JPH0813094A - Duplex stainless cast steel and production thereof - Google Patents
Duplex stainless cast steel and production thereofInfo
- Publication number
- JPH0813094A JPH0813094A JP16478994A JP16478994A JPH0813094A JP H0813094 A JPH0813094 A JP H0813094A JP 16478994 A JP16478994 A JP 16478994A JP 16478994 A JP16478994 A JP 16478994A JP H0813094 A JPH0813094 A JP H0813094A
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- cast steel
- duplex stainless
- stainless cast
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、遠心分離機の回転体な
どの高強度、高耐食性が必要とされる装置部材の材料な
どに用いて好適な二相ステンレス鋳鋼に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplex stainless cast steel suitable for use as a material for an apparatus member such as a rotating body of a centrifuge that requires high strength and high corrosion resistance.
【０００２】[0002]
【従来の技術】例えば、食品工業や汚水処理に用いられ
る遠心分離機は、装置の大型化、回転数の増大や腐食環
境の悪化によって、その材料の強度や耐食性に対する要
求がますます厳しくなってきている。現今では、強度と
しては、０．２％耐力が５５ｋｇｆ／ｍｍ2 以上、伸び
が２５％以上要求されている。また、耐食性について
も、より優れたものが求められている。2. Description of the Related Art For example, centrifuges used in the food industry and sewage treatment are becoming more and more demanding for the strength and corrosion resistance of their materials due to the large size of the equipment, the increase in the number of revolutions and the deterioration of the corrosive environment. ing. At present, 0.2% proof stress is required to be 55 kgf / mm 2 or more and elongation is required to be 25% or more. Further, more excellent corrosion resistance is required.
【０００３】従来、このような高強度、高耐食性材料と
して高Ｃｒ低Ｎｉ系の二相ステンレス鋳鋼が提案されて
いる（特開昭５２−１５３８２１号公報、特開昭６４−
３１９５３号公報）。Hitherto, as such a high-strength, high-corrosion resistant material, a high Cr low Ni type duplex stainless cast steel has been proposed (Japanese Patent Laid-Open Nos. 52-153821 and 64-641).
No. 31953).
【０００４】しかしながら、上記従来の二相ステンレス
鋳鋼は、強度において前記要求を満足するものはあるも
のの、耐食性が充分なものではない。即ち、本発明者に
よれば、上記従来の二相ステンレス鋳鋼は、耐隙間腐食
性が優れているものと提案されているにもかかわらず、
実際に遠心分離機の固定部材と係合する回転リングに用
いると、汚泥処理に延べ１０００時間運転した時点で該
回転リングの１個所以上にスケールの発生が観察された
鋼種がかなりあった（以下、これを遠心分離試験とい
う）。However, although some of the conventional duplex stainless cast steels described above satisfy the above requirements in strength, they do not have sufficient corrosion resistance. That is, according to the present inventor, the above-mentioned conventional duplex stainless steel cast steel is proposed to have excellent crevice corrosion resistance,
When actually used for a rotating ring that engages with a fixed member of a centrifuge, there were quite a few steel grades in which scale generation was observed at one or more places of the rotating ring after 1000 hours of operation for sludge treatment. , This is called the centrifugation test).
【０００５】[0005]
【発明が解決しようとする課題】本発明の目的は、上記
事情に鑑み、０．２％耐力が５５ｋｇｆ／ｍｍ2 以上、
伸びが２５％以上で、遠心分離機の回転リングに延べ１
０００時間使用してもスケールの発生が全く観察されな
い二相ステンレス鋳鋼を提供することにある。In view of the above circumstances, the object of the present invention is to provide a 0.2% proof stress of 55 kgf / mm 2 or more,
Elongation is 25% or more, and it can be used for centrifuge rotating ring 1
It is to provide a duplex stainless cast steel in which no scale generation is observed even after 000 hours of use.
【０００６】[0006]
【課題を解決するための手段】本発明者は、上記目的を
達成すべく、まず、耐隙間腐食性を評価する方法とし
て、従来の、塩素イオン含有水溶液中での分極曲線から
孔食電位を測定する方法に代わる、遠心分離試験の結果
と強い相関を示す方法について、鋭意研究した。その結
果、試料にシリコンラバーを用いて隙間を設けたものを
使用しＪＩＳ Ｇ０５７７の孔食電位測定法によって測
定した二相ステンレス鋳鋼の孔食電位が遠心分離試験の
結果と強い相関を示すことおよびその孔食電位が８００
ｍＶ以上であれば、優れた耐隙間腐食性を示すことの知
見を得た。 そこで、次に、ＪＩＳＧ ０５７７による
孔食電位に及ぼす種々元素の影響について、詳細に検討
した。その結果、特にＣｏとＷの添加量を限定すること
によって上記目的を達成し得ることを見出した。In order to achieve the above object, the present inventor first determines a pitting corrosion potential from a conventional polarization curve in a chloride ion-containing aqueous solution as a method for evaluating crevice corrosion resistance. As a substitute for the measuring method, a method showing a strong correlation with the result of the centrifugation test was earnestly studied. As a result, the pitting corrosion potential of the duplex stainless cast steel measured by the pitting potential measuring method of JIS G0577 using a sample provided with a gap using silicon rubber shows a strong correlation with the result of the centrifugal separation test, and Its pitting potential is 800
It has been found that if it is mV or more, it exhibits excellent crevice corrosion resistance. Therefore, next, the effects of various elements on the pitting potential according to JIS G 0577 were examined in detail. As a result, they have found that the above objects can be achieved by limiting the addition amounts of Co and W in particular.
【０００７】即ち、本発明の二相ステンレス鋳鋼の第１
のものは、Ｃｒ：２０〜３５重量％、Ｎｉ：３〜１２重
量％、Ｍｏ：０．５〜６重量％、Ｃｏ：０．０１〜０．
２７重量％、Ｃｕ：０．１〜３重量％、Ｎ：０．０５〜
３重量％、Ｗ：１〜３重量％、Ｃ：０．１２重量％以
下、Ｓｉ：３重量％以下、Ｍｎ：５重量％以下を含み、
残部が鉄および不可避不純物からなり、第２のものは、
上記第１のもののうちより好ましいもので、Ｃｒ：２５
〜２７重量％、Ｎｉ：５．５〜７重量％、Ｍｏ：３〜
４．５重量％、Ｃｏ：０．０１〜０．２７重量％、Ｃ
ｕ：０．５〜１．５重量％、Ｎ：０．１５〜０．３重量
％、Ｗ：１〜１．５重量％、Ｃ：０．０５重量％以下、
Ｓｉ：１重量％以下、Ｍｎ：１重量％以下を含み、残部
が鉄および不可避不純物からなる。また、本発明の二相
ステンレス鋳鋼の製法は、上記第１および第２の二相ス
テンレス鋳鋼を溶解後、遠心鋳造法を用いて鋳造するも
のである。That is, the first of the duplex stainless cast steel of the present invention
Of Cr: 20-35% by weight, Ni: 3-12% by weight, Mo: 0.5-6% by weight, Co: 0.01-0.
27% by weight, Cu: 0.1 to 3% by weight, N: 0.05 to
3% by weight, W: 1-3% by weight, C: 0.12% by weight or less, Si: 3% by weight or less, Mn: 5% by weight or less,
The balance consists of iron and unavoidable impurities, the second is
More preferable one of the above-mentioned first ones, Cr: 25
~ 27 wt%, Ni: 5.5-7 wt%, Mo: 3-
4.5% by weight, Co: 0.01 to 0.27% by weight, C
u: 0.5 to 1.5% by weight, N: 0.15 to 0.3% by weight, W: 1 to 1.5% by weight, C: 0.05% by weight or less,
Si: 1% by weight or less, Mn: 1% by weight or less, the balance consisting of iron and unavoidable impurities. The method for producing the duplex stainless cast steel of the present invention is one in which the first and second duplex stainless cast steels are melted and then cast by a centrifugal casting method.
【０００８】[0008]
【作用】本発明の二相ステンレス鋳鋼の成分および組成
の限定理由について述べる。FUNCTION The reasons for limiting the components and composition of the duplex stainless cast steel of the present invention will be described.
【０００９】Ｃｒは、二相ステンレス鋼の形成および耐
食性の向上のための基本的な元素であり、その添加量は
２０〜３５重量％（以下、％は特記しない限り重量％を
意味する）、好ましくは２５〜２７％である。２０％未
満では耐食性が低下し、３５％を超えると靱性が低下す
る。Cr is a basic element for forming duplex stainless steel and improving corrosion resistance, and the addition amount thereof is 20 to 35% by weight (hereinafter,% means% by weight unless otherwise specified), It is preferably 25 to 27%. If it is less than 20%, the corrosion resistance is lowered, and if it exceeds 35%, the toughness is lowered.
【００１０】Ｎｉは、鋼の靱性と耐孔食性を向上させる
元素であり、その添加量は３〜１２％、好ましくは５．
５〜７％である。３％未満では、オーステナイト相が消
失し、１２％を超えるとオーステナイト相の量が増大し
強度が低下する。Ni is an element that improves the toughness and pitting corrosion resistance of steel, and its addition amount is 3 to 12%, preferably 5.
It is 5 to 7%. If it is less than 3%, the austenite phase disappears, and if it exceeds 12%, the amount of the austenite phase increases and the strength decreases.
【００１１】Ｍｏは、耐局部腐食性、耐孔食性を向上さ
せ、その添加量は０．５〜６％、好ましくは３〜４．５
％である。０．５％未満では耐局部腐食性、耐孔食性が
劣化し、６％を超えると靱性が低下する。Mo improves local corrosion resistance and pitting corrosion resistance, and the addition amount thereof is 0.5 to 6%, preferably 3 to 4.5.
%. If it is less than 0.5%, the local corrosion resistance and pitting corrosion resistance deteriorate, and if it exceeds 6%, the toughness decreases.
【００１２】Ｃｏは、耐隙間腐食性を向上させると共に
オーステナイト相中に濃縮して伸びを向上させ、その添
加量は０．０１〜０．２７％である。０．０１％未満で
は耐隙間腐食性が充分でなく、０．２７％を超えると耐
力が低下する。Co improves the crevice corrosion resistance and concentrates in the austenite phase to improve the elongation, and the addition amount thereof is 0.01 to 0.27%. If it is less than 0.01%, the crevice corrosion resistance is not sufficient, and if it exceeds 0.27%, the yield strength decreases.
【００１３】Ｃｕは、非酸化性環境での耐食性、特に耐
孔食性を向上させ、その添加量は０．１〜３％、好まし
くは０．５〜１．５％である。０．１％未満ではその効
果が少なく、３％を超えると鋳造偏析をおこして強度低
下を招く。Cu improves the corrosion resistance in a non-oxidizing environment, especially the pitting corrosion resistance, and the addition amount thereof is 0.1 to 3%, preferably 0.5 to 1.5%. If it is less than 0.1%, its effect is small, and if it exceeds 3%, segregation of casting occurs and strength is lowered.
【００１４】Ｎは、耐孔食性、耐隙間腐食性を著しく向
上させ、その添加量は０．０５〜３％、好ましくは０．
１５〜０．３％である。０．０５％未満ではその効果が
少なく、３％を超えるとオーステナイト相の量が過多に
なったり鋼中に気泡を生じ欠陥となったりする。N significantly improves pitting corrosion resistance and crevice corrosion resistance, and the addition amount thereof is 0.05 to 3%, preferably 0.1.
It is 15 to 0.3%. If it is less than 0.05%, its effect is small, and if it exceeds 3%, the amount of austenite phase becomes excessive, or bubbles occur in the steel, resulting in defects.
【００１５】Ｗは、フェライト相を強化し耐力を著しく
向上させると共に耐隙間腐食性を向上させ、その添加量
は１〜３％、好ましくは１〜１．５％である。１％未満
ではその効果が充分でなく、３％を超えると靱性が低下
する。W strengthens the ferrite phase to remarkably improve the yield strength and also improves the crevice corrosion resistance, and the addition amount thereof is 1 to 3%, preferably 1 to 1.5%. If it is less than 1%, the effect is not sufficient, and if it exceeds 3%, the toughness decreases.
【００１６】Ｃは、オーステナイト相の生成元素であ
り、その添加量は０．１２％以下、好ましくは０．０５
％以下である。０．１２％を超えると、Ｃｒ炭化物を析
出し、延性、靱性、耐食性が低下する。C is an austenite phase forming element, and the addition amount thereof is 0.12% or less, preferably 0.05.
% Or less. If it exceeds 0.12%, Cr carbides are precipitated and ductility, toughness, and corrosion resistance are reduced.
【００１７】Ｓｉは、鋼溶製の際、溶鋼の脱酸および鋳
造性の確保のため必要であると共に耐食性を向上させ、
その添加量は３％以下、好ましくは１％以下である。３
％を超えると、σ相が析出して強度や耐食性が低下す
る。Si is necessary for deoxidizing molten steel and ensuring castability during melting of steel, and improves corrosion resistance.
The amount added is 3% or less, preferably 1% or less. Three
%, The σ phase precipitates and the strength and corrosion resistance decrease.
【００１８】Ｍｎは、鋼溶製の際、溶鋼の脱酸、脱硫の
ため必要であり、その添加量は５％以下、好ましくは１
％以下である。５％を超えると、オーステナイト相の量
が増大し機械特性が劣化する。Mn is necessary for deoxidation and desulfurization of molten steel during melting of steel, and its addition amount is 5% or less, preferably 1%.
% Or less. If it exceeds 5%, the amount of austenite phase increases and mechanical properties deteriorate.
【００１９】本発明の二相ステンレス鋳鋼を製造する方
法は、通常の溶解鋳造方法が採用できるが、遠心鋳造法
は、遠心力の作用によって溶鋼中の非金属介在物やガス
が遠心分離され緻密健全な製品が得易いので、好ましい
鋳造方法である。As the method for producing the duplex stainless cast steel of the present invention, an ordinary melting and casting method can be adopted. In the centrifugal casting method, however, non-metallic inclusions and gas in the molten steel are centrifugally separated by the action of centrifugal force so as to be dense This is a preferable casting method because a sound product can be easily obtained.
【００２０】[0020]
【実施例】高周波大気溶解で所定の組成に溶解した溶湯
を、竪型遠心鋳造装置の回転数７５０ｒｐｍで回転する
直径５０ｃｍの円筒形鋳型に鋳造して、肉厚１５ｃｍの
リング状鋳塊とした。この後、鋳塊に１１５０℃、２時
間の熱処理を施した。得られた熱処理後の鋳塊から引張
り試験片、孔食電位測定試験片および検鏡試験片を切り
出した後、この鋳塊を遠心分離試験に供した。EXAMPLE A molten metal melted to a predetermined composition by high-frequency atmospheric melting was cast into a cylindrical mold having a diameter of 50 cm rotating at a rotation speed of 750 rpm of a vertical centrifugal casting device to obtain a ring-shaped ingot having a thickness of 15 cm. . Then, the ingot was heat-treated at 1150 ° C. for 2 hours. A tensile test piece, a pitting potential measurement test piece and a microscopic test piece were cut out from the obtained heat-treated ingot, and the ingot was subjected to a centrifugal separation test.
【００２１】なお、引張り試験は、ＪＩＳ Ｚ ２２０
１に準拠し、同ＪＩＳの４号試験片を使用した。その結
果から０．２％耐力と伸びを測定した。また、孔食電位
の測定は、シリコンラバーを押しつけて隙間を作った試
験片を使用し、ＪＩＳ Ｇ０５７７に準拠した。さら
に、介在物の個数は、試験片の表面を研磨した後、光学
顕微鏡でその４ｍｍ角内の粒径２μｍ以上の介在物を数
えて断面積１ｍｍ2 当りに換算した。また、試験片の表
面をエッチング処理し、光学顕微鏡でその組織を観察し
た。The tensile test is conducted according to JIS Z 220.
According to 1, the JIS No. 4 test piece was used. From the results, 0.2% proof stress and elongation were measured. Further, the measurement of the pitting potential was performed in accordance with JIS G0577 using a test piece in which a silicone rubber was pressed to form a gap. Furthermore, after the surface of the test piece was polished, the number of inclusions was calculated by counting the inclusions having a particle size of 2 μm or more in a 4 mm square with a cross section of 1 mm 2 with an optical microscope. Further, the surface of the test piece was subjected to etching treatment, and its structure was observed with an optical microscope.
【００２２】各試験の鋳鋼試験片の組成（％）を表１
に、得られた試験結果を表２に示す。なお、上記組織の
観察では、すべての試験においてフェライト相およびオ
ーステナイト相からなる明瞭な二相組織が観察された。The composition (%) of the cast steel test piece of each test is shown in Table 1.
Table 2 shows the test results obtained. In the observation of the above structure, a clear two-phase structure composed of a ferrite phase and an austenite phase was observed in all tests.
【００２３】[0023]
【表１】 Ｃｒ Ｎｉ Ｍｏ Ｃｏ Ｃｕ Ｎ Ｗ Ｖ Ｃ Ｓｉ Ｍｎ Ｆｅ 実施例１ 26.9 6.68 3.34 0.01 0.90 0.16 1.2 ― 0.03 0.61 0.72 残 〃 ２ 〃 〃 〃 0.08 〃 〃 〃 ― 〃 〃 〃 〃 〃 ３ 〃 〃 〃 0.27 〃 〃 〃 ― 〃 〃 〃 〃 比較例１ 〃 〃 〃 0.33 〃 〃 〃 ― 〃 〃 〃 〃 〃 ２ 〃 〃 〃 0.08 〃 〃 0.8 ― 〃 〃 〃 〃 実施例４ 〃 〃 〃 0.08 〃 〃 1.1 ― 〃 〃 〃 〃 〃 ５ 〃 〃 〃 0.08 〃 〃 1.5 ― 〃 〃 〃 〃 〃 ６ 〃 〃 〃 0.08 〃 〃 2.0 ― 〃 〃 〃 〃 〃 ７ 〃 〃 〃 0.08 〃 〃 2.9 ― 〃 〃 〃 〃 〃 ８ 20.6 11.8 〃 〃 〃 〃 1.2 ― 〃 〃 〃 〃 〃 ９ 34.2 3.42 〃 〃 〃 〃 〃 ― 〃 〃 〃 〃 〃１０ 26.9 6.68 0.63 〃 〃 〃 〃 ― 〃 〃 〃 〃 〃１１ 〃 〃 5.87 〃 〃 〃 〃 ― 〃 〃 〃 〃 〃１２ 〃 〃 3.34 〃 0.15 0.06 〃 ― 〃 〃 〃 〃 〃１３ 〃 〃 〃 〃 2.87 2.93 〃 ― 〃 〃 〃 〃 〃１４ 〃 〃 〃 〃 0.90 0.16 〃 ― 0.12 2.96 4.98 〃 従来例１ 19.2 13.0 3.51 ― ― ― ― ― 0.02 0.50 0.80 〃 〃 ２ 25.1 4.52 2.25 ― ― ― ― ― 0.05 0.60 0.70 〃 〃 ３ 24.8 5.87 3.03 ― 0.79 0.13 1.04 0.89 0.02 0.52 1.04 〃 〃 ４ 26.0 6.65 3.43 ― 0.58 0.12 0.15 0.08 0.01 0.61 0.55 〃 〃 ５ 25.0 4.11 1.05 ― 1.17 0.19 0.57 ― 0.05 2.07 0.58 〃 〃 ６ 25.2 7.07 3.42 0.48 1.87 0.17 0.99 ― 0.03 0.96 0.86 〃 [Table 1] Cr Ni Mo Co Cu NWVC Si Mn Fe Example 1 26.9 6.68 3.34 0.01 0.90 0.16 1.2 ― 0.03 0.61 0.72 Remaining 〃 2 〃 〃 〃 〃 〃 ― 〃 〃 〃 〃 〃 〃 〃 〃 〃 〃 〃 0.27 undefined undefined undefined - undefined undefined undefined undefined Comparative example 1 undefined undefined undefined 0.33 undefined undefined undefined - undefined undefined undefined undefined undefined 2 undefined undefined undefined 0.08 undefined undefined 0.8 - undefined undefined undefined undefined example 4 undefined undefined undefined 0.08 undefined undefined 1.1 - 〃 undefined undefined undefined undefined 5 undefined undefined undefined 0.08 undefined undefined 1.5 - undefined undefined undefined undefined undefined 6 undefined undefined undefined 0.08 undefined undefined 2.0 - undefined undefined undefined undefined undefined 7 undefined undefined undefined 0.08 undefined undefined 2.9 - undefined undefined undefined undefined undefined 8 20.6 11.8 〃 undefined undefined undefined 1.2 - undefined undefined undefined undefined undefined 9 34.2 3.42 undefined undefined undefined undefined undefined - undefined undefined undefined undefined 〃10 26.9 6.68 0.63 undefined undefined undefined undefined - undefined undefined undefined undefined undefined undefined 〃11 5.87 undefined undefined undefined undefined - undefined undefined undefined 〃 〃 12 〃 〃 3.34 〃 0.15 0.06 〃 ― 〃 〃 〃 〃 〃 〃 〃 〃 2.87 2.93 〃 〃 〃 〃 〃 〃 〃 〃 〃 〃 〃 〃 〃 〃 〃 〃 〃 0.90 0.16 〃 ― 0.12 2.96 4.98 〃 Conventional example 1 19.2 13.0 3.51 ― ― ― ― ― 0.02 0.50 0.80 〃 〃 2 25.1 4.52 2.25 ― ― ― ― 0.05 0.60 0.70 〃 〃 3 24.8 5.87 3.03 ― 0.79 0.13 1.04 0.89 0.02 0.5 1.04 〃 〃 4 26.0 6.65 3.43 ― 0.58 0.12 0.15 0.08 0.01 0.61 0.55 〃 〃 5 25.0 4.11 1.05 ― 1.17 0.19 0.57 ― 0.05 2.07 0.58 〃 〃 6 25.2 7.07 3.42 0.48 1.87 0.17 0.99 ― 0.03 0.96 0.86 〃
【００２４】[0024]
【表２】 ［引張り試験］ 0.2%耐力 伸び 孔食電位 介在物の個数 遠心分離試験 (kgf/mm2) (％) （ｍＶ） （個／mm2） (スケール発生の有無) 実施例１ 61.2 29.5 >1000 36 なし 〃 ２ 63.1 25.1 〃 31 〃 〃 ３ 56.0 32.0 〃 42 〃 比較例１ 23.6 39.8 〃 41 〃 〃 ２ 56.4 25.5 780 43 あり 実施例４ 55.7 28.6 >1000 32 なし 〃 ５ 58.1 28.4 〃 39 〃 〃 ６ 59.4 27.7 〃 41 〃 〃 ７ 61.2 27.2 〃 44 〃 〃 ８ 55.9 25.4 〃 36 〃 〃 ９ 63.1 30.8 950 38 〃 〃１０ 58.2 28.3 880 39 〃 〃１１ 59.3 25.8 >1000 46 〃 〃１２ 63.3 25.6 820 41 〃 〃１３ 56.3 29.3 >1000 32 〃 〃１４ 59.8 26.0 〃 48 〃 従来例１ 22.0 43.0 610 47 あり 〃 ２ 41.0 22.0 700 42 〃 〃 ３ 58.6 22.4 810 40 なし 〃 ４ 50.1 31.0 >1000 42 〃 〃 ５ 59.2 23.2 720 43 あり 〃 ６ 54.3 35.1 >1000 39 なし[Table 2] [Tensile test] 0.2% yield strength Elongation Pitting corrosion potential Number of inclusions Centrifuge test (kgf / mm 2 ) (%) (mV) (pieces / mm 2 ) (presence or absence of scale generation) Example 1 61.2 29.5> 1000 36 None 〃 2 63.1 25.1 〃 31 〃 〃 3 56.0 32.0 〃 42 〃 Comparative Example 1 23.6 39.8 〃 41 〃 〃 2 56.4 25.5 780 43 Yes Example 4 55.7 28.6> 1000 32 None 〃 5 ッ 58.1 〃 6 59.4 27.7 〃 41 〃 〃 7 61.2 27.2 〃 44 〃 〃 8 55.9 25.4 〃 36 〃 〃 9 63.1 30.8 950 38 〃 〃 10 58.2 28.3 880 39 〃 〃 10 〃 11 59.3 28.3 〃 13 56.3 29.3> 1000 32 〃 〃 14 59.8 26.0 〃 48 〃 Conventional example 1 22.0 43.0 610 47 Yes 〃 2 41.0 22.0 700 42 〃 〃 3 58.6 22.4 810 40 None 〃 4 50.1 31.0> 1000 42 〃 5 〃 5 〃 5 43 Yes 〃 6 54.3 35.1> 1000 39 No
【００２５】表２から、次のことが判る、即ち、（１）
実施例１〜１４では、いずれも０．２％耐力≧５５ｋｇ
ｆ／ｍｍ2 、伸び≧２５％および遠心分離試験でスケー
ル発生なしの３条件をすべて満足しているのに対し、比
較例１、２および従来例１〜６では、いずれも上記３条
件のうちの少なくとも１つを満足していない、（２）孔
食電位が８００ｍＶ以上の例はすべて、遠心分離試験で
スケールが全く発生しなかったのに対し、孔食電位が８
００ｍＶ未満の例はすべて遠心分離試験で１個所以上に
スケールの発生が観察された。From Table 2, the following can be seen: (1)
In each of Examples 1 to 14, 0.2% proof stress ≧ 55 kg
f / mm 2 , elongation ≧ 25%, and all three conditions without scale generation in the centrifugal separation test are satisfied, whereas Comparative Examples 1 and 2 and Conventional Examples 1 to 6 all have the above three conditions. In all of the cases where (2) the pitting potential was 800 mV or more, the scale did not occur at all in the centrifugation test, whereas the pitting potential was 8
In all the examples of less than 00 mV, the generation of scale was observed at one or more places in the centrifugation test.
【００２６】[0026]
【発明の効果】本発明により、０．２％耐力が５５ｋｇ
ｆ／ｍｍ2 以上、伸びが２５％以上で、耐隙間腐食性に
優れた二相ステンレス鋳鋼を提供することができる。According to the present invention, the 0.2% proof stress is 55 kg.
It is possible to provide a duplex stainless cast steel having f / mm 2 or more and an elongation of 25% or more and excellent in crevice corrosion resistance.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 美馬 良一 横浜市旭区東希望ヶ丘175−１，Ａ−203 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryoichi Mima 17-1, Higashi Kibogaoka, Asahi-ku, Yokohama, A-203
Claims (4)
２重量％、Ｍｏ：０．５〜６重量％、Ｃｏ：０．０１〜
０．２７重量％、Ｃｕ：０．１〜３重量％、Ｎ：０．０
５〜３重量％、Ｗ：１〜３重量％、Ｃ：０．１２重量％
以下、Ｓｉ：３重量％以下、Ｍｎ：５重量％以下を含
み、残部が鉄および不可避不純物からなる二相ステンレ
ス鋳鋼。1. Cr: 20 to 35% by weight, Ni: 3-1
2% by weight, Mo: 0.5 to 6% by weight, Co: 0.01 to
0.27% by weight, Cu: 0.1 to 3% by weight, N: 0.0
5 to 3% by weight, W: 1 to 3% by weight, C: 0.12% by weight
Hereinafter, a duplex stainless cast steel containing Si: 3 wt% or less and Mn: 5 wt% or less, with the balance being iron and inevitable impurities.
〜７重量％、Ｍｏ：３〜４．５重量％、Ｃｏ：０．０１
〜０．２７重量％、Ｃｕ：０．５〜１．５重量％、Ｎ：
０．１５〜０．３重量％、Ｗ：１〜１．５重量％、Ｃ：
０．０５重量％以下、Ｓｉ：１重量％以下、Ｍｎ：１重
量％以下を含み、残部が鉄および不可避不純物からなる
二相ステンレス鋳鋼。2. Cr: 25 to 27% by weight, Ni: 5.5
˜7% by weight, Mo: 3 to 4.5% by weight, Co: 0.01
~ 0.27 wt%, Cu: 0.5-1.5 wt%, N:
0.15-0.3 wt%, W: 1-1.5 wt%, C:
Duplex stainless cast steel containing 0.05 wt% or less, Si: 1 wt% or less, Mn: 1 wt% or less, and the balance being iron and inevitable impurities.
載の二相ステンレス鋳鋼。3. The duplex stainless cast steel according to claim 1, which is obtained by a centrifugal casting method.
請求項１または２に記載の二相ステンレス鋳鋼の製法。4. The method for producing a duplex stainless cast steel according to claim 1, wherein the casting after melting is performed using a centrifugal casting method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16478994A JPH0813094A (en) | 1994-06-24 | 1994-06-24 | Duplex stainless cast steel and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16478994A JPH0813094A (en) | 1994-06-24 | 1994-06-24 | Duplex stainless cast steel and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0813094A true JPH0813094A (en) | 1996-01-16 |
Family
ID=15799977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16478994A Pending JPH0813094A (en) | 1994-06-24 | 1994-06-24 | Duplex stainless cast steel and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0813094A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003503596A (en) * | 1999-06-29 | 2003-01-28 | サンドビック アクティエボラーグ | Duplex stainless steel |
| JP2004520491A (en) * | 2001-04-27 | 2004-07-08 | リサーチ インスティチュート オブ インダストリアル サイエンス アンド テクノロジー | High manganese duplex stainless steel having excellent hot workability and method for producing the same |
| KR100460346B1 (en) * | 2002-03-25 | 2004-12-08 | 이인성 | Super duplex stainless steel with a suppressed formation of intermetallic phases and having an excellent corrosion resistance, embrittlement resistance, castability and hot workability |
| WO2005001151A1 (en) * | 2003-06-30 | 2005-01-06 | Sumitomo Metal Industries, Ltd. | Duplex stainless steel |
| US20080138232A1 (en) * | 2004-11-04 | 2008-06-12 | Pasi Kangas | Duplex Stainless Steel |
| EP3502294A1 (en) * | 2017-12-22 | 2019-06-26 | Tubacex Innovación A.I.E. | Duplex stainless steel resistant to corrosion |
| WO2023191594A1 (en) * | 2022-03-31 | 2023-10-05 | 스템코 주식회사 | Metal plate, deposition mask using same, and manufacturing method therefor |
-
1994
- 1994-06-24 JP JP16478994A patent/JPH0813094A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003503596A (en) * | 1999-06-29 | 2003-01-28 | サンドビック アクティエボラーグ | Duplex stainless steel |
| JP2004520491A (en) * | 2001-04-27 | 2004-07-08 | リサーチ インスティチュート オブ インダストリアル サイエンス アンド テクノロジー | High manganese duplex stainless steel having excellent hot workability and method for producing the same |
| US8043446B2 (en) * | 2001-04-27 | 2011-10-25 | Research Institute Of Industrial Science And Technology | High manganese duplex stainless steel having superior hot workabilities and method manufacturing thereof |
| KR100460346B1 (en) * | 2002-03-25 | 2004-12-08 | 이인성 | Super duplex stainless steel with a suppressed formation of intermetallic phases and having an excellent corrosion resistance, embrittlement resistance, castability and hot workability |
| WO2005001151A1 (en) * | 2003-06-30 | 2005-01-06 | Sumitomo Metal Industries, Ltd. | Duplex stainless steel |
| US20080138232A1 (en) * | 2004-11-04 | 2008-06-12 | Pasi Kangas | Duplex Stainless Steel |
| EP3502294A1 (en) * | 2017-12-22 | 2019-06-26 | Tubacex Innovación A.I.E. | Duplex stainless steel resistant to corrosion |
| WO2019122266A1 (en) * | 2017-12-22 | 2019-06-27 | Tubacex Innovación A.I.E. | Duplex stainless steel resistant to corrosion |
| WO2023191594A1 (en) * | 2022-03-31 | 2023-10-05 | 스템코 주식회사 | Metal plate, deposition mask using same, and manufacturing method therefor |
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