JPH08120413A - Casting member of two-phase stainless steel and its production - Google Patents
Casting member of two-phase stainless steel and its productionInfo
- Publication number
- JPH08120413A JPH08120413A JP6285853A JP28585394A JPH08120413A JP H08120413 A JPH08120413 A JP H08120413A JP 6285853 A JP6285853 A JP 6285853A JP 28585394 A JP28585394 A JP 28585394A JP H08120413 A JPH08120413 A JP H08120413A
- Authority
- JP
- Japan
- Prior art keywords
- present
- stainless steel
- austenite
- ferrite
- phase
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋳造品として優れた強
度と耐食性を兼ね備える２相ステンレス鋳造部材および
その製造方法を提供することである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to provide a two-phase stainless cast member having excellent strength and corrosion resistance as a cast product, and a method for producing the same.
【０００２】[0002]
【従来の技術】２相ステンレス鋼としては、ＳＵＳ３２
９Ｊ１に代表されるオーステナイトとフェライト組織を
有する鋼が知られている。この２相ステンレスは、高強
度と高靭性を有するとともに、耐食性にも優れているた
め、耐環境性と強度が要求される大型の化学装置の部材
として使用されている。上述したオーステナイト−フェ
ライト系２相ステンレスを鋳造品として使用する技術と
しては、特開昭５４−１２１２２３号に記載されるよう
に、銅を０．４−１．０％添加して鋳造品の強度を確保
すること、鋳造性および靭性を確保するために窒素を
０．１％以下に制限することが知られている。2. Description of the Related Art SUS32 is a duplex stainless steel.
A steel having an austenite and a ferrite structure represented by 9J1 is known. Since this duplex stainless steel has high strength and high toughness as well as excellent corrosion resistance, it is used as a member of a large-scale chemical device that requires environmental resistance and strength. As a technique for using the above-mentioned austenite-ferrite type duplex stainless steel as a cast product, as described in JP-A-54-112223, 0.4-1.0% of copper is added to improve the strength of the cast product. It is known that nitrogen is limited to 0.1% or less in order to secure the castability and toughness.
【０００３】[0003]
【発明が解決しようとする課題】上述したようにオース
テナイト−フェライト系２相ステンレス鋼は、高強度と
高靭性が得られるという特徴がある。この２相ステンレ
ス鋼を鋳造品とした場合は、鋳造後の熱間加工を行わな
いため組織が粗く、熱間加工品に比べて靭性および強度
が低いという欠点がある。また特開昭５４−１２１２２
３号に記載されるようにＣｕの添加は有効である。As described above, the austenitic-ferritic duplex stainless steel is characterized by high strength and high toughness. When this duplex stainless steel is used as a cast product, there is a drawback that the structure is rough because hot working after casting is not performed and the toughness and strength are lower than those of the hot worked product. Also, JP-A-54-12122
As described in No. 3, addition of Cu is effective.
【０００４】一方最近の技術として、機械加工をほとん
ど必要とせず複雑な３次元形状品を得る手法として精密
鋳造法が発展してきている。精密鋳造法というのは、ワ
ックス等で製造された製品模型に耐火物を被覆し、加熱
等により製品模型を消失させ、次いで耐火物を焼成した
鋳型に得られたキャビティ内に溶鋼を注湯することによ
り、最終形状品に近似した鋳造品を得るというものであ
る。精密鋳造法においては、複雑な製品形状に対応する
ため、注湯時には、１０００℃程度に加熱した状態で注
湯される。On the other hand, as a recent technique, a precision casting method has been developed as a method for obtaining a complicated three-dimensionally shaped product with almost no need for machining. The precision casting method is to coat the product model made of wax etc. with refractory, extinguish the product model by heating etc., and then pour molten steel into the cavity obtained in the mold fired refractory By doing so, a cast product similar to the final shape product is obtained. In the precision casting method, since it corresponds to a complicated product shape, the molten metal is poured in a state of being heated to about 1000 ° C. at the time of pouring.
【０００５】本発明者は、強度を要求される部材に適用
するために上述の特開昭５４−１２１２２３号記載のオ
ーステナイト−フェライト系２相ステンレス鋼を検討し
たところ、強度および靭性が低く、鋳造ままでは上記用
途に使用できないものであった。本発明の目的は、上記
問題に鑑み鋳造品として優れた靭性および強度を確保し
つつ、耐食性および耐応力腐食割れ性に優れたオーステ
ナイト−フェライト２相ステンレス鋳造部品およびその
製造方法を提供することである。The present inventor studied the austenite-ferrite type duplex stainless steel described in JP-A No. 54-112223 in order to apply it to members requiring high strength. As it is, it cannot be used for the above purpose. In view of the above problems, an object of the present invention is to provide an austenite-ferrite duplex stainless steel cast component excellent in corrosion resistance and stress corrosion cracking resistance while ensuring excellent toughness and strength as a cast product, and a method for producing the same. is there.
【０００６】[0006]
【課題を解決するための手段】本発明者は、２相ステン
レス鋼に対して精密鋳造法を適用することを検討し、合
金成分と鋳造性ならびに機械的性質の関係を検討した。
そして、本発明者は十分な機械的特性を維持しながら、
耐食性および耐応力腐食割れ性を高めるためにはＣｕと
窒素の量を共に高め、炭素の量を低めた組成とすること
が有効であること、さらに窒素を高めたことにより不純
物として鋼内に存在するＡｌが鋳造品の機械特性を著し
く劣化することから、不純物として存在するＡｌを制限
すべきでであることを見い出し、本発明に到達した。Means for Solving the Problems The present inventor has studied the application of a precision casting method to duplex stainless steel, and investigated the relationship between alloy components and castability and mechanical properties.
And, while maintaining sufficient mechanical properties, the present inventor
In order to improve the corrosion resistance and the stress corrosion cracking resistance, it is effective to increase the amount of both Cu and nitrogen and to reduce the amount of carbon. It is also present in steel as an impurity by increasing nitrogen. Therefore, the present invention has been accomplished by finding out that Al present as impurities should be limited because Al that significantly deteriorates the mechanical properties of the cast product.
【０００７】すなわち、本発明は、重量％で、Ｃ≦０．
０８、Ｓｉ≦０．９、Ｍｎ≦０．９、Ｎｉ５．０−８．
０、Ｃｒ２４．０−３０．０、Ｍｏ１．０−２．５、Ｃ
ｕ２．６−３．５、Ｎ０．１５−０．２５、残部実質的
にＦｅであり、不純物として含有するＡｌが０．０５以
下に制限され、かつ組織がオーステナイトとフェライト
の２相構造を有することを特徴とする２相ステンレス鋳
造部材である。That is, according to the present invention, C.
08, Si ≦ 0.9, Mn ≦ 0.9, Ni5.0-8.
0, Cr24.0-30.0, Mo1.0-2.5, C
u2.6-3.5, N0.15-0.25, balance is substantially Fe, Al contained as impurities is limited to 0.05 or less, and the structure has a two-phase structure of austenite and ferrite. It is a two-phase stainless cast member characterized by the above.
【０００８】本発明において好ましくは重量％で、Ｃ
０．０１−０．０５、Ｓｉ０．５−０．９、Ｍｎ０．４
−０．９、Ｎｉ５．０−６．０、Ｃｒ２５．５−２７．
５、Ｍｏ１．５−２．０、Ｃｕ２．６−２．９、Ｎ０．
１５−０．２０、残部実質的にＦｅであり、不純物とし
て含有するＡｌを０．０３以下の組成とする。また本発
明において重量％でＢを０．００５％以下含有していて
も良い。In the present invention, preferably in% by weight, C
0.01-0.05, Si0.5-0.9, Mn0.4
-0.9, Ni5.0-6.0, Cr25.5-27.
5, Mo1.5-2.0, Cu2.6-2.9, N0.
The composition is 15 to 0.20, the balance is substantially Fe, and the composition of Al contained as impurities is 0.03 or less. Further, in the present invention, B may be contained in an amount of 0.005% or less by weight.
【０００９】また、上記本発明の鋳造部材を得る本発明
の製造方法は上記組成の合金溶湯を加熱した精密鋳造鋳
型に注湯し、オーステナイトとフェライトの２相構造を
有する鋳造部材を得ることを特徴とする２相ステンレス
鋳造部材の製造方法である。Further, in the production method of the present invention for obtaining the cast member of the present invention, the molten alloy having the above composition is poured into a heated precision casting mold to obtain a cast member having a two-phase structure of austenite and ferrite. A method for producing a characteristic two-phase stainless cast member.
【００１０】[0010]
【作用】本発明の重要な特徴は、特定組成の２相ステン
レス鋼において、耐食性を高めるとともに耐応力腐食割
れ性を高めることを目的として、Ｃｕと窒素の量を共に
高めるとともに、炭素含有量を低めた組成とし、さらに
不純物として鋼内に存在するＡｌを制限したことにあ
る。以下に本発明で規定する組成範囲について詳しく説
明する。 Ｃｕ２．６−３．５％ 本発明において、Ｃｕは鋳造品の強度を析出強化により
確保するとともに、りん酸や硫酸に対する耐食性を改善
する本発明で最も重要な元素の一つである。鋳造品とし
て優れた機械強度を確保するには２．６％以上必要であ
り、３．５％を超えるとＣｕとして析出し、靭性が低下
し、鋳造後の割れ欠陥につながり好ましくない。鋳造品
は、熱間加工等により組織を微細化するものではないた
め、優れた機械強度と靭性の両立のために狭い組成範囲
に限定されるものである。An important feature of the present invention is that in a duplex stainless steel having a specific composition, the amounts of Cu and nitrogen are both increased and the carbon content is increased in order to improve the corrosion resistance and the stress corrosion cracking resistance. This is because the composition was made lower and Al existing in the steel as impurities was limited. The composition range specified in the present invention will be described in detail below. Cu 2.6-3.5% In the present invention, Cu is one of the most important elements in the present invention, which secures the strength of the cast product by precipitation strengthening and improves the corrosion resistance to phosphoric acid and sulfuric acid. 2.6% or more is required to secure excellent mechanical strength as a cast product, and if it exceeds 3.5%, it precipitates as Cu and the toughness decreases, leading to crack defects after casting, which is not preferable. Since the cast product does not have a fine structure due to hot working or the like, it is limited to a narrow composition range in order to achieve both excellent mechanical strength and toughness.
【００１１】Ｎ０．１５−０．２５％ 窒素はオーステナイトを安定化するとともに、耐応力腐
食割れ性を著しく高める重要な元素である。窒素は鋳造
性を阻害する元素であり多量に含有すると鋳造における
湯流れ性の劣化とともに、ガスホール欠陥が発生する場
合がある。より好ましくは、０．１５−０．２０％であ
る。 Ｃ≦０．０８％ 強力なオーステナイト化元素であり、耐食性の向上およ
び鋳造性の改善に効果がある。しかし、本発明において
耐応力腐食割れ性を改善するためには、オーステナイト
化元素である窒素を多量に導入する必要があり、２相ス
テンレスとして安定な組織を得るためには、オーステナ
イト化元素のバランスからその量を制限する必要があ
る。また多量に添加するとＣｒの炭化物を析出して耐粒
界腐食性を劣化する問題もある。好ましくは０．０１−
０．０８％であり、さらに好ましくは、 ０．０１−
０．０５％である。N0.15-0.25% Nitrogen is an important element which stabilizes austenite and remarkably enhances stress corrosion cracking resistance. Nitrogen is an element that hinders castability, and if it is contained in a large amount, the flowability of molten metal in casting may deteriorate and a gas hole defect may occur. More preferably, it is 0.15-0.20%. C ≦ 0.08% A strong austenitizing element, which is effective in improving corrosion resistance and castability. However, in order to improve the stress corrosion cracking resistance in the present invention, it is necessary to introduce a large amount of nitrogen which is an austenitizing element, and in order to obtain a stable structure as a duplex stainless steel, the balance of the austenitizing elements is required. It is necessary to limit that amount. Further, if added in a large amount, there is also a problem that carbide of Cr is precipitated and the intergranular corrosion resistance is deteriorated. Preferably 0.01-
0.08%, and more preferably 0.01-
It is 0.05%.
【００１２】Ａｌ０．０５％以下 Ａｌは窒素を含有する本発明の鋳造品にとっては、窒化
アルミニウムとして結晶粒界に析出して靭性の著しい劣
化を招く元素であり、制限しなければならない元素であ
る。また耐食性を劣化する元素でもある。不純物として
のＡｌは、鋼の原料として微量混入するもの、あるいは
製造工程において脱酸元素として使用されたものが残留
している場合がある。より好ましくは、０．０３％以下
とする。Al 0.05% or less Al is an element which, in the cast product of the present invention containing nitrogen, is an element which is precipitated as aluminum nitride at the grain boundaries and causes a remarkable deterioration in toughness, and is an element which must be limited. . It is also an element that deteriorates corrosion resistance. In some cases, Al as an impurity remains that is mixed in as a raw material of steel in a trace amount or used as a deoxidizing element in the manufacturing process. More preferably, it is 0.03% or less.
【００１３】Ｃｒ２４−３０％ Ｃｒはフェライト化元素であり、ステンレス鋼の基本的
な耐食性を確保する元素である。本発明では鋳造品の機
械的強度を高めるためオーステナイト形成元素であるＣ
ｕおよびＮを多く含有させているため、十分なフェライ
ト量と耐食性を確保するために２４％以上必要である。
一方Ｃｒを高めていくとフェライトの単相組織に近づ
き、靭性が低下していく。またＣｒを高めると靭性の極
めて低いδ相の生成を助長することにもなる。したがっ
て、Ｃｒの上限は制限される。本発明では２相組織のバ
ランス上３０％以下に規定した。さらに望ましくは２
５．５−２７．５％の範囲とする。Cr 24-30% Cr is a ferritic element, which secures the basic corrosion resistance of stainless steel. In the present invention, C, which is an austenite-forming element, is used to enhance the mechanical strength of the cast product
Since it contains a large amount of u and N, 24% or more is necessary to secure a sufficient ferrite amount and corrosion resistance.
On the other hand, if the Cr content is increased, it approaches a single-phase structure of ferrite and the toughness decreases. Further, increasing Cr also promotes the formation of a δ phase having extremely low toughness. Therefore, the upper limit of Cr is limited. In the present invention, the balance of the two-phase structure is specified to be 30% or less. More preferably 2
The range is 5.5 to 27.5%.
【００１４】Ｓｉ≦０．９％ Ｓｉは、鋳造性および強度を確保する有効な元素であ
り、一方Ｓｉは多量に添加すると靭性を劣化する元素で
あるためＳｉ≦０．９％に規定した。好ましくは０．５
−０．９％である。 Ｍｎ≦０．９％ Ｍｎは強力なオーステナイト化元素であるとともに、鋳
造性を高めることのできる元素である。また多量に添加
すると靭性の低いδ相形成を助長するため０．９％以下
とした。好ましくは０．４−０．９の範囲とする。Si≤0.9% Si is an effective element for ensuring castability and strength, while Si is an element that deteriorates toughness when added in a large amount, so Si≤0.9% is specified. Preferably 0.5
-0.9%. Mn ≦ 0.9% Mn is a strong austenitizing element and is an element capable of enhancing castability. Further, if added in a large amount, it promotes the formation of a δ phase having low toughness, so the content was made 0.9% or less. The range is preferably 0.4-0.9.
【００１５】Ｎｉ５．０−８．０％ Ｎｉはオーステナイト化元素であり、また耐食性および
靭性を確保するのに有効な元素である。本発明において
は２相組織のバランス上５−８％と規定した。好ましく
は、５．０−６．０％、より好ましくは５．５−６．０
である。 Ｍｏ１．０−２．５％ Ｍｏは、ＣｒおよびＣｕと共存させることによって、耐
食性を大きく向上できる元素である。耐食性の改善効果
は１．０％未満では少なく、２．５％を超えると効果が
飽和するため１．０−２．５％に規定した。好ましくは
１．５−２．０％とする。Ni 5.0-8.0% Ni is an austenitizing element and is an element effective for ensuring corrosion resistance and toughness. In the present invention, it is defined as 5-8% in view of the balance of the two-phase structure. Preferably 5.0-6.0%, more preferably 5.5-6.0%.
Is. Mo 1.0-2.5% Mo is an element that can greatly improve the corrosion resistance by coexisting with Cr and Cu. The effect of improving the corrosion resistance is small at less than 1.0%, and the effect is saturated at more than 2.5%. Preferably it is 1.5-2.0%.
【００１６】また本発明においては、不純物としてＢを
０．００５％以下含んでいても良い。Ｂは、熱間加工性
を高める元素であって、本来鋳造部材である本発明の特
性を高める元素ではない点において必須元素でなく不純
物である。しかし、例えば大型の鋼塊から鋳造用のマス
ターインゴットとして取り分けようとすると、分割しや
すいように熱間加工性が必要な場合があり、この場合は
Ｂの存在が有効である。Ｂは多量に添加すると鋳造材と
しての機械的特性を劣化することになり、また多量の添
加は熱間加工性を逆に阻害するため制限しなければなら
ない。本発明においては、 ０．００５％以下に規制す
るものである。Further, in the present invention, B may be contained as an impurity in an amount of 0.005% or less. B is an element that enhances hot workability and is not an essential element but an impurity in that it is not an element that originally enhances the characteristics of the present invention, which is a cast member. However, for example, when trying to separate a large steel ingot as a master ingot for casting, there is a case where hot workability is required so that the master ingot can be easily divided. In this case, the presence of B is effective. When B is added in a large amount, the mechanical properties of the cast material are deteriorated, and addition of B in a large amount adversely affects hot workability, so it must be limited. In the present invention, the amount is regulated to 0.005% or less.
【００１７】また本発明の他の特徴は製造方法におい
て、加熱した精密鋳造鋳型に注湯することである。本発
明の合金組成には、鋳造性にとっては好ましくない窒
素、Ｃｕを多く添加するため、加熱した鋳型に注湯する
ことにより鋳造欠陥の発生を防止することができる。す
なわち本発明の方法を採用することにより、従来よりも
格段に耐食性、耐応力腐食割れ性の優れた精密鋳造品を
初めて得られるようになる。特に精密な製品形状を得る
ためには１０００℃以上に加熱した鋳型を用いるのが好
ましい。Another feature of the present invention is that in the manufacturing method, the molten metal is poured into a heated precision casting mold. Since the alloy composition of the present invention contains a large amount of nitrogen and Cu which are not preferable for castability, it is possible to prevent casting defects by pouring the molten metal into a heated mold. That is, by adopting the method of the present invention, it is possible to obtain for the first time a precision cast product having significantly better corrosion resistance and stress corrosion cracking resistance than before. In order to obtain a particularly precise product shape, it is preferable to use a mold heated to 1000 ° C. or higher.
【００１８】[0018]
【実施例】表１に示す組成の合金の試験片を精密鋳造法
により製造した。この時、鋳造に際して、まずφ１０×
１００L(mm)と３０×３０×１０t(mm)のワックス模型を
製造し、ツリー上に組み立てた後、セラミックス耐火物
で被覆し、脱ワックス後、焼成炉により１０００℃に加
熱し、鋳型とする。一方合金は、高周波誘導溶解炉によ
り合金溶湯を得ておき、加熱した状態の鋳型に注湯を行
った。得られた合金は、１０５０℃×１．５時間保持後
水冷する固溶化処理を行い、ついて４８０℃×４時間の
時効処理を行い試験片とした。EXAMPLE Test pieces of alloy having the composition shown in Table 1 were manufactured by a precision casting method. At this time, when casting, first φ10 ×
100L (mm) and 30 × 30 × 10t (mm) wax models are manufactured, assembled on a tree, coated with ceramic refractory, dewaxed, and heated to 1000 ° C in a firing furnace to form a mold. . On the other hand, for the alloy, an alloy melt was obtained in a high-frequency induction melting furnace and poured into a heated mold. The alloy thus obtained was subjected to a solution treatment of holding it at 1050 ° C. for 1.5 hours and then cooling it with water, and then aging treatment at 480 ° C. for 4 hours to obtain a test piece.
【００１９】得られた試験片を用いて、表２に示す機械
的特性と鋳造欠陥および耐食性の評価を行った。ここ
で、鋳造欠陥の評価は外観およびＸ線透過試験により、
φ１．０ｍｍ以上の鋳造欠陥が無いものを○、３箇所以
上発生したものを×として評価した。また、耐食性は、
ＪＩＳ Ｚ２３７１に規定される塩水噴霧試験を２００
時間行うこと、およびＪＩＳ Ｇ０５９１に基づく沸騰
５％硫酸中に６時間浸漬してその全面腐食減量で評価し
た。なお、塩水噴霧試験では発錆が全く見られないもの
を○、一部発錆したものを△、全面発錆したものを×と
して評価した。また耐応力腐食割れ性を評価するため、
ＪＩＳ Ｇ０５７６に示される４２％ＭｇＣｌ2溶液中
での引張試験を行い試験片が破断するまでの時間を求め
た。この時の引張荷重は１０ｋｇｆ／ｍｍ2とした。The test pieces thus obtained were used to evaluate the mechanical properties, casting defects and corrosion resistance shown in Table 2. Here, the evaluation of the casting defect is based on the appearance and the X-ray transmission test.
The case where there is no casting defect of φ1.0 mm or more was evaluated as ◯, and the case where three or more locations were generated was evaluated as x. Corrosion resistance is
200 salt spray test specified in JIS Z2371
Evaluation was carried out for a period of time, and immersion in boiling 5% sulfuric acid based on JIS G0591 for 6 hours was performed and the overall corrosion weight loss was evaluated. In the salt spray test, rust was not observed at all, ◯ was partially rusted, and rust was evaluated on all surfaces. To evaluate stress corrosion cracking resistance,
A tensile test in a 42% MgCl2 solution shown in JIS G0576 was performed to determine the time until the test piece broke. The tensile load at this time was 10 kgf / mm 2 .
【００２０】[0020]
【表１】 [Table 1]
【００２１】[0021]
【表２】 [Table 2]
【００２２】表２において、本発明試験片はＪＩＳ Ｓ
ＵＳ３２９Ｊ１に対応する試料Ｎｏ．１０よりも、耐力
が約３０％高い５５kgf/ｍｍ2以上、伸びにおいても約
２０％高い値であった。また本発明のうち、Ｃｕ量が本
発明の規定範囲の下限に近い試料３は、硫酸に対する腐
食減量が増加し、機械強度が低下する傾向にあることが
わかる。本発明のうち、Ａｌの高い試料Ｎｏ．４のもの
は機械的特性がやや低下し、本発明の範囲を超えてＡｌ
の高い試料Ｎｏ．１１では本発明の典型的な組成である
試料Ｎｏ．１に比べて伸びが１／６、靭性を示すシャル
ピー衝撃値が１／８と著しく機械的特性が劣化すること
がわかる。In Table 2, the test pieces of the present invention are JIS S.
Sample No. corresponding to US329J1. The yield strength was 55 kgf / mm 2 or more, which was about 30% higher than 10, and the elongation was also about 20% higher. Further, among the present invention, it can be seen that Sample 3, in which the amount of Cu is close to the lower limit of the specified range of the present invention, tends to increase the corrosion weight loss against sulfuric acid and decrease the mechanical strength. Of the present invention, the sample No. No. 4, the mechanical properties of which are slightly deteriorated, and Al exceeds the range of the present invention.
High sample No. In No. 11, sample No. 11 having a typical composition of the present invention. It can be seen that the mechanical properties are remarkably deteriorated with elongation being 1/6 and Charpy impact value showing toughness being 1/8 as compared with 1.
【００２３】本発明のうち、窒素の低い試料Ｎｏ．５で
は機械強度がやや低下し、腐食減量がやや増加し、応力
腐食破断時間が短くなる傾向が見られる。本発明の範囲
よりもさらに窒素の低い試料Ｎｏ．１２では、本発明の
典型的な組成である試料Ｎｏ．１に比べて、機械強度が
約３０％低下し、また腐食減量が約３．５倍、応力腐食
破断時間が１／２以下となり好ましくない結果となっ
た。Among the present invention, sample No. 1 having a low nitrogen content was used. In No. 5, the mechanical strength is slightly lowered, the corrosion weight loss is slightly increased, and the stress corrosion rupture time tends to be shortened. Sample No. with a nitrogen content lower than the range of the present invention. In No. 12, sample No. 12 having a typical composition of the present invention. Compared with No. 1, the mechanical strength was reduced by about 30%, the corrosion weight loss was about 3.5 times, and the stress corrosion rupture time was 1/2 or less, which is an unfavorable result.
【００２４】[0024]
【発明の効果】本発明によれば、機械強度に優れ、しか
も極めて優れた耐食性および耐応力腐食割れ性を示す鋳
造部材を提供できる。したがって、現在の亜硫酸ガス等
の腐食性ガスが存在する都会の厳しい環境下において、
極めて有効である。According to the present invention, it is possible to provide a cast member which is excellent in mechanical strength and has extremely excellent corrosion resistance and stress corrosion cracking resistance. Therefore, under the severe urban environment where corrosive gas such as sulfurous acid gas is present,
It is extremely effective.
Claims (5)
９、Ｍｎ≦０．９、Ｎｉ５．０−８．０、Ｃｒ２４．０
−３０．０、Ｍｏ１．０−２．５、Ｃｕ２．６−３．
５、Ｎ０．１５−０．２５、残部実質的にＦｅであり、
不純物として含有するＡｌが０．０５以下に制限され、
かつ組織がオーステナイトとフェライトの２相構造を有
することを特徴とする２相ステンレス鋳造部材。1. In weight%, C ≦ 0.08, Si ≦ 0.
9, Mn ≦ 0.9, Ni5.0-8.0, Cr24.0
-30.0, Mo1.0-2.5, Cu2.6-3.
5, N0.15-0.25, the balance is substantially Fe,
Al contained as impurities is limited to 0.05 or less,
Further, a two-phase stainless cast member characterized in that its structure has a two-phase structure of austenite and ferrite.
０．５−０．９、Ｍｎ０．４−０．９、Ｎｉ５．０−
６．０、Ｃｒ２５．５−２７．５、Ｍｏ１．５−２．
０、Ｃｕ２．６−２．９、Ｎ０．１５−０．２０、残部
実質的にＦｅであり、不純物として含有するＡｌが０．
０３以下に制限され、かつ組織がオーステナイトとフェ
ライトの２相構造を有することを特徴とする２相ステン
レス鋳造部材。2. C0.01-0.05, Si by weight%.
0.5-0.9, Mn0.4-0.9, Ni5.0-
6.0, Cr25.5-27.5, Mo1.5-2.
0, Cu 2.6-2.9, N 0.15-0.20, the balance being substantially Fe, and Al contained as an impurity being 0.
A two-phase stainless cast member characterized by being limited to 03 or less and having a two-phase structure of austenite and ferrite.
ことを特徴とする請求項１ないし２のいずれかに記載の
２相ステンレス鋳造部材。3. The duplex stainless cast member according to claim 1, wherein B is contained in an amount of 0.005% or less by weight.
９、Ｍｎ≦０．９、Ｎｉ５．０−８．０、Ｃｒ２４．０
−３０．０、Ｍｏ１．０−２．５、Ｃｕ２．６−３．
５、Ｎ０．１５−０．２５、残部実質的にＦｅであり、
不純物として含有するＡｌが０．０５以下に制限された
組成を有する合金溶湯を、加熱した精密鋳造鋳型に注湯
し、オーステナイトとフェライトの２相構造を有する鋳
造部材を得ることを特徴とする２相ステンレス鋳造部材
の製造方法。4. In weight%, C ≦ 0.08, Si ≦ 0.
9, Mn ≦ 0.9, Ni5.0-8.0, Cr24.0
-30.0, Mo1.0-2.5, Cu2.6-3.
5, N0.15-0.25, the balance is substantially Fe,
A molten alloy having a composition in which Al contained as impurities is limited to 0.05 or less is poured into a heated precision casting mold to obtain a cast member having a two-phase structure of austenite and ferrite. Phase stainless steel casting member manufacturing method.
ことを特徴とする請求項４に記載の２相ステンレス鋳造
部材の製造方法。5. The method for producing a two-phase stainless cast member according to claim 4, wherein B is contained in an amount of 0.005% or less by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28585394A JP3155431B2 (en) | 1994-10-26 | 1994-10-26 | Duplex stainless cast member and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28585394A JP3155431B2 (en) | 1994-10-26 | 1994-10-26 | Duplex stainless cast member and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08120413A true JPH08120413A (en) | 1996-05-14 |
| JP3155431B2 JP3155431B2 (en) | 2001-04-09 |
Family
ID=17696910
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28585394A Expired - Fee Related JP3155431B2 (en) | 1994-10-26 | 1994-10-26 | Duplex stainless cast member and method of manufacturing the same |
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| Country | Link |
|---|---|
| JP (1) | JP3155431B2 (en) |
Cited By (8)
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|---|---|---|---|---|
| JPWO2005103314A1 (en) * | 2004-04-19 | 2008-03-13 | 日立金属株式会社 | High Cr high Ni austenitic heat-resistant cast steel and exhaust system parts comprising the same |
| CN102482746A (en) * | 2009-09-10 | 2012-05-30 | 住友金属工业株式会社 | Two-phase stainless steel |
| WO2012111536A1 (en) * | 2011-02-14 | 2012-08-23 | 住友金属工業株式会社 | Duplex stainless steel, and process for production thereof |
| WO2012111537A1 (en) * | 2011-02-14 | 2012-08-23 | 住友金属工業株式会社 | Duplex stainless steel |
| CN103370166A (en) * | 2011-02-14 | 2013-10-23 | 新日铁住金株式会社 | Welded duplex stainless joint |
| CN103781931A (en) * | 2011-09-06 | 2014-05-07 | 新日铁住金株式会社 | Two-phase stainless steel |
| CN104532141A (en) * | 2014-12-30 | 2015-04-22 | 浙江振兴石化机械有限公司 | Biphase stainless steel material and preparation method thereof, and application of biphase stainless steel material in submersible electric pump impellers and guide wheels |
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| US8241558B2 (en) | 2004-04-19 | 2012-08-14 | Hitachi Metals, Ltd. | High-Cr, high-Ni, heat-resistant, austenitic cast steel and exhaust equipment members formed thereby |
| CN102482746A (en) * | 2009-09-10 | 2012-05-30 | 住友金属工业株式会社 | Two-phase stainless steel |
| US20120177529A1 (en) * | 2009-09-10 | 2012-07-12 | Sumitomo Metal Industries, Ltd. | Duplex stainless steel |
| US20130315776A1 (en) * | 2011-02-14 | 2013-11-28 | Nippon Steel & Sumitomo Metal Corporation | Duplex stainless steel |
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| CN103370166A (en) * | 2011-02-14 | 2013-10-23 | 新日铁住金株式会社 | Welded duplex stainless joint |
| WO2012111536A1 (en) * | 2011-02-14 | 2012-08-23 | 住友金属工業株式会社 | Duplex stainless steel, and process for production thereof |
| EP2677056A1 (en) * | 2011-02-14 | 2013-12-25 | Nippon Steel & Sumitomo Metal Corporation | Duplex stainless steel |
| US9771628B2 (en) | 2011-02-14 | 2017-09-26 | Nippon Steel & Sumitomo Metal Corporation | Duplex stainless steel and production method therefor |
| EP2677056A4 (en) * | 2011-02-14 | 2015-03-25 | Nippon Steel & Sumitomo Metal Corp | Duplex stainless steel |
| US9579870B2 (en) | 2011-02-14 | 2017-02-28 | Nippon Steel & Sumitomo Metal Corporation | Welded joint of duplex stainless steel |
| AU2012218661B2 (en) * | 2011-02-14 | 2015-04-30 | Nippon Steel Corporation | Duplex stainless steel |
| WO2012111537A1 (en) * | 2011-02-14 | 2012-08-23 | 住友金属工業株式会社 | Duplex stainless steel |
| CN103370166B (en) * | 2011-02-14 | 2016-04-06 | 新日铁住金株式会社 | Duplex stainless steel welded joints |
| EP2676763A4 (en) * | 2011-02-14 | 2016-12-28 | Nippon Steel & Sumitomo Metal Corp | Welded duplex stainless joint |
| CN103781931A (en) * | 2011-09-06 | 2014-05-07 | 新日铁住金株式会社 | Two-phase stainless steel |
| CN104532141A (en) * | 2014-12-30 | 2015-04-22 | 浙江振兴石化机械有限公司 | Biphase stainless steel material and preparation method thereof, and application of biphase stainless steel material in submersible electric pump impellers and guide wheels |
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| JP2018059157A (en) * | 2016-10-06 | 2018-04-12 | 新日鐵住金株式会社 | Two-phase stainless steel |
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