JP2003221634A - Heat-resistant high-chromium high-nickel alloy - Google Patents
Heat-resistant high-chromium high-nickel alloyInfo
- Publication number
- JP2003221634A JP2003221634A JP2002024500A JP2002024500A JP2003221634A JP 2003221634 A JP2003221634 A JP 2003221634A JP 2002024500 A JP2002024500 A JP 2002024500A JP 2002024500 A JP2002024500 A JP 2002024500A JP 2003221634 A JP2003221634 A JP 2003221634A
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- Prior art keywords
- corrosion
- corrosion resistance
- chromium
- workability
- heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は高クロム−高ニッケ
ル系耐熱合金に関し、さらに詳しくは、高温における耐
食性が重要となる化学プラントにおける周辺機器や改質
炉、あるいは固体電解質型燃料電池の周辺部材などの材
料として好適に用いられる高クロム−高ニッケル系耐熱
合金の改良に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-chromium-high-nickel heat-resistant alloy, and more specifically, peripheral equipment and reforming furnaces in chemical plants where corrosion resistance at high temperatures is important, or peripheral members for solid oxide fuel cells. The present invention relates to an improvement of a high chromium-high nickel heat resistant alloy which is preferably used as a material such as
【０００２】[0002]
【従来の技術】従来より、高温使用条件の耐食材料とし
ては、種々の材料が開発されてきており、代表的な材料
としてインコロイ８００合金（商品名）がある。例え
ば、熱効率の改善を目的とするような高温高圧ボイラで
は、従来のボイラに比較して、蒸気条件が高温・高圧化
されているため、高温強度や耐食性に対する一層厳しい
要求性能を満たさなければならない。このようなことか
ら、酸化雰囲気下での使用に耐える材料として、特開平
８−２１８１４０号公報に記載される重量％でＮｉ３５
〜６０％、Ｃｒ２８〜３８％を含有する高クロム−高ニ
ッケル系耐熱合金が開発されている。2. Description of the Related Art Conventionally, various materials have been developed as a corrosion resistant material under high temperature use conditions, and a typical material is Incoloy 800 alloy (trade name). For example, in a high-temperature and high-pressure boiler for the purpose of improving thermal efficiency, the steam conditions are higher in temperature and pressure than in conventional boilers, so more stringent requirements for high-temperature strength and corrosion resistance must be met. . Therefore, as a material that can withstand use in an oxidizing atmosphere, Ni35 in a weight percentage of Ni35 described in JP-A-8-218140 is used.
A high-chromium-high-nickel-based heat-resistant alloy containing -60% and 28-38% Cr has been developed.
【０００３】さらに、ＣＯ、ＣＨ4を多く含む、５００
℃以上のガス雰囲気下において生じる腐食（浸炭腐
食）、あるいは、該浸炭腐食がさらに進行した腐食（メ
タルダスティングコロージョン）に対する耐食性の高い
材料として、特開２００１−２７９３９５号公報に記載
される重量％でＮｉ＋２Ｃｒ＞１００％、Ｓｉ１．０〜
５．０％、Ｙ０．１〜１．０％を含有する高クロム−高
ニッケル系耐熱合金が開発されている。ここで、浸炭腐
食とは、ＣＯやＣＨ4中の炭素原子が腐食する材料の表
面に付着した後、該材料中に拡散浸透して材料の靭性を
低下させる腐食のことであり、メタルダスティングコロ
ージョンとは、浸炭腐食した箇所で、さらに減肉が起こ
るような腐食であり、腐食箇所が粉状に崩れていくもの
である。Further, 500 containing a large amount of CO and CH 4
As a material having high corrosion resistance to corrosion (carburizing corrosion) that occurs in a gas atmosphere of ℃ or more (carburizing corrosion), or corrosion (metal dusting corrosion) in which the carburizing corrosion is further advanced, the weight% described in JP 2001-279395 A Ni + 2Cr> 100%, Si1.0 ~
A high chromium-high nickel heat resistant alloy containing 5.0% and Y0.1 to 1.0% has been developed. Here, carburizing corrosion refers to corrosion in which carbon atoms in CO or CH 4 are attached to the surface of a corroding material and then diffuse and permeate into the material to lower the toughness of the material. Corrosion is corrosion in which carburization and corrosion are more likely to occur in the carburized and corroded part, and the corroded part is broken into powder.
【０００４】一方、燃料電池の分野においても、浸炭腐
食に耐え得る耐食材料が必要とされてきている。例え
ば、固体電解質型燃料電池ではＣＯを多く含む改質ガス
の使用に伴い、電池部分へガスを供給する配管で浸炭環
境となる場合がある。電池及び周辺部には耐久性のある
材料が望まれており、長時間の運転に際しても安定した
電力供給を可能にする必要がある。On the other hand, also in the field of fuel cells, there is a need for a corrosion resistant material that can withstand carburizing corrosion. For example, in a solid oxide fuel cell, when a reformed gas containing a large amount of CO is used, a pipe for supplying gas to the cell portion may be in a carburizing environment. A durable material is desired for the battery and its peripheral portion, and it is necessary to enable stable power supply even during long-term operation.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、前述の
特開平８−２１８１４０号公報に記載される高クロム−
高ニッケル系耐熱合金では、ＣＯ、ＣＨ4を多く含む、
浸炭腐食及びメタルダスティングコロージョンに対する
耐食性が十分でない問題がある。また、合金中における
ＮｉおよびＣｒの含有量を一定以上に規定し、Ｓｉおよ
びＹを含有して、これら浸炭腐食とメタルダスティング
コロージョンに対する耐食性を改善した材料として前述
の特開２００１−２７９３９５号公報に記載された材料
が開発されたが、高Ｃｒ高Ｓｉのために加工性が低く鍛
造時に割れが生じるなどの問題がある。However, the high chromium content described in the above-mentioned JP-A-8-218140.
The high nickel heat resistant alloy contains a large amount of CO and CH 4 ,
There is a problem that the corrosion resistance to carburizing corrosion and metal dusting corrosion is not sufficient. Further, as a material in which the contents of Ni and Cr in the alloy are regulated above a certain level and Si and Y are contained to improve the carburizing corrosion and the corrosion resistance to metal dusting corrosion, the above-mentioned JP 2001-279395 A is disclosed. Although the material described in 1) has been developed, it has a problem that the workability is low due to high Cr and high Si and cracks occur during forging.
【０００６】本発明は、このような問題点を解消するた
めになされたもので、浸炭腐食及びメタルダスティング
コロージョンに対する耐食性と加工性に優れた高クロム
−高ニッケル系耐熱合金の提供を目的とする。The present invention has been made to solve the above problems, and an object thereof is to provide a high chromium-high nickel heat resistant alloy having excellent corrosion resistance against carburizing corrosion and metal dusting corrosion and excellent workability. To do.
【０００７】[0007]
【課題を解決するための手段】本発明者らは、高Ｃｒ高
Ｎｉ系耐熱合金の浸炭腐食及びメタルダスティングコロ
ージョンに対する耐食性と加工性に及ぼす合金成分の影
響を究明し、Ｃｒ、Ｓｉ、Ｙを低減させてもＡｌを適正
量含有させることにより耐食性が高く、鍛造時の割れも
生じないことを知見し、本発明に至った。DISCLOSURE OF THE INVENTION The present inventors have investigated the effects of alloying components on the corrosion resistance and workability of carburizing corrosion and metal dusting corrosion of high Cr high Ni heat resistant alloys, and have investigated Cr, Si and Y. It was found that the corrosion resistance is high and cracks do not occur at the time of forging by containing an appropriate amount of Al even if the amount of Al is reduced.
【０００８】本発明はかかる知見に基づいてなされたも
のであって、重量％でＣｒ２０．０〜３３．０％、Ｎｉ
３０．０〜６０．０％（ただし、Ｎｉ＋２Ｃｒ＞１００
％）、Ｓｉ１．０〜５．０％、Ｍｎ０．５％以下、Ａｌ
０．５〜２．５％、Ｙ０．４％以下、Ｃ０．０２〜０．
１％を含有し、残部Ｆｅおよび不可避不純物からなるこ
とを特徴とする高クロム−高ニッケル系耐熱合金であ
る。The present invention has been made on the basis of the above findings, in which Cr 20.0 to 33.0% by weight and Ni.
30.0-60.0% (however, Ni + 2Cr> 100
%), Si 1.0 to 5.0%, Mn 0.5% or less, Al
0.5-2.5%, Y 0.4% or less, C 0.02-0.
A high chromium-high nickel heat resistant alloy containing 1% and the balance being Fe and inevitable impurities.
【０００９】より優れた耐食性を維持する場合には、前
記（Ｎｉ＋２Ｃｒ）が重量％でＮｉ＋２Ｃｒ≧１１０％
である高クロム−高ニッケル系耐熱合金組成が好まし
い。さらに、安定した耐食性と加工性を兼備する場合に
は、前記Ｓｉ、ＡｌおよびＹが重量％で、Ｓｉ１．０〜
２．５％、Ａｌ０．８〜２．０％、Ｙ０．０１〜０．１
％である高クロム−高ニッケル系耐熱合金組成が好まし
い。In order to maintain a better corrosion resistance, the above (Ni + 2Cr) is weight% and Ni + 2Cr ≧ 110%.
A high chromium-high nickel heat-resistant alloy composition is preferred. Further, in the case of having both stable corrosion resistance and workability, the Si, Al and Y are in the weight% of Si 1.0 to
2.5%, Al 0.8-2.0%, Y0.01-0.1
%, A high chromium-high nickel heat resistant alloy composition is preferable.
【００１０】[0010]
【発明の実施の形態】次に、本発明の高クロム−高ニッ
ケル系耐熱合金の化学成分の限定理由について詳述す
る。BEST MODE FOR CARRYING OUT THE INVENTION Next, the reasons for limiting the chemical composition of the high chromium-high nickel heat resistant alloy of the present invention will be described in detail.
【００１１】Ｃｒ２０．０〜３３．０％：Ｃｒは材料の
表面に安定な酸化皮膜を形成することにより、ガス中か
ら材料中へのＣの侵入を防止する。これにより、耐酸化
性、耐水蒸気性あるいは耐腐食性の改善に優れた効果を
発揮するもので、２０．０％以上含有する必要がある。
しかし、３３．０％を超えると加工性の低下を招く。し
たがって、Ｃｒ含有量は２０．０〜３３．０％とする。
望ましいＣｒ含有量は、２３．０〜３０．０％である。Cr 20.0 to 33.0%: Cr forms a stable oxide film on the surface of the material and prevents C from penetrating from the gas into the material. As a result, it exhibits an excellent effect of improving oxidation resistance, water vapor resistance or corrosion resistance, and it is necessary to contain 20.0% or more.
However, if it exceeds 33.0%, the workability is deteriorated. Therefore, the Cr content is set to 20.0 to 33.0%.
A desirable Cr content is 23.0 to 30.0%.
【００１２】Ｎｉ３０．０〜６０．０％：Ｎｉはオース
テナイト組織を安定化させ、靭性を高めるために必要な
元素であり、３０．０％以上含有する必要がある。しか
し、６０．０％を超えると硫化腐食に対する耐食性が低
下すると同時に材料コストのアップを招く。したがっ
て、Ｎｉ含有量は３０．０〜６０．０％とする。望まし
いＮｉ含有量は、４５．０〜５５．０％である。Ni 30.0 to 60.0%: Ni is an element necessary for stabilizing the austenite structure and enhancing the toughness, and it is necessary to contain 30.0% or more. However, if it exceeds 60.0%, the corrosion resistance to sulfidation corrosion decreases and at the same time the material cost increases. Therefore, the Ni content is set to 30.0 to 60.0%. A desirable Ni content is 45.0 to 55.0%.
【００１３】Ｎｉ＋２Ｃｒ＞１００％または≧１１０
％：浸炭腐食及びメタルダスティングコロージョンに対
する耐食性を発揮するためには、適正量のＳｉ、Ｙを含
有するほかに、ＮｉとＣｒの総量としてＮｉ＋２Ｃｒの
含有量を１００％を超えて含有する必要があり、より優
れた耐食性を維持するためにはＮｉ＋２Ｃｒ≧１１０％
が好ましい。Ni + 2Cr> 100% or ≧ 110
%: In order to exert the corrosion resistance against carburizing corrosion and metal dusting corrosion, it is necessary to contain not less than 100% of Ni + 2Cr as the total amount of Ni and Cr in addition to containing appropriate amounts of Si and Y. Yes, Ni + 2Cr ≧ 110% to maintain better corrosion resistance
Is preferred.
【００１４】Ｓｉ１．０〜５．０％：Ｓｉは一般的には
脱酸剤として添加されるが、耐酸化性の改善に寄与する
元素であると同時に、結晶粒界に析出し、粒界を通るＣ
の侵入を抑制する効果があり、１．０％以上の含有が必
要である。しかし、５．０％を超えて含有すると組織の
安定性が悪くなるので、Ｓｉの含有量は１．０〜５．０
％とする。Ａｌの適正量の含有により加工性の改善を考
慮し、Ｓｉのより好ましい含有量は１．０〜２．５％で
ある。Si 1.0-5.0%: Si is generally added as a deoxidizing agent, but it is an element contributing to the improvement of oxidation resistance, and at the same time, it precipitates at the crystal grain boundaries and becomes grain boundaries. Passing through C
Has the effect of suppressing the invasion of Al, and must be contained at 1.0% or more. However, if the content exceeds 5.0%, the stability of the structure deteriorates, so the Si content is 1.0 to 5.0.
%. Considering the improvement of workability by containing an appropriate amount of Al, the more preferable content of Si is 1.0 to 2.5%.
【００１５】Ｍｎ０．５％以下：Ｍｎは一般的には脱酸
剤として添加されるが、０．５％を超えて含有されると
スピネル型の酸化皮膜が多くなって合金の耐水蒸気酸化
性が低下するので０．５％以下とする。Mn 0.5% or less: Mn is generally added as a deoxidizer, but if it exceeds 0.5%, the spinel type oxide film increases and the steam oxidation resistance of the alloy increases. Is decreased, so 0.5% or less.
【００１６】Ａｌ０．５〜２．５％：本発明の高Ｃｒ高
Ｎｉ系耐熱合金において、加工性の劣化を低いレベルに
抑えつつ、浸炭腐食及びメタルダスティングコロージョ
ンに対する耐食性を改善する元素として必要不可欠な元
素である。ＡｌはＣｒ主体の酸化膜の粒界および皮膜の
内層で緻密なＡｌ2Ｏ3を形成することにより、皮膜の粒
界からの炭素の侵入を抑制すると共に、Ｃｒ皮膜から侵
入する炭素の更なる侵入を抑制する。高Ｃｒ高Ｎｉ系耐
熱合金の加工性を改善するためにＣｒ、Ｓｉ、Ｙの含有
量を低減させることが有効であるが、Ａｌを０．５％以
上含有すれば優れた耐食性を確保できる。加工性を劣化
させることなく耐食性を確保するためにＡｌの含有が効
果的であるが、２．５％を超えて含有すると加工性が低
下する。したがって、Ａｌの含有量は０．５〜２．５％
であり、安定した耐食性と加工性を兼備するためには
０．８〜２．０％が好ましく、特に好ましくは０．９〜
１．５％である。Al 0.5 to 2.5%: In the high Cr, high Ni heat resistant alloy of the present invention, necessary as an element for improving corrosion resistance to carburizing corrosion and metal dusting corrosion while suppressing deterioration of workability to a low level. It is an essential element. Al suppresses the invasion of carbon from the grain boundary of the film by forming dense Al 2 O 3 at the grain boundary of the oxide film mainly composed of Cr and the inner layer of the film, and further increases the carbon invading from the Cr film. Control the intrusion. It is effective to reduce the contents of Cr, Si, and Y in order to improve the workability of the high Cr high Ni heat resistant alloy, but if Al is contained in an amount of 0.5% or more, excellent corrosion resistance can be secured. It is effective to contain Al in order to secure the corrosion resistance without deteriorating the workability, but if it exceeds 2.5%, the workability is deteriorated. Therefore, the Al content is 0.5 to 2.5%.
In order to have stable corrosion resistance and workability, 0.8 to 2.0% is preferable, and 0.9 to 2.0 is particularly preferable.
It is 1.5%.
【００１７】Ｙ０．４％以下（０％も含む）：Ｙは合金
中の微量不純物であるＳを硫化物として合金母材中に固
定すると同時に、酸化皮膜と母材の境界に析出して皮膜
の密着性を高め、高温使用時における耐水蒸気酸化性な
どを向上させると同時に、耐食性も向上させる元素であ
り、必要により０．４％以下の範囲で含有する。含有量
が多くなると加工性を低下させるので、適正量のＡｌの
含有により耐食性と加工性を兼備するためには０．０１
〜０．１％の含有が好ましい。Y 0.4% or less (including 0%): Y fixes S, which is a trace impurity in the alloy, as a sulfide in the alloy base material, and at the same time, deposits on the boundary between the oxide film and the base material to form a film. Is an element that enhances the adhesiveness, improves the steam oxidation resistance at the time of high temperature use, and at the same time improves the corrosion resistance. If necessary, it is contained in the range of 0.4% or less. Since the workability is deteriorated when the content is increased, it is necessary to add 0.01% in order to combine the corrosion resistance and the workability by containing an appropriate amount of Al.
A content of 0.1% is preferable.
【００１８】Ｃ：０．０２〜０．１％：Ｃは炭化物を形
成して耐熱合金として必要な引張強さやクリープ破断強
度を向上させるために必要な元素であり、０．０２％以
上含有する。しかし、０．１％を超えると合金の靭性の
低下が大きくなるので、Ｃの含有量は０．０２〜０．１
％である。C: 0.02 to 0.1%: C is an element necessary for forming a carbide to improve the tensile strength and creep rupture strength required as a heat resistant alloy, and is contained in 0.02% or more. . However, if the content of C exceeds 0.1%, the toughness of the alloy is greatly reduced, so the C content is 0.02 to 0.1.
%.
【００１９】本発明の高クロム−高ニッケル系耐熱合金
を実施例によりさらに具体的に説明するが、本発明はこ
れらの実施例によって何ら限定されるものではない。The high chromium-high nickel heat resistant alloy of the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
【００２０】[0020]
【実施例】表１に示す化学成分の２４種類の合金を高周
波溶解炉で溶製し、得られた各インゴットを鍛造、冷間
圧延し、固溶化熱処理を施したものから試験片試料を作
製し、加速環境での腐食試験を行って耐食性を調べた。
腐食試験の環境条件は、温度：７００℃、ガス：１００
％ＣＯ、圧力：５ｋｇｆ／ｃｍ2Ｇ、ガス流速：０．３
５Ｌ／分であり、８００時間経過後の腐食減量を測定し
た。各試験片試料の内、耐腐食性が劣る合金は浸炭腐
食、さらに生じるメタルダスティングコロージョンによ
って、材料の減肉により重量が減少した。また、各イン
ゴットから鍛造試験用の試料を作製し、加工性の評価を
行った。加工性は１００ｍｍφ×３００ｍｍＬの鋳塊を
１０００〜１３００℃で厚さ１０ｍｍまで熱間鍛造する
際の割れの発生状況から評価した。評価は、割れ発生な
し（○）、割れ深さ１ｍｍ以内（△）および割れ深さ１
ｍｍ以上（×）の３段階で評価した。腐食試験及び鍛造
試験の結果を、表１に併せ示す。[Example] Twenty-four alloys having the chemical compositions shown in Table 1 were melted in a high-frequency melting furnace, and each ingot obtained was forged, cold-rolled, and subjected to solution heat treatment to prepare a specimen sample. Then, the corrosion resistance was examined by performing a corrosion test in an accelerated environment.
The environmental conditions for the corrosion test are: temperature: 700 ° C, gas: 100
% CO, pressure: 5 kgf / cm 2 G, gas flow rate: 0.3
It was 5 L / min, and the corrosion weight loss after 800 hours was measured. Among the test piece samples, the alloy with poor corrosion resistance was carburized and the weight was reduced due to metal thinning corrosion caused by metal dusting corrosion. Further, a sample for forging test was prepared from each ingot and the workability was evaluated. The workability was evaluated from the occurrence of cracks when hot forging a 100 mmφ × 300 mmL ingot at 1000 to 1300 ° C. to a thickness of 10 mm. The evaluation was that no crack occurred (○), crack depth within 1 mm (△), and crack depth 1
The evaluation was made in 3 grades of mm or more (x). Table 1 also shows the results of the corrosion test and the forging test.
【００２１】[0021]
【表１】 [Table 1]
【００２２】表１の試料Ｎｏ.１は従来材のインコロイ
８００相当材である。試料Ｎｏ．２〜１２はＣｒを３０
％含有し、Ｎｏ．２〜６はＳｉ量を変化させたもの、Ｎ
ｏ．７〜１０はＡｌ量を変化させたもの、Ｎｏ．１１と
Ｎｏ．１２はＡｌとＹをともに含有させたものである。
Ｎｏ．１３〜２１はＣｒを２５％含有し、Ｎｏ．１３〜
１６はＳｉ量を変化させたもの、Ｎｏ．１７〜１９はＡ
ｌ量を変化させたもの、Ｎｏ．２０とＮｏ．２１はＡｌ
とＹをともに含有させたものである。Sample No. 1 in Table 1 is a conventional material equivalent to Incoloy 800. Sample No. 2 to 12 contains 30 Cr
%, No. 2 to 6 are those in which the amount of Si is changed, N
o. Nos. 7 to 10 are obtained by changing the amount of Al. 11 and No. No. 12 contains both Al and Y.
No. Nos. 13 to 21 contained 25% of Cr, and No. 13-
No. 16 is the one in which the amount of Si is changed. 17-19 is A
No. 1 in which the amount was changed. 20 and No. 21 is Al
And Y are contained together.
【００２３】表１に示す試験結果からわかるように、試
料Ｎｏ．１の従来材のインコロイ８００は加工性は良好
であるが、Ｆｅ含有量が多く、かつＮｉ＋２Ｃｒ含有量
が１００％より少ないために、耐食性が悪く腐食減肉量
が多い。試料Ｎｏ．２〜６およびＮｏ．１３〜１６の結
果から、Ｓｉ量が多くなるにつれて耐食性は向上する
が、腐食減肉量を３０ｍｇ／ｃｍ2以下のレベルまで耐
食性を改善するためには多量のＳｉの含有が必要とな
る。高Ｃｒ高Ｓｉとなる結果加工性が低下し、鍛造時の
割れが生じることがわかる。As can be seen from the test results shown in Table 1, the sample No. Incoloy 800, which is the conventional material of No. 1, has good workability, but since it has a large Fe content and a Ni + 2Cr content of less than 100%, it has poor corrosion resistance and a large amount of corrosion thinning. Sample No. 2 to 6 and No. From the results of Nos. 13 to 16, although the corrosion resistance is improved as the Si content is increased, it is necessary to contain a large amount of Si in order to improve the corrosion resistance to the level of the corrosion thinning amount of 30 mg / cm 2 or less. It can be seen that workability is lowered as a result of high Cr and high Si, and cracks occur during forging.
【００２４】試料Ｎｏ．７〜１０およびＮｏ．１７〜１
９の結果から、Ｓｉ量を１．５％程度に低減させてもＡ
ｌを含有させることにより耐食性を高めることができる
ことがわかる。しかも、Ａｌの含有量が２．５％以下の
含有範囲であれば、加工性を劣化させない。しかし、Ａ
ｌ量が過剰になると加工性が低下する（Ｎｏ．８，１
０，１８，１９）。Ｃｒを３０％含有する試料Ｎｏ．
８、１１、１２の比較から、Ｙの含有により耐食性が向
上すること、ＡｌとＹの複合含有でより一層耐食性が向
上することがわかる。このことは、Ｃｒを２５％含有す
る試料Ｎｏ．１７、２０、２１の比較からも同様な効果
が確認できる。Sample No. 7-10 and No. 17-1
From the results of 9, even if the amount of Si is reduced to about 1.5%, A
It can be seen that the corrosion resistance can be increased by adding 1. Moreover, if the content of Al is 2.5% or less, the workability is not deteriorated. However, A
If the amount of 1 is excessive, the workability is lowered (No. 8, 1).
0, 18, 19). Sample No. containing 30% Cr.
From the comparison of Nos. 8, 11, and 12, it can be seen that the corrosion resistance is improved by containing Y, and the corrosion resistance is further improved by the combined inclusion of Al and Y. This means that the sample No. containing 25% Cr. Similar effects can be confirmed by comparing 17, 20, and 21.
【００２５】以上の実験データは、Ｃｒを２５％または
３０％含有する合金において、Ｓｉ含有量を１．０〜
５．０％の範囲とし、かつＡｌを０．５〜２．５％の範
囲で含有せしめることにより、耐食性と加工性の両者を
兼備できること、さらに、Ｙを０．４％以下の範囲で含
有することが、耐食性向上のために有効であることを示
唆している。特に、Ｃｒが約３０％、Ｎｉが約５７％で
Ｎｉ＋２Ｃｒ≧１１０％の高クロム−高ニッケル系で、
約１％のＡｌ、約１．５％のＳｉ、約０．０５％のＹを
含有する試料Ｎｏ．１１の合金は優れた耐食性と良好な
加工性を兼備している最も優れた合金である。以上、本
発明の実施例について説明をしたが、本発明は上述の実
施の形態や実施例に限定されるものではなく、本発明の
要旨を逸脱しない範囲において種々の変形及び変更がで
きる。The above experimental data shows that in an alloy containing 25% or 30% Cr, the Si content is 1.0 to
By having the Al content in the range of 5.0% to 0.5% to 2.5%, both corrosion resistance and workability can be achieved, and Y is contained in the range of 0.4% or less. It is suggested that this is effective for improving the corrosion resistance. In particular, a high chromium-high nickel system in which Cr is about 30%, Ni is about 57% and Ni + 2Cr ≧ 110%,
Sample No. 1 containing about 1% Al, about 1.5% Si, about 0.05% Y. The 11th alloy is the best alloy having both excellent corrosion resistance and good workability. Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and examples, and various modifications and changes can be made without departing from the gist of the present invention.
【００２６】[0026]
【発明の効果】以上説明したように、本発明の耐熱合金
は５００℃以上のガス雰囲気下において生じる浸炭腐食
や、浸炭腐食がさらに進行したメタルダスティングコロ
ージョンに対する耐食性に優れ、長時間の使用に際して
も減肉しない優れた性能と、鍛造などの加工性に優れた
性能を兼備している。現在、浸炭腐食が問題となってい
る機器、例えば化学プラント改質炉周辺機器または固体
電解質型燃料電池（ＳＯＦＣ）の周辺部材などにおい
て、腐食寿命が向上し、材料コスト、メンテナンス等の
負担が軽減する。また、部分酸化（ＰＯＸ）改質炉等に
おいて、腐食を考慮しない機器設計が可能となり、装置
の耐久性等の特性向上が可能になる。As described above, the heat-resistant alloy of the present invention has excellent corrosion resistance against carburizing corrosion that occurs in a gas atmosphere of 500 ° C. or higher and metal dusting corrosion that has undergone further carburizing corrosion, and is suitable for long-term use. It has both excellent performance that does not reduce the wall thickness and excellent workability such as forging. At present, in equipment where carburizing corrosion is a problem, such as peripheral equipment of chemical plant reforming furnaces or peripheral materials of solid oxide fuel cells (SOFC), the corrosion life is improved and the burden of material cost and maintenance is reduced. To do. Further, in a partial oxidation (POX) reforming furnace or the like, it becomes possible to design a device without considering corrosion, and it is possible to improve the characteristics such as durability of the device.
Claims (3)
ｉ３０．０〜６０．０％（ただし、Ｎｉ＋２Ｃｒ＞１０
０％）、Ｓｉ１．０〜５．０％、Ｍｎ０．５％以下、Ａ
ｌ０．５〜２．５％、Ｙ０．４％以下、Ｃ０．０２〜
０．１％を含有し、残部Ｆｅおよび不可避不純物からな
ることを特徴とする高クロム−高ニッケル系耐熱合金。1. Cr 20.0 to 33.0% by weight, N
i30.0 to 60.0% (however, Ni + 2Cr> 10
0%), Si 1.0 to 5.0%, Mn 0.5% or less, A
0.5 to 2.5%, Y 0.4% or less, C 0.02
A high chromium-high nickel heat resistant alloy containing 0.1% and the balance being Fe and unavoidable impurities.
２Ｃｒ≧１１０％であることを特徴とする請求項１記載
の高クロム−高ニッケル系耐熱合金。2. The (Ni + 2Cr) is Ni + in% by weight.
The high chromium-high nickel heat resistant alloy according to claim 1, wherein 2Cr ≧ 110%.
ｉ１．０〜２．５％、Ａｌ０．８〜２．０％、Ｙ０．０
１〜０．１％であることを特徴とする請求項１または請
求項２記載の高クロム−高ニッケル系耐熱合金。3. Si, Al and Y in wt%, S
i1.0-2.5%, Al0.8-2.0%, Y0.0
The high chromium-high nickel system heat-resistant alloy according to claim 1 or 2, wherein the content is 1 to 0.1%.
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| JP2002024500A JP4256614B2 (en) | 2002-01-31 | 2002-01-31 | High chromium-high nickel heat resistant alloy |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006075841A (en) * | 2004-09-07 | 2006-03-23 | Sumitomo Metal Ind Ltd | Welded joint and welding material |
| JP2011252199A (en) * | 2010-06-02 | 2011-12-15 | Daido Steel Co Ltd | Ni-BASED ALLOY |
| US9249482B2 (en) | 2008-10-13 | 2016-02-02 | Schmidt + Clemens Gmbh + Co. Kg | Nickel-chromium-alloy |
-
2002
- 2002-01-31 JP JP2002024500A patent/JP4256614B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006075841A (en) * | 2004-09-07 | 2006-03-23 | Sumitomo Metal Ind Ltd | Welded joint and welding material |
| JP4513466B2 (en) * | 2004-09-07 | 2010-07-28 | 住友金属工業株式会社 | Welded joints and welding materials |
| US9249482B2 (en) | 2008-10-13 | 2016-02-02 | Schmidt + Clemens Gmbh + Co. Kg | Nickel-chromium-alloy |
| US10053756B2 (en) | 2008-10-13 | 2018-08-21 | Schmidt + Clemens Gmbh + Co. Kg | Nickel chromium alloy |
| JP2011252199A (en) * | 2010-06-02 | 2011-12-15 | Daido Steel Co Ltd | Ni-BASED ALLOY |
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| Publication number | Publication date |
|---|---|
| JP4256614B2 (en) | 2009-04-22 |
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