CN1057135C - High corrosion-resisting austenite stainless steel - Google Patents
High corrosion-resisting austenite stainless steel Download PDFInfo
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- CN1057135C CN1057135C CN95113316A CN95113316A CN1057135C CN 1057135 C CN1057135 C CN 1057135C CN 95113316 A CN95113316 A CN 95113316A CN 95113316 A CN95113316 A CN 95113316A CN 1057135 C CN1057135 C CN 1057135C
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- high corrosion
- austenitic stainless
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Abstract
The present invention relates to iron-base alloy, and has the aim to provide novel high corrosion resistant austenite stainless steel which improves the corrosion resistance of austenitic stainless steel. The stainless steel formula of the present invention mainly adds elements, such as niobium (Nb) and rare earth (RE) by taking the existing austenitic stainless steel as a base. Because the present invention adopts the method that extra-low carbon stainless steel is added with the Nb, and makes the Nb preferably processed with chemical combination to be formed into columbium carbide (Nbc), the generation of chromium depletion regions from being formed into Cr23C6 is avoided, and therefore, the corrosion resistance of crystal boundary is increased.
Description
The present invention relates to a kind of ferrous alloy.
In recent years, along with the development of each branch of industry such as chemical industry, nuclear industry, oil production, the environment for use of metallic substance is variation, harshnessization more and more.In harsh like this corrosive environment, the corrosion-resistant material that with the stainless steel is representative is adopted gradually in a large number, but in such environment, often produce the corrosion accident of various forms such as pitting, crevice corrosion, stress corrosion cracking, intergranular corrosion, general corrosion, thereby cause enormous economic loss.Austenitic stainless steel corrosion stability problem mainly is local corrosions such as anti-spot corrosion, intergranular corrosion and stress corrosion.And no matter be that local corrosions such as spot corrosion, intergranular corrosion and stress corrosion are often at first from crystal boundary.Because crystal boundary exists poor chromium district.Therefore, the height of crystal boundary resistance to corrosion just becomes the standard of this steel grade resistance to corrosion height.And from microcosmic, as long as in steel, there is carbon, even Ultralow Carbon Stainless Steel, since the supersaturation of partial area carbon, the carbide (Cr that from austenite, is settled out
23C
6) be inevitable.So, because carbide (Cr
23C
6) precipitation to cause near the poor chromium district the crystal boundary of partial area also be inevitable.Therefore, corrosion is inevitable.
The objective of the invention is to prepare a kind of novel highly corrosion resistant austenitic stainless steel, it has improved the antiseptic property of austenitic stainless steel.
00Cr of the present invention
20Ni
18Mo
6The chemical constitution of NbCuNRE austenitic stainless steel is that (weight %): C is≤0.03%, and Mn is≤1.00%, and S is≤0.020%, P is≤0.030%, Si is≤1.00%, and Cr is 19.00%～24.00%, and Ni is 17.00%～22.00%, Mo is 5.00%～7.00%, Nb is 0＜Nb≤3.00%, and Cu is≤3.00%, and N is 0.10%～0.30%, RE is 0＜RE≤0.10%, and all the other are Fe.
Stainless steel prescription of the present invention mainly is to have added Nb, RE element on the basis of existing austenitic stainless steel, because crystal grain has obtained refinement, improved the erosion resistance of the present invention in corrosive medium (dilute sulphuric acid, acetic acid), and improved stainless processing characteristics, made the more easy to control and realization of smelting, cold and hot working and thermal treatment process.Stainless lumber recovery of the present invention does not have much difference with general stainless steel.The technology of austenitic stainless steel of the present invention is: proportion ingredient → medium-frequency induction furnace → antivacuum electroslag furnace → forge and make (1250 ℃～1070 ℃) → finishing (planing) → hot rolling (1250 ℃～1070 ℃) → solid solution → pickling (polishing) → cold rolling becoming a useful person according to chemical composition.Thermal treatment (solution treatment) technology is: 1100 ℃ of 1h, water-cooled.Or proportion ingredient → electric arc furnace → VOD stove → forge and make (1250 ℃～1070 ℃) → finishing (planing) → hot rolling (1250 ℃～1070 ℃) → solid solution → pickling (polishing) → cold rolling becoming a useful person according to chemical composition.Thermal treatment (solution treatment) technology is: 1100 ℃ of 1h, water-cooled.
The present invention adds niobium (Nb) and rare earth (RE) owing to having adopted in Ultralow Carbon Stainless Steel, make the preferential chemical combination of Nb and carbon, forms niobium carbide (NbC), and rare earth generates rare earth oxysulfide, has avoided formation Cr
23C
6And cause poor chromium district, and sulfide significantly reduces.Therefore the resistance to corrosion of crystal boundary just is improved.The performance of the present invention and SMO254 austenitic stainless steel is compared as follows: 1. critical crevice corrosion temperature:
2. critical pitting temperature:
3. pitting potential: (3.5%NaCl solution)
4. at 24%H
2SO
4With the corrosion rate in the 2.5%HCHO mixing solutions:
5. mechanical property:
| SMO254 | The present invention | |
| Temperature | 20℃ | 26℃ |
| Yield strength (min) σ0.2N/mm 2 | 300Mpa | 390Mpa |
| Tensile strength (min) σbN/mm 2 | 650Mpa | 780Mpa |
| Unit elongation (min) A5% | 35 | 40 |
| Impelling strength (Vmin) J/cm 2 | 120 | 275 |
| Hardness HB (max) | 220 | 220 |
Claims (1)
1. a high corrosion-resisting austenite stainless steel is made up of chromium, nickel, molybdenum, niobium, copper, nitrogen, rare earth, it is characterized in that: 00Cr
20Ni
18Mo
6The chemical constitution of NbCuNRE austenitic stainless steel (weight %) is: C is≤0.03%, and Mn is≤1.00%, and S is≤0.020%, P is≤0.030%, Si is≤1.00%, and Cr is 19.00%～24.00%, and Ni is 17.00%～22.00%, Mo is 5.00%～7.00%, Nb is 0＜Nb≤3.00%, and Cu is≤3.00%, and N is 0.10%～0.30%, RE is 0＜RE≤0.10%, and all the other are Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95113316A CN1057135C (en) | 1995-10-25 | 1995-10-25 | High corrosion-resisting austenite stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95113316A CN1057135C (en) | 1995-10-25 | 1995-10-25 | High corrosion-resisting austenite stainless steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1148635A CN1148635A (en) | 1997-04-30 |
| CN1057135C true CN1057135C (en) | 2000-10-04 |
Family
ID=5079932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95113316A Expired - Fee Related CN1057135C (en) | 1995-10-25 | 1995-10-25 | High corrosion-resisting austenite stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1057135C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775551A (en) * | 2010-03-09 | 2010-07-14 | 江苏亚盛金属制品有限公司 | Manufacture method of novel marine corrosion resistance stainless steel and steel cable thereof |
| CN102021500B (en) * | 2010-12-21 | 2012-12-26 | 重庆仪表材料研究所 | Novel super austenite 6Mo type stainless steel |
| CN103014552A (en) * | 2011-09-22 | 2013-04-03 | 兴化市新迅达不锈钢标准件有限公司 | Novel corrosion-resisting special fastener |
| CN104962836A (en) * | 2015-06-05 | 2015-10-07 | 山西太钢不锈钢股份有限公司 | Corrosion-resistance iron-based austenite oil well pipe and manufacturing method thereof |
| CN106275221A (en) * | 2016-08-18 | 2017-01-04 | 赵登强 | High-strength intelligent bicycle pedal |
| CN107058905B (en) * | 2016-12-27 | 2019-09-20 | 振石集团东方特钢有限公司 | A kind of super austenitic stainless steel and preparation method thereof |
| CN107747068B (en) * | 2017-10-20 | 2018-10-19 | 山西太钢不锈钢股份有限公司 | A kind of heat-resistance stainless steel seamless pipe and preparation method thereof |
| CN108642409A (en) * | 2018-05-08 | 2018-10-12 | 江苏理工学院 | A kind of corrosion-resistant super austenitic stainless steel and its manufacturing process |
| CN110093558A (en) * | 2019-04-13 | 2019-08-06 | 安徽苏立科技股份有限公司 | A kind of addition Nb element stainless steel electrothermal tube and its manufacturing process |
| CN111560566A (en) * | 2020-05-18 | 2020-08-21 | 江苏京成机械制造有限公司 | Corrosion-resistant alloy material and desulfurization pipe fitting based on same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4341555A (en) * | 1980-03-31 | 1982-07-27 | Armco Inc. | High strength austenitic stainless steel exhibiting freedom from embrittlement |
-
1995
- 1995-10-25 CN CN95113316A patent/CN1057135C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4341555A (en) * | 1980-03-31 | 1982-07-27 | Armco Inc. | High strength austenitic stainless steel exhibiting freedom from embrittlement |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1148635A (en) | 1997-04-30 |
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