CN1111613C - High-silicon austenite stainless steel resisting concentrated and dilute nitric acid corrosition - Google Patents
High-silicon austenite stainless steel resisting concentrated and dilute nitric acid corrosition Download PDFInfo
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- CN1111613C CN1111613C CN 00100448 CN00100448A CN1111613C CN 1111613 C CN1111613 C CN 1111613C CN 00100448 CN00100448 CN 00100448 CN 00100448 A CN00100448 A CN 00100448A CN 1111613 C CN1111613 C CN 1111613C
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Abstract
The present invention relates to high-silicon austenitic stainless steel resisting the corrosion of concentrated and dilute nitric acid, which is composed of the following components of the percentage by weight: 0.01 to 0.03 wt% of C, 0.5 to 2 wt% of Mn, 3 to 6 wt% of Si, 8 to 20 wt% of Cr, 12 to 24 wt% of Ni, 0.001 to 0.06 wt% of Re or Mg, and Fe as the rest. The stainless steel of the present invention can resist the corrosion of concentrated and dilute nitric acid, and the hot-working property of the present invention (particularly the hot-piercing property of the present invention) is obviously improved. The stainless steel of the present invention is suitable for manufacturing a device and a pipe casting used by producing concentrated nitric acid in an indirect method, and can be used for manufacturing a device and a pipe casting used by producing concentrated nitric acid in other methods.
Description
The present invention relates to a kind of austenitic stainless steel, especially a kind of anti-dense, rare nitric acid corrosive high-silicon austenite stainless steel.
The prior art situation is:
One, domestic and international concentrated nitric acid production austenitic stainless steel, promptly make the production equipment that contacts with concentrated nitric acid, pipe fitting etc. with this stainless steel, this class stainless steel can be divided into two kinds of base types substantially: the first kind is not add any stabilizing element, is representative with the USSR (Union of Soviet Socialist Republics), as
Π 794 steel (referring to " MHToM ", N0.5,30-32,1976).The shortcoming of this steel is that its sensitization attitude intergranular corrosion is serious, the welding zone poor toughness;
Second class is to add stabilizing element, comprises Ti, Ta, Zr, Nb in the stable element, and is at least a.The NAR-SN series that this class steel is produced with Japanese stainless steel company is that representative is (referring to " Japanese ス テ Application レ ス skill newspaper ", NO.12,1-53,1976; NO.17,1-22,1982).Because of high silicon stainless steel is sayed, the interpolation of stabilizing elements such as Nb, Ti can produce fragility G phase, and its hot-work and welding property degenerate.As C
2The NAR-SN-1 steel that steel and Japan produce only supplies sheet material, does not supply weldless steel tube, because tubing adds man-hour, the poling difficulty is very big, and scrap rate is too high, so do not produce tubing.In addition, NAR-SN-3 steel weld seam impact resistance value is extremely low.
Two, the method for industrial production concentrated nitric acid has and directly (synthesizes) method and indirect (dehydration) method etc.The external general sulfuric acid that adopts of indirect method is made dewatering agent, and China begins to adopt alone magnesium nitrate (dewatering agent) method from the mid-1960s, and advantage is a lot, and development rapidly.But because of ambient condition than direct method complexity, seriously corroded.Especially the start-stop car all has a rare nitre process, and original process unit material therefor mainly is a high silicon cast iron (matter is crisp) etc.Still do not have a kind of not only anti-concentrated nitric acid corrosion but also have better anti-rare nitric acid causticity energy and the good stainless material of over-all properties.
The purpose of this invention is to provide a kind of anti-dense and rare nitric acid corrosive high-silicon austenite stainless steel, this steel is suitable for indirect evaporation and produces concentrated nitric acid usefulness, be used for anti-dense and rare nitric acid, for example when producing concentrated nitric acid, with this steel as device with material or forge piece weldless steel tube particularly, both ability concentrated nitric acid corrosion, again can the dilution nitric acid process when the start-stop car in, the corrosion of anti-rare nitric acid.Also have mechanical property, forge good comprehensive performances such as lumber recovery.To guarantee the smooth production of this concentrated nitric acid.
The present invention realizes by following technical scheme.This anti-dense rare nitric acid corrosive high-silicon austenite stainless steel is made up of following compositions in weight percentage:
C 0.01-0.03 Mn 0.5-2 Si 4-6 Cr 8-20
Ni 12-24 (Re or Mg 0.001-0.06)
Surplus is that Fe adds to 100.
In each component, suitably increase or reduce some components or content, to improve its anti-corrosion, hot workability.Be described as follows:
1, suitably improves Cr content, to improve anti-rare nitric acid causticity energy under some environment.Because of the main Si of dependence of anti-concentrated nitric acid corrosion element forms the passivation protection film, and the main passivation element that relies on of anti-rare nitric acid corrosion is that Cr is not Si.In the present invention, Cr content is generally than C
4Steel improves 2-6%, and Si content reduces relatively.
2, do not add stabilizing element, avoid the formation of fragility G phase, to improve its hot workability.
3, add useful micro alloying elements such as Re or Mg, further improve particularly hot piercing performance of hot workability and can improve the forging lumber recovery, can improve as the KY706 steel and forge lumber recovery 20～40%.
4, reduce C content.At general C content is on 0.03% basis, drops to below 0.02%, to improve anti-sensitization attitude intergranular corrosion performance.
The present invention is on the corrosive of anti-concentrated nitric acid high silicon stainless steel basis in sum, suitably improve the content of chromium to improve its anti-rare nitric acid causticity energy, make its not only anti-concentrated nitric acid but also anti-rare nitric acid corrosion, be applied to magnesium nitrate (dewatering agent) method with this steel, reduced the corrosion of rare nitric acid, assurance device runs well.In addition, by not using stabilizing element to add useful trace alloying elements such as Re, Mg, further improve hot workability, the hot piercing performance of tubulation particularly, the processing of consumption is very big when being beneficial to concentrated nitric acid production steel pipe, container and web member is to guarantee to produce with magnesium nitric acid process the wearing quality of concentrated nitric acid equipment therefor.Because the improvement of hot workability makes being produced on of steel pipe technical and all feasible economically, thoroughly changed indirect method and had only high silicon cast iron, rafifinal and three kinds of passive situations of 1Cr18Ni9Ti over more than 30 year, enriched the range of choice of various dense nitre productions with material with material.In addition, the content that reduces C also can improve the anti intercrystalline corrosion performance.Stainless steel of the present invention is produced the concentrated nitric acid except that being suitable for magnesium nitric acid process, also can be used for making other anti-dense rare nitric acid corrosive container, pipeline, web member, casting forging product etc.
Do concrete introduction with embodiment below,
The present invention implements with high-silicon austenite stainless steel with the anti-nitric acid corrosion of commodity KY series by name in the middle of implementing, and effect is remarkable.
Embodiment 1 KY704 stainless steel
(1) composition (weight percentage)
C 0.012 Mn 0.8 Si 4 Cr 16 Ni 14 Re 0.022
Surplus is Fe (adding to 100)
(2) technological process (is example the to produce seamless tube) tube-making process of stainless steel tube routinely is promptly by the starting material → smeltings → forging → rolling → hot piercing of said ratio → lubricate → cold rolling+cold-drawn → annealing aligning → pickling → crop end → check → warehouse-in.
But by the difficult in the past weldless steel tube of producing of above technology ordinary production, the lumber recovery height, cost greatly reduces.
Embodiment 2 KY706 stainless steels
(1) composition (weight percentage)
C 0.02 Mn 0.8 Si 5 Cr 19 Ni 21 Mg 0.022
Surplus is Fe (adding to 100)
(2) technical process with common process produce common forging, stocking is an example
Batching → smelting (induction furnace or external refining method) → cast electroslag bar → electric slag refusion ingot → abrasive cleaning surface → hammer cogging → moulding or hot rolling → solution heat treatment → check → warehouse-in.
The anti-dense rare nitric acid corrosion high-silicon austenite stainless steel of above-mentioned two kinds of KY series making by the technology of the present invention, its performance index and most widely used 1Cr18Ni9Ti stainless steel are to such as table 1.
Each stainless steel performance comparison table 1
| Performance index (supply of material attitude) | 1Cr18Ni9Ti | KY704 | KY706 | Note | |
| σ b(MPa) | ≥539 | ≥540 | ≥600 | ||
| δ 5(％) | ≥40 | ≥40 | ≥35 | ||
| Corrosion-resistant 98%HNO 3(millimeter/year) | 50℃ | ＞5 | ＜0.1 | ＜0.1 | |
| Boiling temperature | ＞10 | ≤0.5 | ＜0.5 | ||
| Corrosion-resistant 65%HNO 3(millimeter/year) | 50℃ | ＜0.1 | ＜0.1 | ＜0.1 | |
| Boiling temperature | ＜1.0 | ＜1.0 | ＜1.0 | ||
| Forge lumber recovery (%) | ～80 | 75～80 | 60～80 | ||
Classify stainless-steel K Y704 of the present invention, KY706 and the stainless various main performance index of 1Cr18Ni9Ti as table 1.Can see the σ of KY704, KY706
bValue is all greater than the 1Cr18Ni9Ti steel.At δ
5On the value, KY706 is slightly identical with it for low KY704 than 1Cr18Ni9Ti.On the corrosion index of anti-the concentrated nitric acid, KY704 then of the present invention, KY706 stainless steel are much better than 1Cr18Ni9Ti.In anti-rare nitric acid corrosion, stainless-steel K Y704 of the present invention, KY706 are identical with 1Cr18Ni9Ti.And on the lumber recovery index, steel then of the present invention because of high silicone content a little less than 1Cr18Ni9Ti.
Claims (1)
1, high-silicon austenite stainless steel is used in anti-dense rare nitric acid corrosion, it is characterized in that it is made up of following compositions in weight percentage:
C 0.01-0.03 Mn 0.5-2 Si 4-6 Cr 8-20
Ni 12-24 Re or Mg 0.001-0.06
Surplus is that Fe adds to 100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00100448 CN1111613C (en) | 2000-02-01 | 2000-02-01 | High-silicon austenite stainless steel resisting concentrated and dilute nitric acid corrosition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00100448 CN1111613C (en) | 2000-02-01 | 2000-02-01 | High-silicon austenite stainless steel resisting concentrated and dilute nitric acid corrosition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1307141A CN1307141A (en) | 2001-08-08 |
| CN1111613C true CN1111613C (en) | 2003-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 00100448 Expired - Lifetime CN1111613C (en) | 2000-02-01 | 2000-02-01 | High-silicon austenite stainless steel resisting concentrated and dilute nitric acid corrosition |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5003151B2 (en) * | 2006-12-28 | 2012-08-15 | 住友金属工業株式会社 | Manufacturing method of seamless steel pipe made of high Cr-high Ni base alloy steel |
| CN103842547B (en) * | 2011-07-29 | 2016-09-14 | 新日铁住金株式会社 | The manufacture method of high Si austenite stainless steel |
| CN104109820A (en) * | 2014-07-29 | 2014-10-22 | 山东雅百特金属结构系统有限公司 | Novel metal roofing board material |
| CN106756628A (en) * | 2017-01-06 | 2017-05-31 | 江苏星火特钢有限公司 | A kind of silicon nitrogenous austenitic stainless steel high and preparation method thereof |
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2000
- 2000-02-01 CN CN 00100448 patent/CN1111613C/en not_active Expired - Lifetime
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| Publication number | Publication date |
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| CN1307141A (en) | 2001-08-08 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Huzhou Fengtai Stainless Steel Pipe Co., Ltd. Assignor: Keye Steel Products Co., Ltd., Beijing Contract fulfillment period: 2005.7.5 to 2015.7.4 Contract record no.: 2008330002056 Denomination of invention: High-silicon austenite stainless steel resisting concentrated and dilute nitric acid corrosition Granted publication date: 20030618 License type: Exclusive license Record date: 20081117 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2005.7.5 TO 2015.7.4; CHANGE OF CONTRACT Name of requester: HUZHOU FENGTAI STAINLESS STEEL PIPE CO., LTD. Effective date: 20081117 |
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