CN102102166A - Duplex stainless steel with high corrosion resistance and production technology thereof - Google Patents
Duplex stainless steel with high corrosion resistance and production technology thereof Download PDFInfo
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- CN102102166A CN102102166A CN2009102596225A CN200910259622A CN102102166A CN 102102166 A CN102102166 A CN 102102166A CN 2009102596225 A CN2009102596225 A CN 2009102596225A CN 200910259622 A CN200910259622 A CN 200910259622A CN 102102166 A CN102102166 A CN 102102166A
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Abstract
The invention discloses duplex stainless steel with high corrosion resistance. The duplex stainless steel comprises the following components by weight percent: 0.03% or less of C, 0.4-0.7% of Si, 1.4-1.7% of Mn, 0.03% or less of P, 0.001% or less of S, 22.3-22.7% of Cr, 5.6-5.9% of Ni, 3.0-3.2% of Mo, 0.5% or less of Cu, 0.15% or less of Al, 0.0028-0.0043% of B, 0.145-0.175% of N, 0.005% or less of Ti, 0.99% or less of Pb and the balance Fe. The invention also provides a production technology of the duplex stainless steel with high corrosion resistance. The invention has the following advantages: the stainless steel has higher strength and better chloride ion pitting resistance and stress corrosion resistance; and by adopting the production technology, higher product quality can be obtained.
Description
Technical field
The present invention relates to a kind of stainless steel and production technique thereof, relate in particular to a kind of strong corrosion resistant duplex stainless steel and production technique thereof.
Background technology
Along with the sustained and rapid development of domestic heavy chemical industry, industrial equipments demands such as petrochemical complex, seawater and wastewater treatment, oil and gas pipeline are quickened.The operating mode in these fields is very abominable, has various types of strong acid, highly basic, and the erosion resistance and the intensity of equipment has been proposed high requirement.The common Ni-Cr type austenitic stainless steel of present domestic use is easy in order to increase the service life, often increase steel plate thickness in use losing efficacy owing to corroding, and not only causes the equipment heaviness but also has increased cost.
Summary of the invention
Technical problem to be solved by this invention is: a kind of strong corrosion resistant duplex stainless steel is provided.
Another technical problem to be solved by this invention is: provide a kind of strong corrosion resistant duplex stainless steel from smelt, the production technique of rolling, annealing and pickling.Stainless steel by this explained hereafter has extremely strong erosion resistance and excellent mechanical property.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of strong corrosion resistant stainless steel, and its moiety and each composition weight percent (Wt%) are as follows: C :≤0.03; Si:0.4～0.7; Mn:1.4～1.7; P :≤0.03; S :≤0.001; Cr:22.3～22.7; Ni:5.6～5.9; Mo:3.0～3.2; Cu :≤0.5; Al :≤0.15; B:0.0028～0.0043; N:0.145～0.175; Ti :≤0.005; Pb :≤0.99; Surplus is Fe.
The present invention also provides a kind of strong corrosion resistant stainless production technique: at the AOD refining stage, when the temperature of stainless steel water reaches 1705 ± 20 ℃, be blown into O with the hyperbaric oxygen rifle
2, the C content by in the oxygenizement reduction molten steel of oxygen and chromic oxide thereof makes Wt (C)≤0.03%.Decarburization is carried out in the following manner among the AOD:
2[C]+O
2＝2CO↑
4[Cr]+3O
2＝2[Cr
2O
3]
[Cr
2O
3]+3[C]＝2[Cr]+3CO↑
From above-mentioned reaction formula, as can be seen, pass through N
2Can reduce the CO dividing potential drop, protect the chromium purpose thereby can reach carbon drop better.The volume fraction of nitrogen directly influences the hot workability of duplex stainless steel and the performance of the finished product, therefore must accurately control the volume fraction of nitrogen, elements such as Mo, M n, Cr, V, Nb, Ti can reduce nitrogen activity in molten steel, thereby improve the solubleness of nitrogen, make nitrogen content (Wt) be controlled at 0.145～0.175 scope.
γ mutually still is about 30% in 1250～1300 ℃ of following dual phase steels, is in the inductile district, can not realize that the high temperature single phase region is rolling and must finish hot-work in the two-phase region, and the body-centred cubic α of face-centred cubic γ plasticity ratio will get well, and extension differs, and causes cracking easily.Therefore furnace temp generally is controlled at 1320～1350 ℃ of scopes in course of hot rolling, in the operation of rolling, avoids opening the dephosphorize by high pressure water system.
In annealing process, for avoiding the streaky structure that α and γ distribute alternately mutually or σ fragility phase occurs, annealing temperature generally is controlled at 1100～1150 ℃.
Acid cleaning process: duplex stainless steel is because the alloy mass mark is higher, and the oxide structure complexity is not easy pickling.Adopt H in the production technique of the present invention
2SO
4: 220～240g/L, NaCl:30～38g/L, additive: 10～14g/L at 60 ℃ of average pickling 55～60min, makes the surface of steel plate color and luster after the pickling even.
Advantage of the present invention is: by the proportioning and the smelting of chemical element of the present invention, this kind stainless steel has possessed austenite and ferrite respectively accounts for 50% duplex structure, anti-pitting attack indices P REN reaches 43, thereby has higher intensity (yield strength reaches 400-550Mpa), more superior anti-chlorine ion spot corrosion, anticorrosion stress-resistant performance.
Embodiment
Describe the present invention in detail below in conjunction with specific embodiment.
High-corrosion resistant high-strength dual-phase hot-rolled stainless steel strip, its weight percent (Wt%) is: C:0.03; Si:0.4; Mn:1.4; P:0.02; S:0.001; Cr:22.5; Ni:5.6; Mo:3.0; Cu:0.3; Al:0.10; B:0.0028; N:0.150; Ti:0.005; Pb:0.65; Surplus is Fe.
At the AOD refining stage, being blown into oxygen and nitrogen in 1700 ℃ high-temperature molten steel, by the C content in the redoxomorphism reduction molten steel, is to improve nitrogen content in the molten steel, add Mo, the Mn element that nitrogen element activity is reduced in the alloying constituent, make Wt (N) content reach 0.15～0.16%.
At following engineering phase, the process furnace heating and temperature control is extracted out behind the 4H at 1330 ± 5 ℃ heat-up time, forbids opening the dephosphorize by high pressure water device before rolling; When the hot rolled strip of roll forming was sent into downstream annealing, the annealing furnace temperature control was carried out pickling operation: H then at 1120 ± 10 ℃ in following environment
2SO
4: 230～240g/L, NaCl:35～38g/L, additive: 12～14g/L, at 60 ℃ of average pickling 55min, get final product high-quality two-phase stainless roll of steel plate.
Claims (3)
1. strong corrosion resistant duplex stainless steel, it is characterized in that: its moiety and each composition weight percent (Wt%) are as follows: C :≤0.03; Si:0.4～0.7; Mn:1.4～1.7; P :≤0.03; S :≤0.001; Cr:22.3～22.7; Ni:5.6～5.9; Mo:3.0～3.2; Cu :≤0.5; Al :≤0.15; B:0.0028～0.0043; N:0.145～0.175; Ti :≤0.005; Pb :≤0.99; Surplus is Fe.
2. strong corrosion resistant duplex stainless steel as claimed in claim 1, austenite and ferrite respectively account for 50% duplex structure, and anti-pitting attack indices P REN reaches 43, and yield strength reaches 400-550Mpa.
3. strong corrosion resistant duplex stainless steel as claimed in claim 1, its production technique comprise the steps: to be blown into O in 1705 ± 20 ℃ the high-temperature molten steel
2And nitrogen, reduce C content in the composition by principle of oxidation and reduction, simultaneously, add Mo, Mn, Cr, V, elements such as Nb, Ti, to improve the N content in the composition; Rolling sequence, furnace temp are controlled at 1320～1350 ℃ of scopes, in the operation of rolling, avoid opening the dephosphorize by high pressure water system; Annealing temperature generally is controlled at 1100～1150 ℃; Acid cleaning process adopts H
2SO
4: 220～240g/L, NaCl:30～38g/L, additive: 10～14g/L is at 60 ℃ of average pickling 55～60min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102596225A CN102102166A (en) | 2009-12-18 | 2009-12-18 | Duplex stainless steel with high corrosion resistance and production technology thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102596225A CN102102166A (en) | 2009-12-18 | 2009-12-18 | Duplex stainless steel with high corrosion resistance and production technology thereof |
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|---|---|
| CN102102166A true CN102102166A (en) | 2011-06-22 |
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| CN2009102596225A Pending CN102102166A (en) | 2009-12-18 | 2009-12-18 | Duplex stainless steel with high corrosion resistance and production technology thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104870675A (en) * | 2012-12-17 | 2015-08-26 | 杰富意钢铁株式会社 | Stainless steel sheet and stainless steel foil |
| CN106636944A (en) * | 2016-12-27 | 2017-05-10 | 柳州市金岭汽车配件厂 | Vehicle door sill pedal and preparation method thereof |
| CN106957998A (en) * | 2016-01-11 | 2017-07-18 | 无锡市法兰锻造有限公司 | The flange forge piece and its production technology of a kind of dual phase steel material |
| CN107937825A (en) * | 2017-11-15 | 2018-04-20 | 江阴方圆环锻法兰有限公司 | Oil gas dual phase steel valve forging and its forging method |
| CN108239727A (en) * | 2016-12-23 | 2018-07-03 | 株式会社Posco | Two phase stainless steel and its manufacturing method with excellent anticorrosive |
| CN110016625A (en) * | 2019-05-15 | 2019-07-16 | 丹阳市华龙特钢有限公司 | High-purity anti-corrosive alloy material |
| CN110983164A (en) * | 2019-12-31 | 2020-04-10 | 福州大学 | Microalloy element Nb-reinforced duplex stainless steel and preparation method thereof |
-
2009
- 2009-12-18 CN CN2009102596225A patent/CN102102166A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104870675A (en) * | 2012-12-17 | 2015-08-26 | 杰富意钢铁株式会社 | Stainless steel sheet and stainless steel foil |
| US9777357B2 (en) | 2012-12-17 | 2017-10-03 | Jfe Steel Corporation | Stainless steel foil |
| CN106957998A (en) * | 2016-01-11 | 2017-07-18 | 无锡市法兰锻造有限公司 | The flange forge piece and its production technology of a kind of dual phase steel material |
| CN108239727A (en) * | 2016-12-23 | 2018-07-03 | 株式会社Posco | Two phase stainless steel and its manufacturing method with excellent anticorrosive |
| CN106636944A (en) * | 2016-12-27 | 2017-05-10 | 柳州市金岭汽车配件厂 | Vehicle door sill pedal and preparation method thereof |
| CN107937825A (en) * | 2017-11-15 | 2018-04-20 | 江阴方圆环锻法兰有限公司 | Oil gas dual phase steel valve forging and its forging method |
| CN110016625A (en) * | 2019-05-15 | 2019-07-16 | 丹阳市华龙特钢有限公司 | High-purity anti-corrosive alloy material |
| CN110016625B (en) * | 2019-05-15 | 2021-08-03 | 丹阳市华龙特钢有限公司 | High-purity corrosion-resistant alloy material |
| CN110983164A (en) * | 2019-12-31 | 2020-04-10 | 福州大学 | Microalloy element Nb-reinforced duplex stainless steel and preparation method thereof |
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Application publication date: 20110622 |