、強度と靱性を損なう。よってNの含
有量は0.03%以下とし、0.003〜0.03%と
する。 【0020】C,Cr,Mo,V,W,Re及びBにつ
いてはさらに、C+Si/30+Mn/20+Ni/6
0+Cr/20+Mo/15+V/10+W/7+Re
/3+5xB≦0.45%を満たす添加する。これは上
記式を満たす範囲であれば、予後熱を省略しても溶接金
属に割れの発生がなく、溶接作業性に悪影響を与えない
ことを見いだしたからである。0.45%を越える場合
は溶接金属中に割れが発生したり、作業性が悪くなる。 【0021】 【実施例】厚さ:20mmの2.25Cr−0.1Mo
−1.6W−V−Nb鋼で図1に示すような開先(被溶
接材1の厚さt=20mm、開先角度θ=20°、裏当
材2使用でルートギャップL=20mm)を形成し、表
1に示す成分組成のワイヤ径:1.6mmの溶接ワイヤ
を用い、表2に示すような溶接条件で予熱を行わずに
(室温で溶接)TIG溶接した。その溶接の際には溶接
作業性を評価するようにした。得られた溶接金属には後
熱処理(応力除去焼鈍)を省略し、クリープ破断試験片
とシャルピー衝撃試験片を採取した。クリープ破断試験
は試験温度を650℃とし、応力は70MPa及び10
0MPaとした。シャルピー衝撃試験は0℃にて2mm
Vノッチ試験片により、衝撃試験を実施した。表3に試
験結果を示す。 【0022】 【表1】 【0023】 【表2】【0024】 【表3】 【0025】ワイヤT1〜T9はいずれも本発明の要件
を満たしており、溶接金属はベイナイト単相組織となっ
た。本発明の溶接材料で溶接した溶接金属はクリープ破
断特性については近年開発された高強度フェライト鋼の
強度をも越えており、また、衝撃特性についても、吸収
エネルギーで150J以上と、予熱後熱を省略しても高
強度と靱性を兼ね備えた溶接材料であることが確認され
た。なお、本発明溶接材料を現在の一般的な溶接条件で
施工した場合の特性についても、予熱後熱を省略した場
合と同等であった。 【0026】ワイヤT10〜T19は比較例を示す。ワ
イヤT10は通常の耐熱鋼用として使用されている2.
25Cr−1Mo系ワイヤの例である。本発明範囲外の
成分となっており、予熱なしでは、溶接金属に割れの発
生が認められ、衝撃特性も低いものであった。T11〜
T19も本発明範囲外の成分となっている。T11はM
o/3+W/2+Re=0.30%であり、クリープ破
断特性が悪く、また、溶接作業性も悪い。 【0027】T12、T14、T17、T18及びT1
9はクリープ破断特性に優れているが、いずれもC+S
i/30+Mn/20+Ni/60+Cr/20+Mo
/15+V/10+W/7+Re/3+5xB>0.4
5%となっており、割れの発生と溶接作業性が悪く、実
用に耐えられない。 【0028】T13、T15及びT16は溶接作業性は
比較的良好であるものの、T13及びT16はクリープ
破断強度は低く、またT15では、衝撃特性が最も悪
い。 【0029】以上から、比較例ではクリープ破断特性、
衝撃特性及び溶接作業性を全て満たすようなものではな
く、予熱後熱なしには使用できない溶接材料であること
がわかる。 【0030】 【発明の効果】本発明溶接材料は従来の2.25Cr−
1Mo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、靱性及び作業性などの特
性にも優れている。各種発電用ボイラ、化学圧力容器な
どに使用される低Crフェライト系耐熱鋼を溶接する際
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できるとともに、予熱後熱を省略で
き、工作性が改善される。
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat generator such as a steam generator or a boiler used under high temperature and high pressure, and
The present invention relates to a welding material suitable for welding high-strength ferritic heat-resistant steel used in a high-temperature environment of not less than ° C. 2. Description of the Related Art Austenitic stainless steel, high Cr ferritic steel having a Cr content of 9 to 12%, and 2
-There are low Cr ferritic steel represented by 1 / 4Cr-1Mo steel, carbon steel, and the like (hereinafter, all content of alloy components means wt%), but these are used temperature, pressure, The selection is made according to the usage environment and the like and economics. Among them, high-strength low Cr ferritic steels have been actively researched and developed and put to practical use.
The use of high-strength low-Cr ferritic steel is expected to increase in the future because it is relatively inexpensive. However, the development of welding materials used for these high-strength low-Cr ferritic steels has been delayed, and from the viewpoint of cost reduction, welding materials with better workability are desired. [0003] Accordingly, the present invention provides a welding method in which the weld metal after welding has a high-temperature strength equal to or higher than that of existing high-strength ferritic heat-resistant steel, and the preheating or post-heating treatment can be omitted during welding. An object of the present invention is to provide a welding material for low Cr ferritic heat resistant steel having excellent metal toughness. SUMMARY OF THE INVENTION The present invention relates to a welding material to which a Re element, which has not been used as an additional element in the prior art, is added. S
i: 0.01 to 0.3%, Mn: 0.01 to 0.3%,
P: 0.002 to 0.025%, S: 0.001 to 0.
015%, Cr: 0.8 to 2.5%, Ni: 0.01 to
0.5%, Mo: 0.01 to 0.3%, V: 0.01 to
0.5%, W: 0.1 to 2%, Nb: 0.01 to 0.2
%, Re: 0.03 to 0.5%, Al: 0.003 to
0.05%, B: 0.0001 to 0.01%, N: 0.
003 to 0.03%, the balance being iron and inevitable impurities, and Mo / 3 + W / 2 + Re ≧ 0.5%
And C + Si / 30 + Mn / 20 + Ni / 60 + Cr /
20 + Mo / 15 + V / 10 + W / 7 + Re / 3 + 5x
An object of the present invention is to provide a welding material for a high-temperature strength ferritic heat-resistant steel, which satisfies the relationship of B ≦ 0.45%, which can omit a prognostic heat. The function of each component and the reason for selecting the content will be described below. DESCRIPTION OF THE PREFERRED EMBODIMENTS C combines with Cr, Fe, W, V, and Nb to form carbides and contributes to high-temperature strength, and itself stabilizes the structure as an austenite stabilizing element. . If it is less than 0.03%, the precipitation of carbides is insufficient and the creep rupture strength is low. If it exceeds 0.08%, the carbides are excessively precipitated and the weld metal is remarkably hardened to deteriorate the impact characteristics. In addition, since the welding workability also deteriorates in proportion to the amount of C added, the appropriate content of C is 0.03 to 0.3.
08%. [0006] Si acts as a deoxidizing agent, and if it exceeds 0.3%, toughness is remarkably reduced, and is harmful to strength.
The content of Si is set to 0.01 to 0.3%. [0007] Mn is effective for stabilizing the structure.
If it is less than 01%, a sufficient effect cannot be obtained, and if it exceeds 0.3%, the weld metal is hardened. Therefore, the content of Mn is 0.1.
01 to 0.3%. Both P and S are harmful elements for toughness and workability. Even if the amount of S is extremely small, P and S destabilize the grain boundaries and Cr 2 O 3 scale film, and cause reduction in strength and toughness. ,
Even within the above-mentioned allowable range, it is better to be as small as possible. As an inevitable content, P is 0.002 to 0.025.
% And S are set to 0.001 to 0.015%. [0009] Cr is an indispensable element from the viewpoint of the oxidation resistance and high-temperature corrosion resistance of heat-resistant steel. If its content is less than 0.8%, sufficient oxidation resistance and high-temperature corrosion resistance cannot be obtained. On the other hand, 2.
If it exceeds 5%, strength and toughness are rather impaired, which is disadvantageous from the viewpoint of economy. Therefore, the content of Cr is set to 0.8 to 2.5%. Ni is an austenite stabilizing element,
And it contributes to improvement in toughness, but if its content exceeds 0.5%, the high temperature creep strength is impaired. Also, in view of economy, large-scale addition is disadvantageous. Therefore, the content of Ni is 0.0
1% to 0.5%. V combines with C and N to form fine precipitates such as V (C, N). These precipitates greatly contribute to the improvement of the long-term creep strength at high temperatures. However, if the content is less than 0.01%, a sufficient effect cannot be obtained. If the content exceeds 0.5%, the creep strength and toughness are rather deteriorated. Therefore, the appropriate content of V is 0.01 to 0.5%. Mo is effective in improving the creep strength, but if it is less than 0.01%, a sufficient effect cannot be obtained.
%, The intermetallic compound is precipitated at a high temperature to lower the toughness, and also has no effect on the strength. Therefore, it was set to 0.01 to 0.3%. W is effective as a solid solution strengthening element and a fine carbide precipitation strengthening element in improving the creep strength. In particular, the addition of Mo in combination with Mo can further increase the creep strength. If it is less than 0.1%, there is no effect, and if it exceeds 2%, the steel is hardened and the workability of welding is impaired, so the content is made 0.1 to 2%. The addition of Re is a feature of the wire component of the present invention, and has been found to increase the creep strength in proportion to the amount added. This is due to solid solution strengthening, but what is important is that the creep strength further increases even when Mo and W having the same function are added simultaneously. Therefore, it is appropriate to set the content to 0.03 to 0.5% in consideration of economy. As for Mo, W and Re, Mo
/3+W/2+Re≧0.5%. This is because, as a result of investigating the high-temperature strength of weld metals of various chemical components, the strength has a close relationship with the amounts of Mo, W, and Re added, and as shown in the above formula, the same amount of added metal is used. In terms of the amount, Re was found to be three and two times as effective as Mo and W, respectively. Therefore,
In order to maintain high-temperature strength equal to or higher than that of the base material, the above formula is set to 0.1.
It should be 5% or more. Nb, like V, combines with N to form Nb (C,
N) to contribute to creep strength. Particularly at a relatively low temperature of 600 ° C. or lower, a remarkable strength improving effect is exhibited. Also,
There is also an effect of making the structure of the weld metal finer, and an appropriate amount is also effective in improving toughness. If it is less than 0.01%, the above effects cannot be obtained. If it exceeds 0.2%, undissolved Nb
C is increased and creep strength and toughness are impaired. Therefore, N
The b content is suitably from 0.01% to 0.2%. Al is indispensable as a deoxidizing element. When the content is 0.003% or less, there is no effect.
If it exceeds, the Al content is set to 0.003 to 0.05% because the creep strength is impaired. B has the effect of dispersing and stabilizing carbides by adding a very small amount. If it is less than 0.0001%, the effect is small, and if it exceeds 0.01%, processability is impaired. Therefore, the addition of B reduces the content to 0.0001 to 0.01%.
It is better to range. N is necessary for the formation of carbonitrides with V and Nb, and its effect is less than 0.003%. However, if the content exceeds 0.03%, the structure becomes finer and the nitride coarsens, impairing strength and toughness. Therefore, the content of N is set to 0.03% or less, and is set to 0.003 to 0.03%. For C, Cr, Mo, V, W, Re and B, C + Si / 30 + Mn / 20 + Ni / 6
0 + Cr / 20 + Mo / 15 + V / 10 + W / 7 + Re
/3+5×B≦0.45%. This is because, as long as the above formula is satisfied, even if the prognostic heat is omitted, no crack is generated in the weld metal, and it has been found that the welding workability is not adversely affected. If it exceeds 0.45%, cracks occur in the weld metal and workability deteriorates. Example: 20 mm 2.25Cr-0.1Mo with a thickness of 20 mm
-1.6W-V-Nb steel groove as shown in Fig. 1 (thickness t of welded material 1 = 20mm, groove angle θ = 20 °, root gap L = 20mm with backing material 2) And TIG welding was performed using a welding wire having a component composition shown in Table 1 and a wire diameter of 1.6 mm without performing preheating (welding at room temperature) under welding conditions shown in Table 2. At the time of the welding, the welding workability was evaluated. Post heat treatment (stress relief annealing) was omitted from the obtained weld metal, and a creep rupture test piece and a Charpy impact test piece were collected. The creep rupture test was conducted at a test temperature of 650 ° C. and a stress of 70 MPa and 10 MPa.
It was set to 0 MPa. Charpy impact test is 2mm at 0 ° C
An impact test was performed using a V-notch specimen. Table 3 shows the test results. [Table 1] [Table 2] [Table 3] The wires T1 to T9 all satisfied the requirements of the present invention, and the weld metal had a bainite single phase structure. The weld metal welded with the welding material of the present invention has a creep rupture property exceeding the strength of a recently developed high-strength ferritic steel, and also has an impact property of absorbing energy of 150 J or more and heat after preheating. It was confirmed that the welding material had both high strength and toughness even if omitted. In addition, the characteristics when the welding material of the present invention was applied under current general welding conditions were also equivalent to the case where the heat after preheating was omitted. The wires T10 to T19 show a comparative example. 1. Wire T10 is used for ordinary heat-resistant steel.
It is an example of a 25Cr-1Mo-based wire. It was a component outside the scope of the present invention, and without preheating, cracks were observed in the weld metal and the impact characteristics were low. T11-
T19 is also a component outside the scope of the present invention. T11 is M
o / 3 + W / 2 + Re = 0.30%, resulting in poor creep rupture characteristics and poor welding workability. T12, T14, T17, T18 and T1
No. 9 is excellent in creep rupture characteristics, but all are C + S
i / 30 + Mn / 20 + Ni / 60 + Cr / 20 + Mo
/15+V/10+W/7+Re/3+5xB>0.4
The content is 5%, and the generation of cracks and welding workability are poor, and cannot be put to practical use. T13, T15 and T16 have relatively good welding workability, but T13 and T16 have low creep rupture strength, and T15 has the worst impact characteristics. From the above, in the comparative example, the creep rupture characteristics,
It is understood that the welding material does not satisfy all of the impact characteristics and welding workability and cannot be used without heat after preheating. The welding material of the present invention is a conventional 2.25 Cr-
Compared with the welding wire for 1Mo steel, it has significantly increased creep strength at high temperatures, and has excellent properties such as toughness and workability. By using the welding material of the present invention when welding low 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, and the heat after preheating can be improved. Can be omitted, and workability is improved.

【図面の簡単な説明】 【図1】本発明の溶接材料を用いて溶接する際の開先形
状を示す図。
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a groove shape when welding is performed using the welding material of the present invention.

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平10−6079(JP,A) 特開 平10−1749(JP,A) 特開 平9−59746(JP,A) 特開 平9−118953(JP,A) 特開 平6−306550(JP,A) 特開 平7−303988(JP,A) 特開 平5−269590(JP,A) (58)調査した分野(Int.Cl.7,DB名) B23K 35/30 C22C 38/00 - 38/60 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-6079 (JP, A) JP-A-10-1749 (JP, A) JP-A-9-59746 (JP, A) JP-A 9-59 118953 (JP, A) JP-A-6-306550 (JP, A) JP-A-7-303988 (JP, A) JP-A-5-269590 (JP, A) (58) Fields investigated (Int. 7 , DB name) B23K 35/30 C22C 38/00-38/60

Claims (1)

(57)【特許請求の範囲】 【請求項1】 重量%で、C:0.03〜0.08%、
Si:0.01〜0.3%、Mn:0.01〜0.3
%、P:0.002〜0.025%、S:0.001〜
0.015%、Cr:0.8〜2.5%、Ni:0.0
1〜0.5%、Mo:0.01〜0.3%、V:0.0
1〜0.5%、W:0.1〜2%、Nb:0.01〜
0.2%、Re:0.03〜0.5%、Al:0.00
3〜0.05%、B:0.0001〜0.01%、N:
0.003〜0.03%を含み残部は鉄及び不可避的不
純物からなり、さらに、Mo/3+W/2+Re≧0.
5%及びC+Si/30+Mn/20+Ni/60+C
r/20+Mo/15+V/10+W/7+Re/3+
5xB≦0.45%の関係を満たすことを特徴とする予
後熱省略可能な高温強度フェライト系耐熱鋼用溶接材
料。
(57) [Claims 1] C: 0.03 to 0.08% by weight,
Si: 0.01 to 0.3%, Mn: 0.01 to 0.3
%, P: 0.002 to 0.025%, S: 0.001 to
0.015%, Cr: 0.8 to 2.5%, Ni: 0.0
1 to 0.5%, Mo: 0.01 to 0.3%, V: 0.0
1 to 0.5%, W: 0.1 to 2%, Nb: 0.01 to
0.2%, Re: 0.03-0.5%, Al: 0.00
3 to 0.05%, B: 0.0001 to 0.01%, N:
0.003 to 0.03%, the balance being iron and unavoidable impurities, and Mo / 3 + W / 2 + Re ≧ 0.
5% and C + Si / 30 + Mn / 20 + Ni / 60 + C
r / 20 + Mo / 15 + V / 10 + W / 7 + Re / 3 +
A welding material for a high-temperature-strength ferritic heat-resistant steel capable of omitting a prognosis heat, wherein the welding material satisfies a relationship of 5 × B ≦ 0.45%.
JP21820796A 1996-08-20 1996-08-20 Welding material for high strength ferritic heat resistant steel Expired - Fee Related JP3367831B2 (en)

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Application Number Priority Date Filing Date Title
JP21820796A JP3367831B2 (en) 1996-08-20 1996-08-20 Welding material for high strength ferritic heat resistant steel

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JP3367831B2 true JP3367831B2 (en) 2003-01-20

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