JPS62267454A - Austenitic stainless steel having superior creep strength - Google Patents
Austenitic stainless steel having superior creep strengthInfo
- Publication number
- JPS62267454A JPS62267454A JP11053486A JP11053486A JPS62267454A JP S62267454 A JPS62267454 A JP S62267454A JP 11053486 A JP11053486 A JP 11053486A JP 11053486 A JP11053486 A JP 11053486A JP S62267454 A JPS62267454 A JP S62267454A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- creep strength
- austenitic stainless
- less
- strength
- 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
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 229910052742 iron Inorganic materials 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 26
- 239000010959 steel Substances 0.000 abstract description 26
- 230000007797 corrosion Effects 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 10
- 239000000203 mixture Substances 0.000 abstract description 3
- 229910052804 chromium Inorganic materials 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、高温用鋼に係り特にクリープ強度に曖れた
オーステナイトステンし・ス鋼に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to high-temperature steels, and particularly relates to austenitic stainless steels having poor creep strength.
高温用のオーステナイトステンレス鋼として現在実用化
されている鋼としては、 ５ＵＳ３０４．３１６．３
２１．３４７鋼等がある。Steels currently in practical use as high-temperature austenitic stainless steels include 5US304.316.3.
21.347 steel etc.
これらの鋼の高温での強化因子は、炭化物が主体である
。例えば、５ＵＳ３０４．３１６ではＣｒ３Ｃ６，５Ｕ
Ｓ３２１ではＴ ｉ Ｃ、５ＵＳ３４７ではＮｂＣ等で
ある。The strengthening factor of these steels at high temperatures is mainly carbides. For example, in 5US304.316, Cr3C6,5U
S321 is T i C, 5US347 is NbC, etc.
高温用材料に要求されろ特性としては、高温強度の他に
耐食性が挙げられろ。然し耐食性に対し □て炭素は有
害であり、極力低炭素鋼にすることが望まれるが、高温
強度が著しく低下する。In addition to high-temperature strength, corrosion resistance is also required for high-temperature materials. However, carbon is harmful to corrosion resistance, and although it is desirable to use as low-carbon steel as possible, the high-temperature strength will drop significantly.
このため極低炭素鋼では、高温強度改善のため高窒素と
した５ＵＳ３０４ＬＮ、 ５ＵＳ３１６ＬＮ鋼等が開発
されているが、何れも長時間のクリープ破断強度が低下
するという問題が生じている。For this reason, ultra-low carbon steels such as 5US304LN and 5US316LN steels containing high nitrogen have been developed to improve high-temperature strength, but both have the problem of reduced long-term creep rupture strength.
又Ｔ ｉ 、 Ｎ ｂ ＠添加し炭素をＴｉＣ，ＮｂＣ
で固定する５ＵＳ３２１．５ＵＳ３４７ ｙＩも極低炭
素鋼に比べて充分な耐食性を有してない。Also, T i , N b @ is added to convert carbon into TiC, NbC
5US321.5US347yI, which is fixed with 5US321.5US347yI, also does not have sufficient corrosion resistance compared to ultra-low carbon steel.
そのため極低炭素であり、且つ高温強度に擾れた鋼の開
発が望まれている。Therefore, there is a desire to develop steel that has extremely low carbon content and has excellent high-temperature strength.
一方耐食性の面から炭素量を０．０１ｗｔに以下にする
ことで、高温水中等におけろ応力腐食割れが防止出来る
ことは良く知られているが、上述したように極低炭素で
は、高温強度が充分ではない。On the other hand, it is well known that stress corrosion cracking can be prevented even in high-temperature water by reducing the carbon content to 0.01wt or less from the perspective of corrosion resistance. is not enough.
今
本発明は、極低炭素鋼に対し、Ｔｉ、Ｐを適量添加する
ことにより、現用鋼以上のクリープ強度を有するオース
テナイトステンＬ・ス鋼を提供することを目的とするも
のである。The object of the present invention is to provide an austenitic stainless L/S steel having a creep strength higher than that of current steel by adding appropriate amounts of Ti and P to ultra-low carbon steel.
本発明は、Ｔ ｉ 、 Ｐを適量添加することにより、
極低炭素においても現用の１８−８系ステ、ルス鋼以上
のクリープ強度を有する鋼を見出しなされたものである
。In the present invention, by adding appropriate amounts of T i and P,
Even at extremely low carbon levels, we have discovered a steel that has a creep strength higher than that of the currently used 18-8 steel and steel.
即ち、本発明の第１発明は、重量基準にて、Ｃ：０．０
ＩＸ以下、Ｓｉ：］、０％以下、Ｍｎ：２．０％以下、
Ｐ： ０．００３〜０１０８％、 Ｓ ： ０．
０．０３％以下、Ｎ ｉ ： １０−．１８％、Ｃｒ
： １３〜２０％、Ｔ ｉ ： １．５〜２．５
Ｊ Ｔ 、 Ｎ ： ０．０２Ｘ以下、残部Ｆｅ
及び不可避不純物からなるりＩＪ−プ強度に曖れたオー
ステナイトステンし・ス鋼であり０、
第２発明は、第１発明の成分に加わるに、Ｍｏ：１、！
＋〜３．０％、 Ｃｕ ： ２．５〜３．５Ｘの一種又
は二種を含むことからなるクリープ強度に擾れたオース
テナイトステンレス鋼である。That is, in the first aspect of the present invention, on a weight basis, C: 0.0
IX or less, Si: ], 0% or less, Mn: 2.0% or less,
P: 0.003-0108%, S: 0.
0.03% or less, Ni: 10-. 18%, Cr
: 13-20%, Ti: 1.5-2.5
JT, N: 0.02X or less, balance Fe
The second invention is an austenitic stainless steel containing unavoidable impurities and having ambiguous IJ-P strength.The second invention has Mo: 1,!
It is an austenitic stainless steel with poor creep strength, containing one or both of the following: +~3.0% Cu: 2.5~3.5X.
本発明鋼の成分限定理由について以下に述べる。 The reason for limiting the composition of the steel of the present invention will be described below.
Ｃ：＃４食性に有害な元素であるため、極力少ない方が
望ましく 、０，０１ｗｔＸ以下にすれば実用環境中で
は十分な耐食性が得られるため上限を０．０１ｗｔｘに
する。C: #4 Since it is an element harmful to corrosion, it is desirable to reduce it as much as possible, and if it is less than 0.01 wtx, sufficient corrosion resistance can be obtained in a practical environment, so the upper limit is set to 0.01 wtx.
Ｓｉ：脱酸剤又は耐酸化性改善のため添加させるが、過
剰の添加はシグマ相の析出を促進させるため、上限を１
ｗｔＸにする。Si: Added as a deoxidizer or to improve oxidation resistance, but excessive addition promotes precipitation of sigma phase, so the upper limit is set to 1.
Make it wtX.
Ｍｎ：脱酸、脱硫を目的に添加されるが、２ ｗｔＸを
超える添加はその効果が有効でないため、上限を２ ｗ
ｔＺにする。Mn: It is added for the purpose of deoxidation and desulfurization, but the effect is not effective if it exceeds 2 wtX, so the upper limit is set to 2 w
Make it tZ.
Ｓ：ｆＡ間加工性に有害な元素であ）ｌ 、０．０３＊
ｔＸを超えると製造時に熱間加工割れを生じるため、上
限を０．０３＊ｔＸニする。S: fA is an element harmful to machinability) l, 0.03*
If it exceeds tX, hot working cracks will occur during manufacturing, so the upper limit is set to 0.03*tX.
Ｎ１ニオ−ステナイト相生成のため必要な元素であり、
１０ｗ１未瀾ではマルテシサイト或いはフェライ）・相
を生じろため１０＋ｖｔＸ以上の含有が必要である。又
Ｎｉは高価な元素であるため、過剰の含有は経済的に有
利でないため上限を１８ｗｔ％にする。It is an element necessary for the formation of N1 niostenite phase,
If 10w1 is not mixed, a martesisite or ferrite phase will occur, so it is necessary to contain 10+vtX or more. Further, since Ni is an expensive element, excessive content is not economically advantageous, so the upper limit is set at 18 wt%.
Ｃｒ：耐酸化性、耐食性から１３ｗｔ＊以上必要である
が、過剰の含有はオーステナイト相の安定のためＮｌ量
を増す必要があること、シグマ相を生成しやすくするこ
とから上限を２（ｌｖｔ２にする。Cr: 13 wt* or more is required for oxidation resistance and corrosion resistance, but excessive content requires an increase in the amount of Nl to stabilize the austenite phase and makes it easier to generate the sigma phase, so the upper limit is set to 2 (lvt2). do.
Ｔ１：クリープ強度の向上に有効な元素であるが、１、
５ｗｔｚ未満で（よりリープ強度の改善が十分でなく、
２、５ｗｔ＊を超丸ると脆化相を生成し、靭性を損なう
ためその含有範囲を１．５〜２．５ｗｔににする。T1: An element effective in improving creep strength, but 1,
Below 5wtz (improvement in leap strength is not sufficient,
If 2.5 wt* is too round, a brittle phase will be generated and the toughness will be impaired, so the content range is set to 1.5 to 2.5 wt.
Ｔ、Ｎ：窒素は溶製中Ｔ ｉ Ｎを生成し、クリープ強
度に有効なＴｉ量を減じるためその上限を０．０２ｗ（
Ｘにする。T, N: Nitrogen generates TiN during melting and reduces the amount of Ti effective for creep strength, so the upper limit is set at 0.02w (
Make it X.
Ｍｏ、Ｃｕ：何れも耐食性、高温強度の改善に有効な元
素であるが、含有量が少ない場合その効果が認められず
、又過剰の含有は高価な元素であるため、経済性を損な
うことから、その含有量を夫々１．５〜３．０ｗｌ、
２．５〜３．５ｚにする。Mo, Cu: Both are effective elements for improving corrosion resistance and high-temperature strength, but if the content is small, the effect will not be recognized, and if the content is excessive, it will impair economic efficiency as they are expensive elements. , the content of which is 1.5 to 3.0 wl, respectively.
Set it to 2.5-3.5z.
Ｐ：本発明の特徴の一つであり、０．０３ｗｔＸ未満て
は効果が認められず、又０．０８ｗｔｘを超えると溶接
性を損なうため、その範囲を０．０３ｗｔ＊≦Ｐ≦０゜
０８＋ｖｔＸにする。P: This is one of the characteristics of the present invention, and if it is less than 0.03wtX, no effect will be observed, and if it exceeds 0.08wtx, weldability will be impaired, so the range is 0.03wt*≦P≦0°08+vtX Make it.
次に本発明の実施例について述べる。Next, examples of the present invention will be described.
次表に示したＮｏ、 １〜１１の鋼（本発明鋼Ｎｏ、
１〜６、比較鋼Ｎｏ、 ７〜１１）を真空溶製し、１０
ｋｇ消塊とした後、熱間圧延にて１２ｍｍｔの板とした
。Steels No. 1 to 11 shown in the following table (invention steel No.
1 to 6, comparative steel No. 7 to 11) were vacuum melted, and 10
It was made into a 12 mm thick plate by hot rolling.
溶体化処理を１０５０℃にて行ない、平行部径６關φ、
標点距離３０ＩＩＩＩＩ＋の試験片を採取し、７００’
Ｃにてクリープ試験を行った。Solution treatment was carried out at 1050℃, parallel part diameter 6 φ,
A test piece with a gauge length of 30III+ was taken, and the gauge length was 700'
A creep test was conducted at C.
比較鋼Ｎｏ、１０．１１は、１１５０℃の溶体化処理条
件で行った。Comparative steel No. 10.11 was subjected to solution treatment at 1150°C.
クリープ試験は応力１０ｋｇｆ／鴎”で行い、評点距離
３０間間の伸びを連続的に測定し、定常クリープ速度を
求めた。The creep test was carried out under a stress of 10 kgf/Kuji, and the elongation between 30 rating distances was continuously measured to determine the steady-state creep rate.
本発明鋼の特徴はＴ ｉ 、 Ｐを適量添加することに
よりクリープ強度が改善される点である。A feature of the steel of the present invention is that creep strength is improved by adding appropriate amounts of Ti and P.
比較鋼Ｎｏ、 ７はＴｉ、Ｐ量とも本発明範囲内の場合
であり、クリープ強度は９．０ｘｌＯ−’ｘハと著しく
低い。Ｐ量を本発明範囲内にすることにより比較ｆｒ４
！＆１８に示すようにクリープ強度は向上するが、Ｔｉ
旦が低いため同程度のＰｉである本発明川魚１に比ベク
リープ強度は劣る。Comparative steel No. 7 has both Ti and P contents within the range of the present invention, and the creep strength is extremely low at 9.0xlO-'xha. By setting the P amount within the range of the present invention, comparison fr4
! As shown in &18, the creep strength improves, but Ti
Since the temperature is lower, the creep strength is inferior to the river fish 1 of the present invention, which has the same Pi.
又Ｔ１量を本発明範囲内とした比較ｆｉ）Ｊｏ、９のク
リープ強度は２．９Ｘ１０−．０３％ハと向上するが、
Ｐ量が低いため本発明鋼程の強度は得られない。In addition, the creep strength of the comparison fi) Jo, 9 where the T1 amount was within the range of the present invention was 2.9X10-. Although it improves by 0.3%,
Since the amount of P is low, strength as high as that of the steel of the present invention cannot be obtained.
現用鋼として広く用いられている５ＵＳ３２１［（、３
４７Ｈ（比較ｆｉｌＪｏ、ＩＯ，ＩＩ）に比べても本発
明鋼Ｎｏ、 １〜３は格段と優れたクリープ強度を有し
ており、更にＭ ｏ 。5US321 [(, 3
Compared to 47H (comparison filJo, IO, II), the invention steel Nos. 1 to 3 have significantly superior creep strength, and furthermore, M o .
Ｃｕ、或いはＭｏとＣｕを含有させた本発明ｎ４４４〜
６はより優れたクリープ強度を示すことは本実施例より
明らかである。Invention n444 containing Cu or Mo and Cu
It is clear from this example that No. 6 exhibits superior creep strength.
本発明のクリープ強度に漫れたオーステナイトステンレ
ス鋼は、極低炭素鋼であってもＴｉ、Ｐ量を適量含有さ
せることにより、現用ｙ４息上のクリープ強度を有する
ものである。The austenitic stainless steel of the present invention, which has excellent creep strength, has a creep strength that exceeds that of current Y4 steels by containing appropriate amounts of Ti and P even if it is an extremely low carbon steel.
Claims (2)
０％以下、Ｍｎ：２．０％以下、Ｐ：０．００３〜０．
０８％、Ｓ：０．０３％以下、Ｎｉ：１０〜１８％、Ｃ
ｒ：１３〜２０％、Ｔｉ：１．５〜２．５％、Ｔ．Ｎ：
０．０２％以下、残部Ｆｅ及び不可避不純物からなるこ
とを特徴とするクリープ強度に優れたオーステナイトス
テンレス鋼。(1) Based on weight, C: 0.01% or less, Si: 1.
0% or less, Mn: 2.0% or less, P: 0.003 to 0.
08%, S: 0.03% or less, Ni: 10-18%, C
r: 13-20%, Ti: 1.5-2.5%, T. N:
An austenitic stainless steel with excellent creep strength characterized by comprising 0.02% or less, the balance being Fe and unavoidable impurities.
０％以下、Ｍｎ：２．０％以下、Ｐ：０．００３〜０．
０８％、Ｓ：０．０３％以下、Ｎｉ：１０〜１８％、Ｃ
ｒ：１３〜２０％、Ｔｉ：１．５〜２．５％、Ｔ．Ｎ：
０．０２％以下、及びＭｏ：１．５〜３．０％、Ｃｕ：
２．５〜３．５％の一種又は二種を含み、残部Ｆｅ及び
不可避不純物からなることを特徴とするクリープ強度に
優れたオーステナイトステンレス鋼。(2) Based on weight, C: 0.01% or less, Si: 1.
0% or less, Mn: 2.0% or less, P: 0.003 to 0.
08%, S: 0.03% or less, Ni: 10-18%, C
r: 13-20%, Ti: 1.5-2.5%, T. N:
0.02% or less, Mo: 1.5 to 3.0%, Cu:
An austenitic stainless steel with excellent creep strength, characterized in that it contains 2.5 to 3.5% of one or both of the elements, with the remainder consisting of Fe and unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11053486A JPS62267454A (en) | 1986-05-16 | 1986-05-16 | Austenitic stainless steel having superior creep strength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11053486A JPS62267454A (en) | 1986-05-16 | 1986-05-16 | Austenitic stainless steel having superior creep strength |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62267454A true JPS62267454A (en) | 1987-11-20 |
Family
ID=14538246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11053486A Pending JPS62267454A (en) | 1986-05-16 | 1986-05-16 | Austenitic stainless steel having superior creep strength |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62267454A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008087807A1 (en) | 2007-01-15 | 2008-07-24 | Sumitomo Metal Industries, Ltd. | Austenitic stainless steel welded joint and austenitic stainless steel welding material |
| WO2009093676A1 (en) | 2008-01-25 | 2009-07-30 | Sumitomo Metal Industries, Ltd. | Welding material and welded joint structures |
-
1986
- 1986-05-16 JP JP11053486A patent/JPS62267454A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008087807A1 (en) | 2007-01-15 | 2008-07-24 | Sumitomo Metal Industries, Ltd. | Austenitic stainless steel welded joint and austenitic stainless steel welding material |
| US8137613B2 (en) | 2007-01-15 | 2012-03-20 | Sumitomo Metal Industries, Ltd. | Austenitic stainless steel welded joint and austenitic stainless steel welding material |
| WO2009093676A1 (en) | 2008-01-25 | 2009-07-30 | Sumitomo Metal Industries, Ltd. | Welding material and welded joint structures |
| US7951469B2 (en) | 2008-01-25 | 2011-05-31 | Sumitomo Metal Industries, Ltd. | Welding material and welded joint structure |
| US8158274B2 (en) | 2008-01-25 | 2012-04-17 | Sumitomo Metal Industries, Ltd. | Welding material and welded joint structure |
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