CN1187467C - Two-phase stainless steel - Google Patents
Two-phase stainless steel Download PDFInfo
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- CN1187467C CN1187467C CNB021451729A CN02145172A CN1187467C CN 1187467 C CN1187467 C CN 1187467C CN B021451729 A CNB021451729 A CN B021451729A CN 02145172 A CN02145172 A CN 02145172A CN 1187467 C CN1187467 C CN 1187467C
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Abstract
The present invention relates to a two-phase stainless steel comprising the following components, in weight percentages, 0.01 to 0.12% of C, 4.0 to 8.0 % of Mn, 12.0 to 25.0% of Cr, 0.20 to 1.5% of Al, 0.5 to 3.0% of Ni, 0.4 to 3.0% of Mo, at most 1.0% of Cu, 0.2 to 2.5% of Si, 0.05 to 0.3% of N, 0.02 to 0.05% of Re, at most 0.03% of S, at most 0.035% of P and balance of Fe. The two-phase stainless steel resists alkali and acid corrosion and has the advantages of strong stress corrosion cracking resistance, crevice corrosion resistance and air bubble corrosion resistance capability especially under the condition of resisting chlorine ions and in oxidized acid media, high intensity, high toughness, favorable cold and hot processing performance and low cost.
Description
Technology neck city
The present invention relates to a kind of stainless steel.
Background technology
In decades, domestic and international most popular stainless steel is a nickel chromium stainless steel, and wherein the consumption maximum is austenilic Ni-Cr stainless steel.Since finding and use duplex stainless steel the thirties in 20th century,, begun to obtain the attention of scientific and technological circle and industry member and accelerated development in the eighties with its good anti-pitting and stress corrosion crack performance.So far become and one of ferrite, Austenitic stainless steel three major types stainless steel arranged side by side.China's duplex stainless steel that begun one's study since the seventies in 20th century, existing so far and external corresponding several trades mark are for road has been opened up in the development and the application of China's duplex stainless steel.But these duplex stainless steels all are nickel chromium stainless steels.Because the ground ore reserve of nickel and chromium element are relative less, produce the cost costliness.For this reason, scientific and technical personnel for nickel, have made some iron, manganese, aluminium alloy and iron-manganese-aluminium-chromium austenite stainless steel with aluminium for chromium with manganese according to the similarity of manganese and nickel, aluminium and chromium pantogen minor structure and physicals.But these iron-manganese-aluminium-chromium austenite stainless steel all have acid resistance poor, the shortcoming of the thick and column crystal prosperity of crystal grain, and influenced their use properties and range of application.
Summary of the invention
The purpose of this invention is to provide a kind of excellent performance is the duplex stainless steel of main added elements with manganese, chromium, aluminium.
Duplex stainless steel provided by the invention, its chemical ingredients and each component content (weight %) are as follows: 0～0.12%C, 4.0～8.0%Mn, 12.0～25.0%Cr, 0.20～1.5%Al, 0.5～3.0%Ni, 0.4～3.0%Mo, 0～1.0%Cu, 0.2～2.5%Si, 0.05～0.3%N, 0.02～0.05%Re ,≤0.03%S ,≤0.035%P, surplus Fe.
Each composition preferred content (weight %) is:
0～0.06%C, 5.0～8.0%Mn, 16.0～22.0%Cr, 0.2～1.2%Al, 1.0～3.0%Ni, 0.4～2.0%Mo, 0～1.0%Cu, 0.8～1.0%Si, 0.05～0.2%N, 0.02～0.04%Re ,≤0.03%S ,≤0.035%P, surplus Fe.
Duplex stainless steel of the present invention has the following advantages:
1, has stronger acid-alkali-corrosive-resisting performance.Especially at highly basic (as NaOH), chlor-alkali (NH
4Cl), oxidizing acid is (as HNO
3), stress corrosion dehiscence resistant, anti-general corrosion, intergranular corrosion resistance and anti-spot corrosion, cavitation corrosion in seawater in the solution such as Sodium Thiocyanate 99 and phosphoric acid salt have obvious superiority;
2, intensity height, good toughness, anti-corrosion wear are excellent.Yield strength б s doubles above greater than 450Mpa than austenitic stainless steel OCr18Ni9 commonly used (304), 00Cr17Ni12Mo2Ti (316L).Simultaneously, also higher than 00Cr18-Mo type and 00Cr22-Mo type nickel chromium triangle duplex stainless steel.Breakdown point (б b) is greater than 800MPa, and is for 1.5 times of chromium-nickel austenitic stainless steel 304 commonly used, 316L, also high more than 20% than 00Cr18-Mo type and 00Cr22-Mo type nickel chromium triangle duplex stainless steel.Impelling strength (a
k) 〉=120J is all higher more than 20% than above-mentioned nickel chromium stainless steel.Unit elongation (δ
5) 〉=25% is suitable with 00Cr22-Mo type nickel chromium triangle duplex stainless steel.Good comprehensive mechanical property and solidity to corrosion make duplex stainless steel of the present invention more much higher than the anti-corrosion wear ability of nickel chromium triangle duplex stainless steel.In using, petrochemical complex, salt chemical engineering and phosphorous chemical industry field more show its superiority.
3, the component prescription of uniqueness of the present invention makes it at room temperature have ferrite with suitable processing and respectively accounts for 35～65% ratio mutually with austenite, and crystal grain is tiny, the nonmetallic impurity rareness, and the tissue that crystal boundary purifies has guaranteed above-mentioned high-performance.
4, the stainless starting material of melting the present invention adopt ordinary scrap steel, industrial electrolysis manganese, and the aluminium scrap cable, humble carbon ferrochrome, the source is sufficient, and is cheap, and cost reduces by 20～50% than 18～8 nickel chromium stainless steels and 00Cr22-Mo type duplex stainless steel.
Embodiment
Embodiment:
Duplex stainless steel of the present invention is starting material with steel scrap (08F), industrial electrolysis manganese, nitrided ferro-chromium, molybdenum-iron, aluminium scrap cable and useless nickel chromium stainless steel.Its composition (weight %) is≤0.04%C, 5.0～8.0%Mn, 20.0～22.0%Cr, 0.6～1.2%Al, 1.5%Ni, 0.8～1.5%Mo, 0.8～1.0%Cu, 0.8～1.0%Si, 0.05～0.1%N, 0.02%Re ,≤0.03%S ,≤0.035%p, all the other are Fe.By this composition with starting material batching baking dehumidifying back ingot casting after the melting in medium-frequency induction furnace or electric arc furnace.Quality product requires can carry out AOD refining or esr when high.Solid solubility temperature is 980 ℃-1080 ℃, in good time insulation back air cooling or water-cooled.Duplex stainless steel of the present invention can be cast or rolling becoming a useful person as required, or forges into base in 1150 ℃ of-850 ℃ of temperature ranges.Then through being machined into part.
Ferrite austenite duplex stainless steel of the present invention can be widely used in fields such as oil, chemical industry, shipbuilding, building, vehicle, papermaking, printing and dyeing, pharmacy, food, people's livelihood apparatus.
Claims (2)
1, a kind of duplex stainless steel is characterized in that its chemical ingredients and each component content (weight %) are as follows:
0～0.12％C、4.0～8.0％Mn、12.0～25.0％Cr、0.20～1.5％Al、0.5～3.0％Ni、
0.4～3.0％Mo、0～1.0％Cu、0.2～2.5％Si、0.05～0.3％N、0.02～0.05％Re、
≤ 0.03%S ,≤0.035%P, surplus Fe.
2, by the described duplex stainless steel of claim 1, it is characterized in that each component content (weight %) is:
0～0.06％C、5.0～8.0％Mn、16.0～22.0％Cr、0.2～1.2％Al、1.0～3.0％Ni、
0.4～2.0％Mo、0～1.0％Cu、0.8～1.0％Si、0.05～0.2％N、0.02～0.04％Re、
≤ 0.03%S ,≤0.035%P, surplus Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021451729A CN1187467C (en) | 2002-11-08 | 2002-11-08 | Two-phase stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021451729A CN1187467C (en) | 2002-11-08 | 2002-11-08 | Two-phase stainless steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1412337A CN1412337A (en) | 2003-04-23 |
| CN1187467C true CN1187467C (en) | 2005-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021451729A Expired - Fee Related CN1187467C (en) | 2002-11-08 | 2002-11-08 | Two-phase stainless steel |
Country Status (1)
| Country | Link |
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| CN (1) | CN1187467C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432262C (en) * | 2006-07-21 | 2008-11-12 | 上海大学 | Rare earth-containing high-nitrogen ultralow-nickel super-duplex stainless steel alloy materials and method for preparing same |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100457951C (en) * | 2006-09-21 | 2009-02-04 | 上海大学 | High-nitrogen nickel-free bidirectional stainless steel alloy material and manufacture method thereof |
| CN101215674B (en) * | 2008-01-08 | 2010-11-03 | 上海大学 | Economical diphase stainless steel alloy material and preparation method thereof |
| CN101812647B (en) * | 2009-02-25 | 2012-10-10 | 宝山钢铁股份有限公司 | Diphase stainless steel and manufacturing method thereof |
| CN101942611B (en) * | 2010-03-22 | 2012-07-25 | 临沭县华盛化工有限公司 | Alloy pump for conveying chlorine-containing mixed acid liquid |
| CN102660663B (en) * | 2012-05-29 | 2013-12-11 | 天津市东瑞钢铁铸造有限公司 | Method for smelting super third-generation double-phase stainless steel by using intermediate frequency furnace |
| JP5403192B1 (en) | 2012-06-22 | 2014-01-29 | 新日鐵住金株式会社 | Duplex stainless steel |
| CN103060717A (en) * | 2013-01-12 | 2013-04-24 | 上海大学 | Chromium-saved duplex stainless steel with phase-change plasticization effect and preparation method of chromium-saved duplex stainless steel with phase-change plasticization effect |
-
2002
- 2002-11-08 CN CNB021451729A patent/CN1187467C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432262C (en) * | 2006-07-21 | 2008-11-12 | 上海大学 | Rare earth-containing high-nitrogen ultralow-nickel super-duplex stainless steel alloy materials and method for preparing same |
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| Publication number | Publication date |
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| CN1412337A (en) | 2003-04-23 |
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