JPS58151456A - Ferritic stainless steel - Google Patents
Ferritic stainless steelInfo
- Publication number
- JPS58151456A JPS58151456A JP3254082A JP3254082A JPS58151456A JP S58151456 A JPS58151456 A JP S58151456A JP 3254082 A JP3254082 A JP 3254082A JP 3254082 A JP3254082 A JP 3254082A JP S58151456 A JPS58151456 A JP S58151456A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- ferritic stainless
- steel
- embrittlement
- stress corrosion
- 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
Abstract
Description
【発明の詳細な説明】
本発明は、従来のフェライト系ステンレス鋼の粒界腐食
性、応力腐食割れ感受性等を向上させた改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of conventional ferritic stainless steel in terms of intergranular corrosion, stress corrosion cracking susceptibility, etc.
火力、原子力及び化学プラント等の機器において、耐食
性や高温強度等を必要とする配管。Piping that requires corrosion resistance and high-temperature strength in equipment for thermal power, nuclear power, chemical plants, etc.
チューブ、管板及び容器等の材料として、また塩化物等
による耐応力腐食割れ性が優れる材料としてフェライト
系ステンレス鋼がある。Ferritic stainless steel is used as a material for tubes, tube sheets, containers, etc., and as a material that has excellent stress corrosion cracking resistance due to chlorides and the like.
従来のフェライト系ステンレス鋼としては。As conventional ferritic stainless steel.
１２％Ｏｒ、、１８％Ｏｒ、２５％Ｏｒ系等のステンレ
ス鋼があるが（％は重量％を示す。）、約２０％Ｏｒ以
上になると４７５１Ｓ脆化を生じ易いため、高温（約８
００℃〜６００℃）での使用がむずかしかった。There are stainless steels such as 12% Or, 18% Or, and 25% Or (% indicates weight %), but if the concentration exceeds about 20% Or, 4751S embrittlement tends to occur, so it cannot be used at high temperatures (about 8
It was difficult to use the product at temperatures between 00°C and 600°C.
そこで、高温での使用脆化を少なくするにはＣｒ量を減
少させることが有効であるため、耐食性が優れ、かつＣ
ｒＪｉｌが最も少ない１２％Ｏｒ （１１〜１４％Ｏｒ
）ステンレス鋼が注目される。Therefore, it is effective to reduce the amount of Cr in order to reduce embrittlement during use at high temperatures.
12%Or (11~14%Or
) Stainless steel is attracting attention.
しかし、従来の１２％Ｏｒ鋼はＣ量が高いため溶接部が
硬化し易く、溶接部はマルテンサイトが生成して溶接部
の延性、じん性が劣化していた。また、低０．Ｎの１２
％Ｃ「鋼でも溶接部のように高温に加熱されると１粒界
腐食性、応力腐食割れ感受性が低下していた。However, since the conventional 12% Or steel has a high C content, the welded part is easily hardened, martensite is generated in the welded part, and the ductility and toughness of the welded part are deteriorated. Also, low 0. N's 12
%C Even in steel, when heated to high temperatures such as in welded areas, intergranular corrosion and stress corrosion cracking susceptibility decreased.
本発明は、上記に鑑み、従来の１〜２２２％Ｏｒ、９％
Ｏｒフェライト鋼や８０４，８１６等のオーステナイト
系ステンレス鋼など、火力。In view of the above, the present invention provides conventional 1 to 222%Or, 9%
Firepower, such as Or ferritic steel and austenitic stainless steel such as 804 and 816.
原子力、化学プラント用高温材料の代替材として、耐食
性２強度、コスト、溶接性の優れた材料の開発をはかっ
たもので、Ｃｉｒ：１１〜２０％。As an alternative to high-temperature materials for nuclear power and chemical plants, we have developed a material with excellent corrosion resistance, strength, cost, and weldability.Cir: 11-20%.
Ｍｏ ： １〜４％、Ｔｉ＋Ｎｂ≦０．７０％、Ｏ’＋
Ｎ≦０．０４％、及び残部がＦｅからなり、かつ（Ｔｉ
＋Ｎｂ）／（０＋Ｎ）≧１０となることを特徴とするフ
ェライト系ステンレス鋼を提供する。Mo: 1-4%, Ti+Nb≦0.70%, O'+
N≦0.04%, the balance is Fe, and (Ti
Provided is a ferritic stainless steel characterized in that +Nb)/(0+N)≧10.
ステンレス鋼とするもので（耐食性の点から１１％Ｏｒ
以上必要、コスト的に低いＯｒ量をねらった。）、さら
に粒界腐食性、応力腐食割れ感受性の低減のため、かつ
溶接性向−Ｅのため。Made of stainless steel (11% Or
We aimed for a low amount of Or in terms of cost. ), as well as to reduce intergranular corrosion and stress corrosion cracking susceptibility, and for weldability -E.
Ｔｉ、Ｎｂを添加し、（０＋Ｎ）量を下げてｃ十Ｎ≦Ｏ
，，０４’０％とし、かつ（Ｔｉ 十Ｎｂ ） ／（０
＋Ｎ）≧１０とする。またじん性劣化のため。Add Ti and Nb and lower the amount of (0+N) so that c1N≦O
,,04'0%, and (Ti 10Nb)/(0
+N)≧10. Also due to deterioration of toughness.
Ｔｉ十Ｎｂ≦０．７０％とし、４７５℃脆化等、脆化防
止の点から、１１〜２０％Ｏｒとし９強度を出来るだけ
上げ、かつ孔食性を良くするため。Ti+Nb≦0.70%, and from the viewpoint of preventing embrittlement such as embrittlement at 475° C., it should be 11 to 20% Or to increase the strength as much as possible and improve pitting corrosion.
Ｍｏを１〜４％添加したものである。It contains 1 to 4% of Mo.
以下さらに本発明のステンレス鋼を実施−１を参照して
詳細に説明する。Hereinafter, the stainless steel of the present invention will be further explained in detail with reference to Example 1.
本発明のステンレス鋼は、従来の１２％Ｏｒ鋼をベース
として、下記の成分規制および元素添加によって、性能
を改善したものである。即ち■ 基本成分系として１１
〜２０％Ｏｒ −Ｆｅ系フェライト・ステンレス鋼とす
る。The stainless steel of the present invention is based on the conventional 12% Or steel, and its performance is improved by controlling the components and adding elements as described below. That is,■ As a basic component system, 11
~20% Or -Fe based ferrite stainless steel.
これは、前述したように、耐食性の点からは１１％Ｏｒ
以上含有が必要であり、使用中脆化（例えば４７５℃脆
化、σ相脆化）を防止するにはＯｒ量を低くした方が良
いため、必要最小限の範囲とした。As mentioned above, from the viewpoint of corrosion resistance, this is 11% Or
The above content is necessary, and since it is better to lower the amount of Or in order to prevent embrittlement during use (for example, 475° C. embrittlement, σ phase embrittlement), it is set to the minimum necessary range.
■ 粒界腐食性、応力腐食割れ感受性の低減のためには
、第１図の実験結果に示すように。■ To reduce intergranular corrosion and stress corrosion cracking susceptibility, as shown in the experimental results in Figure 1.
粒界腐食試験（シュドラウス試験、７２１１浸漬）の結
果、ＴＩＧ溶接部の粒界腐食性、応力腐食割れ感受性を
下げるには、 Ｔｉ ＋Ｎｂ １０十Ｎ≧１０が必要で
ある。As a result of the intergranular corrosion test (Schdrauss test, 7211 immersion), Ti + Nb 100N≧10 is required to reduce intergranular corrosion and stress corrosion cracking susceptibility of TIG welds.
■ 溶接熱影響部はＣ十Ｎが多いと、第２図の実験結果
に示すように、マルテンサイトが生成して硬化し、脆（
なるため、ｃ十Ｎ≦０．０４％とする必要がある。■ If the weld heat affected zone contains a large amount of C0N, martensite will form, harden, and become brittle (as shown in the experimental results in Figure 2).
Therefore, it is necessary to satisfy c10N≦0.04%.
■ Ｔｉ、Ｎｂを添加すると、第８図の実験結果に示す
ようにしん性が劣化し易いため、 Ｔｉ＋ Ｎｂ≦０．
０７０％とすル。ナオ、ＴｉとＮｂを両方添加する目的
は、 Ｔｉのみ添加の場合には製缶性・加工性が落ちる
場合があるため、 ＴｉとＮｂを複合添加する。Ｔ１と
Ｎｂの含有比は１：１が望ましい。■ When Ti and Nb are added, the toughness tends to deteriorate as shown in the experimental results in Figure 8, so if Ti+Nb≦0.
070%. The purpose of adding both Ti and Nb is to add a combination of Ti and Nb because if only Ti is added, the can-formability and processability may deteriorate. The content ratio of T1 and Nb is preferably 1:1.
■ 強度を向上させ、かつ、孔食防止の点からＭｏを添
加する。その量は必要強度レベルによって異なるが２通
常１〜４％の範囲とする。(2) Mo is added to improve strength and prevent pitting corrosion. The amount varies depending on the required strength level, but is usually in the range of 1 to 4%.
■ また本発明鋼における望ましい成分及び組成範囲は
次のとおりである。(2) Desirable components and composition ranges for the steel of the present invention are as follows.
０＋Ｎ≦０．０４％、 Ｔｉ ＋Ｎｂ≦０．０７０％。0+N≦0.04%, Ti+Nb≦0.070%.
（Ｔｉ ＋Ｎｂ ）／（０＋Ｎ ）ｋｌ Ｏ９Ｍｏ ：
１〜４％、Ｏｒ：１１〜１４％（このうち１２％付近
とするのが最もよい。）＊Ｓｉ≦１．．Ｏ０％。(Ti +Nb)/(0+N)klO9Mo:
1 to 4%, Or: 11 to 14% (of these, it is best to set it around 12%) *Si≦1. ．． O0%.
ＭｎＳ２．００％、 ８６００４５％、 ｐ ＜、
０．０４．６％、残りＦｃ。MnS2.00%, 860045%, p<,
0.04.6%, remaining Fc.
以上のように２本発明のフェライト系ステンレス鋼にお
いては、多くの長所をもち１例えば火力、原子力、化学
プラント等の配管、チューブ、管板、容器等の高温用材
料として好適である。As described above, the ferritic stainless steel of the present invention has many advantages and is suitable as a high-temperature material for piping, tubes, tube sheets, containers, etc., for example, in thermal power, nuclear power, and chemical plants.
第１〜８図は本発明ステンレス鋼における各種の特性を
示す線図である。
５１θ １５ 勿
丁１′十Ｎν
ＡＭ
拵１図
第２囲
Ｔ＋’十Ｎ１７（Ｗ％）
笛３図
手続補正書（自発）
事件の表示
昭和５７年 特 許 願第 ０３２５４０
号発明の名称
フェライト系ステンレス鋼
補正をする者
事件との関係 特許出願人
住 所 東京都千代田区丸の内二丁目５喬１号
名 称（６加）三菱重工業株式会社
代 理 人
１、 明細書第４百下から５行目ｒ Ｔ １４＋ｂ／ｃ
」、Ｎ １ｒ（Ｔｉ＋Ｎｂ）／（Ｃ＋Ｎ）Ｊ ｔこ
訂正する。
明細書簡５頁６行目［≦０．０７０％、：する。１を「
≦０７俤とする。」と訂正する。
６ 明細書第５頁下から４行目ＩＴ ｉ 十Ｎ ｂ≦０
０７％１をｒＴｉ＋Ｎｂ＝ ０．７％」と訂正する。1 to 8 are diagrams showing various characteristics of the stainless steel of the present invention. 51θ 15 Mucho 1'10Nν AM Koshirae 1 Figure 2 Box T+'10N17 (W%) Fue 3 Figure Procedure Amendment (Voluntary) Case Indication 1982 Patent Application No. 032540
Name of invention No. Ferritic stainless steel Relation to case of person amending ferritic stainless steel Patent applicant address No. 1, 5-5 Taka, Marunouchi 2-chome, Chiyoda-ku, Tokyo Name (6 Canada) Mitsubishi Heavy Industries, Ltd. Representative 1, Specification No. 5th line from 400 below r T 14+b/c
”, N 1r(Ti+Nb)/(C+N)J tCorrect. Specification letter, page 5, line 6 [≦0.070%,: Yes. 1 as “
≦07 tai. ” he corrected. 6 4th line from the bottom of page 5 of the specification IT i 10N b≦0
07%1 is corrected to rTi+Nb=0.7%.
Claims (1)
、及び残部がＦｅからなり、かつ（Ｔｉ＋Ｎｂ）／（０
＋Ｎ ）≧１０となることを特徴とするフェライト系ス
テンレス鋼。[Claims] Or: 11 to 2.0% by weight 1Mo: 1 to 4% by weight. Ti+Nb≦0.70% by weight, C+N≦0.04% by weight
, and the remainder is Fe, and (Ti+Nb)/(0
A ferritic stainless steel characterized in that +N)≧10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3254082A JPS58151456A (en) | 1982-03-02 | 1982-03-02 | Ferritic stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3254082A JPS58151456A (en) | 1982-03-02 | 1982-03-02 | Ferritic stainless steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58151456A true JPS58151456A (en) | 1983-09-08 |
Family
ID=12361764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3254082A Pending JPS58151456A (en) | 1982-03-02 | 1982-03-02 | Ferritic stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58151456A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61138005A (en) * | 1984-12-11 | 1986-06-25 | 株式会社東芝 | Feedwater heater |
| JPS636303A (en) * | 1986-06-25 | 1988-01-12 | 株式会社東芝 | Feedwater heater |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5188413A (en) * | 1975-02-01 | 1976-08-03 | Kotaishokuseifueraitosutenresuko | |
| JPS55110759A (en) * | 1979-02-16 | 1980-08-26 | Kobe Steel Ltd | Ferrite stainless steel with stress corrosion crack resistance in high temperature pure water |
-
1982
- 1982-03-02 JP JP3254082A patent/JPS58151456A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5188413A (en) * | 1975-02-01 | 1976-08-03 | Kotaishokuseifueraitosutenresuko | |
| JPS55110759A (en) * | 1979-02-16 | 1980-08-26 | Kobe Steel Ltd | Ferrite stainless steel with stress corrosion crack resistance in high temperature pure water |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61138005A (en) * | 1984-12-11 | 1986-06-25 | 株式会社東芝 | Feedwater heater |
| JPS636303A (en) * | 1986-06-25 | 1988-01-12 | 株式会社東芝 | Feedwater heater |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH03274245A (en) | Ferritic heat-resistant stainless steel excellent in low temperature toughness, weldability and heat resistance | |
| JPH05345949A (en) | Heat resistant low cr ferritic steel excellent in toughness and creep strength | |
| JPH0123544B2 (en) | ||
| JPH02141558A (en) | Corrosion resistance ferrite stainless steel welded pipe having high resistance to hydrogen embrittlement and cathode-protecting heat exchanger including same | |
| US5275893A (en) | Line pipe having good corrosion-resistance and weldability | |
| JP2001246494A (en) | Welding material for low carbon martensitic stainless steel and arc welding method for low carbon martensitic stainless steel | |
| CA2162704A1 (en) | High-strength austenitic heat-resistant steel excellent in weldability and good in high-temperature corrosion resistance property | |
| JPS59150692A (en) | Welding material of ferrite-austenite two-phase stainless steel | |
| JPS58151456A (en) | Ferritic stainless steel | |
| GB1564243A (en) | Austenitic stainless steel | |
| JP2002226947A (en) | Martensitic stainless steel welded joint having excellent strain aging resistance | |
| JPS5943848A (en) | Ferritic stainless steel | |
| EP0780483B1 (en) | High-strength austenitic heat-resisting steel having improved weldability | |
| JP2000301377A (en) | Welded joint of ferritic heat resistant steel and welding material | |
| JP3165902B2 (en) | High Cr steel welding method | |
| JPS5943849A (en) | Ferritic stainless steel | |
| JP2575250B2 (en) | Line pipe with excellent corrosion resistance and weldability | |
| JPS5943847A (en) | Ferritic stainless steel | |
| JPH01159351A (en) | Austenitic stainless steel excellent in corrosion resistance in warm water | |
| JPH10195607A (en) | High chromium steel for line pipe excellent in toughness of welded part and stress corrosion cracking resistance | |
| JPS57126954A (en) | Corrosion-resistant ferritic stainless steel | |
| JPS642660B2 (en) | ||
| JPH0357182A (en) | Sheathed heater unit | |
| JPS61136662A (en) | Austenitic stainless steel having superior resistance to stress corrosion cracking | |
| JPS54121224A (en) | Cast stainless steel for extremely low temperature use |