CN101956142B - Dual phase steel seamless pipe and processing method thereof - Google Patents
Dual phase steel seamless pipe and processing method thereof Download PDFInfo
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- CN101956142B CN101956142B CN 200910100376 CN200910100376A CN101956142B CN 101956142 B CN101956142 B CN 101956142B CN 200910100376 CN200910100376 CN 200910100376 CN 200910100376 A CN200910100376 A CN 200910100376A CN 101956142 B CN101956142 B CN 101956142B
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Abstract
The invention discloses a dual phase steel seamless pipe which comprises the following alloy compositions in percentage by weight: C no more than 0.025, 0.8 SI, 1.2 Mn, P no more than 0.03, S no more than 0.02, 6-8 Ni, 24-26 Cr, 3-5 Mo, 0.24-0.32 N, Cu no more than 0.5 and the balance of Fe. The invention has the advantages of alpha+gamma dual phase organization structure, higher corrosion resistance and impact resistance and stronger chloride stress corrosion cracking resistance, has the characteristics of both Austenitic stainless steel and ferritic stainless steel and can be used in the seawater for a long time.
Description
Technical field
The present invention relates to a kind of stainless steel seamless pipe and working method thereof.
Background technology
Press the functional characteristics classification of steel, be divided into low temperature stainless steel, magnetism-free stainless steel, free cutting stainless steel, superplasticity stainless steel etc.The sorting technique of using always is weave construction characteristics and the chemical ingredients characteristics of steel and the method classification that both combine by steel at present.Generally be divided into Martensite Stainless Steel, ferritic stainless steel, austenitic stainless steel, duplex stainless steel and PH Stainless Steel etc., or be divided into Chromium Stainless Steel and nickel and stainless steel two big classes.Duplex stainless steel refers to have simultaneously in the stainless steel stainless steel of austenite and two kinds of metallurgical structures of ferrite.Dual phase steel claims the complex phase steel again.Generally the steel that ferrite and austenite phase constitution are formed is called duplex stainless steel, and the steel of ferrite and martensitic phase tissue composition is called dual phase steel.Dual phase steel is that soft steel or Hi-Stren steel are after critical zone thermal treatment or controlled rolling and obtain.Typical dual phase steel yield strength σ s is 310MPa, and tensile strength σ b is 655MPa.Dual phase steel also can be used as pipe line steel, chain, cold-drawn wire, deformed bar etc. for the manufacture of the complex component of cold punching, deep drawing molding.
Austenite adds ferrite diphasic stainless steel and refers to that existing austenite in the stainless steel has the steel grade of ferritic structure structure again, and this two-phase structure will independently exist, and content is all bigger, and two make an appointment respectively accounts for 50%.Wherein one comparatively suitable between 40-60% in actual use.It is generally acknowledged that the content of looking younger most should be greater than 15%.Be base with the austenite and contain and be not less than 30% ferrite that modal is that two-phase respectively accounts for 50% duplex stainless steel and the plain duplex stainless steel of the austenite of using in the actual engineering+iron (custom claims α+γ duplex stainless steel or duplex stainless steel) is many.It is DSS (Duplex Stainless Steel) that duplex stainless steel English is write a Chinese character in simplified form.The ability of the anti-chloride stress cracking corrosion cracking of all duplex stainless steels is all apparently higher than 300 serial austenitic stainless steels, and its intensity also is much higher than austenitic stainless steel, shows good plasticity and toughness simultaneously.
The impelling strength of duplex stainless steel improves with the increase of nickel content.In general, its impelling strength is stabilized in the scope of 160-200J in α+γ two-phase region.
Owing to have α+γ two-phase structure, duplex stainless steel has the characteristics of austenitic stainless steel and ferritic stainless steel concurrently.Compare with ferritic stainless steel, the toughness height of α+γ duplex stainless steel, brittle transition temperature is low.Intergranular corrosion resistance performance and welding property are significantly increased; Some characteristics that kept simultaneously ferritic stainless steel again are little as 475 ℃ of fragility, thermal conductivity height, linear expansivity, have superplasticity, be magnetic etc.Compare with austenitic stainless steel, the intensity height of α+γ duplex stainless steel, particularly yield strength significantly improves, and performance such as intergranular corrosion resistance, anticorrosion stress-resistant, resistance to corrosion fatigue improves significantly.
Along with making constant progress of society, the appearance of some high requests and high performance equipment, in the seamless tube industry, the austenite seamless tube that some are common and dual phase steel (austenite, ferrite type stainless steel) have not caught up with needs.The application of seamless tube still is commonplace and is badly in need of in the industries that the ask for something resistance to corrosion is higher and impact resistance is higher such as boats and ships and offshore industry equipment, oil well, dual phase steel relatively more commonly used now has 00Cr18Ni5Mo3Si2,0Cr26Ni5Mo2 etc., though its anti-chloride stress cracking corrosion cracking ability, does not still satisfy the requirement of design needs in general apparently higher than 300 serial austenitic stainless steels.Attempt to produce the hope that more high performance dual phase steel has become each big steel mill under these circumstances, but the content requirement strictness about the production technique more complicated Chemical Composition of dual phase steel seamless tube, cause the product lumber recovery low owing to the immature of the annealing process in producing with to not understanding of cold deformation technology, even scrap by the gross.
Summary of the invention
My company of needs of answering situation has overcome the immature difficulty of bringing of annealing quenching technology in the product processing through continuous test and dual phase steel (00Cr25Ni7Mo4N) seamless tube that improves exploitation, grasp dual phase steel (00Cr25Ni7Mo4N) cold deformation technology flexibly, had the ability of batch process.
To achieve these goals, the technical solution used in the present invention is:
The dual phase steel seamless tube, the mass percent of the alloying constituent of seamless tube is: C :≤0.025; SI:0.8; Mn:1.2; P≤0.03; S≤0.02; Ni:6-8; Cr:24-26; Mo:3-5; N:0.24-0.32; Cu :≤0.5; Surplus is Fe;
In the alloying constituent, silicon, sulphur ratio are that 0.8/0.02 is 〉=40: 1; The ratio of chromium, nickel is 25/6 namely 〉=3: 1;
The working method of dual phase steel seamless tube, processing step is: adopt in the cold working operation and roll, pull out process integration;
Temperature range when one, solution treatment is carried out in the milling train distortion of the first road of cogging is 1160-1200 ℃, solution time is≤and 0.5/ meter of wall thickness *;
Temperature range when two, the pilot process drawing deformation carries out solution treatment is 1140-1180 ℃, solution time is≤and 0.8/ meter of wall thickness *;
Temperature range when three, the cold-drawn finished product carries out solution treatment is 1140-1180 ℃, solution time is≤and 1.39/ meter of wall thickness *.
Adopt in the cold working operation and roll, pull out process integration, primary milling train maximum distortion coefficient is 3.5, and secondary milling train deformation coefficient is 1.8 to the maximum, and cold-drawn maximum distortion coefficient is 1.5 for the third time.
Beneficial effect of the present invention: have α+γ two-phase structure, have the characteristics of austenitic stainless steel and ferritic stainless steel again concurrently, have higher resistance to corrosion and shock resistance stronger anti-chloride stress cracking corrosion cracking ability, the seamless tube that can use in seawater are for a long time arranged.Adopt this kind material to make pressure vessel conduit wall thickness etc. and reduce 30-40% than austenitic stainless steel commonly used and common duplex stainless steel, it is bright and clean that the body surfaces externally and internally that pulls out process integration production is rolled in employing, even tube wall that is to say that the mechanical property of pipe can be brought into play better.The seamless two-phase stainless-steel pipe of my company's exploitation also will enter industry-by-industry fast with the advantage that surpasses common stainless steel, fills up a blank of seamless tube industry.
Description of drawings
Fig. 1, simplification production process schema
Embodiment
One, chemical ingredients
Below two synopsis (table two is chemical ingredients of the present invention) that form is chemical ingredients.
Chemical Composition and the content of two kinds of dual phase steels stipulating in table one, the national standard
Two-phase stainless steel chemical composition and the content of table two, my company's exploitation
We are as can be seen from top two forms, we have reduced in the stainless steel, and the content of five big harmful elements has particularly reduced the content of element silicon and the content of element sulphur is greatly increased stainless toughness and anti-fracture shock resistance, adds that having improved in the stainless steel content of nickel makes α and γ two-phase region stable more and then more improved the stainless shock resistance of this kind and stainless chemical stability.Carbon, silicon, manganese, phosphorus, sulphur are to belong to the big harmful element of five in the stainless steel in stainless steel, in our novel material, reduce sulphur, the carbon that causes stainless steel fragility big and caused the high silicon of stainless steel hardness, when not influencing the novel material use properties, make the cold-formed property of this kind stainless steel seamless pipe become possibility, and shown superpower plasticity.
Two, mechanical property
Invention ambient temperature mechanical properties and USS ASTM A789 UNS S32750 and country
The mechanical property of standard GB/T14975 00Cr18Ni5Mo3Si2 is compared as follows:
| Tensile strength sigma b/Mpa | Yield strength σ p0.2/Mpa | Elongation gauge length σ 5/% | Reverse flattening test % | Hardness HRC ,≤ | |
| Conventional 300 series stainless steel 316L (00Cr17Ni14Mo2) | 480 | 175 | 35 | ------ | ---- |
| National standard | 590 | 390 | 20 | ----- | --- |
| 00Cr18Ni5Mo3Si2 | |||||
| USS UNS S32750 | 800 | 550 | 15 | 10 | 32 |
| The present invention's (dual phase steel) | 900 | 650 | 25 | 12.5 | 30 |
From above several data we as can be seen, many advantages of dual phase steel of the present invention, yield strength, tensile strength are apparently higher than the conventional duplex stainless steel of GB GB/T4975 and USS ASTM A789, elongation after fracture is not less than 25% and has shown superpower plasticity, is only second to 300 serial austenitic stainless steels.
Three, thermal treatment and cold deformation technology passage
Embodiment 1;
Dual phase steel seamless tube Chemical Composition and the content of making the super-strength highly corrosion resistant see the following form (being weight percentage)
I take charge of 14 meters of employing roll bottom type annealing furnace continuously, the furnace temperature when having guaranteed the annealing of seamless tube and body temperature constant in to reach abundant solid solution; The high-temperature zone has only 0.8 meter to the distance of outlet, makes the pipe through solution treatment can enter the state of cooling rapidly.Annealing temperature is stabilized in 1120 ℃-1200 ℃, cooling rapidly in water.
Specifically see the following form
| The passage solution treatment | Solid solubility temperature (℃) (high-temperature zone) | Treatment time (dividing/rice) |
| Work in-process; The cogging cold rolled tube | 1180±20 | 0.4 |
| Work in-process; Middle drawn tube | 1160±20 | 0.5 |
| Finished product | 1180±10 | 0.6 |
Annotate: solid solution: steel and alloy are heated to the temperature of single phase solid solution also through insulation fully, some constituent in steel and the alloy is dissolved in the matrix, and form uniform sosoloid, cooling rapidly then, the constituent that dissolves in is kept in the sosoloid, and this thermal treatment is called solution treatment.
Rolling in the cold deformation operation pull out process integration, the case process parameter sees the following form
Through the result that test of many times result such as title three produce, the deflection of passage has certain influence to final mechanical property.But final thermal treatment is only the immediate cause that influences the finished product mechanical property.Tensile strength and yield strength reduce with the rising of annealing temperature; But crossing the low fragility of material that can make again, annealing temperature increases.Grain fineness number also descends to some extent simultaneously.Coefficient of extension reduces with the decline of annealing temperature, and grain fineness number also obviously descends.The deflection of passage is thought bigger to the grain fineness number shadow of finished product; Excessive pass deformation causes the crystal grain fragmentation, and grain fineness number is obviously reduced, but too small pass deformation increases the processing passage again cost is increased.(that is to say that the corrosion resistance to finished product has fundamental influence).(what is called is rolled to pull out to unite and refer to the processing mode that adopts in the layout of technology, roll be rolling; Being the ductility of having utilized metal, is the deformation process of forging rolling.Pulling out is the extensibility of having utilized metal, is the process that viscous deformation is extended in the nature drawing.Take charge of this material of studying at me and use the resulting tube surface quality of this kind deformation technique and tolerance dimension to obtain good effective control, the mechanical property of material has obtained good performance.)
Its second advantage is to roll the implementation of pulling out process integration, improved the qualification rate of lumber recovery and the product of product.
The finished product solid solution temperature influences synopsis (seeing the following form) to mechanical property
Final pass deformation and return of goods temperature are to the synopsis that influences of grain fineness number
| Final pass deformation | Grain fineness number (level) | Solid solubility temperature | Grain fineness number (level) |
| 1.131 | 8 | 1140 | 6.5 |
| 1.472 | 8 | 1180 | 8 |
| 1.721 | 7 | 1220 | 7.5 |
See also Fig. 1 workflow is described.
Preparation work before cold deformation is the process of a more complicated, in the process of steel-making, to carry out heat analysis (namely the chemical ingredients in the steel is controlled and confirm), carry out the composition affirmation again after the process hot-work perforation, thereby guarantee the composition of material.
Be exactly cold deformation at next step, main texturing machine is cold-rolling mill and drawbench, the production characteristics of cold rolling cold drawing steel tube are, after pipe is expected before the cold deformation again and cumulative deformation acquires a certain degree at goods in order to eliminate work hardening and other need carry out a series of preparation works before cold deformation, operation is many, and the pipe material is processed into finished product from going into operation to usually must be through repeatedly cold deformation.Part between so-called " # " (notes) just.The work of part all is for obtaining cold deformation smoothly between " # ".
Pickling is in order to obtain clean metallic surface, and the friction when reducing cold deformation and obtain high-quality body surface is to obtain clean body surface for finished product, makes tube surface obtain the resistance to corrosion that fine and close passive film improves pipe.Lubricated is in order to reduce the friction between body and the moulds of industrial equipment, to improve deflection and reduce rolling pass and obtain high-quality body surface.Aligning is each operation easy to operate in the flow process for convenience, reduces taking of place, also is to satisfy one of desired sinuousness significant process of production tube simultaneously.
Annotate: can repeatedly circulate according to operation between the arts demand " # " of required trimmed size.
Four, check
The check aspect, every test and test method through experimental demonstration related check aspect can meet national standard and corresponding USS and European Union's standard etc. fully.
Our company is through research repeatedly, manufacture craft has been carried out continuous adjustment, particularly the annealing process aspect is improved, and has overcome other producers the temperature deviation of seamless two-phase stainless-steel pipe when annealing caused the underproof phenomenon of pipe mechanical property by the gross greatly.
Claims (2)
1. a dual phase steel seamless tube is characterized in that, the mass percent of the alloying constituent of seamless tube is: C :≤0.025; SI:0.8; Mn:1.2; P≤0.03; S≤0.02; Ni:6-8; Cr:24-26; Mo:3-5; N:0.24-0.32; Cu :≤0.5; Surplus is Fe, and in the alloying constituent, silicon, sulphur ratio are 0.8/0.02; The ratio of chromium, nickel is 25/6.
2. the working method of the described dual phase steel seamless tube of claim 1 is characterized in that, processing step is: in the cold working operation, adopt rolling, pull out process integration;
Temperature range when one, solution treatment is carried out in the milling train distortion of the first road of cogging is 1160-1200 ℃, solution time is≤and 0.5/ meter of wall thickness *;
Temperature range when two, the pilot process drawing deformation carries out solution treatment is 1140-1180 ℃, solution time is≤and 0.8/ meter of wall thickness *;
Temperature range when three, the cold-drawn finished product carries out solution treatment is 1140-1180 ℃, solution time is≤1.39/ meter of wall thickness *, adopt in the cold working operation and roll, pull out process integration, primary milling train maximum distortion coefficient is 3.5, secondary milling train deformation coefficient is 1.8 to the maximum, and cold-drawn maximum distortion coefficient is 1.5 for the third time.
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| CN 200910100376 CN101956142B (en) | 2009-07-13 | 2009-07-13 | Dual phase steel seamless pipe and processing method thereof |
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| CN 200910100376 CN101956142B (en) | 2009-07-13 | 2009-07-13 | Dual phase steel seamless pipe and processing method thereof |
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| CN101956142B true CN101956142B (en) | 2013-09-11 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102606841A (en) * | 2012-04-01 | 2012-07-25 | 常熟市异型钢管有限公司 | Ship oil way protection device, processing method of protection sleeve and core rod for processing |
| CN102618798B (en) * | 2012-04-23 | 2013-06-05 | 大连理工大学 | Ultrahigh-strength ferrite aged stainless steel |
| CN103710637A (en) * | 2013-12-26 | 2014-04-09 | 浙江德传管业有限公司 | Thin-wall super duplex stainless steel seamless tube and production technology thereof |
| CN104388836B (en) * | 2014-10-27 | 2016-09-21 | 浙江信得达特种管业有限公司 | Desalinization super austenitic seamless steel pipe and piercing process thereof |
| JP6763876B2 (en) * | 2015-04-10 | 2020-09-30 | サンドビック インテレクチュアル プロパティー アクティエボラーグ | Duplex stainless steel pipe manufacturing method |
| CN108103417A (en) * | 2016-11-25 | 2018-06-01 | 中国石化工程建设有限公司 | A kind of low-temperature pressure container dual phase steel steel pipe and preparation method thereof |
| CN108103416A (en) * | 2016-11-25 | 2018-06-01 | 中国石化工程建设有限公司 | A kind of low-temperature pressure container two-phase steel forgings and preparation method thereof |
| 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 |
| CN114653751B (en) * | 2022-03-16 | 2023-04-07 | 北京科技大学 | Preparation method of duplex stainless steel cold-rolled ribbed steel bar |
| CN116463543A (en) * | 2023-04-12 | 2023-07-21 | 安徽军明机械制造有限公司 | Production process method of sand suction pump shell |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101220443A (en) * | 2008-01-22 | 2008-07-16 | 江苏长盈不锈钢管有限公司 | Stainless steel weldless steel tube for ship and producing technique |
-
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101220443A (en) * | 2008-01-22 | 2008-07-16 | 江苏长盈不锈钢管有限公司 | Stainless steel weldless steel tube for ship and producing technique |
Non-Patent Citations (2)
| Title |
|---|
| 吴忠忠等.固溶温度对超级双相不锈钢00Cr25Ni7Mo4N组织和性能的影响.《特殊钢》.2006,(第04期), |
| 固溶温度对超级双相不锈钢00Cr25Ni7Mo4N组织和性能的影响;吴忠忠等;《特殊钢》;20060831(第04期);表1 * |
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