JP2621413B2 - Pitting-resistant Ni-base alloy with excellent bending workability - Google Patents
Pitting-resistant Ni-base alloy with excellent bending workabilityInfo
- Publication number
- JP2621413B2 JP2621413B2 JP22775688A JP22775688A JP2621413B2 JP 2621413 B2 JP2621413 B2 JP 2621413B2 JP 22775688 A JP22775688 A JP 22775688A JP 22775688 A JP22775688 A JP 22775688A JP 2621413 B2 JP2621413 B2 JP 2621413B2
- Authority
- JP
- Japan
- Prior art keywords
- bending workability
- pitting
- corrosion resistance
- resistant
- alloy
- 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、耐食性、特に耐孔食性に優れ、さらに加
工性、特に曲げ加工性に優れたNi基合金に関するもので
ある。Description: TECHNICAL FIELD The present invention relates to a Ni-based alloy having excellent corrosion resistance, especially excellent pitting corrosion resistance, and further excellent workability, particularly excellent bending workability.
一般に、化学プラント、電気メツキ装置、半導体装
置、食品加工装置、医療器具、海水にさらされる各種刃
物や手工具などは、耐食性に優れたNi基合金でつくられ
ている。Generally, chemical plants, electric plating equipment, semiconductor equipment, food processing equipment, medical equipment, various cutting tools and hand tools exposed to seawater are made of Ni-based alloys having excellent corrosion resistance.
これら耐食性に優れたNi基合金は、例えば、特開昭57
-43951号公報、特開昭58-204145号公報、特開昭62-4033
8号公報、特開昭62-158844号公報にも記載されており、
そのほかにも各種の耐食性に優れたNi基合金が提供され
ている。These Ni-based alloys having excellent corrosion resistance are disclosed in, for example,
-43951, JP-A-58-204145, JP-A-62-4033
No. 8, published in JP-A-62-158844,
In addition, various Ni-based alloys having excellent corrosion resistance are provided.
しかし、近年、上記耐食性に優れたNi基合金が使用さ
れる環境はますます厳しさを増し、さらにその環境下で
使用される機器の形状も複雑なものが要求されるように
なつてきた。However, in recent years, the environment in which the Ni-based alloy having excellent corrosion resistance is used has become increasingly severe, and the shape of equipment used in the environment has been required to be complicated.
これら要求にたいして、新しい各種Ni基合金が開発さ
れ提供されているが、従来のNi基合金は、耐孔食性に劣
るか、または加工性、特に曲げ加工性におとるために、
複雑形状加工に対する要求を満たすことが困難であつ
た。To meet these demands, various new Ni-based alloys have been developed and provided.Conventional Ni-based alloys have inferior pitting corrosion resistance or workability, especially bending workability.
It has been difficult to satisfy the requirements for complex shape processing.
たとえば、上記従来の技術で示した、特開昭57-43951
号公報および特開昭58-204145号公報に記載のNi基合金
は、曲げ加工性は良いが耐孔食性に劣り、一方、特開昭
62-40338号公報および特開昭62-158844号公報に記載のN
i基合金は、耐孔食性にすぐれているものの曲げ加工性
に劣り、耐孔食性および曲げ加工性の両方に優れたNi基
合金の出現が望まれていた。For example, as shown in the above-mentioned prior art,
And the Ni-based alloys described in JP-A-58-204145 have good bending workability but poor pitting corrosion resistance.
62-40338 JP and JP 62-158844 JP
The i-base alloy is excellent in pitting corrosion resistance, but is inferior in bending workability, and the appearance of a Ni-based alloy excellent in both pitting corrosion resistance and bending workability has been desired.
そこで、本発明者等は、上述の観点から、すぐれた耐
孔食性を有し、かつ通常の加工法で複雑形状に加工する
ことのできるNi基合金を開発すべく研究を行つた結果、 重量％（以下、％は重量％を示す）、 Cr:23〜27％、 Mo:10〜15％、 W:6〜14％、 ただし、 Fe:0.3〜2.3％、 C:0.009％以下、 を含有し、さらに必要に応じて （ａ）Nb、Ta、Zr、およびHfのうち１種または２種以
上:0.1〜３％、 （ｂ）Ｙを含む希土類元素、MgおよびCaのうち１種また
は２種以上:0.001〜0.005％、（ａ）および（ｂ）のう
ち１種または２種を含有し、残りがNiと不可避不純物か
らなる組成を有するNi基合金は、すぐれた耐孔食性と十
分な加工性、特に曲げ加工性を有するようになるという
知見を得たのである。In view of the above, the present inventors have conducted research to develop a Ni-based alloy having excellent pitting corrosion resistance and capable of being processed into a complex shape by a normal processing method. % (% Indicates weight%), Cr: 23 to 27%, Mo: 10 to 15%, W: 6 to 14%, Fe: 0.3 to 2.3%, C: 0.009% or less, and if necessary, (a) one or more of Nb, Ta, Zr, and Hf: 0.1 to 3%, (b) Rare earth element containing Y, one or more of Mg and Ca: 0.001 to 0.005%, containing one or two of (a) and (b), and the balance consisting of Ni and unavoidable impurities It has been found that Ni-based alloys having excellent pitting corrosion resistance and sufficient workability, particularly bending workability, are obtained.
この発明は、かかる知見にもとづいてなされたもので
あつて、以下に、成分組成を上記の通りに限定した理由
を説明する。The present invention has been made based on such findings, and the reason for limiting the component composition as described above will be described below.
（ａ）Cr Cr成分には、素地に固溶してこの塩素イオンを含む環
境下において耐孔食性を向上させる作用があるが、その
含有量が23％未満では所望の効果が得られず、一方27％
を越えると後述するMoおよびＷと金属間化合物を形成
し、曲げ加工性が低下することから、その含有量を23〜
27％と定めた。(A) Cr The Cr component has a function of improving the pitting corrosion resistance in an environment containing this chlorine ion by forming a solid solution in the base material, but if its content is less than 23%, the desired effect cannot be obtained. 27%
When Mo exceeds W, an intermetallic compound is formed with Mo and W described below, and the bending workability is reduced.
27%.
（ｂ）MoおよびＷ これらの成分には、素地に固溶してこれの塩素イオン
を含む環境に対する耐孔食性を向上させる作用がある
が、その含有量がMoおよびＷのいずれかでもMo:10％未
満、W:6％未満にしてMoとＷの合量 が14％未満の場合には所望の効果が得られず、一方Moお
よびＷのいずれかでもMo:15％、W:14％を越えても、ま
たこれら両者の合量 が18％を越えても、前述したCrと金属間化合物を形成
し、曲げ加工性が低下することからその含有量をMo:10
〜15％、W:6〜14％にして 前述したCrと合わせて と定めた。(B) Mo and W These components have the effect of forming a solid solution in the base material to improve the pitting corrosion resistance to an environment containing chloride ions, and even if the content of either Mo or W is Mo: Less than 10%, W: less than 6%, combined amount of Mo and W Is less than 14%, the desired effect cannot be obtained. On the other hand, when either Mo or W exceeds Mo: 15% or W: 14%, Exceeds 18%, the above-mentioned Cr and intermetallic compounds are formed, and the bending workability is reduced.
~ 15%, W: 6 ~ 14% Together with Cr mentioned above It was decided.
（ｃ）Fe Fe成分の含有量が2.3％を越えると耐孔食性および曲
げ加工性を低下せしめることから３％以下の含有にしな
ければならないが、0.3％未満にすることは溶解原料を
厳選する必要があり、コストアツプにつながることか
ら、その含有量を0.3〜2.3％と定めた。(C) Fe If the content of the Fe component exceeds 2.3%, the pitting corrosion resistance and bending workability are reduced, so the content must be 3% or less. Since it is necessary and leads to cost increase, its content is determined to be 0.3 to 2.3%.
（ｄ）Ｃ Ｃ成分の含有量が0.009％を越えると、粒界および粒
内に炭化物量が増加し、合金の耐孔食性および曲げ加工
性を劣化させることから、その含有量を0.009％以下と
定めた。(D) CC If the content of the C component exceeds 0.009%, the amount of carbides increases in the grain boundaries and in the grains, thereby deteriorating the pitting corrosion resistance and bending workability of the alloy. It was decided.
（ｅ）Nb、Ta、Zr、およびHf これらの成分には、合金の耐孔食性および曲げ加工性
を一段と改善させる作用があるので、特により一層の耐
孔食性および曲げ加工性が要求される場合に必要に応じ
て含有されるが、その含有量が0.1％未満では所望の効
果を得ることができず、一方３％を越えて含有させて
も、より一層の効果の向上はみられないのでその含有量
を0.1〜３％と定めた。(E) Nb, Ta, Zr, and Hf These components have an effect of further improving the pitting corrosion resistance and bending workability of the alloy, so that even more pitting corrosion resistance and bending workability are required. In some cases, it is contained as needed, but if the content is less than 0.1%, the desired effect cannot be obtained. On the other hand, if the content exceeds 3%, no further improvement in the effect is observed. Therefore, its content was determined to be 0.1 to 3%.
（ｆ）希土類元素、Ｙ、MgおよびCa これらの成分には、合金溶製時に脱酸や脱硫効果を向
上させる作用があるが、その含有量が0.001％未満では
所望の効果を得ることができず、一方その含有量が0.00
5％を越えると脆化して曲げ加工時に割れが発生し易く
なることから、その含有量を0.001〜0.005％と定めた。(F) Rare earth elements, Y, Mg, and Ca These components have the effect of improving the deoxidizing and desulfurizing effects during alloy smelting. If the content is less than 0.001%, desired effects can be obtained. But the content is 0.00
If it exceeds 5%, the content becomes 0.001 to 0.005%, since the material becomes brittle and cracks easily occur during bending.
（ｇ）不可避不純物 なお、この発明のNi-Cr-Mo系合金には、その他の不可
避不純物としてMn:0.3％以下、Ti:0.3％以下、Al:0.3％
以下を含有することがあるが、これら不可避不純物の含
有量が上記範囲内であれば、合金特性が何らそこなわれ
るものではない。(G) Inevitable impurities In the Ni-Cr-Mo alloy of the present invention, Mn: 0.3% or less, Ti: 0.3% or less, Al: 0.3%
The following may be contained, but as long as the content of these unavoidable impurities is within the above range, alloy characteristics are not impaired at all.
つぎに、この発明の合金を実施例により具体的に説明
する。Next, the alloy of the present invention will be specifically described with reference to examples.
通常の高周波溶解炉を用い、Ar雰囲気中で所定組成の
合金溶湯を調製した後、金型に鋳造して直径:60mm×長
さ:200mmのインゴツトとし、ついでこのインゴツトをエ
レクトロスラグ溶解装置を用いて再溶解して、それぞれ
第１表に示される成分組成を有する直径:100mmのインゴ
ツトとし、このインゴツトに、それぞれ1150〜1250℃の
範囲内の所定温度に10時間保持の条件で均質化処理を施
した後、同じく1150〜1250℃の範囲内の所定の熱間加工
開始温度にて熱間鍛造と熱間圧延を施して厚さ:4mmの熱
延板とし、この熱延板に、1100〜1200℃の範囲内の所定
温度に30分間保持の条件で均質化処理を施した後、冷間
圧延を施して板厚:2mmの冷延板とし、この冷延板に再び
1100〜1200℃の範囲内の所定温度に30分間保持の条件で
均質化処理を施すことによつて、本発明合金板材１〜18
および比較合金板１〜10をそれぞれ製造した。Using a normal high-frequency melting furnace, an alloy melt having a predetermined composition is prepared in an Ar atmosphere, and then cast into a mold to form an ingot having a diameter of 60 mm and a length of 200 mm, and then using an electroslag melting apparatus. And re-dissolved into ingots having the component compositions shown in Table 1 and having a diameter of 100 mm, and subjected to homogenization treatment at a predetermined temperature in the range of 1150 to 1250 ° C. for 10 hours. After applying, the same hot forging and hot rolling at a predetermined hot working start temperature in the range of 1150 ~ 1250 ° C. to give a hot-rolled sheet having a thickness of 4 mm, this hot-rolled sheet, 1100 ~ After performing homogenization treatment at a predetermined temperature within the range of 1200 ° C. for 30 minutes, cold rolling is performed to form a cold-rolled sheet having a thickness of 2 mm, and the cold-rolled sheet is re-rolled.
By performing homogenization treatment at a predetermined temperature in the range of 1100 to 1200 ° C. for 30 minutes, the alloy sheets 1 to 18 of the present invention are treated.
And comparative alloy plates 1 to 10 were produced.
なお、比較合金板１〜10は、いずれも構成成分のうち
のいずれかの成分含有量がこの発明の範囲から外れた組
成をもつもので、第１表において、この発明の範囲から
外れた組成に※印を付して示した。Each of the comparative alloy plates 1 to 10 has a composition in which the content of any one of the constituent components is out of the range of the present invention. Are marked with *.
この結果得られた本発明合金板１〜18および比較合金
板１〜10について、成形加工性、特に曲げ加工性を評価
する目的で、常温引張伸びを測定すると共に、JIS規格
にもとづいて180℃密着曲げ試験を行ない、曲げ部に割
れが発生する曲げ角度を測定した。For the alloy plates 1 to 18 of the present invention and the comparative alloy plates 1 to 10 obtained as a result, the room-temperature tensile elongation was measured at 180 ° C. based on the JIS standard for the purpose of evaluating the formability, particularly the bending workability. A contact bending test was performed to measure a bending angle at which a crack occurred in a bent portion.
上記JIS規格にもとづく180°密着曲げ試験の密着曲げ
が完了する前に割れが発生した場合、その割れが発生し
た角度を測定し、上記密着曲げが完了しても割れが発生
しなかつたものを「割れなし」としてそれらの結果を第
１表に示した。If cracking occurs before the close bending of the 180 ° close bending test based on the above JIS standard is completed, measure the angle at which the crack occurred, and determine that the crack did not occur even after the close bending was completed. The results are shown in Table 1 as "no crack".
さらに、耐孔食性を評価する目的で、たて:15mm×横:
25mm×厚さ:3mmの寸法を有する試験片を作製し、この試
験片を、 H2So4:7容量％、 HCl:3容量％、 CuCl2:1重量％、 FeCl3:1重量％、 を含有する沸騰水溶液中に240時間浸漬したのち試験片
表面の孔食の有無を実体顕微鏡（倍率40）で観察し、そ
れらの結果を第１表に示した。Furthermore, for the purpose of evaluating pitting corrosion resistance, vertical: 15 mm × horizontal:
A test piece having a size of 25 mm × thickness: 3 mm was prepared, and this test piece was subjected to H 2 So 4 : 7% by volume, HCl: 3% by volume, CuCl 2 : 1% by weight, After being immersed in a boiling aqueous solution containing FeCl 3 : 1% by weight for 240 hours, the presence or absence of pitting corrosion on the surface of the test piece was observed with a stereoscopic microscope (magnification: 40), and the results are shown in Table 1.
第１表に示される結果から、本発明合金板材１〜18
は、いずれも耐孔食性を示し、かつすぐれた曲げ加工性
を示すのに対して、比較合金板材１〜10にみられるよう
に、構成成分のうちのいずれかの成分含有量でもこの発
明の範囲から外れると、耐孔食性および曲げ加工性のう
ちの少なくともいずれかの性質が劣つたものになること
が明らかである。From the results shown in Table 1, the alloy sheets of the present invention 1 to 18
All show pitting corrosion resistance and excellent bending workability, whereas, as seen in the comparative alloy sheet materials 1 to 10, the content of any one of the constituent components of the present invention It is clear that out of the range, at least one of the pitting corrosion resistance and the bending property becomes inferior.
上述のように、この発明のNi-Cr-Mo系合金は、耐孔食
性のほかに、すぐれた曲げ加工性を具備するので、特に
塩素イオンを含む腐食液にされされる部分の複雑形状を
必要とする構造部材として用いることにより産業上優れ
た効果を発揮するものである。As described above, the Ni-Cr-Mo alloy of the present invention has excellent bending workability in addition to pitting corrosion resistance. By using it as a necessary structural member, an industrially superior effect is exhibited.
Claims (4)
重量％）を有することを特徴とする曲げ加工性にすぐれ
た耐孔食性Ni基合金。(1) Cr: 23 to 27%, Mo: 10 to 15%, W: 6 to 14%, Fe: 0.3 to 2.3%, C: 0.009% or less, with the balance being Ni and inevitable impurities (more than weight%), a pitting-resistant Ni-based alloy with excellent bending workability. .
％、を含有し、残りがNiと不可避不純物からなる組成
（以上重量％）を有することを特徴とする曲げ加工性に
すぐれた耐孔食性Ni基合金。2. Cr: 23-27%, Mo: 10-15%, W: 6-14%, Fe: 0.3 to 2.3%, C: 0.009% or less, and one or more of Nb, Ta, Zr and Hf: 0.1 to 3
Pitting corrosion-resistant Ni-base alloy with excellent bending workability, characterized by having a composition (more than weight%) consisting of Ni and unavoidable impurities.
以上:0.001〜0.005％、 を含有し、残りがNiと不可避不純物からなる組成（以上
重量％）を有することを特徴とする曲げ加工性にすぐれ
た耐孔食性Ni基合金。3. Cr: 23-27%, Mo: 10-15%, W: 6-14%, Fe: 0.3 to 2.3%, C: 0.009% or less, and further contains one or more of rare earth elements including Y, Mg and Ca: 0.001 to 0.005%, and the remainder is Ni and A pitting-resistant Ni-based alloy with excellent bending workability, characterized by having a composition (more than weight%) consisting of unavoidable impurities.
％、 Ｙを含む希土類元素、MgおよびCaのうち１種または２種
以上:0.001〜0.005％、 を含有し、残りがNiと不可避不純物からなる組成（以上
重量％）を有することを特徴とする曲げ加工性にすぐれ
た耐孔食性Ni基合金。4. Cr: 23-27%, Mo: 10-15%, W: 6-14%, Fe: 0.3 to 2.3%, C: 0.009% or less, and one or more of Nb, Ta, Zi and Hf: 0.1 to 3
%, One or more of Mg and Ca: 0.001 to 0.005%, and the balance has a composition of Ni and unavoidable impurities (more than% by weight). Pitting corrosion resistant Ni-based alloy with excellent bending workability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22775688A JP2621413B2 (en) | 1988-09-12 | 1988-09-12 | Pitting-resistant Ni-base alloy with excellent bending workability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22775688A JP2621413B2 (en) | 1988-09-12 | 1988-09-12 | Pitting-resistant Ni-base alloy with excellent bending workability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0277539A JPH0277539A (en) | 1990-03-16 |
| JP2621413B2 true JP2621413B2 (en) | 1997-06-18 |
Family
ID=16865883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22775688A Expired - Lifetime JP2621413B2 (en) | 1988-09-12 | 1988-09-12 | Pitting-resistant Ni-base alloy with excellent bending workability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2621413B2 (en) |
-
1988
- 1988-09-12 JP JP22775688A patent/JP2621413B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0277539A (en) | 1990-03-16 |
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