CN102363870A - Austenitic stainless steel for manufacturing steel tube and manufacturing method thereof - Google Patents
Austenitic stainless steel for manufacturing steel tube and manufacturing method thereof Download PDFInfo
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- CN102363870A CN102363870A CN2011103062805A CN201110306280A CN102363870A CN 102363870 A CN102363870 A CN 102363870A CN 2011103062805 A CN2011103062805 A CN 2011103062805A CN 201110306280 A CN201110306280 A CN 201110306280A CN 102363870 A CN102363870 A CN 102363870A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 62
- 239000010959 steel Substances 0.000 title claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 13
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 15
- 239000010935 stainless steel Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 44
- 230000008569 process Effects 0.000 claims description 21
- 238000005554 pickling Methods 0.000 claims description 18
- 238000009749 continuous casting Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000005098 hot rolling Methods 0.000 claims description 12
- 238000007669 thermal treatment Methods 0.000 claims description 10
- 238000005097 cold rolling Methods 0.000 claims description 9
- 238000000137 annealing Methods 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000004512 die casting Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- 235000007164 Oryza sativa Nutrition 0.000 claims 1
- 235000009566 rice Nutrition 0.000 claims 1
- 229910052759 nickel Inorganic materials 0.000 abstract description 6
- 229910052804 chromium Inorganic materials 0.000 abstract description 3
- 229910052748 manganese Inorganic materials 0.000 abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010248 power generation Methods 0.000 abstract 1
- 230000001737 promoting effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 15
- 238000005096 rolling process Methods 0.000 description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 9
- 239000011651 chromium Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- NGNBDVOYPDDBFK-UHFFFAOYSA-N 2-[2,4-di(pentan-2-yl)phenoxy]acetyl chloride Chemical compound CCCC(C)C1=CC=C(OCC(Cl)=O)C(C(C)CCC)=C1 NGNBDVOYPDDBFK-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses an austenitic stainless steel for manufacturing a steel tube and a manufacturing method thereof. The austenitic stainless steel comprises the following chemical components in percentage by weight: 0.05-0.08 percent of C, 0.4-0.8 percent of Si, 0.7-1.0 percent of Mn, less than or equal to 0.04 percent of P, less than or equal to 0.03 percent of S, 18.0-19.0 percent of Cr, 7.0-8.0 percent of Ni, 0.08-0.12 percent of V, 0.15-0.25 percent of N and the balance of Fe and inevitable impurities. The austenitic series stainless steel can be used as a raw material of a steel tube used in a superheater and a reheater of a boiler, a reaction furnace tube for chemical industry and the like, and a steel plate, bar steel, forged steel and the like used as a heat-resistant and pressure-resistant component, and has an extremely great effect on promoting high temperature and high pressure of the boiler for power generation and the like.
Description
Technical field
The present invention relates to the alloy field, relate to stainless steel particularly, relate more specifically to a kind of method of manufacture and method of manufacture thereof that is used to make the austenitic stainless steel of steel pipe.
Background technology
Stainless steel is with good solidity to corrosion, high thermal resistance, and high-strong toughness, exquisite appearance and good characteristics such as processing forming are widely used in that food machinery, sanitary facility, kitchen, building dress are drilled, aspects such as automobile, chemical industry and electric equipment products.In stainless steel market, the demand of stainless steel materials accounts for more than 80%, and this wherein main product is the stainless-steel cold-rolling thin plate.
The production technique of traditional Stainless Steel Band is by continuous casting (or mould notes+forging), and hot rolling and cold rolling process are accomplished.The thickness of strand is 200mm in general traditional continuous casting process.Stainless hot rolling production technique has two kinds of continous way hot strip rolling mill and modern Steckel mills.These two kinds of production technique were identical at roughing mill in the past.Mostly the cross dimensions of steel billet is (180-200mm) * (1050-2550) two.Steel billet heats at walking beam heating furnace.The steel billet of coming out of the stove is back and forth rolling through carrying out the 5-7 passage at the four roller reversible roughing mills that have edger roll behind the dephosphorize by high pressure water, is rolled down to 30-50mm, sends into finishing train or Steckel mill, is rolled down to finished product thickness, accomplishes the hot rolling production process of band steel.The production technique of stainless-steel cold-rolling band steel is mainly to be softening and removal iron scale processing at the enterprising row of hot rolled strip continuous annealing pickling unit.Carry out cold rollingly then, the band steel after cold rolling carries out recrystallize softening annealing and pickling at cold-rolled steel strip continuous annealing pickling unit; The finished product cold rolled strip improves plate shape through smooth unit, through rip cutting (coil of strip delivery) or crosscut (spiral-plate delivery) unit, accomplishes the production of cold rolled strip.
Above-mentioned is the production technique of traditional stainless steel strip.At eighties of last century beginning of the nineties at the end of the eighties; Compact band steel production technique (Compact Strip Production; Be called for short CSP) at first obtain commercialization in U.S. Niu Ke company; It is characterized by CSP, technical process is: electric furnace or converter provide molten steel one continuous casting-soaking pit soaking-hot continuous rolling-batch.Along with the development of thin plate blank continuously casting and continuously rolling technology, stainless steel also can be produced with continuous casting and rolling technique of sheet bar.This technology is compared maximum characteristics with traditional technology be that the slab thickness of continuous casting is 50-90mm, because original strand is thin, the hot rolling unit does not need roughing mill (if the thick 50mm of base), or only needs 1 roughing mill (the thick 70-90mm of base).And roughing mill will roll several passages repeatedly and could strand be thinned to the specification that needs before the finish rolling in the traditional technology.Strand is wanted reheat after overcooling earlier in the traditional technology in addition, advance roughing mill again, and strand is directly rolling without cooling in the continuous casting and rolling technique of sheet bar, so the soaking pit before the hot rolling unit only need be mended temperature.Therefore this technology has shortened flow process greatly than above-mentioned traditional technology, has reduced energy consumption, has saved the energy.
The continuous casting technology that upgrades than CSP is strip continuous casting technology (Strip Casting Process); The principal feature of its production technique is exactly molten steel has the circulation cooling effect through a pair of inside a casting roller; Through Quench, solidify back direct pouring and go out the thick Cast Strip of 1-5mm, rolling is batched after through the online hot rolling of a time (or not having hot rolling) in the Cast Strip.Sheet-band continuous casting and rolling technology can be simplified production technique to a greater degree, shortens the production cycle, obviously reduce energy consumption and production costs.
Simultaneously; Because thin strap continuous casting is all different with traditional flow process and bar strip continuous casting and rolling flow path at aspects such as the process of setting characteristic of metallurgical technology flow process, material, phase transformation history; The material of producing; Its tissue has been compared self distinct feature with traditional technology with CSP technology with performance; The basic characteristics that its setting rate is fast, composition is even, degree of segregation is little, crystal grain is tiny bring optimistic prospect for the investigation of materials worker, and some steel grades of producing high alloy content, the easy generation of traditional technology segregation with it have special advantages.
Summary of the invention
Deficiency to prior art; One of the object of the invention is to provide a kind of method of manufacture and method of manufacture thereof that is used to make the austenitic stainless steel of steel pipe, thereby can remedy the shortcoming of prior art, simplifies production technique; Shorten the production cycle; Reduce martensitic content in the product, improve the erosion resistance of steel, make the unit elongation can be greater than 25%.
A kind of austenitic stainless steel that is used to make steel pipe that the present invention is prepared is characterized in that its composition is by weight percentage: C 0.05%-0.08%, Si 0.4%-0.8%; Mn 0.7%-1.0%, P≤0.04%, S≤0.03%; Cr 18.0%-19.0%, Ni 7.0%-8.0%, V 0.08%-0.12%; N 0.15%-0.25%, surplus is Fe and unavoidable impurities.
C is a kind of interstitial element, can significantly improve the intensity of steel through solution strengthening, forms and stable austenite and enlarge the austenitic area.But C combines to form Cr with chromium in the steel under some conditions
23C
6The type carbide, the solidity to corrosion that makes steel is the intergranular corrosion resistance degradation particularly.Therefore to control the content of carbon.
Si is a kind of deoxidant element, but can significantly improve the intergranular corrosion susceptibility of steel in the solid solution attitude.Therefore, Si content is defined as 0.4-0.8%.
Mn is the element of strong stable austenite, can improve the intensity of steel and improve the thermoplasticity of steel.But excessive Mn reduces formability and weldableness.Therefore, Mn content is defined as 0.7%-1.0%.
Cr is the forming element of ferritic phase, improve the performance of steel scale resistance medium and acid chloride medium, but excessive Cr causes stainless fragility.Therefore, Cr is defined as 18.0-19.0%.
Ni is the element of strong formation and stable austenite and expansion austenite phase region.Along with the increase of nickel content, the intensity of steel reduces and the plasticity raising, helps the cold machine-shaping performance.But nickel reduces the high temperature resistance curability of steel.Therefore, Ni is defined as 7.0%-8.0%.
N improves the intensity of the method for manufacture of the austenitic stainless steel be used to make steel pipe as the solution strengthening element, also can improve the corrosion resistance nature of steel.But N content surpasses heat, cold-workability and the cold formability that reduces steel after 0.25%.Therefore, N is defined as 0.15%-0.25%.
P and S are the unavoidable impurities element, but performance is had adverse influence, should be respectively less than 0.04% and 0.03%.
The aforesaid method of manufacture that is used to make the austenitic stainless steel of steel pipe is characterized in that comprising following steps:
(1) raw material is smelted at vacuum induction furnace or electric furnace-AOD duplex,
(2) die casting or continuous casting become steel billet then;
(3) the steel billet hot rolling in process furnace to casting, TR is 1100-1200 ℃, is rolled into band steel or flat board after the thermal distortion in 1000-1150 ℃ of scope;
(4) annealing and pickling carries out the solution heat treatment in the 1000-1150 ℃ of TR, and heat treatment time is confirmed according to 1-5 minute/mm;
(5) cold rolling, cold roling reduction is not less than 50%;
(6) thermal treatment and pickling, pickling after the thermal treatment of 600-800 ℃ * 1-5 minute.
Embodiment
Embodiment one
(1) with raw material at vacuum induction furnace smelting,
(2) continuous casting becomes steel billet or steel ingot then;
(3) the steel billet hot rolling in process furnace to casting, TR is 1150 ℃, after 1000 ℃ thermal distortion, is rolled into band steel or flat board;
(4) annealing and pickling carries out the solution heat treatment in 1000 ℃ of TRs, and heat treatment time is confirmed according to 3 minutes/mm;
(5) cold rolling, cold roling reduction is not less than 50%;
(6) thermal treatment and pickling, pickling after 600 ℃ * 2 minutes thermal treatment.
On inspection, its tensile strength is 1120MPa, and unit elongation is 26%.
The composition of prepared steel is: C 0.05%, and Si 0.4%, and Mn 0.7%, P≤0.02%, and S≤0.013%, Cr18.0%, Ni 7.0%, and V 0.08%, and N 0.15%, and surplus is Fe and unavoidable impurities.
Adopt the steel billet of the step 2 of mentioned component, steel billet is four angle steel bases, through cold centering, and the process furnace heating, the tapping machine perforation, cutting head cutting tail, aligning forms four angle steel pipes.
Embodiment two
(1) raw material is smelted in electric furnace-AOD duplex,
(2) continuous casting becomes steel billet then;
(3) the steel billet hot rolling in process furnace to casting, TR is 1100 ℃, is rolled into band steel or flat board after the thermal distortion in 1150 ℃ of scopes;
(4) annealing and pickling carries out the solution heat treatment in 1150 ℃ of TRs, and heat treatment time is confirmed according to 5 minutes/mm;
(5) cold rolling, cold roling reduction is not less than 50%;
(6) thermal treatment and pickling, pickling after 700 ℃ * 5 minutes thermal treatment.
On inspection, its tensile strength is 1000MPa, and unit elongation is 30%.
Adopt above-mentioned stainless steel strip or flat board, through curling, welding polishes, Pipe Cutting, and aligning forms stainless-steel pipe.
Embodiment three
(1) raw material is smelted in electric furnace-AOD duplex,
(2) be molded into steel billet then;
(3) the steel billet hot rolling in process furnace to casting, TR is 1200 ℃, is rolled into band steel or flat board after the thermal distortion in 1100 ℃ of scopes;
(4) annealing and pickling carries out the solution heat treatment in 1120 ℃ of TRs, and heat treatment time is confirmed according to 1 minute/mm;
(5) cold rolling, cold roling reduction is not less than 50%;
(6) thermal treatment and pickling, pickling after 800 ℃ * 1 minute thermal treatment.
On inspection, its tensile strength is 1070MPa, and unit elongation is 28%.
The composition of steel is: C 0.08%, and Si 0.8%, and Mn 1.0%, and P 0.04%, and S 0.03%, and Cr 19.0%, and Ni 8.0%, and V 0.12%, and N 0.25%, and surplus is Fe and unavoidable impurities.
Applicant's statement; The present invention explains detailed process equipment of the present invention and technical process through the foregoing description; But the present invention is not limited to above-mentioned detailed process equipment and technical process, does not mean that promptly the present invention must rely on above-mentioned detailed process equipment and technical process could be implemented.The person of ordinary skill in the field should understand, and to any improvement of the present invention, to the interpolation of the equivalence replacement of each raw material of product of the present invention and ancillary component, the selection of concrete mode etc., all drops within protection scope of the present invention and the open scope.
Claims (6)
1. an austenitic stainless steel that is used to make steel pipe is characterized in that its composition is by weight percentage: C0.05%-0.08%, Si0.4%-0.8%; Mn0.7%-1.0%, P≤0.04%, S≤0.03%; Cr18.0%-19.0%, Ni7.0%-8.0%, V 0.08%-0.12%; N 0.15%-0.25%, surplus is Fe and unavoidable impurities.
2. the method for manufacture that is used to make the austenitic stainless steel of steel pipe as claimed in claim 1 is characterized in that comprising following steps:
(1) raw material is smelted at vacuum induction furnace or electric furnace-AOD duplex,
(2) die casting or continuous casting become steel billet then;
(3) the steel billet hot rolling in process furnace to casting, TR is 1100-1200 ℃, is rolled into band steel or flat board after the thermal distortion in 1000-1150 ℃ of scope;
(4) annealing and pickling carries out the solution heat treatment in the 1000-1150 ℃ of TR, and heat treatment time is confirmed according to 1-5 minute/mm;
(5) cold rolling, cold roling reduction is not less than 50%;
(6) thermal treatment and pickling, pickling after the thermal treatment of 600-800 ℃ * 1-5 minute.
3. the method for manufacture that is used to make the austenitic stainless steel of steel pipe as claimed in claim 2 is characterized in that in the said hot-rolled step, the process furnace tapping temperature is 1110-1120 ℃.
4. the method for manufacture that is used to make the austenitic stainless steel of steel pipe as claimed in claim 2 is characterized in that, wants controlled temperature 1468-1483 ℃ in the said continuous casting step, pulling rate be 1.5-2 rice/minute.
5. the method for manufacture of a stainless steel tube, what it adopted is the stainless steel strip or the flat board of the manufacturing of claim 2, through curling, welding polishes, Pipe Cutting, aligning forms.
6. the method for manufacture of a stainless steel tube, what it adopted is the stainless four angle steel bases of claim 1, through cold centering, the process furnace heating, the tapping machine perforation, cutting head cutting tail, aligning forms four angle steel pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110306280.5A CN102363870B (en) | 2011-10-10 | A kind of austenitic stainless steel for manufacturing steel pipe and manufacture method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110306280.5A CN102363870B (en) | 2011-10-10 | A kind of austenitic stainless steel for manufacturing steel pipe and manufacture method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102363870A true CN102363870A (en) | 2012-02-29 |
| CN102363870B CN102363870B (en) | 2016-11-30 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103382539A (en) * | 2013-06-25 | 2013-11-06 | 宁波宝新不锈钢有限公司 | Formula and preparation method for stainless steel used for inner container of solar water heater |
| CN104439949A (en) * | 2014-11-13 | 2015-03-25 | 江苏省常熟环通实业有限公司 | Lengthened welded steel tube manufacturing method |
| CN105051233A (en) * | 2013-03-28 | 2015-11-11 | 新日铁住金不锈钢株式会社 | Heat-resistant austenitic stainless steel sheet |
| CN107868860A (en) * | 2016-09-26 | 2018-04-03 | 天津大学 | The method that niobium carbide separates out in TP347H austenitic steels is adjusted using cold-rolling deformation |
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| CN101328565A (en) * | 2007-06-22 | 2008-12-24 | 宝山钢铁股份有限公司 | Low nickle type austenitic stainless steel and manufacturing method thereof |
| CN101633999A (en) * | 2009-05-26 | 2010-01-27 | 山西太钢不锈钢股份有限公司 | Austenitic stainless steel, steel tube thereof and manufacturing method thereof |
| CN101784687A (en) * | 2007-10-03 | 2010-07-21 | 住友金属工业株式会社 | Austenitic stainless steel |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101328565A (en) * | 2007-06-22 | 2008-12-24 | 宝山钢铁股份有限公司 | Low nickle type austenitic stainless steel and manufacturing method thereof |
| CN101784687A (en) * | 2007-10-03 | 2010-07-21 | 住友金属工业株式会社 | Austenitic stainless steel |
| CN101633999A (en) * | 2009-05-26 | 2010-01-27 | 山西太钢不锈钢股份有限公司 | Austenitic stainless steel, steel tube thereof and manufacturing method thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105051233A (en) * | 2013-03-28 | 2015-11-11 | 新日铁住金不锈钢株式会社 | Heat-resistant austenitic stainless steel sheet |
| CN105051233B (en) * | 2013-03-28 | 2017-03-08 | 新日铁住金不锈钢株式会社 | Heat-resisting austenite stainless steel plate |
| US9945016B2 (en) | 2013-03-28 | 2018-04-17 | Nippon Steel & Sumikin Stainless Steel Corporation | Heat-resistant austenitic stainless steel sheet |
| CN103382539A (en) * | 2013-06-25 | 2013-11-06 | 宁波宝新不锈钢有限公司 | Formula and preparation method for stainless steel used for inner container of solar water heater |
| CN104439949A (en) * | 2014-11-13 | 2015-03-25 | 江苏省常熟环通实业有限公司 | Lengthened welded steel tube manufacturing method |
| CN107868860A (en) * | 2016-09-26 | 2018-04-03 | 天津大学 | The method that niobium carbide separates out in TP347H austenitic steels is adjusted using cold-rolling deformation |
| CN107868860B (en) * | 2016-09-26 | 2019-11-01 | 天津大学 | The method being precipitated using niobium carbide in cold-rolling deformation adjustment TP347H austenitic steel |
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Effective date of registration: 20170525 Address after: 323400, Lishui, Zhejiang province Songyang County West screen Street 227 Rui Yang Road Patentee after: Zhejiang Longda Stainless Steel Co. Ltd. Address before: 266000 Licang, Qingdao, No. nine East water road, No. 320, No. Patentee before: Gu Yukui |
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Effective date of registration: 20190816 Address after: Room 1707, 1065 Shanxi Road, Changning District, Shanghai 200051 Patentee after: Shanghai MacMach Investment Management Co., Ltd. Address before: 323400, Lishui, Zhejiang province Songyang County West screen Street 227 Rui Yang Road Patentee before: Zhejiang Longda Stainless Steel Co. Ltd. |
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