JPS60174868A - Carburization resistant member for fbr - Google Patents
Carburization resistant member for fbrInfo
- Publication number
- JPS60174868A JPS60174868A JP2870384A JP2870384A JPS60174868A JP S60174868 A JPS60174868 A JP S60174868A JP 2870384 A JP2870384 A JP 2870384A JP 2870384 A JP2870384 A JP 2870384A JP S60174868 A JPS60174868 A JP S60174868A
- Authority
- JP
- Japan
- Prior art keywords
- carburization
- fbr
- heat exchanger
- present
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/04—Treatment of selected surface areas, e.g. using masks
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
【発明の詳細な説明】
〔本発明の技術分野〕
本発明は、主としてＦＢＲ用中間中間熱換器熱管材料に
使用するＦＢＲ用耐浸炭性部材に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a carburization-resistant member for an FBR, which is mainly used as a heat tube material for an intermediate heat exchanger for an FBR.
ＬＭＦＢＲ（Ｌｉｑｕｉｄ Ｍｅｔａｌ例えば）ｉａ等
を冷媒として用いるＦＢＲ）用構造材料では、オーステ
ナイト系ステンレス鋼および２ ｙｉＯｒ−ＩＭｏ 鋼
が使用される。Austenitic stainless steel and 2 yiOr-IMo steel are used as structural materials for LMFBR (Liquid Metal, for example, FBR that uses ia, etc., as a refrigerant).
その際、高温流動Ｎａにより同−Ｎａ流体系にある２％
Ｏｒ−ＩＭｏ 鋼とオーステナイト系ステンレス鋼の間
でＣの活量差に基づくＣのやりとりが生じ（活量が大き
い万から活量が低い方へＣが拡散する）、結果的Ｋ ２
％ Ｏｒ−ＩＭｏ 鋼からオーステナイト系ステンレ
ス鋼に０が流れる。At that time, 2% of the amount in the same -Na fluid system due to the high temperature fluid Na
An exchange of C occurs between Or-IMo steel and austenitic stainless steel based on the difference in C activity (C diffuses from the higher activity to the lower activity), resulting in K 2
% Or-IMo 0 flows from steel to austenitic stainless steel.
すなわち、２ＸＯｒ−ＩＭｏ 銅では脱炭し、オーステ
ナイト系ステンレス鋼では浸炭が生じ、鋼材の機械的性
質が変化する。特に、中間熱交換器伝熱管では５ＵＥ３
５０４ステンレス銅が用いられ、１．２１１１ＩＩとい
う薄肉のため、浸炭による延性の低下、脆化が設計上重
要な間勉となっている。That is, decarburization occurs in 2XOr-IMo copper, carburization occurs in austenitic stainless steel, and the mechanical properties of the steel material change. In particular, for intermediate heat exchanger heat transfer tubes, 5UE3
504 stainless copper is used, and due to the thin wall of 1.2111II, the reduction in ductility and embrittlement due to carburization is an important design consideration.
現在、第１図に示すようなＦＢＲ用中間中間熱交換器１
熱管２材として牙−ステナイト系ステンレス鋼が考えら
れ、それは通常脱スケール処理された状態で用いられる
。しかし、この表面処理を施すと、表面は粒界腐食を生
じるため浸炭現象が顕著となり、この浸炭による延性の
低下及び脆化が生ずる欠点を有する。Currently, an intermediate intermediate heat exchanger 1 for FBR as shown in Fig.
Fang-stenite stainless steel is considered as the material for the heat tube 2, and is usually used in a descaled state. However, when this surface treatment is applied, intergranular corrosion occurs on the surface, resulting in a noticeable carburization phenomenon, and this carburization has the disadvantage of reducing ductility and causing embrittlement.
そこで本発明者は脱スケール処理を施さないオーステナ
イト系ステンレス鋼伝熱管を用いたところ、ナトリウム
中での浸炭が低減することを見出し、本発明を完成した
ものである。すなわち、本発明の目的は、オーステナイ
ト系ステンレス鋼や高Ｏｒ 鋼の浸炭現象を抑制し、浸
炭にする鋼材の機械的性質への影響を軽減するＦＢＲ用
耐浸炭性部材を提供するＫある。Therefore, the present inventor found that carburization in sodium was reduced by using an austenitic stainless steel heat exchanger tube that was not subjected to descaling treatment, and completed the present invention. That is, an object of the present invention is to provide a carburization-resistant member for FBR that suppresses the carburization phenomenon of austenitic stainless steel and high-Or steel and reduces the influence on the mechanical properties of the steel material to be carburized.
そして、本発明は、上記目的を達成する手段として、部
材の表面に酸化スケールを残したままにすること、換言
すれば該表面に対して脱スケール処理を施こさない点に
ある。すなわち、本発明は、表面の脱スケール処理を施
こさない部材からなることを特徴とするＦＢＲ用耐浸炭
性部材である。The present invention, as a means for achieving the above object, consists in leaving the oxide scale on the surface of the member, in other words, in not performing descaling treatment on the surface. That is, the present invention is a carburization-resistant member for FBR characterized by being made of a member whose surface is not subjected to descaling treatment.
本発明における部材としては、オーステナイト系ステン
レス鋼、高Ｏｒ鋼（例えば９〜１２Ｃｒ−１〜ＺＭｏ鋼
等）等が使用される。As the member in the present invention, austenitic stainless steel, high Or steel (for example, 9-12Cr-1-ZMo steel, etc.), etc. are used.
この部材表面の脱スケール処理を行わずに、すなわち部
材表面に酸化スケールを残したままで、例えば第１因に
示すＦＩＳＨ用中間熱中間熱交換器１管２材として使用
する。なお、中間熱交換器とは、第１図から明らかなよ
うに、１次系のＨａと２次系のＮａとを区画して、管２
の内側（１次系）の熱を管２の外側（２次系）に伝える
熱交換器である。This member is used without descaling the surface of the member, that is, with the oxidized scale remaining on the member surface, for example, as the 1-tube 2 material for the intermediate heat exchanger for FISH shown in the first factor. As is clear from FIG.
This is a heat exchanger that transfers the heat inside the tube 2 (primary system) to the outside of the tube 2 (secondary system).
次に、実施例により本発明を具体的忙説明する。Next, the present invention will be specifically explained using examples.
第２図は、本発明の実施例である非脱スケール処理の８
ＵＳ３０４ステンレス鋼〔スケールの厚さ数μｍ、酸化
物の種類（Ｆｅ−ｃ ｒ ） ２０５ｓ Ｆｅ ｓ ｏ
４等〕の浸炭プロファイルを、従来の脱スケール処理（
６０Ｃの硝酸とフッ酸の混酸で洗う）した同材料と比較
して示した図である。この図から明らかなように、本発
明の実施例である非脱スケール処理材では、表面炭素饋
度は従来の脱スケール処理材に比べやや高いか、浸炭深
さは非常に小さく、また浸炭量も小さくなっている。Figure 2 shows 8 of the non-descaling process which is an embodiment of the present invention.
US304 stainless steel [Scale thickness several μm, oxide type (Fe-cr) 205s Feso
4 grade] carburizing profile was subjected to conventional descaling treatment (
FIG. 3 is a diagram showing a comparison with the same material washed with a mixed acid of 60C nitric acid and hydrofluoric acid. As is clear from this figure, in the non-descaled material that is an example of the present invention, the surface carbon enrichment is slightly higher than that of the conventional descaled material, the carburization depth is very small, and the amount of carburization is is also smaller.
本発明は、以上詳記したように、脱スケール処理を施こ
さない部劇、すなわち、表面に酸化スケールを残存する
部材からなるものであるから、浸炭現象が抑制でき、浸
炭による鋼材の機械的性質、例えば延性低下及び脆化な
どへの影響が軽減できる効果が生ずるものである＠As described in detail above, the present invention is made of parts that are not subjected to descaling treatment, that is, members that have oxidized scale remaining on their surfaces, so carburization phenomenon can be suppressed, and the mechanical damage of steel materials due to carburization can be suppressed. It has the effect of reducing the effects on properties, such as reduced ductility and embrittlement.
第１図は、ＦＢＲ用中間中間熱交換器明するための図、
第２図は、本発明の実施例である非脱スケール処理の１
３ＵＳ５０４ステンレス鋼の浸炭プロファイルを、従来
の脱スケール処理した同材料のそれと比較して示した図
である。
復代理人 内 １） 明
復代理人 萩 原 亮 −
尾１図
も２図
Ｎａ浸漬表面かうの距離（、ａｍ）Figure 1 is a diagram to clarify the intermediate heat exchanger for FBR,
FIG. 2 shows one example of non-descaling processing, which is an embodiment of the present invention.
FIG. 3 is a diagram showing the carburization profile of 3US504 stainless steel compared to that of the same material that has been conventionally descaled. Sub-agent 1) Meiji agent Ryo Hagiwara - Figure 1 and Figure 2 Na immersion surface distance (, am)
Claims (1)
特徴とするＦＢＲ用耐浸炭性部材。A carburization-resistant member for FBR, characterized by being made of a member whose surface is not subjected to descaling treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2870384A JPS60174868A (en) | 1984-02-20 | 1984-02-20 | Carburization resistant member for fbr |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2870384A JPS60174868A (en) | 1984-02-20 | 1984-02-20 | Carburization resistant member for fbr |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60174868A true JPS60174868A (en) | 1985-09-09 |
Family
ID=12255820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2870384A Pending JPS60174868A (en) | 1984-02-20 | 1984-02-20 | Carburization resistant member for fbr |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60174868A (en) |
-
1984
- 1984-02-20 JP JP2870384A patent/JPS60174868A/en active Pending
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