JPH07268563A - Welding material for high cr ferritic heat resistant steel - Google Patents
Welding material for high cr ferritic heat resistant steelInfo
- Publication number
- JPH07268563A JPH07268563A JP8272194A JP8272194A JPH07268563A JP H07268563 A JPH07268563 A JP H07268563A JP 8272194 A JP8272194 A JP 8272194A JP 8272194 A JP8272194 A JP 8272194A JP H07268563 A JPH07268563 A JP H07268563A
- Authority
- JP
- Japan
- Prior art keywords
- toughness
- welding material
- strength
- resistant steel
- ferrite
- 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.)
- Pending
Links
Landscapes
- Nonmetallic Welding Materials (AREA)
- Arc Welding In General (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は高い靭性を有する高強度
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用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 high-strength heat-resistant steel having high toughness, and more specifically to a welding material which gives a weld metal having excellent creep characteristics, toughness, and crack resistance at high temperatures. It is related.
【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かつオーステナイ
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
がないフェライト系耐熱鋼が強く要望され始めている。
この種の用途を目的として、例えば特開昭60−257
991号公報に開示されている9Cr−Mo系鋼用溶接
ワイヤのように、溶接ワイヤ中のC、Si、Mn、C
r、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、N添加量を限定し、Creq:13%以下と
する溶接材料が提案されている。2. Description of the Related Art As a high-temperature, high-efficiency type steel material for energy plants, there has been a strong demand for ferritic heat-resisting steels which have extremely excellent creep strength and are free from the risk of stress corrosion cracking as seen in austenitic stainless steels.
For the purpose of this kind of use, for example, JP-A-60-257.
C, Si, Mn, and C in the welding wire, such as the welding wire for 9Cr-Mo steel disclosed in Japanese Patent No. 991.
0.3 with (Nb + V) by limiting the added amount of r, Mo, Ni
% Welding wires have been proposed. Further, in Japanese Unexamined Patent Publication No. 2-280993, C, Si, Mn, Cr, Ni, Mo, W, V.
A welding material has been proposed in which the amounts of Nb, Al, and N added are limited and Cr eq : 13% or less.
【0003】[0003]
【発明が解決しようとする課題】しかしながら、これら
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フェライトが晶出して靭性
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、
この様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。本発明は、高温における
クリープ破断強度、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。However, these are not intended to significantly improve the creep strength, but they have a drawback that δ ferrite crystallizes in the martensite phase and remarkably lowers the toughness. δ ferrite is a significantly softer phase than martensite in the matrix,
When such a soft second phase is dispersed in a hard matrix, the overall impact properties are significantly reduced. An object of the present invention is to provide a welding material that gives a weld metal excellent in creep rupture strength, toughness, and crack resistance at high temperatures.
【0004】[0004]
【課題を解決するための手段】本発明は上記課題を解決
するものであって、重量比で、Ni:0.05%未満
で、かつ、C:0.03〜0.12%、Si:0.01
〜0.3%、Mn:0.3〜1.5%、V:0.03〜
0.40%、Nb:0.01〜0.15%、N:0.0
1〜0.08%、Cr:8〜13%、Mo:0.3〜
1.6%、W:0.5〜3.5%を必須成分として含有
し、かつ、Co:1.0〜5.0%、Cu:0.5〜
4.0%の少なくとも一方を含有し、さらにMo、W、
Co、Cu含有量の間に(Mo+W)/(Co+Cu)
≦1.5なる関係が成立し、残部がFeおよび不可避的
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る。Means for Solving the Problems The present invention is to solve the above-mentioned problems, and in a weight ratio, Ni: less than 0.05%, C: 0.03 to 0.12%, Si: 0.01
~ 0.3%, Mn: 0.3-1.5%, V: 0.03-
0.40%, Nb: 0.01 to 0.15%, N: 0.0
1 to 0.08%, Cr: 8 to 13%, Mo: 0.3 to
1.6%, W: 0.5 to 3.5% as an essential component, and Co: 1.0 to 5.0%, Cu: 0.5 to
At least one of 4.0%, Mo, W,
Between the Co and Cu contents (Mo + W) / (Co + Cu)
A welding material for high Cr ferritic heat-resistant steel, characterized in that the relationship of ≦ 1.5 is established and the balance consists of Fe and inevitable impurities.
【0005】[0005]
【作用】本発明は溶接ワイヤ中のNi量の上限を限定
し、かつワイヤ中に適正量のC、Si、Mn、V、N
b、N、Cr、MoおよびWを添加することにより、高
温クリープ強度、靭性および耐割れ性を確保すると共
に、さらにCo、Cuの少なくとも一方を添加し、Mo
およびWとの適正な含有量の関係を保つことにより溶接
金属におけるδフェライトの生成を抑制し、さらにクリ
ープ強度と靭性を格段に高めることを特徴とする。以下
に成分の限定理由を示す。The present invention limits the upper limit of the amount of Ni in the welding wire, and the proper amount of C, Si, Mn, V, N in the wire.
By adding b, N, Cr, Mo and W, high temperature creep strength, toughness and crack resistance are ensured, and at least one of Co and Cu is further added.
By maintaining an appropriate content relationship with and W, generation of δ ferrite in the weld metal is suppressed, and further, creep strength and toughness are markedly enhanced. The reasons for limiting the components are shown below.
【0006】Ni:0.05%未満 Niは靭性を向上させる元素であるが、一方では高温ク
リープ強度を低下させる元素でもある。本発明では、高
温クリープ強度を向上させることを主目的とし、さらに
Si、Mn、Nb、N、Cr、Mo、W、CoおよびC
uの添加量を適正な量に保つことにより靭性低下を防ぐ
ことができるために、Ni含有量を0.05%未満とし
た。Ni: Less than 0.05% Ni is an element that improves toughness, but is also an element that reduces high temperature creep strength. In the present invention, the main purpose is to improve high temperature creep strength, and further Si, Mn, Nb, N, Cr, Mo, W, Co and C are used.
Since it is possible to prevent the toughness from decreasing by keeping the added amount of u at an appropriate amount, the Ni content was set to less than 0.05%.
【0007】C:0.03〜0.12%、Cは焼入れ性
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 needs 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.
【0008】Si:0.01〜0.3% Siは脱酸剤として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
0.3%を超えると靭性の低下を招くので、上限を0.
3%と定めた。Si: 0.01 to 0.3% 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 0.3%, the toughness is lowered, so the upper limit is set to 0.
It was set at 3%.
【0009】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: 0.3-1.5% Mn is a component required not only for deoxidation but also for strength retention. The upper limit is set to 1.5% because if it exceeds this, the toughness is reduced, and the lower limit is set to 0.
It was set at 3%.
【0010】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%が必要であるが、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 least in order to deposit carbonitrides to secure the strength. On the other hand, when it exceeds 0.40%, the strength is rather lowered. Therefore, the upper limit is set to 0.40%.
【0011】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%が必要であるが、0.15
%を超えるとその効果は飽和してしまうだけでなく溶接
性の低下も招く。したがって上限を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 for refining the crystal grains to give toughness, so at least 0. 01% is 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%.
【0012】N:0.01〜0.08% Nは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などの問題が生じるので上
限を0.08%と定めた。N: 0.01 to 0.08% N, even if it forms a solid solution in the matrix or precipitates as a nitride, contributes as a remarkable creep resistance, so at least 0.01%.
Need. If it exceeds 0.08%, a large amount of nitride precipitates, and conversely, there arises a problem that the toughness decreases, so the upper limit was set to 0.08%.
【0013】Cr:8〜13% Crは耐酸化性と焼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フェライトを晶出させ靭性
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 and at the same time. The upper limit was set to 13% because δ-ferrite is crystallized and toughness deteriorates significantly.
【0014】Mo:0.3〜1.6% 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
が、多量に添加された場合溶接性を損ない、かつδフェ
ライトを晶出させるため靭性の低下を招く。したがって
上限を1.6%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0.3%以上であるので下
限を0.3%とした。Mo: 0.3 to 1.6% Since Mo is an element that remarkably enhances high temperature strength by solid solution strengthening, it is added for the purpose of raising the operating temperature and pressure, but when a large amount is added, weldability is improved. In addition, the δ-ferrite is crystallized, resulting in a decrease in toughness. Therefore, the upper limit is set to 1.6%. On the other hand, the coexistence with W has the effect of improving the high temperature strength of 0.3% or more, so the lower limit was made 0.3%.
【0015】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フェライトを晶出させ溶接金属
の靭性が低下し、溶接作業性も劣化するので上限を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 it is less than 0.5%, the effect cannot be exhibited in the coexistence with Mo, so the lower limit was set to 0.5%. Further, the excessive addition causes the δ ferrite to crystallize, the toughness of the weld metal is lowered, and the welding workability is also deteriorated, so the upper limit is 3.
It was set to 5%.
【0016】Co:1.0〜5.0%、Cu:0.5〜
4.0%の少なくとも一方 Co、CuはMo、W添加によるδフェライトの晶出と
いう問題点を相殺する重要な元素であり、Coは1.0
%以上、Cu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、Cuは上限を4.
0%とした。このようにCo、CuはMo、Wとは相反
する効果を与える元素であり、本合金系での適切な添加
範囲は(Mo+W)/(Co+Cu)≦1.5である。
1.5を超えるとCoおよびCuによるδフェライトの
抑制効果が得られずクリープ強度および靭性低下を招
く。Co: 1.0 to 5.0%, Cu: 0.5 to
At least one of 4.0% Co and Cu are important elements that offset the problem of crystallization of δ ferrite due to the addition of Mo and W, and Co is 1.0
%, Cu needs to be 0.5% or more. However, excessive addition lowers the A C1 point, making high temperature tempering impossible and stabilizing treatment of the structure impossible. Therefore, the upper limit of Co is 5.0% and the upper limit of Cu is 4.
It was set to 0%. As described above, Co and Cu are elements that have the effect of conflicting with Mo and W, and the appropriate addition range in the present alloy system is (Mo + W) / (Co + Cu) ≦ 1.5.
When it exceeds 1.5, the effect of suppressing δ ferrite by Co and Cu cannot be obtained, and the creep strength and toughness are deteriorated.
【0017】[0017]
【実施例】厚さ20mmのASTM規格A387 Gr
22、9Cr−1Mo鋼、9Cr−1Mo−Nb−V−
W鋼、9Cr−0.5Mo−Nb−V−W鋼、12Cr
−0.5Mo−Nb−V−W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=12mm)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に示す母材との組み合わせと、表3
に示す溶接条件でTIG溶接した。[Example] ASTM standard A387 Gr having a thickness of 20 mm
22, 9Cr-1Mo steel, 9Cr-1Mo-Nb-V-
W steel, 9Cr-0.5Mo-Nb-V-W steel, 12Cr
-0.5Mo-Nb-V-W steel groove as shown in FIG. 1 (thickness T of welded material 1 = 20 mm, groove angle θ = 20)
°, using a backing material 2 to form a root gap L = 12 mm), using a welding wire having a composition of the composition shown in Table 1 and a wire diameter of 1.6 mm, the combination with the base material shown in Table 2 and Table 3
TIG welding was performed under the welding conditions shown in.
【0018】[0018]
【表1】 [Table 1]
【0019】[0019]
【表2】 [Table 2]
【0020】[0020]
【表3】 [Table 3]
【0021】得られた溶接金属に740℃−4時間の後
熱処理をした後、600℃、20kgf/mm2 の応力
でのクリープ破断試験および試験温度0℃での2mmV
ノッチ衝撃試験を行った。表2に上記試験結果を示す。
ワイヤTGCC−1〜9はいずれも本発明の要件を満た
しており、溶接金属組織はδフェライトの晶出がないマ
ルテンサイト単相組織であり、後熱処理後の靭性および
クリープ破断特性が良好で、かつ優れた溶接金属を得る
ことができた。After the post-heat treatment at 740 ° C. for 4 hours, the obtained weld metal was subjected to a creep rupture test at a stress of 20 kgf / mm 2 at 600 ° C. and 2 mmV at a test temperature of 0 ° C.
A notch impact test was conducted. Table 2 shows the test results.
Wires TGCC-1 to 9 all satisfy the requirements of the present invention, the weld metal structure is a martensite single phase structure without crystallization of δ ferrite, and the toughness and creep rupture properties after post heat treatment are good, Moreover, an excellent weld metal could be obtained.
【0022】ワイヤTGCC−10〜19は比較例を示
す。ワイヤTGCC−10は通常の耐熱鋼用として使用
されている2 1/4%Cr−1%Mo系ワイヤの例であ
り、ワイヤTGCC−11は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が低くかつWも含
有しないためいずれも本発明ワイヤに比べて著しくクリ
ープ破断強度が低い。TGCC−12は9Cr−1Mo
−Nb−V−W系の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、耐割れ性および衝撃値が低下している。Wires TGCC-10 to 19 represent comparative examples. The wire TGCC-10 is an example of a 2 1/4% Cr-1% Mo-based wire that is used for ordinary heat resistant steel, and the wire TGCC-11 is a heat exchanger wire with further improved high temperature corrosion resistance. However, since N is low and W is not contained, the creep rupture strength is significantly lower than that of the wire of the present invention. TGCC-12 is 9Cr-1Mo
This is an example of a -Nb-V-W type wire, but since the amount of C is significantly higher than that of the wire of the present invention, cracking occurs during welding, and crack resistance and impact value are lowered.
【0023】TGCC−13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
靭性が乏しかった。TGCC−14はC、Nが低くC
o、Cuもないためδフェライトが生じ靭性が低下して
いる。In TGCC-13, the N content exceeds the upper limit, and blow holes were generated in the weld metal and the toughness was poor. TGCC-14 has low C and N, and C
Since there is no o or Cu, δ ferrite is generated and the toughness is lowered.
【0024】TGCC−15は9Cr−0.5Mo−N
b−V−W系でMo、W、Ni、Coを含有するが、
(Mo+W)/(Cu+Co)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フェライトが生じてお
り靭性が低い。TGCC−16は12Cr−0.5Mo
−Nb−V−W系でTGCC−15と同様にMo、W、
Coを含有するが、(Mo+W)/(Cu+Co)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。TGCC-15 is 9Cr-0.5Mo-N
Although it contains Mo, W, Ni, and Co in the bVW system,
(Mo + W) / (Cu + Co) is outside the conditions of the present invention, the creep rupture strength is low, and δ ferrite is generated, and the toughness is low. TGCC-16 is 12Cr-0.5Mo
-Nb-V-W system, Mo, W, like TGCC-15
Although it contains Co, (Mo + W) / (Cu + Co) is out of the condition of the present invention, the creep rupture strength is low, and δ ferrite is generated, and the toughness is lowered.
【0025】TGCC−17は9Cr−0.5Mo−N
b−V−W系でMo、W、Ni、Cuを含有するが、
(Mo+W)/(Cu+Co)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フェライトが生じてお
り靭性が低い。TGCC−18は12Cr−0.5Mo
−Nb−V−W系でTGCC−17と同様にMo、W、
Cuを含有するが、(Mo+W)/(Cu+Co)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。TGCC-17 is 9Cr-0.5Mo-N
Although it contains Mo, W, Ni, and Cu in the bVW system,
(Mo + W) / (Cu + Co) is outside the conditions of the present invention, the creep rupture strength is low, and δ ferrite is generated, and the toughness is low. TGCC-18 is 12Cr-0.5Mo
-Nb-V-W system, Mo, W, like TGCC-17
Although it contains Cu, (Mo + W) / (Cu + Co) is out of the conditions of the present invention, the creep rupture strength is low, and δ ferrite is generated, and the toughness is lowered.
【0026】TGCC−19は9Cr−1Mo−Nb−
V−W系で同様にMo、W、Co、Cuを含有するが、
(Mo+W)/(Cu+Co)が本発明の条件を外れて
いる。そのため、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。TGCC-19 is 9Cr-1Mo-Nb-
The V-W system also contains Mo, W, Co, and Cu, but
(Mo + W) / (Cu + Co) is outside the conditions of the present invention. Therefore, the creep rupture strength is low and δ ferrite is generated, and the toughness is lowered.
【0027】[0027]
【発明の効果】本発明溶接材料は従来の9%〜12%C
r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、靭性および溶接性などの特性
にも優れている。各種発電ボイラ、化学圧力容器などに
使用される9〜12%Cr系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
大幅に向上することができる。The welding material according to the present invention has a conventional content of 9% to 12% C.
Compared with welding wire for r steel, the creep strength at high temperature is remarkably increased, and it is also excellent in characteristics such as toughness and weldability. By using the welding material of the present invention when welding 9 to 12% Cr steel used for various power generation boilers, chemical pressure vessels, etc., the reliability of the welded joint can be greatly improved.
【図1】実施例に用いた溶接部の開先形状を示す断面図FIG. 1 is a sectional view showing a groove shape of a welded portion used in an example.
【符号の説明】 1 被溶接材 2 裏当材[Explanation of symbols] 1 material to be welded 2 backing material
Claims (1)
なくとも一方を含有し、さらにMo、W、Co、Cu含
有量の間に (Mo+W)/(Co+Cu)≦1.5 なる関係が成立し、残部がFeおよ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 ratio, Ni: less than 0.05%, and C: 0.03 to 0.12% Si: 0.01 to 0.3% Mn: 0.3 to 1.5% V: 0.03 to 0.40% Nb: 0.01 to 0.15% N: 0.01 to 0.08% Cr: 8 to 13% Mo: 0.3 to 1.6% W: 0.0. 5 to 3.5% as an essential component, and at least one of Co: 1.0 to 5.0% and Cu: 0.5 to 4.0%, and Mo, W, Co, A welding material for high Cr ferritic heat-resistant steel, characterized in that a relationship of (Mo + W) / (Co + Cu) ≦ 1.5 is established between Cu contents, and the balance is Fe and inevitable impurities.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8272194A JPH07268563A (en) | 1994-03-30 | 1994-03-30 | Welding material for high cr ferritic heat resistant steel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8272194A JPH07268563A (en) | 1994-03-30 | 1994-03-30 | Welding material for high cr ferritic heat resistant steel |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH07268563A true JPH07268563A (en) | 1995-10-17 |
Family
ID=13782279
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8272194A Pending JPH07268563A (en) | 1994-03-30 | 1994-03-30 | Welding material for high cr ferritic heat resistant steel |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH07268563A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1123773A2 (en) * | 2000-02-07 | 2001-08-16 | Mitsubishi Heavy Industries, Ltd. | Weld material, gas metal arc welding method, and welded structure |
EP3928917A4 (en) * | 2019-02-21 | 2022-04-06 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Welding material for high-cr ferritic heat-resistant steels |
-
1994
- 1994-03-30 JP JP8272194A patent/JPH07268563A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1123773A2 (en) * | 2000-02-07 | 2001-08-16 | Mitsubishi Heavy Industries, Ltd. | Weld material, gas metal arc welding method, and welded structure |
US6303904B1 (en) | 2000-02-07 | 2001-10-16 | Mitsubishi Heavy Industries, Ltd. | Weld material, gas metal arc welding method, and welded structure |
EP1123773A3 (en) * | 2000-02-07 | 2003-11-26 | Mitsubishi Heavy Industries, Ltd. | Weld material, gas metal arc welding method, and welded structure |
EP3928917A4 (en) * | 2019-02-21 | 2022-04-06 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Welding material for high-cr ferritic heat-resistant steels |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0930127B1 (en) | Welding materials for high-Cr steels | |
JP3552517B2 (en) | Method for welding high Cr ferritic heat resistant steel and method for manufacturing welded steel pipe | |
JP2561592B2 (en) | Welding material for high Cr ferritic heat resistant steel | |
JP2742201B2 (en) | TIG welding wire for high strength Cr-Mo steel | |
JPS61113749A (en) | High corrosion resistance alloy for oil well | |
JPH08187592A (en) | Welding material for high cr ferritic heat resistant steel | |
JPH0543986A (en) | High chromium ferritic heat resisting steel reduced in deterioration in strength in weld heat-affected zone | |
JP2002331387A (en) | Welding wire for highly touch martensite based-stainless steel | |
JPH07292445A (en) | Duplex stainless clad steel, its production and welding method therefor | |
JP2594265B2 (en) | TIG welding wire for 9Cr-Mo steel | |
JPH07268563A (en) | Welding material for high cr ferritic heat resistant steel | |
JPH09308989A (en) | Welding material for high cr ferritic heat resistant steel | |
JP2551511B2 (en) | Welding material for high Cr ferritic heat resistant steel | |
JPH09122972A (en) | Coated electrode for high-cr ferrite heat resisting steel | |
JP3217567B2 (en) | Covered arc welding rod for high Cr ferritic heat resistant steel | |
JP3194207B2 (en) | Covered arc welding rod for high Cr ferritic heat resistant steel | |
JPH0770681A (en) | High chromium austenitic heat resistant alloy | |
JP2543801B2 (en) | Coated arc welding rod for high Cr ferritic heat resistant steel | |
JP3387145B2 (en) | High Cr ferritic steel with excellent high temperature ductility and high temperature strength | |
JP2551512B2 (en) | Welding material for high Cr ferritic heat resistant steel | |
JPS6376789A (en) | Submerged arc welding wire for 9cr-mo steel | |
JPH0753898B2 (en) | High strength austenitic heat resistant alloy | |
JPH06262388A (en) | Coated electrode for heat-resisting steel of high cr ferrite | |
JPH07268562A (en) | Coated rod for arc welding used for high cr ferritic heat resistant steel | |
JPH1136043A (en) | Steel for high temperature-high pressure vessel excellent in creep embrittlement resistance and reheat cracking resistance |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20020716 |