JP2018003054A5 - - Google Patents
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- JP2018003054A5 JP2018003054A5 JP2016127797A JP2016127797A JP2018003054A5 JP 2018003054 A5 JP2018003054 A5 JP 2018003054A5 JP 2016127797 A JP2016127797 A JP 2016127797A JP 2016127797 A JP2016127797 A JP 2016127797A JP 2018003054 A5 JP2018003054 A5 JP 2018003054A5
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- corrosion resistance
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- 229910052796 boron Inorganic materials 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229910001039 duplex stainless steel Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000003009 desulfurizing Effects 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000009114 investigational therapy Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
Description
本発明は、上記検討によってなされたものであり、質量％で、Ｃ：０．０５％以下、Ｓｉ：０．１６〜１．０％、Ｍｎ：０．１〜１．３％、Ｐ：０．００５〜０．０４０％以下、Ｓ：０．０００２〜０．００３％、Ａｌ：０．００２〜０．０５０％、Ｎ：０．０５〜０．４００％、Ｎｉ：５〜８％、Ｃｒ：２０〜２７％、Ｍｏ：２〜５％、Ｂ：０．０００１〜０．００２０％、Ｃａ：０．０００１〜０．００２０％、Ｗ：０．０３〜０．２０％、Ｃｕ：０．０１〜０．３０％、Ｏ：０．０００２〜０．００８％を含有し、残部がＦｅおよび不可避的不純物からなる成分組成を有する二相ステンレス鋼であって、ＰおよびＢが（１）式を満たし、Ｓｉ，Ｍｎ，Ｎｉ，Ｃｒ，Ｍｏ，ＮおよびＢが（２）式を満たすことを特徴とする。
％Ｐ−１０％Ｂ＋０．００５≧０ …（１）
５％Ｓｉ＋３０％Ｍｎ＋１０％Ｎｉ＋７％Ｃｒ＋３０％Ｍｏ−５０％Ｎ−５０００％Ｂ＜３５５ …（２）
The present invention has been made by the above investigation, and in mass%, C: 0.05% or less, Si: 0.16 to 1.0%, Mn: 0.1 to 1.3%, P: 0 .005 to 0.040% or less, S: 0.0002 to 0.003%, Al: 0.002 to 0.050 %, N: 0.05 to 0.400 %, Ni: 5 to 8%, Cr 20 to 27%, Mo: 2 to 5%, B: 0.0001 to 0.0020%, Ca: 0.0001 to 0.0020%, W: 0.03 to 0.20%, Cu: 0. A duplex stainless steel having a component composition containing 01 to 0.30%, O: 0.0002 to 0.008% and the balance being Fe and unavoidable impurities, wherein P and B are represented by the formula (1) And Si, Mn, Ni, Cr, Mo, N and B satisfy the formula (2).
% P-10% B + 0.005 ≧ 0 (1)
5% Si + 30% Mn + 10% Ni + 7% Cr + 30% Mo-50% N-5000% B <355 (2)
Ｎ：０．０５〜０．４００％
Ｎは、強力なオーステナイト生成元素であり、後述するＣｒやＭｏと同様、耐食性を向上させるとともに、金属間化合物の析出を抑制するのに有効な元素であるので、０．０５％以上含有させる。一方、０．４００％を超えて含有させると、熱間変形抵抗が上昇して熱間加工性を阻害するとともに、二相組織を維持することが困難となり耐粒界腐食性が劣化する。さらに窒化物の析出により耐孔食性も劣化する。よって、Ｎは０．０５〜０．４００％の範囲とする。好ましくは０．１〜０．３５％、より好ましくは０．１５〜０．３２％の範囲である。
N: 0.05 to 0.400 %
N is a strong austenite-forming element and, like Cr and Mo described later, is an element effective to improve the corrosion resistance and to suppress the precipitation of intermetallic compounds, so it is contained by 0.05% or more. On the other hand, if the content is more than 0.400 %, the hot deformation resistance is increased to inhibit the hot workability, and it is difficult to maintain the two-phase structure and the intergranular corrosion resistance is deteriorated. Furthermore, pitting corrosion resistance is also degraded due to the precipitation of nitrides. Therefore, N is in the range of 0.05 to 0.400 %. Preferably, it is in the range of 0.1 to 0.35%, more preferably 0.15 to 0.32%.
Ａｌ：０．００２〜０．０５０％
Ａｌは有効な脱酸元素であり、脱酸によって脱硫を促進してＳを低減し、熱間加工性や耐食性の向上に有効な元素である。その効果は０．００２％以上の添加により得られる。しかし、過剰な添加は過剰な脱酸、それに伴う脱硫を引き起こし、界面活性元素である硫黄の極端な低減を招き、窒素添加量の制御が困難となる。従ってその上限を０．０５０％とする。好ましくは０．００３〜０．０４％、より好ましくは０．００４〜０．０３％の範囲である。
Al: 0.002 to 0.050 %
Al is an effective deoxidizing element, promotes desulfurization by deoxidation to reduce S, and is an element effective to improve hot workability and corrosion resistance. The effect is obtained by addition of 0.002% or more. However, excessive addition causes excessive deoxidation and concomitant desulfurization, leading to extreme reduction of the surfactant element sulfur, making it difficult to control the amount of nitrogen added. Therefore, the upper limit is made 0.050 %. Preferably, it is in the range of 0.003 to 0.04%, more preferably 0.004 to 0.03%.
Claims (1)
Ｃ：０．０５％以下、
Ｓｉ：０．１６〜１．０％、
Ｍｎ：０．１〜１．３％、
Ｐ：０．００５〜０．０４０％以下、
Ｓ：０．０００２〜０．００３％、
Ａｌ：０．００２〜０．０５０％、
Ｎ：０．０５〜０．４００％、
Ｎｉ：５〜８％、
Ｃｒ：２０〜２７％、
Ｍｏ：２〜５％、
Ｂ：０．０００１〜０．００２０％、
Ｃａ：０．０００１〜０．００２０％、
Ｗ：０．０３〜０．２０％、
Ｃｕ：０．０１〜０．３０％、
Ｏ：０．０００２〜０．００８％
を含有し、残部がＦｅおよび不可避的不純物からなる成分組成を有する二相ステンレス鋼であって、
上記ＰおよびＢが（１）式を満たし、
上記Ｓｉ，Ｍｎ，Ｎｉ，Ｃｒ，Ｍｏ，ＮおよびＢが（２）式を満たすことを特徴とする二相ステンレス鋼。
％Ｐ−１０％Ｂ＋０．００５≧０ …（１）
５％Ｓｉ＋３０％Ｍｎ＋１０％Ｎｉ＋７％Ｃｒ＋３０％Ｍｏ−５０％Ｎ−５０００％Ｂ＜３５５ …（２） In mass%,
C: 0.05% or less,
Si: 0.16 to 1.0%,
Mn: 0.1 to 1.3%,
P: 0.005 to 0.040% or less,
S: 0.0002 to 0.003%,
Al: 0.002 to 0.050 %,
N: 0.05 to 0.400 %,
Ni: 5-8%,
Cr: 20 to 27%,
Mo: 2 to 5%,
B: 0.0001 to 0.0020%,
Ca: 0.0001 to 0.0020%,
W: 0.03 to 0.20%,
Cu: 0.01 to 0.30%,
O: 0.0002 to 0.008%
A duplex stainless steel having a component composition containing the balance, the balance being Fe and unavoidable impurities,
P and B satisfy the formula (1),
A duplex stainless steel characterized in that the above Si, Mn, Ni, Cr, Mo, N and B satisfy the formula (2).
% P-10% B + 0.005 ≧ 0 (1)
5% Si + 30% Mn + 10% Ni + 7% Cr + 30% Mo-50% N-5000% B <355 (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016127797A JP6771963B2 (en) | 2016-06-28 | 2016-06-28 | Duplex stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016127797A JP6771963B2 (en) | 2016-06-28 | 2016-06-28 | Duplex stainless steel |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2018003054A JP2018003054A (en) | 2018-01-11 |
| JP2018003054A5 true JP2018003054A5 (en) | 2019-06-20 |
| JP6771963B2 JP6771963B2 (en) | 2020-10-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2016127797A Active JP6771963B2 (en) | 2016-06-28 | 2016-06-28 | Duplex stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP6771963B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6776469B1 (en) * | 2020-03-13 | 2020-10-28 | 日本冶金工業株式会社 | Duplex stainless steel and its manufacturing method |
| CN116997670A (en) * | 2021-03-15 | 2023-11-03 | 日铁不锈钢株式会社 | Duplex stainless steel |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4184869B2 (en) * | 2003-05-29 | 2008-11-19 | 日本冶金工業株式会社 | High corrosion resistance duplex stainless steel |
| JP6482074B2 (en) * | 2014-09-02 | 2019-03-13 | 日本冶金工業株式会社 | Duplex stainless steel sheet and its manufacturing method |
| JP6482075B2 (en) * | 2014-09-02 | 2019-03-13 | 日本冶金工業株式会社 | Welded duplex stainless steel pipe and its manufacturing method |
-
2016
- 2016-06-28 JP JP2016127797A patent/JP6771963B2/en active Active
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