JPH04237592A - Welding material for perfect austenitic iron-based alloy having excellent high-temperature crack resistance - Google Patents
Welding material for perfect austenitic iron-based alloy having excellent high-temperature crack resistanceInfo
- Publication number
- JPH04237592A JPH04237592A JP1570691A JP1570691A JPH04237592A JP H04237592 A JPH04237592 A JP H04237592A JP 1570691 A JP1570691 A JP 1570691A JP 1570691 A JP1570691 A JP 1570691A JP H04237592 A JPH04237592 A JP H04237592A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- less
- welding material
- perfect
- austenitic
- 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
- 238000003466 welding Methods 0.000 title claims abstract description 50
- 239000000463 material Substances 0.000 title claims abstract description 47
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 33
- 239000000956 alloy Substances 0.000 title claims abstract description 33
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 15
- 239000012535 impurity Substances 0.000 claims abstract description 14
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 5
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 4
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 3
- 238000005336 cracking Methods 0.000 claims description 27
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 9
- 239000010953 base metal Substances 0.000 abstract description 7
- 229910052804 chromium Inorganic materials 0.000 abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 abstract description 3
- 229910052748 manganese Inorganic materials 0.000 abstract description 3
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 238000005728 strengthening Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、液化ガスなどを貯蔵
する極低温容器や、液体ヘリウム温度で運転される超電
導発電機用回転部材に適用されている完全オーステナイ
ト系鉄基合金を溶接する際に用いられる溶接材料に関す
るものである。[Industrial Application Field] This invention is useful for welding fully austenitic iron-based alloys that are applied to cryogenic containers for storing liquefied gas, etc., and rotating members for superconducting generators operated at liquid helium temperatures. This relates to welding materials used in
【０００２】0002
【従来の技術】オーステナイト系合金で、工業的に利用
されている合金には、鉄基と、ニッケル基の２種類があ
る。いずれも、加工性良好で、高い高温強度と、低温靭
性を有し、かつ、優れた耐食性を有することから、通常
の鉄鋼あるいはフェライト系ステンレス鋼が適用困難な
産業分野に利用されている。これらのオーステナイト系
合金は、溶融状態あるいは１０００〜１２００℃から加
熱急冷された状態では、体積率で３〜１０％程度のフェ
ライト組織を含有しているのが普通である。BACKGROUND OF THE INVENTION There are two types of austenitic alloys that are used industrially: iron-based and nickel-based. All of them have good workability, high high-temperature strength, low-temperature toughness, and excellent corrosion resistance, so they are used in industrial fields where it is difficult to apply ordinary steel or ferritic stainless steel. These austenitic alloys, in a molten state or in a state heated and rapidly cooled from 1000 to 1200° C., usually contain a ferrite structure in a volume fraction of about 3 to 10%.
【０００３】これに対し、完全オーステナイト系合金と
は、この様なフェライト組織が全く析出しないオーステ
ナイト系を指し、通常のオーステナイト系合金より多く
のニッケルを含有している。この完全オーステナイト系
合金の特徴は、−５０〜−２７３℃の極低温でも磁性を
示さず、極めて高い強度と延靭性を有する点にあり、液
化ガスの容器など多方面の極低温機器に利用されている
。また、特に、磁性を示さない点に着目し、液体ヘリウ
ム温度で運転される超電導発電機用回転部材への利用が
計画されている。On the other hand, a completely austenitic alloy refers to an austenitic alloy in which such a ferrite structure does not precipitate at all, and contains more nickel than a normal austenitic alloy. The characteristics of this fully austenitic alloy are that it does not exhibit magnetism even at extremely low temperatures of -50 to -273°C, and has extremely high strength and ductility.It is used in various cryogenic equipment such as liquefied gas containers. ing. Furthermore, with particular attention paid to the fact that it does not exhibit magnetism, it is planned to use it as a rotating member for a superconducting generator operated at liquid helium temperatures.
【０００４】ところで、この完全オーステナイト系合金
は、溶融状態から凝固あるいは冷却中に、高温割れを容
易に発生する欠点を有している。したがって、合金製造
時あるいは溶接時において、高温割れが発生しやすい。
特に、鉄基合金では、シェフラーの組織図上、比較的ニ
ッケル当量値の低い合金の高温割れ感受性が非常に高い
ことを本発明者らは見い出している。この様な極めて高
温割れ感受性の高い鉄基合金を接合する場合、溶接材料
（溶加材）を用いない拡散接合、電子ビーム溶接あるい
はロウ付けなどが適用されており、高温割れを完全に防
止するためには、従来、これらの接合方法が最適である
と考えられている。一方、オーステナイト系合金の溶接
方法としては、一般に、タングステンイナートガスアー
ク溶接（以下、ＧＴＡＷと呼ぶ）あるいはガスメタルア
ーク溶接（以下、ＧＭＡＷと呼ぶ）などが用いられてい
る。これらの方法では、溶加材を使わねばならず、溶接
金属に高温割れを発生することが多い。しかし、経済性
ならびに作業の容易性の観点から、オーステナイト系合
金の溶接にしばしば用いられている。However, this fully austenitic alloy has the disadvantage that hot cracking easily occurs during solidification or cooling from a molten state. Therefore, hot cracking is likely to occur during alloy manufacturing or welding. In particular, the present inventors have found that among iron-based alloys, alloys with relatively low nickel equivalent values on the Schaeffler's organizational diagram have extremely high hot cracking susceptibility. When joining iron-based alloys that are extremely sensitive to hot cracking, diffusion bonding, electron beam welding, or brazing, which do not use welding materials (filler metals), are used to completely prevent hot cracking. Conventionally, these bonding methods are considered to be optimal for this purpose. On the other hand, as a welding method for austenitic alloys, tungsten inert gas arc welding (hereinafter referred to as GTAW) or gas metal arc welding (hereinafter referred to as GMAW) is generally used. These methods require the use of filler metal and often cause hot cracking in the weld metal. However, from the viewpoint of economy and ease of work, it is often used for welding austenitic alloys.
【０００５】[0005]
【発明が解決しようとする課題】ところで、完全オース
テナイト系合金を用いた機器類の溶接個所の形状は、一
般に複雑であり、主として作業性の悪さから、電子ビー
ム溶接などの適用は極めて困難である。そのため、ＧＴ
ＡＷ、ＧＭＡＷなどの溶接方法を用いざるを得ず、これ
らの溶接方法を用いた場合、前述したように、溶接金属
の高温割れの発生が問題となる。[Problems to be Solved by the Invention] By the way, the shapes of welded parts of equipment using fully austenitic alloys are generally complex, and it is extremely difficult to apply electron beam welding mainly due to poor workability. . Therefore, GT
Welding methods such as AW and GMAW must be used, and when these welding methods are used, hot cracking of the weld metal becomes a problem as described above.
【０００６】従来、この問題解決のため、種々の試みが
なされているが、そのほとんどは、溶接材料として、完
全オーステナイト系合金母材とは異なった、耐高温割れ
性が優れた溶接材を使用するものである。このため、母
材部と溶接部との特性が大きく異なり、例えば、溶接金
属の強度が母材より低くなったり、あるいは、溶接金属
のみ非磁性を保てないなどの問題があり、満足な解決策
は得られていない。In the past, various attempts have been made to solve this problem, but most of them have involved using a welding material with excellent hot cracking resistance, which is different from the fully austenitic alloy base material. It is something to do. For this reason, the properties of the base metal and the welded part are significantly different, resulting in problems such as the strength of the weld metal being lower than that of the base metal, or the inability of the weld metal to maintain non-magnetic properties, which cannot be resolved satisfactorily. No solution has been found.
【０００７】本発明は、ＧＴＡＷ、ＧＭＡＷなどの溶接
方法で、完全オーステナイト系鉄基合金を溶接する際に
使用される溶接材料であって、耐高温割れ性に優れ、か
つ母材と共金からなる新規な溶接材料を提供することを
目的とする。The present invention is a welding material used when welding fully austenitic iron-based alloys by welding methods such as GTAW and GMAW, which has excellent hot cracking resistance and is compatible with the base metal. The purpose is to provide a new welding material that will
【０００８】[0008]
【課題を解決するための手段】本発明は、上記の従来技
術の問題点を解決するためになされたものであり、母材
と同等の性質を有し、Ｎｉ −Ｃｒ −Ｍｏ を主要成
分とする完全オーステナイト系鉄基合金を改良した溶接
材料である。すなわち、上記合金に、Ｃａ を添加し、
成分中のＳｉ含有量をある範囲にコントロールし、さら
に、Ｍｎ 、Ｖ、Ａｌ 、Ｔｉ を選択的に添加し、Ｐ
、Ｓ、Ｏの不可避的不純物の含有量を制限することによ
り、耐高温割れ性が著しく向上することを見出し、本発
明に到達した。[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems of the prior art. This is a welding material that is an improved fully austenitic iron-based alloy. That is, adding Ca to the above alloy,
The Si content in the components is controlled within a certain range, and Mn, V, Al, and Ti are selectively added, and P
, S, and O, it has been found that the hot cracking resistance can be significantly improved, and the present invention has been achieved.
【０００９】本発明の具体的な構成は、重量％で、Ｃ：
０．０１％以下、Ｓｉ ：０．０１〜０．０５％、Ｎｉ
：２０〜４０％、Ｃｒ ：１２〜２５％、Ｍｏ ：１
〜５％、Ｃａ： ０．００２〜０．０１５％を含有し、
残部がＦｅ および不可避的不純物からなり、かつ、不
可避的不純物のうち、Ｐ：０．００８％以下、Ｓ：０．
００３％以下、Ｏ：０．００３％以下を許容含有量とす
る耐高温割れ性に優れた完全オーステナイト系鉄基合金
用溶接材料を第１の発明とする。The specific composition of the present invention is, in weight %, C:
0.01% or less, Si: 0.01-0.05%, Ni
:20~40%, Cr:12~25%, Mo:1
~5%, Ca: 0.002~0.015%,
The remainder consists of Fe and unavoidable impurities, and of the unavoidable impurities, P: 0.008% or less, S: 0.
The first invention provides a welding material for fully austenitic iron-based alloys that has an allowable content of 0.003% or less and O: 0.003% or less and has excellent hot cracking resistance.
【００１０】第２の発明は、第１の発明の組成に選択的
成分を加えたものであり、具体的には、重量％で、Ｃ：
０．０１％以下、Ｓｉ ：０．０１〜０．０５％、Ｎｉ
：２０〜４０％、Ｃｒ ：１２〜２５％、Ｍｏ ：１
〜５％、Ｃａ ： ０．００２〜０．０１５％を含有し
、さらに、選択成分として、Ｍｎ ：０．５〜１．５％
、Ｖ：０．３％以下、Ａｌ ：０．３５％以下、Ｔｉ
：１〜３％の１種または２種以上を含有し、残部がＦｅ
および不可避的不純物からなり、かつ、不可避的不純
物のうち、Ｐ：０．００８％以下、Ｓ：０．００３％以
下、Ｏ：０．００３％以下を許容含有量とする耐高温割
れ性に優れた完全オーステナイト系鉄基合金用溶接材料
である。[0010] The second invention is one in which a selective component is added to the composition of the first invention, and specifically, in weight percent, C:
0.01% or less, Si: 0.01-0.05%, Ni
:20~40%, Cr:12~25%, Mo:1
~5%, Ca: 0.002~0.015%, and further contains Mn: 0.5~1.5% as a selective component.
, V: 0.3% or less, Al: 0.35% or less, Ti
: Contains 1 to 3% of one or more kinds, the balance being Fe.
and unavoidable impurities, and has excellent hot cracking resistance with allowable contents of P: 0.008% or less, S: 0.003% or less, and O: 0.003% or less. This is a welding material for completely austenitic iron-based alloys.
【００１１】[0011]
【作用】次に、本発明の溶接材料の作用を述べるに先立
ち、各成分の限定理由について述べる。なお、以下に述
べる含有量は、いずれも重量％である。Ｎｉ ：２０〜
４０％、Ｃｒ ：１２〜２５％、Ｍｏ ：１〜５％上記
成分範囲は、オーステナイト系鉄基合金において、完全
オーステナイト組織を得るために、必要な成分範囲であ
って、母材成分に準じて決められたものである。なお、
上記組織を確実に得るために、各成分は、さらに限定す
るのが望ましく、Ｎｉ ：２４〜２８％、Ｃｒ ：１２
〜１６％、Ｍｏ ：１〜３．５％の範囲とするのが好ま
しい。[Function] Next, before describing the function of the welding material of the present invention, the reason for limiting each component will be described. In addition, all the contents described below are weight %. Ni: 20~
40%, Cr: 12-25%, Mo: 1-5% The above component ranges are the component ranges necessary to obtain a completely austenitic structure in an austenitic iron-based alloy, and are based on the base material components. It is decided. In addition,
In order to reliably obtain the above structure, it is desirable to further limit each component, including Ni: 24-28% and Cr: 12%.
-16%, Mo: preferably in the range of 1-3.5%.
【００１２】Ｃ：０．０１％以下
Ｃは、凝固時の固−液共存領域を広め、かつ、高温での
延性を低下させて、溶接時の耐高温割れ性を低下させる
作用があるので、低めにするのが望ましい。したがって
、その上限は０．０１％とした。しかし、強度を考慮し
て、ある程度は含有させる必要がある。C: 0.01% or less C has the effect of widening the solid-liquid coexistence region during solidification, reducing ductility at high temperatures, and reducing hot cracking resistance during welding. It is desirable to keep it low. Therefore, the upper limit was set at 0.01%. However, in consideration of strength, it is necessary to include it to some extent.
【００１３】Ｓｉ ：０．０１〜０．０５％Ｓｉ は、
Ｃと同様に高温割れを助長する作用があるため、その上
限を０．０５％とした。しかし、含有量をあまり下げす
ぎると、溶接時、溶融状態の溶接材料の母材へのぬれ性
が悪くなり、溶接欠陥が発生しやすくなる。
また、含有量が少なすぎると、脱酸効果もなくなるので
、その下限は０．０１％とした。[0013]Si: 0.01-0.05%Si is
Like C, it has the effect of promoting hot cracking, so its upper limit was set at 0.05%. However, if the content is too low, the wettability of the molten welding material to the base metal during welding will deteriorate, making welding defects more likely to occur. Moreover, if the content is too small, the deoxidizing effect will be lost, so the lower limit was set at 0.01%.
【００１４】Ｃａ ：０．００２〜０．０１５％Ｃａ
は、高温割れを引き起こす有害元素であるＳと化合物を
つくり、スラグ化して、材料中からＳを除去する、いわ
ゆる脱硫作用があり、その作用を発揮するためには、０
．００２％以上添加させる必要がある。しかし、０．０
１５％を超えてＣａ を含有させると、過剰のＣａ 酸
化物を形成し、それが、溶接金属中に残存し、耐食性を
劣化させるため、上限を０．０１５％とした。[0014]Ca: 0.002-0.015%Ca
has a so-called desulfurization effect, which creates a compound with S, a harmful element that causes high-temperature cracking, and removes S from the material by turning it into slag.
．． It is necessary to add 0.02% or more. However, 0.0
When Ca is contained in an amount exceeding 15%, excessive Ca oxide is formed, which remains in the weld metal and deteriorates corrosion resistance, so the upper limit is set to 0.015%.
【００１５】次に、不可避的不純物の許容含有量を説明
する。
Ｐ：０．００８％以下
Ｐは、不可避的不純物であり、極力低減するのが好まし
く、０．００８％を超えて含有すると、凝固時に濃化が
著しくなり、濃化部に高温割れを発生せしめるため、そ
の許容含有量を０．００８％に制限した。Next, the permissible content of unavoidable impurities will be explained. P: 0.008% or less P is an unavoidable impurity, and it is preferable to reduce it as much as possible. If it is contained in excess of 0.008%, concentration will become significant during solidification, causing hot cracking to occur in the concentrated portion. Therefore, its permissible content was limited to 0.008%.
【００１６】Ｓ：０．００３％以下
Ｓは、０．００３％を超えて含有させると、溶接時に低
融点の化合物となって、高温割れを引き起こす作用があ
るため、本発明では、Ｃａ を添加して、積極的に脱硫
を行い、不可避的不純物としてのＳの許容含有量を０．
００３％以下に制限した。[0016] S: 0.003% or less If S is contained in an amount exceeding 0.003%, it becomes a compound with a low melting point during welding and has the effect of causing hot cracking. Therefore, in the present invention, Ca is added. Then, active desulfurization is carried out to reduce the allowable content of S as an unavoidable impurity to 0.
It was limited to 0.003% or less.
【００１７】Ｏ：０．００３％以下
Ｏは、溶接材料中に多く含有されると、酸化物として粒
界に析出し、高温割れを助長するため、その含有量は低
いほど好ましいが、０．００３％以下であれば、ほとん
ど高温割れの発生に影響しないので、不可避的不純物と
してのＯの許容含有量を０．００３％以下に制限した。O: 0.003% or less When O is contained in a large amount in the welding material, it precipitates in the grain boundaries as an oxide and promotes hot cracking, so the lower the content, the better. If it is 0.003% or less, it will hardly affect the occurrence of hot cracking, so the allowable content of O as an unavoidable impurity was limited to 0.003% or less.
【００１８】次に、第２の発明で、選択的に含有させる
成分の限定理由を述べる。
Ｍｎ ：０．５〜１．５％
Ｍｎ は、Ｎｉ と同様にオーステナイト安定化元素で
あるが、強化作用とともに、溶接時に脱酸作用があるた
め必要な元素である。強化作用と脱酸の必要上、０．５
％以上必要であり、また、１．５％を越えると、靭性の
低下が著しいため上記範囲とした。Next, in the second invention, the reasons for limiting the components to be selectively included will be described. Mn: 0.5 to 1.5% Mn is an austenite stabilizing element like Ni, but is a necessary element because it has a strengthening effect and a deoxidizing effect during welding. Due to the need for strengthening and deoxidation, 0.5
% or more, and if it exceeds 1.5%, the toughness decreases significantly, so the above range was set.
【００１９】Ｖ：０．３％以下
Ｖは、強化作用の大きい元素であるが、その添加量が０
．３％を越えると、延靭性が低下する。したがって、そ
の添加量を０．３％以下とした。V: 0.3% or less V is an element with a strong strengthening effect, but if the amount added is 0.
．． When it exceeds 3%, ductility and toughness decrease. Therefore, the amount added was set to 0.3% or less.
【００２０】Ａｌ ：０．３５％以下
Ａｌ は、脱酸作用と同時に他の元素と化合して析出物
を生成し、強化作用を発揮するが、０．３５％を越える
と脆化が著しく、また、脱酸生成物が粗大になり欠陥発
生の原因となる。したがって、添加量を０．３５％以下
とした。Al: 0.35% or less Al has a deoxidizing effect and at the same time combines with other elements to form precipitates and exerts a strengthening effect, but when it exceeds 0.35%, embrittlement becomes significant. Further, the deoxidized product becomes coarse and causes defects. Therefore, the amount added was set to 0.35% or less.
【００２１】Ｔｉ ：１〜３％
Ｔｉ は、オーステナイト合金の強化元素として１％以
上必要であるが、３％を越えると、脆化が著しく、また
、粗大な炭化物あるいは窒化物が生成し、強度ならびに
靭性の低下を招く。したがって、１〜３％とした。Ti: 1 to 3% Ti is necessary as a strengthening element for austenitic alloys in an amount of 1% or more, but if it exceeds 3%, embrittlement will be significant, and coarse carbides or nitrides will be formed, reducing the strength. as well as a decrease in toughness. Therefore, it was set at 1 to 3%.
【００２２】すなわち、本願発明によれば、完全オース
テナイト系合金が有する特性が確保されて、母材の特性
との不整合をなくすとともに、高温での割れ発生が有効
に防止される。That is, according to the present invention, the properties of a fully austenitic alloy are ensured, the mismatch with the properties of the base material is eliminated, and the occurrence of cracks at high temperatures is effectively prevented.
【００２３】[0023]
【実施例】以下に、この発明の実施例を、比較例（従来
例）と比較しつつ説明する。表１に示される組成を有す
る母材を用いて、図１、図２に示すように、中央に丸穴
を有する角柱状の母材１と、前記丸穴内に挿入される円
柱状の母材１´とを用意した。上記母材１，１´の対向
壁には、断面Ｕ形になる開先２を形成してある。なお、
母材１は、拘束基台３の上部に、拘束基台取り付け溶接
部４を介して溶接固定されたものである。[Embodiments] Examples of the present invention will be explained below while comparing them with comparative examples (conventional examples). Using a base material having the composition shown in Table 1, as shown in FIGS. 1 and 2, a prismatic base material 1 having a round hole in the center and a cylindrical base material inserted into the round hole are used. 1' was prepared. A groove 2 having a U-shaped cross section is formed on the opposing walls of the base materials 1 and 1'. In addition,
The base material 1 is welded and fixed to the upper part of the restraint base 3 via the restraint base attachment welding part 4 .
【００２４】また、表１に示す組成を有する本発明材Ａ
は、第１の発明に該当する組成を有し、完全オーステナ
イト系合金としての性質を有している。また、比較材は
、同じく完全オーステナイト系合金としての性質を有す
るが、本発明の範囲外の組成を有するものである。これ
ら材料を、それぞれ１．２ｍｍ径のワイヤに成形して溶
接材料とした。ＧＴＡＷ法によって、上記ワイヤを供給
しながら前記開先２を肉盛り溶接した。なお、溶接は、
表２に示された条件で、６パスの累層溶接によって行っ
た。溶接後、得られたテスト溶接部５の溶接割れを検査
するため、放射線透過試験を行い、テスト溶接部５を観
察した。その結果は、表１の判定欄に示した。In addition, the present invention material A having the composition shown in Table 1
has a composition corresponding to the first invention and has properties as a fully austenitic alloy. Further, the comparative material similarly has the properties of a fully austenitic alloy, but has a composition outside the scope of the present invention. These materials were each formed into wires with a diameter of 1.2 mm to obtain welding materials. The groove 2 was overlay-welded by the GTAW method while supplying the wire. In addition, welding is
Six-pass stack welding was performed under the conditions shown in Table 2. After welding, in order to inspect the resulting test weld 5 for weld cracks, a radiographic test was conducted and the test weld 5 was observed. The results are shown in the judgment column of Table 1.
【００２５】[0025]
【表１】
なお、判定欄は、×：割れ状況大、△：割れ状況軽微、
○：割れなしを示す。[Table 1] The judgment column is: ×: Severe cracking, △: Slight cracking,
○: Indicates no cracking.
【００２６】[0026]
【表２】[Table 2]
【００２７】表１に示すように、本発明材Ａを溶接材料
として用いた場合には、溶接部に割れの発生は認められ
なかった。これに対し、比較材を用いた場合には、いず
れも溶接部に割れの発生が認められ、溶接材料としては
不適当であった。As shown in Table 1, when the material A of the present invention was used as a welding material, no cracking was observed in the welded area. On the other hand, when comparative materials were used, cracks were observed in the welded areas, making them unsuitable as welding materials.
【００２８】また、表３および表４に示す組成を有する
発明材Ｂ、Ｃは、第２の発明に該当する組成を有するも
のであり、発明材Ａと同様に、これらをワイヤ形状の溶
接材料に成形して、同様の条件で溶接および溶接部の観
察を行った。なお、発明材Ｂは、不可避的不純物のうち
、Ｐ、Ｓ、Ｏの含有量が測定不能であったものであり、
発明材Ｃは、これら成分が微量含まれていたものである
。各発明材の溶接部には、表３、４の判定欄に、表１と
同様に表示したように、いずれも割れの発生は認められ
ず、良好な溶接部が得られた。Furthermore, invention materials B and C having the compositions shown in Tables 3 and 4 have compositions corresponding to the second invention, and similarly to invention material A, they are used as wire-shaped welding materials. The welded parts were welded and the welded parts were observed under the same conditions. Inventive material B was one in which the content of P, S, and O among the inevitable impurities was unmeasurable,
Invention material C contained trace amounts of these components. As indicated in the judgment columns of Tables 3 and 4 in the same manner as in Table 1, no cracking was observed in the welded parts of each invention material, and good welded parts were obtained.
【００２９】[0029]
【表３】[Table 3]
【００３０】[0030]
【表４】[Table 4]
【００３１】[0031]
【発明の効果】以上説明したように、本願発明は、母材
と同等の性質を有する完全オーステナイト系鉄基合金を
改良して、母材の性質を維持したままで、耐高温割れ性
を向上させた溶接材料としたので、完全オーステナイト
系鉄基合金からなる部材を、溶接材料を用いて、割れを
発生させることなく溶接することができる。したがって
、割れのない、母材と同等の性質を有する溶接部が形成
され、母材特性との整合が得られ、均質な特性を有する
溶接部材を得ることができる効果がある。また、上記し
たように、溶接作業を、溶接材料を用いたＧＴＡＷ法な
どによって行うことができるので、溶接作業を経済的に
、しかも、能率よく行うことができる効果がある。[Effects of the Invention] As explained above, the present invention improves a fully austenitic iron-based alloy that has properties equivalent to those of the base material, and improves hot cracking resistance while maintaining the properties of the base material. Since the welding material is used, members made of a completely austenitic iron-based alloy can be welded using the welding material without causing cracks. Therefore, a welded part without cracks and having properties equivalent to those of the base metal is formed, and there is an effect that matching with the properties of the base metal is obtained, and a welded member having homogeneous properties can be obtained. Furthermore, as described above, the welding work can be performed by the GTAW method using welding materials, so there is an effect that the welding work can be performed economically and efficiently.
【図１】溶接試験片の平面図。FIG. 1 is a plan view of a welding test piece.
【図２】同じく中央縦断面図である。FIG. 2 is a central vertical cross-sectional view.
１ 試験材 １´ 試験材 ２ 開先 ３ 拘束基台 ４ 拘束基台取り付け溶接部 ５ テスト溶接部 1 Test material 1´ Test material 2 Bevel 3. Restraint base 4. Restraint base attachment welded part 5 Test welding area
Claims (2)
：０．０１〜０．０５％、Ｎｉ ：２０〜４０％、Ｃ
ｒ ：１２〜２５％、Ｍｏ ：１〜５％、Ｃａ ： ０
．００２〜０．０１５％を含有し、残部がＦｅ および
不可避的不純物からなり、かつ、不可避的不純物のうち
、Ｐ：０．００８％以下、Ｓ：０．００３％以下、Ｏ：
０．００３％以下を許容含有量とする耐高温割れ性に優
れた完全オーステナイト系鉄基合金用溶接材料Claim 1: C: 0.01% or less, Si
:0.01~0.05%, Ni:20~40%, C
r: 12-25%, Mo: 1-5%, Ca: 0
．． 002 to 0.015%, the balance consists of Fe and unavoidable impurities, and among the unavoidable impurities, P: 0.008% or less, S: 0.003% or less, O:
Welding material for fully austenitic iron-based alloys with excellent hot cracking resistance and an allowable content of 0.003% or less
：０．０１〜０．０５％、Ｎｉ ：２０〜４０％、Ｃ
ｒ ：１２〜２５％、Ｍｏ ：１〜５％、Ｃａ ： ０
．００２〜０．０１５％を含有し、さらに、選択成分と
して、Ｍｎ ：０．５〜１．５％、Ｖ：０．３％以下、
Ａｌ ：０．３５％以下、Ｔｉ ：１〜３％の１種また
は２種以上を含有し、残部がＦｅ および不可避的不純
物からなり、かつ、不可避的不純物のうち、Ｐ：０．０
０８％以下、Ｓ：０．００３％以下、Ｏ：０．００３％
以下を許容含有量とする耐高温割れ性に優れた完全オー
ステナイト系鉄基合金用溶接材料Claim 2: C: 0.01% or less, Si
:0.01~0.05%, Ni:20~40%, C
r: 12-25%, Mo: 1-5%, Ca: 0
．． 002 to 0.015%, and further includes Mn: 0.5 to 1.5%, V: 0.3% or less,
Contains one or more of Al: 0.35% or less, Ti: 1 to 3%, and the remainder consists of Fe and unavoidable impurities, and among the unavoidable impurities, P: 0.0
08% or less, S: 0.003% or less, O: 0.003%
Welding materials for fully austenitic iron-based alloys with excellent hot cracking resistance with the following allowable content:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1570691A JPH04237592A (en) | 1991-01-17 | 1991-01-17 | Welding material for perfect austenitic iron-based alloy having excellent high-temperature crack resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1570691A JPH04237592A (en) | 1991-01-17 | 1991-01-17 | Welding material for perfect austenitic iron-based alloy having excellent high-temperature crack resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04237592A true JPH04237592A (en) | 1992-08-26 |
Family
ID=11896213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1570691A Pending JPH04237592A (en) | 1991-01-17 | 1991-01-17 | Welding material for perfect austenitic iron-based alloy having excellent high-temperature crack resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04237592A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001107196A (en) * | 1999-10-07 | 2001-04-17 | Sumitomo Metal Ind Ltd | Austenitic steel welded joint excellent in weld cracking resistance and sulfuric acid corrosion resistance and the welding material |
| JP2005522021A (en) * | 2002-02-15 | 2005-07-21 | アンフイ・アロイ | Soft magnetic alloys for watchmaking |
| JP2018537291A (en) * | 2015-11-10 | 2018-12-20 | スコペルタ・インコーポレイテッドＳｃｏｐｅｒｔａ， Ｉｎｃ． | Antioxidation twin wire arc spray material |
| US11939646B2 (en) | 2018-10-26 | 2024-03-26 | Oerlikon Metco (Us) Inc. | Corrosion and wear resistant nickel based alloys |
-
1991
- 1991-01-17 JP JP1570691A patent/JPH04237592A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001107196A (en) * | 1999-10-07 | 2001-04-17 | Sumitomo Metal Ind Ltd | Austenitic steel welded joint excellent in weld cracking resistance and sulfuric acid corrosion resistance and the welding material |
| JP2005522021A (en) * | 2002-02-15 | 2005-07-21 | アンフイ・アロイ | Soft magnetic alloys for watchmaking |
| JP2018537291A (en) * | 2015-11-10 | 2018-12-20 | スコペルタ・インコーポレイテッドＳｃｏｐｅｒｔａ， Ｉｎｃ． | Antioxidation twin wire arc spray material |
| JP2021164961A (en) * | 2015-11-10 | 2021-10-14 | スコペルタ・インコーポレイテッドScoperta, Inc. | Oxidation controlled twin wire arc spray materials |
| US11939646B2 (en) | 2018-10-26 | 2024-03-26 | Oerlikon Metco (Us) Inc. | Corrosion and wear resistant nickel based alloys |
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