JPH0830248B2 - Stainless cast steel for seawater pumps at nuclear power plants - Google Patents
Stainless cast steel for seawater pumps at nuclear power plantsInfo
- Publication number
- JPH0830248B2 JPH0830248B2 JP5146703A JP14670393A JPH0830248B2 JP H0830248 B2 JPH0830248 B2 JP H0830248B2 JP 5146703 A JP5146703 A JP 5146703A JP 14670393 A JP14670393 A JP 14670393A JP H0830248 B2 JPH0830248 B2 JP H0830248B2
- Authority
- JP
- Japan
- Prior art keywords
- nuclear power
- evaluation
- corrosion resistance
- power plants
- cast steel
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
- Arc Welding In General (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は原子力発電所海水ポン
プ用ステンレス鋳鋼に関する。This invention relates to a seawater pump for a nuclear power plant.
About the cast stainless steel for-flops.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】現存す
る原子力発電所は海浜地区に設置され、冷却水として海
水を使用している。このとき使用されるポンプの材料
は、その環境下での耐食性に優れている必要があり、従
来そのための材料としてＳＵＳ３１６（鍛造材）や、表
１中のＡ１に示す如き組成を有するＳＣＳ１４（鋳造
材）若しくはＳＣＳ１３（鋳造材）が広く用いられてい
る。2. Description of the Related Art An existing nuclear power plant is installed in a beach area and uses seawater as cooling water. The material of the pump used at this time must be excellent in corrosion resistance under the environment, and as a material for that purpose, SUS316 (forged material) and SCS14 (casting) having a composition as shown in A1 in Table 1 have been conventionally used. Material) or SCS13 (cast material) is widely used.
【０００３】しかしながら滞留する海水中や干満帯，飛
沫部では孔食，隙間腐食が発生し易く、これに対して上
記材料は耐食性の面で信頼性が十分とは言い難い。この
ためより信頼性の高い材料が求められている。However, pitting corrosion and crevice corrosion are likely to occur in stagnant seawater, tidal zones, and splashed parts, and on the other hand, it is difficult to say that the above materials have sufficient corrosion resistance. Therefore, more reliable materials are required.
【０００４】そこで鍛造材については、Ｃｒ，Ｍｏ，Ｎ
等の耐食性向上成分を添加ないし高含量とした高耐食材
が近年開発され、実用化に到っている。Therefore, for forging materials, Cr, Mo, N
Highly resistant foods with added or high content of corrosion resistance improving components such as the above have been developed in recent years and have been put to practical use.
【０００５】しかしながら鋳造材の場合、鋳造性，溶接
性等の製造性を確保する必要があることから、これらを
満足しつつ十分満足できる耐食性を有するものが提供さ
れておらず、特に海水ポンプ等の大型鋳造品に関して
は、未だにＳＣＳ１４若しくはＳＣＳ１３が用いられて
いるのが殆どであるというのが実情である。However, in the case of a cast material, it is necessary to secure manufacturability such as castability and weldability. Therefore, there is not provided a material having sufficient corrosion resistance while satisfying these requirements, and particularly a seawater pump or the like. As for the large-scale cast products of SCS14 or SCS13, most of them are still used.
【０００６】[0006]
【課題を解決するための手段】本願の発明はこのような
事情を背景としてなされたもので、耐食性に優れ且つ鋳
造性，溶接性など製造性に優れた原子力発電所海水ポン
プ用ステンレス鋳鋼を提供することを目的とするもので
ある。The present invention SUMMARY OF THE INVENTION has been made of the above circumstances as the background, and the castability is excellent in corrosion resistance, weldability and manufacturing with excellent nuclear power plant seawater stainless cast steel for pump It is intended to be provided.
【０００７】而して本願の発明は、原子力発電所海水ポ
ンプ用ステンレス鋳鋼の組成を、重量基準でＣ：≦０．
０４０％，Ｓｉ：≦１．５０％，Ｍｎ：≦１．００％，
Ｐ：≦０．０４０％，Ｓ：≦０．０３０％，Ｎｉ：１
５．００〜２１．５０％，Ｃｒ：２２．００〜２６．０
０％，Ｍｏ：４．００〜６．００％，Ｎ：０．１０〜
０．２５％，残部実質的にＦｅから成り且つδ−フェラ
イトを１０ｖｏｌ％未満の範囲で含有したものとするこ
とを特徴とする。 [0007] Thus the present application of inventions, the nuclear power plant sea water port
The composition of the cast stainless steel for pumps is C: ≦ 0.
040%, Si: ≤ 1.50%, Mn: ≤ 1.00%,
P: ≤ 0.040%, S: ≤ 0.030%, Ni: 1
5.00 to 21.50%, Cr: 22.00 to 26.0
0%, Mo: 4.00 to 6.00%, N: 0.10
0.25%, balance substantially and Ri consists Fe .delta. Blow
Intended it characterized in that to those contained in the range of less than 10 vol%.
【０００８】以上のように本願の発明は材料組成，組織
の適正化を図り、以てＳＣＳ１４の良好な製造性を確保
しつつ、優れた耐食性、特に海水環境での耐食性を付与
し得たものである。As described above, the invention of the present application is capable of imparting excellent corrosion resistance, particularly corrosion resistance in seawater environment, while ensuring good manufacturability of SCS14 by optimizing the material composition and structure. Is.
【０００９】次に本発明における各成分及びδ−フェラ
イト量の限定理由を詳述する。 Ｃ：≦０．０４０％ Ｃは炭化物を形成し、耐食性，靭性を劣化させるため少
ない方が望ましく、本発明では上限値を０．０４０％と
する。Next, the reasons for limiting each component and the amount of δ-ferrite in the present invention will be described in detail. C: ≦ 0.040% C forms carbides and deteriorates corrosion resistance and toughness, so it is desirable that the amount is small. In the present invention, the upper limit is 0.040%.
【００１０】Ｓｉ：≦１．５０％ Ｓｉは脱酸剤として有効であり、また湯回り性を向上さ
せる効果がある。反面、金属間化合物を形成し、鋳造
時，溶接時の割れ感受性を増加させる。本発明では湯回
り性と割れ感受性のバランスを考慮し１．５０％以下を
含有させる。Si: ≦ 1.50% Si is effective as a deoxidizing agent and also has the effect of improving the hot running property. On the other hand, it forms intermetallic compounds and increases crack susceptibility during casting and welding. In the present invention, in consideration of the balance between bathing property and cracking susceptibility, the content of 1.50% or less is contained.
【００１１】Ｍｎ：≦１．００％ Ｍｎはオーステナイト形成元素として働く外、脱酸剤と
しても有効である。しかしながらＳと化合物（ＭｎＳ）
を形成し著しく耐食性を劣化させるので、この発明では
１．００％以下とする。Mn: ≦ 1.00% Mn acts as an austenite forming element and is also effective as a deoxidizing agent. However, S and compound (MnS)
Therefore, in the present invention, the content is made 1.00% or less .
【００１２】Ｐ：≦０．０４０％ Ｐは応力腐食割れを助長し、また耐食性を劣化させるた
め０．０４０％以下とする。望ましくは０．０２％以下
である。P: ≦ 0.040% P promotes stress corrosion cracking and deteriorates corrosion resistance, so P is 0.040% or less . Desirably 0.02% or less .
【００１３】Ｓ：≦０．０３０％ Ｓは耐食性を著しく劣化させるため０．０３０％以下と
する必要がある。望ましくは０．００５％以下である。S: ≤0.030% S significantly deteriorates the corrosion resistance, so it is necessary to set it to 0.030% or less . It is preferably 0.005% or less .
【００１４】Ｎｉ：１５．００〜２１．５０％ Ｎｉはオーステナイト形成元素として１５．００％以上
必要である。但し必要以上に含有させるとコスト上昇を
招くので、本発明では２１．５０％以下とする。Ni: 15.00 to 21.50% Ni is required to be 15.00% or more as an austenite forming element. However, if it is contained more than necessary, the cost increases, so in the present invention, it is set to 21.50% or less.
【００１５】Ｃｒ：２２．００〜２６．００％ Ｃｒは耐食性を向上させるために不可欠である。特に海
水環境での孔食，隙間腐食に対して有効であり、２２．
００％以上必要である。但し含量が多くなると金属間化
合物の形成を促進し、製造性を劣化させるため２６．０
０％以下とする。Cr: 22.00 to 26.00% Cr is indispensable for improving the corrosion resistance. Especially effective against pitting and crevice corrosion in seawater environment.
00% or more is required. However, if the content is high, the formation of intermetallic compounds is promoted and the manufacturability is deteriorated.
It is 0% or less.
【００１６】Ｍｏ：４．００〜６．００％ Ｍｏは耐食性（特に局部腐食に対する耐食性）を向上さ
せるのに不可欠であり、また強度を向上させる上でも効
果がある。これらのために本発明では４．００％以上含
有させる。但しＳｉと同様金属間化合物の形成を促進
し、製造性を劣化させるため６．００％以下とする必要
がある。Mo: 4.00 to 6.00% Mo is indispensable for improving corrosion resistance (particularly corrosion resistance against local corrosion), and is also effective for improving strength. Therefore, in the present invention, the content is 4.00% or more. However, like Si, it is necessary to set the content to 6.00% or less in order to promote the formation of intermetallic compounds and deteriorate the productivity.
【００１７】Ｎ：０．１０〜０．２５％ Ｎは耐食性の向上に有効であり、また強度の向上にも効
果があるとともにオーステナイト形成元素として有効で
あり、０．１０％以上含有させる。但し多量に添加する
と鋳造時にブローホールを形成し、製造性を劣化させる
ので０．２５％以下に限定する。N: 0.10 to 0.25% N is effective in improving the corrosion resistance, is also effective in improving the strength and is effective as an austenite forming element, and is contained in an amount of 0.10% or more. However, if added in a large amount, blowholes are formed during casting and the manufacturability is deteriorated, so the content is limited to 0.25% or less.
【００１８】δ−フェライト量：１０ｖｏｌ％未満 δ−フェライトは溶接時の割れを低減するのに有効であ
る。但しδ−フェライト相はσ相，χ相等の金属間化合
物相を形成し易く、多量の含有はそれらの形成を助長す
るため、１０ｖｏｌ％未満とする必要がある。またその
形態は、島状に存在することが望ましい。Δ-Ferrite amount: less than 10 vol% δ-ferrite is effective in reducing cracks during welding. However, the δ-ferrite phase easily forms an intermetallic compound phase such as a σ phase and a χ phase, and the inclusion of a large amount promotes their formation, so it is necessary to set it to less than 10 vol%. Moreover, it is desirable that the form exists in an island shape.
【００１９】[0019]
【実施例】次に本発明の特徴を更に明確にすべく、以下
にその実施例を詳述する。 ［１．供試体の製造］ 表１に示す各種組成においてＪＩＳ Ａ号舟型試験
片，外径３５０ｍｍ，単体重量２５ｋｇのクローズド
型インペラ，外径１５００ｍｍ，単体重量６００ｋｇ
のオープン型インペラを鋳造して供試体とした。EXAMPLES In order to further clarify the characteristics of the present invention, examples thereof will be described in detail below. [1. Manufacture of Specimens] JIS A boat-shaped test pieces with various compositions shown in Table 1, an outer diameter of 350 mm, a closed type impeller with a unit weight of 25 kg, an outer diameter of 1500 mm, and a unit weight of 600 kg
The open type impeller was cast into a specimen.
【００２０】尚、の供試体の最大肉厚は３０ｍｍであ
り、の供試体は１５０ｍｍである。The maximum thickness of the test piece is 30 mm, and the maximum thickness of the test piece is 150 mm.
【００２１】［２．評価試験］ ＣＰＴ ｐＨ１に調整した温度２０℃の６％ＦｅＣｌ3溶液中に
供試体を２４時間浸漬し、腐食の発生がない場合には
２．５℃ずつ温度を上げて同様の操作を行い、腐食の発
生しない限界の温度、即ち臨界孔食発生温度を調べた。[2. Evaluation test] The specimen was immersed in a 6% FeCl 3 solution at a temperature of 20 ° C. adjusted to CPT pH 1 for 24 hours, and when corrosion did not occur, the temperature was raised by 2.5 ° C. and the same operation was performed. The critical temperature at which corrosion does not occur, that is, the critical pitting corrosion temperature was investigated.
【００２２】ＣＣＴ マルチクレビスにて隙間を形成した供試体をｐＨ１に調
整した温度２０℃の３％ＦｅＣｌ3溶液中に２４時間浸
漬してと同様の動作を繰返し行い、腐食の発生しない
限界温度、即ち臨界隙間腐食発生温度を調べた。The same operation was repeated by immersing the specimen in which a gap was formed by CCT multi-clevis in a 3% FeCl 3 solution adjusted to pH 1 and having a temperature of 20 ° C. for 24 hours. That is, the critical crevice corrosion temperature was investigated.
【００２３】製造性評価 製造性は鋳造性，溶接性を調べることにより評価した。
それらの製造性評価は以下のようにして行った。 （イ）供試体の場合 （ａ）鋳造性評価 鋳造後に固溶化熱処理し、湯回り，ブローホール，割れ
を評価した。 （ｂ）溶接性評価 板厚５〜１２ｍｍの部分を以下の条件で溶接（ビードオ
ンプレート）して割れを評価した。 ・溶接条件 溶接棒としてインコネル６２５（但しＡ１についてはＳ
ＵＳ３０９）を用いてＴＩＧ溶接を行った。入熱量は１
１〜１５ＫＪ／ｃｍとした。Manufacturability Evaluation Manufacturability was evaluated by examining castability and weldability.
The evaluation of their manufacturability was performed as follows. (A) Specimen (a) Castability evaluation After casting, solution heat treatment was carried out to evaluate molten metal, blowholes and cracks. (B) Weldability evaluation A portion having a plate thickness of 5 to 12 mm was welded (bead-on-plate) under the following conditions to evaluate cracking. -Welding conditions Inconel 625 as a welding rod (however, for A1, S
US 309) was used for TIG welding. Heat input is 1
It was set to 1 to 15 KJ / cm.
【００２４】以上の試験で、（ａ），（ｂ）とも良好な
ものは製造性評価をＡとし、（ａ）のみ良好（ｂ）は不
良のものについては評価をＢとし、（ａ）が不良のもの
については評価をＣとした。In the above-mentioned tests, a good manufacturability evaluation is given as (a) and (b), a good manufacturability evaluation is given as (a), and a bad product is given as (b) and B is given as (a). For the defective ones, the evaluation was C.
【００２５】（ロ）供試体の場合 （ａ）鋳造性評価 上記（イ）（ａ）と同様である。 （ｂ）溶接性評価 板厚１０ｍｍの部分を上記（イ）（ｂ）と同様の条件で
溶接して同様の評価を行った。(B) In the case of test piece (a) Evaluation of castability The same as (a) and (a) above. (B) Weldability evaluation A portion having a plate thickness of 10 mm was welded under the same conditions as in (a) and (b) above, and the same evaluation was performed.
【００２６】これらの結果、（ａ）の鋳造試験でその欠
陥が補修可能な範囲であり且つ（ｂ）の試験で割れが無
かった場合には評価をＡとし、欠陥が補修可能であって
（ｂ）の試験で割れが生じたものは評価をＢとし、更に
（ａ）の試験で生じた欠陥が補修不能であって溶接時に
割れの生じたものは評価をＣとした。これらの試験の結
果が表１に併せて示してある。As a result, when the defect is repairable in the casting test of (a) and there is no crack in the test of (b), the evaluation is A, and the defect can be repaired ( When the crack was generated in the test of b), the evaluation was B, and when the defect generated in the test of (a) was unrepairable and the crack was generated during welding, the evaluation was C. The results of these tests are also shown in Table 1.
【００２７】[0027]
【表１】[Table 1]
【００２８】表１の結果から、本発明例のものは耐食
性，製造性とも良好であることが分かる。From the results shown in Table 1, it can be seen that the examples of the present invention have good corrosion resistance and manufacturability.
【００２９】以上本発明の実施例を詳述したがこれはあ
くまで一例示であり、本発明はその主旨を逸脱しない範
囲において、当業者の知識に基づき様々な変更を加えた
態様で実施可能である。The embodiment of the present invention has been described in detail above, but this is merely an example, and the present invention can be implemented in variously modified forms based on the knowledge of those skilled in the art without departing from the spirit of the invention. is there.
Claims (1)
ｏｌ％未満の範囲で含有していることを特徴とする原子
力発電所海水ポンプ用ステンレス鋳鋼。1. C: ≤ 0.040% Si: ≤ 1.50% Mn: ≤ 1.00% P: ≤ 0.040% S: ≤ 0.030% Ni: 15.00-21 by weight .50% Cr: 22.00 to 26.00% Mo: 4.00 to 6.00% N: 0.10 to 0.25% The balance consists essentially of Fe and 10v of δ-ferrite.
A cast stainless steel for an atomic power station seawater pump , characterized in that it is contained in a range of less than ol% .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5146703A JPH0830248B2 (en) | 1993-05-27 | 1993-05-27 | Stainless cast steel for seawater pumps at nuclear power plants |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5146703A JPH0830248B2 (en) | 1993-05-27 | 1993-05-27 | Stainless cast steel for seawater pumps at nuclear power plants |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06336653A JPH06336653A (en) | 1994-12-06 |
| JPH0830248B2 true JPH0830248B2 (en) | 1996-03-27 |
Family
ID=15413643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5146703A Expired - Lifetime JPH0830248B2 (en) | 1993-05-27 | 1993-05-27 | Stainless cast steel for seawater pumps at nuclear power plants |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0830248B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140056751A1 (en) * | 2011-03-31 | 2014-02-27 | Kubota Corporation | Cast austenitic stainless steel |
-
1993
- 1993-05-27 JP JP5146703A patent/JPH0830248B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06336653A (en) | 1994-12-06 |
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| Date | Code | Title | Description |
|---|---|---|---|
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