JP2008121048A - Ni-BASED ALLOY HAVING EXCELLENT CORROSION RESISTANCE AND WEAR RESISTANCE, AND CONDUCTOR ROLL MADE OF THE Ni-BASED ALLOY - Google Patents
Ni-BASED ALLOY HAVING EXCELLENT CORROSION RESISTANCE AND WEAR RESISTANCE, AND CONDUCTOR ROLL MADE OF THE Ni-BASED ALLOY Download PDFInfo
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この発明は、酸に対して優れた耐食性を有すると共に耐摩耗性を有するＮｉ基合金およびこのＮｉ基合金からなる連続電気めっきラインのコンダクターロールに関するものである。 The present invention relates to a Ni-based alloy having excellent corrosion resistance against acid and wear resistance, and a conductor roll of a continuous electroplating line made of this Ni-based alloy.
酸に対して優れた耐食性を有すると共に耐摩耗性を有するＮｉ基合金として、質量％で（以下、％は質量％を示す）、Ｃｒ：１８〜２８％未満、Ｍｏ：１７超〜２３％をＣｒ＋Ｍｏ：３５〜４５％となるように含有し、さらに必要に応じて、
（ａ）ＣｕおよびＶのうちの１種または２種：０．１〜５％、
（ｂ）ＢおよびＣａのうちの１種または２種：０．００１〜０．０１％、
（ｃ）Ｃｏ：０．１〜５％、
以上（ａ）〜（ｃ）のうちの１種または２種以上を含有し、残りがＮｉおよび不可避不純物からなる組成、並びに素地中に位相的最蜜構造を有するμ相（Ｎｉ７Ｍｏ６型金属間化合物相）が分散析出した組織を有する強度、硬度および耐食性に優れた析出強化型Ｎｉ基合金が知られている（特許文献１参照）。
(A) One or two of Cu and V: 0.1 to 5%,
(B) One or two of B and Ca: 0.001 to 0.01%,
(C) Co: 0.1 to 5%,
A μ phase (Ni 7 Mo 6 type) containing one or more of the above (a) to (c), the remainder comprising Ni and inevitable impurities, and a topologically honey structure in the substrate A precipitation-strengthened Ni-based alloy having a structure in which an intermetallic compound phase) is dispersed and precipitated and excellent in strength, hardness and corrosion resistance is known (see Patent Document 1).
しかし、従来の強度、硬度および耐食性に優れた析出強化型Ｎｉ基合金からなるロールを連続電気めっきラインのコンダクターロールとして使用すると、連続電気めっきラインに設置されたコンダクターロールは、高温に保たれた強酸性めっき液中に長時間浸漬された状態を保ちながらストリップなどを搬送する働きも行なうことから、激しく腐食されて孔食が発生すると同時に摩擦により摩耗する。コンダクターロール表面に孔食が生じると、孔食によって生じた孔がめっき層に転写し、めっき層表面に突起が生じるなどして厚さが不均一となり、またコンダクターロールが摩耗するとロールの径に微小のばらつきが発生し、めっきの厚さにバラツキが生じるので好ましくない。そのため、コンダクターロールに腐食および摩耗が進行すると、コンダクターロールを交換しなければならなくなるが、コンダクターロールの交換には時間がかかるために連続電気めっきライン稼動効率が低下することとなる。したがって、従来よりも一層耐食性および耐摩耗性に優れたＮｉ基合金を開発し、この耐食性および耐摩耗性に優れたＮｉ基合金からなるコンダクターロールを使用してコンダクターロールの交換回数を減らすべく研究がなされている。 However, when a conventional roll made of a precipitation-strengthened Ni-based alloy having excellent strength, hardness and corrosion resistance is used as a conductor roll of a continuous electroplating line, the conductor roll installed in the continuous electroplating line was kept at a high temperature. Since the strip is transported while being kept immersed in the strong acid plating solution for a long time, it is severely corroded to generate pitting corrosion and wear due to friction. When pitting corrosion occurs on the surface of the conductor roll, the holes generated by pitting corrosion are transferred to the plating layer, and protrusions are formed on the plating layer surface, resulting in uneven thickness. This is not preferable because minute variations occur and the plating thickness varies. Therefore, when corrosion and wear progress in the conductor roll, it becomes necessary to replace the conductor roll. However, since the replacement of the conductor roll takes time, the operation efficiency of the continuous electroplating line is lowered. Therefore, we have developed a Ni-based alloy that is much more resistant to corrosion and wear than before, and researched to reduce the number of conductor roll replacements by using a conductor roll made of this Ni-based alloy with excellent corrosion resistance and wear resistance. Has been made.
そこで、本発明者らは、従来よりも一層耐食性および耐摩耗性に優れたＮｉ基合金を開発し、この耐食性および耐摩耗性に優れたＮｉ基合金からなるコンダクターロールを得るべく鋭意研究を行った。その結果、
（イ）質量％（以下、％は質量％を示す）でＣｒ：１８超〜２１％未満、Ｍｏ：１８超〜２１％未満％、Ｔａ：１超〜３．４％未満、Ｍｇ：０．００１〜０．０５％、Ｎ：０．００１〜０．０４％、Ｍｎ：０．０５〜０．５％、Ｆｅ：０．０１〜２％、Ｓｉ：０．０１〜０．１％、Ａｌ：０．０１〜０．５％、Ｃｕ：０．０１〜０．１％未満、Ｖ：０．００１〜０．１％未満含有し、残部がＮｉおよび不可避不純物からなり、不可避不純物として含まれるＣ量を０.０５％以下に調整した組成を有し、かつ素地中に微細な金属間化合物が分散析出している組織を有する析出強化型Ｎｉ基合金は、耐食性および耐摩耗性に一層優れ、この析出強化型Ｎｉ基合金からなるロールを連続電気めっきラインのコンダクターロールとして使用すると、使用寿命が一層長くなり、したがって、連続電気めっきラインにおけるコンダクターロールの交換回数を減らすことができる、
（ロ）前記素地中に分散析出する金属間化合物はγ’型金属間化合物相であることが一層好ましい、という研究結果が得られたのである。
Therefore, the present inventors have developed a Ni-based alloy that is more excellent in corrosion resistance and wear resistance than in the past, and conducted earnest research to obtain a conductor roll made of this Ni-based alloy that is excellent in corrosion resistance and wear resistance. It was. as a result,
(B) Cr: more than 18 to less than 21%, Mo: more than 18 to less than 21%, Ta: more than 1 to less than 3.4%, Mg: 0.3%. 001-0.05%, N: 0.001-0.04%, Mn: 0.05-0.5%, Fe: 0.01-2%, Si: 0.01-0.1%, Al : 0.01 to 0.5%, Cu: 0.01 to less than 0.1%, V: 0.001 to less than 0.1%, the balance is made of Ni and inevitable impurities, and is included as inevitable impurities Precipitation-strengthened Ni-base alloys having a composition in which the C content is adjusted to 0.05% or less and having a structure in which fine intermetallic compounds are dispersed and precipitated in the substrate are more excellent in corrosion resistance and wear resistance. When this roll made of precipitation-strengthened Ni-base alloy is used as a conductor roll in a continuous electroplating line, Longer life, thus reducing the number of conductor roll replacement in continuous electroplating line,
(B) It has been obtained that the intermetallic compound dispersed and precipitated in the substrate is more preferably a γ 'type intermetallic compound phase.
この発明は、かかる研究結果に基づいてなされたものであって、
（１）質量％で、Ｃｒ：１８超〜２１％未満、Ｍｏ：１８超〜２１％未満％、Ｔａ：１超〜３．４％未満、Ｍｇ：０．００１〜０．０５％、Ｎ：０．００１〜０．０４％、Ｍｎ：０．０５〜０．５％、Ｆｅ：０．０１〜２％、Ｓｉ：０．０１〜０．１％、Ａｌ：０．０１〜０．５％、Ｃｕ：０．０１〜０．１％未満、Ｖ：０．００１〜０．１％未満含有し、残部がＮｉおよび不可避不純物からなり、不可避不純物として含まれるＣ量を０.０５％以下に調整した組成を有し、かつ素地中に微細な金属間化合物が分散析出している組織を有する耐食性および耐摩耗性に優れた析出強化型Ｎｉ基合金、
（２）前記（１）記載の金属間化合物は、γ’型金属間化合物相である耐食性および耐摩耗性に優れた析出強化型Ｎｉ基合金、
（３）前記（１）または（２）記載の組成を有する耐食性および耐摩耗性に優れた析出強化型Ｎｉ基合金からなる連続電気めっきラインのコンダクターロール、に特徴を有するものである。
The present invention has been made based on the results of such research,
(1) By mass%, Cr: more than 18 to less than 21%, Mo: more than 18 to less than 21%, Ta: more than 1 to less than 3.4%, Mg: 0.001 to 0.05%, N: 0.001-0.04%, Mn: 0.05-0.5%, Fe: 0.01-2%, Si: 0.01-0.1%, Al: 0.01-0.5% Cu: 0.01 to less than 0.1%, V: less than 0.001 to 0.1%, the balance is made of Ni and inevitable impurities, and the amount of C contained as inevitable impurities is 0.05% or less A precipitation-strengthened Ni-base alloy having an adjusted composition and having a structure in which fine intermetallic compounds are dispersed and precipitated in the substrate and excellent in corrosion resistance and wear resistance;
(2) The intermetallic compound described in (1) is a precipitation strengthened Ni-based alloy having excellent corrosion resistance and wear resistance, which is a γ 'type intermetallic compound phase,
(3) It is characterized by a conductor roll of a continuous electroplating line made of a precipitation-strengthened Ni-base alloy having the composition described in (1) or (2) and excellent in corrosion resistance and wear resistance.
次に、この発明の析出強化型Ｎｉ基合金の合金組成における各元素の限定理由について詳述する。 Next, the reasons for limitation of each element in the alloy composition of the precipitation strengthened Ni-based alloy of the present invention will be described in detail.
Ｃｒ、Ｍｏ：
ＣｒおよびＭｏは、共に耐食性を向上させると同時に、一旦、単一相に固溶化したのち、適正な温度範囲で長時間時効熱処理することにより、素地中にγ’型金属間化合物相（Ｎｉ２（Ｃｒ、Ｍｏ）型金属間化合物相）を微細に析出させることにより析出硬化し、耐摩耗性を向上させる効果がある。その場合、Ｃｒは１８％を超えて含有することが必要であるが、２１％以上含有すると、Ｍｏとの組み合わせにおいて単一相化が困難となり、粗大なμ相（Ｎｉ７Ｍｏ６型金属間化合物相）を形成してしまい、耐食性劣化をもたらすので好ましくない。したがって、Ｃｒの含有量を１８超〜２１％未満に定めた。一層好ましくは、１８．５〜２０．５％である。
同様にＭｏは１８％を超えて含有することが必要であるが、２１％以上含有すると、Ｃｒとの組み合わせにおいて単一相化が困難となり、粗大なμ相を形成してしまい、耐食性劣化をもたらすので好ましくない。したがって、Ｍｏの含有量を１８超〜２１％未満に定めた。一層好ましくは、１８．５〜２０．５％である。
Cr, Mo:
Both Cr and Mo improve corrosion resistance, and at the same time, once solidified into a single phase and then subjected to long-term aging heat treatment at an appropriate temperature range, the γ′-type intermetallic compound phase (Ni 2 The (Cr, Mo) type intermetallic compound phase) is precipitated and hardened by fine precipitation, thereby improving the wear resistance. In that case, Cr is required to contain more than 18%, but if it contains 21% or more, it becomes difficult to form a single phase in combination with Mo and coarse μ phase (between Ni 7 Mo 6 type metal) Compound phase) is formed and corrosion resistance is deteriorated. Therefore, the Cr content is determined to be more than 18 to less than 21%. More preferably, it is 18.5 to 20.5%.
Similarly, Mo needs to be contained in excess of 18%. However, if it is contained in an amount of 21% or more, it becomes difficult to form a single phase in combination with Cr, and a coarse μ phase is formed, resulting in corrosion resistance deterioration. This is not preferable. Therefore, the Mo content is determined to be more than 18 to less than 21%. More preferably, it is 18.5 to 20.5%.
Ｔａ：
Ｔａは耐孔食性を一段と改善する効果があり、Ｔａを含むＮｉ−Ｃｒ−Ｍｏ系合金を固溶化処理し、その後時効処理することによりＮｉ−Ｃｒ−Ｍｏ系合金の耐孔食性を著しく改善することができるが、Ｔａを１％以下添加しても十分な耐孔食性を改善する効果が得られないので好ましくなく、一方、３．４％を越えて含有すると、逆に耐孔食性が劣化してしまうので好ましくない。したがって、Ｔａの含有量を１超〜３．４％に定めた。一層好ましい範囲は、１．１〜２．５％である。
Ta:
Ta has the effect of further improving the pitting corrosion resistance. The Ni—Cr—Mo alloy containing Ta is subjected to a solution treatment, followed by aging treatment, thereby significantly improving the pitting corrosion resistance of the Ni—Cr—Mo alloy. However, even if Ta is added in an amount of 1% or less, it is not preferable because sufficient effect of improving the pitting corrosion resistance cannot be obtained. On the other hand, if it exceeds 3.4%, the pitting corrosion resistance is deteriorated. This is not preferable. Therefore, the content of Ta is determined to be more than 1 to 3.4%. A more preferable range is 1.1 to 2.5%.
Ｎ、ＭｎおよびＭｇ：
Ｎ、ＭｎおよびＭｇを共存させることにより、耐孔食性を含む耐食性全般を劣化させる粗大なμ相（Ｎｉ７Ｍｏ６型金属間化合物相）の生成を抑制することができる。すなわち、Ｎ、ＭｎおよびＭｇは母相であるＮｉ-ｆｃｃ相を安定化させ、Ｃｒ、ＭｏおよびＴａの固溶化を促進し、前記μ相を析出し難くする。その効果として、耐摩耗性を付与する際に実施する時効処理時に、μ相の析出を抑制し、優先的にγ’相を微細に析出させることで耐食性劣化の抑止や耐摩耗性付与が可能になるのである。しかし、Ｎの含有量が０．００１％未満ではμ相生成を抑制する効果がなく、したがって、時効処理により過剰なμ相生成を許し、その結果として耐孔食性の劣化や十分な耐摩耗性付与ができなくなるので好ましくない。一方、Ｎを０．０４％を超えて含有すると窒化物を形成し高温加工性が劣化するためＮの含有量を０．００１〜０．０４％（一層好ましくは、０．００５〜０．０３％）とした。
同様に、Ｍｎの含有量が０．０５％未満ではμ相生成を抑制する効果がなく、したがって、耐孔食性を改善すると同時に十分な耐摩耗性を付与することができなくなるので好ましくない。一方、Ｍｎを０．５％を超えて含有するとμ相生成を抑制する効果がなくなり、耐孔食性が劣化すると同時に十分な耐摩耗性が得られないので好ましくない。したがって、Ｍｎの含有量を０．０５〜０．５％（一層好ましくは、０．１〜０．４％）とした。
同様に、Ｍｇの含有量が０．００１％未満ではμ相生成を抑制する効果がなく、したがって、耐孔食性を改善すると同時に十分な耐摩耗性を付与することができなくなるので好ましくない。一方、Ｍｇを０．０５％を超えて含有するとμ相生成を抑制する効果がなくなり、耐孔食性が劣化すると同時に十分な耐摩耗性が得られないので好ましくない。したがって、Ｍｇの含有量を０．００１〜０．０５％（一層好ましくは、０．００２％〜０．０４％）とした。
なお、これら３元素の効果はそれぞれ等価ではなく、３元素が同時に所定の範囲で含有しないと効果がないことを見出している。
N, Mn and Mg:
By making N, Mn, and Mg coexist, generation of a coarse μ phase (Ni 7 Mo 6 type intermetallic compound phase) that deteriorates overall corrosion resistance including pitting corrosion resistance can be suppressed. That is, N, Mn, and Mg stabilize the Ni-fcc phase that is the parent phase, promote solid solution of Cr, Mo, and Ta, and make the μ phase difficult to precipitate. As an effect of this, it is possible to suppress corrosion resistance deterioration and impart wear resistance by preferentially precipitating the γ 'phase and preferentially precipitating the γ' phase during the aging treatment performed when imparting wear resistance. It becomes. However, if the N content is less than 0.001%, there is no effect of suppressing μ phase formation, and therefore excessive μ phase generation is allowed by aging treatment, resulting in deterioration of pitting corrosion resistance and sufficient wear resistance. This is not preferable because it cannot be applied. On the other hand, if N is contained in excess of 0.04%, a nitride is formed and high temperature workability deteriorates, so the N content is 0.001 to 0.04% (more preferably 0.005 to 0.03). %).
Similarly, if the Mn content is less than 0.05%, there is no effect of suppressing the formation of the μ phase, and therefore, the pitting corrosion resistance is improved and at the same time sufficient abrasion resistance cannot be imparted. On the other hand, if Mn is contained in excess of 0.5%, the effect of suppressing the μ phase formation is lost, and the pitting corrosion resistance is deteriorated, and at the same time, sufficient wear resistance cannot be obtained. Therefore, the Mn content is set to 0.05 to 0.5% (more preferably, 0.1 to 0.4%).
Similarly, if the Mg content is less than 0.001%, there is no effect of suppressing the formation of the μ phase, and therefore, it is not preferable because the pitting corrosion resistance can be improved and sufficient wear resistance cannot be imparted. On the other hand, if Mg is contained in excess of 0.05%, the effect of suppressing the formation of the μ phase is lost, and the pitting corrosion resistance is deteriorated, and at the same time sufficient abrasion resistance cannot be obtained. Therefore, the Mg content is set to 0.001 to 0.05% (more preferably 0.002% to 0.04%).
The effects of these three elements are not equivalent to each other, and it has been found that there is no effect unless the three elements are contained in a predetermined range at the same time.
Ｆｅ、ＳｉおよびＡｌ：
Ｆｅ、ＳｉおよびＡｌは耐摩耗性を向上させる効果がある。Ｆｅは０．０５％以上含有することで効果を示すものの、２％を超えて含有すると耐孔食性が劣化するので好ましくない。したがって、Ｆｅの含有量を０．０５％〜２％（一層好ましくは、０．１〜１％未満）とした。
同様にＳｉは０．０１％以上含有することで効果を示すものの、０．１％を超えて含有するとμ相生成を促進し、その結果、耐食性を劣化させるので好ましくない。したがって、Ｓｉの含有量を０．０１％〜０．１％（一層好ましくは、０．０２〜０．０５％）とした。
同様にＡｌは０．０１％以上含有することで効果を示すものの、０．５％を超えて含有すると耐食性を劣化させるので好ましくない。したがって、Ａｌの含有量を０．０１％〜０．５％（一層好ましくは、０．０２〜０．４％）とした。
Fe, Si and Al:
Fe, Si and Al have the effect of improving the wear resistance. Fe is effective when contained in an amount of 0.05% or more, but if it exceeds 2%, the pitting corrosion resistance deteriorates, which is not preferable. Therefore, the Fe content is set to 0.05% to 2% (more preferably, less than 0.1 to 1%).
Similarly, if Si is contained in an amount of 0.01% or more, the effect is exhibited, but if it exceeds 0.1%, the formation of the μ phase is promoted, and as a result, the corrosion resistance is deteriorated. Therefore, the Si content is set to 0.01% to 0.1% (more preferably 0.02 to 0.05%).
Similarly, Al is effective when contained in an amount of 0.01% or more, but if it exceeds 0.5%, corrosion resistance is deteriorated, which is not preferable. Therefore, the Al content is set to 0.01% to 0.5% (more preferably 0.02 to 0.4%).
Ｃｕ：
Ｃｕは硫酸系の腐食環境下で耐食性を向上させる効果があるが、Ｃｕを０．０１％以上含有することで効果を示すものの、０．１以上含有すると硫酸系の腐食環境下で耐食性を劣化させるので好ましくない。したがって、Ｃｕの含有量を０．０１％〜０．１％未満とした。
Cu:
Cu has the effect of improving the corrosion resistance in a sulfuric acid-based corrosive environment, but when Cu is contained in an amount of 0.1% or more, the corrosion resistance deteriorates in a sulfuric acid-based corrosive environment. This is not preferable. Therefore, the Cu content is set to 0.01% to less than 0.1%.
Ｖ：
Ｖはγ’相を析出しやすくする成分であるので添加するが、Ｖの含有量が０．００１％未満ではγ’相の析出に時間がかかるので好ましくなく、一方、Ｖを０．１％以上含有するとμ相が析出するようになって耐食性が劣化する。したがって、Ｖの含有量を０．００１〜０．１％未満とした。
V:
V is a component that facilitates the precipitation of the γ ′ phase, but is added. However, if the V content is less than 0.001%, it takes a long time to precipitate the γ ′ phase, while V is 0.1%. If it is contained above, the μ phase is precipitated and the corrosion resistance is deteriorated. Therefore, the content of V is set to 0.001 to less than 0.1%.
Ｃ：
Ｃは不可避不純物として含まれるが、Ｃが大量に含まれると結晶粒界近傍でＣｒと炭化物を形成し、金属イオンの溶出量を増大させることから耐食性を劣化させる。したがって、Ｃの含有量は少ないほど好ましく、不可避不純物に含まれるＣの含有量の上限を０．０５％と定めた。
C:
C is contained as an unavoidable impurity. However, if C is contained in a large amount, Cr and carbide are formed in the vicinity of the crystal grain boundary, and the amount of elution of metal ions is increased, thereby deteriorating the corrosion resistance. Therefore, the lower the C content, the better. The upper limit of the C content contained in the inevitable impurities is set to 0.05%.
この発明の耐食性および耐摩耗性に優れたＮｉ基合金は特に連続電気めっきラインのコンダクターロールの素材として優れており、鉄鋼産業上優れた効果をもたらすものである。 The Ni-based alloy having excellent corrosion resistance and wear resistance according to the present invention is particularly excellent as a material for a conductor roll of a continuous electroplating line, and provides excellent effects in the steel industry.
いずれもＣ含有量の少ない原料を用意し、これらを通常の高周波溶解炉を用いて溶解し鋳造して表１〜４に示される成分組成を有し、厚さ：４０ｍｍで約５ｋｇの重さを有するインゴットを作製し、このインゴットに１２３０℃で１０時間均質加熱処理を施し、１０００〜１２３０℃の範囲内に保持しながら、1回の熱間圧延で１ｍｍの厚さを減少させつつ、最終的に８ｍｍ厚とし、さらに１２００℃で３０分間保持し水焼入れすることにより固溶化処理を施し、ついで、６００℃で３０時間保持の時効処理を施し、この時効処理したインゴットの表面をバフ研磨することにより、表１〜４に示される成分組成を有する本発明Ｎｉ基合金板１〜２３、比較Ｎｉ基合金板１〜２３を作製した。これら本発明Ｎｉ基合金板１〜２３、比較Ｎｉ基合金板１〜２３にはいずれも素地中にγ’相が分散析出していた。
さらに、表４に示される成分組成を有し、厚さ：４０ｍｍで約５ｋｇの重さを有するインゴットを作製し、このインゴットに１２３０℃で５時間均質加熱処理を施し、１１００〜１２５０℃の範囲内に保持しながら、1回の熱間圧延で１ｍｍの厚さを減少させつつ、最終的に８ｍｍ厚とし、ついで、１０００℃で３０分間保持の時効処理を施し、この時効処理したインゴットの表面をバフ研磨することにより、表４に示される成分組成を有する従来Ｎｉ基合金板１〜３を用意した。これら従来Ｎｉ基合金板１〜３の素地中にはいずれもμ相が分散析出していた。
All prepared raw materials with low C content, and these were melted and cast using a normal high-frequency melting furnace to have the component composition shown in Tables 1 to 4, with a thickness of 40 mm and a weight of about 5 kg The ingot having a thickness of 1 mm is produced, and the ingot is subjected to a homogeneous heat treatment at 1230 ° C. for 10 hours and maintained within a range of 1000 to 1230 ° C., while reducing the thickness of 1 mm by one hot rolling, The thickness is 8 mm, and the solution is solidified by holding at 1200 ° C. for 30 minutes and quenching with water, followed by aging treatment at 600 ° C. for 30 hours, and buffing the surface of the ingot subjected to this aging treatment. Thus, the inventive Ni-base alloy plates 1 to 23 and comparative Ni-base alloy plates 1 to 23 having the component compositions shown in Tables 1 to 4 were produced. In each of the Ni-based alloy plates 1 to 23 of the present invention and the comparative Ni-based alloy plates 1 to 23, the γ ′ phase was dispersed and precipitated in the substrate.
Further, an ingot having a component composition shown in Table 4 and having a thickness of 40 mm and a weight of about 5 kg was produced, and this ingot was subjected to homogeneous heat treatment at 1230 ° C. for 5 hours, and a range of 1100 to 1250 ° C. While maintaining the inside, the thickness of 1 mm is reduced by one hot rolling, and finally the thickness is reduced to 8 mm, and then an aging treatment is performed for 30 minutes at 1000 ° C. The conventional Ni-based alloy plates 1 to 3 having the composition shown in Table 4 were prepared by buffing. In each of the conventional Ni-based alloy plates 1 to 3, the μ phase was dispersed and precipitated.
これら本発明Ｎｉ基合金板１〜２３、比較Ｎｉ基合金板１〜２３および従来Ｎｉ基合金板１〜３を使用して下記の条件で摩耗試験および腐食試験を行なった。 Using these Ni-based alloy plates 1 to 23 of the present invention, comparative Ni-based alloy plates 1 to 23 and conventional Ni-based alloy plates 1 to 3, wear tests and corrosion tests were performed under the following conditions.
摩耗試験：
本発明Ｎｉ基合金板１〜２３、比較Ｎｉ基合金板１〜２３および従来Ｎｉ基合金板１〜３をそれぞれ縦：２５ｍｍ、横：５０ｍｍ、厚さ：８ｍｍの寸法に切断して摩耗試験片を作製した。この試験片を用い、
摩耗距離：１００ｍｍ、
最終荷重：１８．２ｋｇ、
相手材：ＳＵＪ−２、
潤滑剤：なし、
摩耗速度：０．１２ｍ／ｓｅｃ、
の条件で大越式摩耗試験を実施し、比摩耗量を測定し、この比摩耗量を表１〜４に示すことにより耐摩耗性を評価した。ここで比摩耗量とは、大越式摩耗試験を実施することにより摩耗試験片が摩耗により減少した体積（体積減少量）をすべり距離と荷重で除した値である。
Abrasion test:
The present invention Ni-base alloy plates 1 to 23, comparative Ni-base alloy plates 1 to 23 and conventional Ni-base alloy plates 1 to 3 are each cut into dimensions of 25 mm in length, 50 mm in width, and 8 mm in thickness, and wear test pieces. Was made. Using this specimen,
Wear distance: 100 mm,
Final load: 18.2 kg
Opponent material: SUJ-2,
Lubricant: None,
Wear rate: 0.12 m / sec,
The Ogoshi type wear test was carried out under the conditions described above, the specific wear amount was measured, and the specific wear amount was shown in Tables 1 to 4 to evaluate the wear resistance. Here, the specific wear amount is a value obtained by dividing the volume (volume reduction amount) of the wear test piece reduced by wear by performing the Ogoshi wear test by the sliding distance and the load.
耐食試験：
本発明Ｎｉ基合金板１〜２３、比較Ｎｉ基合金板１〜２３および従来Ｎｉ基合金板１〜３をそれぞれ縦：３０ｍｍ、横：２０ｍｍ、厚さ：８ｍｍの寸法に切断して腐食試験片を作製し、この腐食試験片の表面を研磨し、最終的に耐水エメリー紙＃４００仕上げとした。これら研摩後の腐食試験片をアセトン中、超音波振動状態に５分間保持することにより脱脂し、これらを沸騰温度に保持したグリーン・デス液（１１．５％Ｈ２ＳＯ４＋１．２％ＨＣｌ＋１％ＦｅＣｌ３＋１％ＣｕＣｌ２）中に２４時間浸漬し、その後、腐食試験片の表面を観察し、孔食の有無を表１〜４に示した。
Corrosion resistance test:
Corrosion test pieces obtained by cutting the Ni-base alloy plates 1 to 23 of the present invention, the comparative Ni-base alloy plates 1 to 23 and the conventional Ni-base alloy plates 1 to 3 into dimensions of 30 mm in length, 20 mm in width, and 8 mm in thickness, respectively. The surface of this corrosion test piece was polished, and finally finished with a water-resistant emery paper # 400. These polished corrosion test pieces were degreased by holding them in an ultrasonic vibration state in acetone for 5 minutes, and these were kept at the boiling temperature. Green Dess solution (11.5% H 2 SO 4 + 1.2% HCl + 1) % FeCl 3 + 1% CuCl 2 ) for 24 hours, and then the surface of the corrosion test piece was observed, and the presence or absence of pitting corrosion was shown in Tables 1 to 4.
表１〜４に示された結果から、本発明Ｎｉ基合金板１〜２３は、従来Ｎｉ基合金板１〜３に比べて比摩耗率が低いことから耐摩耗性に優れており、さらに孔食の発生がないことから耐食性が優れていることが分かる。しかし、この発明から外れた比較Ｎｉ基合金板１〜２３は耐摩耗性および耐食性のうち少なくとも１つの特性が劣っているので好ましくないことが分かる。 From the results shown in Tables 1 to 4, the Ni-based alloy plates 1 to 23 of the present invention are superior in wear resistance since the specific wear rate is lower than that of the conventional Ni-based alloy plates 1 to 3, and the pores It can be seen that the corrosion resistance is excellent because there is no occurrence of food. However, it can be seen that the comparative Ni-base alloy plates 1 to 23 that deviate from the present invention are not preferable because at least one of the wear resistance and the corrosion resistance is inferior.
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