CN108103287A - A kind of heat treatment method for preparing low temperature resistant pipe line steel - Google Patents
A kind of heat treatment method for preparing low temperature resistant pipe line steel Download PDFInfo
- Publication number
- CN108103287A CN108103287A CN201711378064.5A CN201711378064A CN108103287A CN 108103287 A CN108103287 A CN 108103287A CN 201711378064 A CN201711378064 A CN 201711378064A CN 108103287 A CN108103287 A CN 108103287A
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- China
- Prior art keywords
- pipe line
- low temperature
- line steel
- temperature resistant
- heat treatment
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
A kind of heat treatment method for preparing low temperature resistant pipe line steel, belongs to pipe line steel manufacturing technology field.The heating quenching of different temperatures twice is carried out by the granular bainite microstructure obtained to controlled rolling and controlled cooling, while making microstructure homogenization, notable thinning microstructure obtains the bainite ferrite matrix with nanoscale slat dimension, ensure that fabulous combination of strength and toughness；Again by tempering, the Carbide Precipitation of chromium is made while eliminating stress, further improves intensity.It is described prepare low temperature resistant pipe line steel chemical composition be：Chrome content 0.5%~0.15%, remaining for X80 grades of pipe line steels composition range.The advantage is that obtaining the bainite ferrite matrix containing the ultra-fine lath of nanoscale and being uniformly distributed the line and staff control of carbide, good low-temperature flexibility had not only been ensured, but also improved intensity, be laid with suitable for the pipeline of extremely frigid zones.
Description
Technical field
The present invention relates to pipe line steel manufacturing technology, more particularly to a kind of heat treatment method for preparing low temperature resistant pipe line steel.
Background technology
At present, air demand demand increases year by year, reaches annual 380 billion cubic meter.For oil and coal, naturally
Gas is the energy of clean and effective the most in fossil energy.Sino-Russian east line natural gas line be Chinese bore maximum (1422 millimeters),
The long range natural-gas transfer pipeline of pressure highest (12 megapascal).Therefore, it is necessary to which discharge pressure is continuously improved, expands caliber, it is
Realize this target, it is necessary to increase substantially the intensity of pipeline, because with the raising of pipeline steel strength, except that can protect
Discharge pressure is demonstrate,proved, thickness of steel pipe and weight can also be reduced, so as to greatly save steel product cost.However, Sino-Russian east line is located in height
Cold area, by way of permafrost area temperature down to -63 DEG C, this proposes the low-temperature flexibility of steel high requirement.To sum up may be used
Know, for producing the Sino-Russian this kind of pipeline being laid in extremely frigid zones of eastern line, it is necessary to improve pipeline steel strength and toughness simultaneously.Patent
" a kind of heat treatment process for improving low-temperature impact toughness of pipeline steel " (201110150172.3) report one kind and pass through critical zone
Quenching obtains duplex structure so as to improve the heat treatment method of low-temperature flexibility, but it is mainly in X120 pipe line steels, such
Grade pipe line steel alloy content is high, and cost is higher, not yet a large amount of at present to use.Meanwhile impact of patent when only giving -30 DEG C
Performance, and do not give then and reporting for work for the impact property of lower temperature.Patent " a kind of quenching and tempering type high/low temperature toughness pipe line steel and manufacture
Method " (201610418422.X) equally only gives -35 DEG C of impact property, and does not provide strength character parameter.It is right
Report is yet there are no in the heat treatment method for improving pipeline steel strength and toughness simultaneously.
The content of the invention
It is an object of the invention to provide a kind of heat treatment methods for preparing low temperature resistant pipe line steel.By being obtained to controlled rolling and controlled cooling
The granular bainite microstructure arrived carries out the heating quenching of different temperatures twice, while making microstructure homogenization, notable thinning microstructure,
The bainite ferrite matrix with nanoscale slat dimension is obtained, ensure that fabulous combination of strength and toughness；Again by tempering, disappear
Make the Carbide Precipitation of chromium while de-stress, further improve intensity.
The chemical composition of pipe line steel selected by the present invention is：0.5%~1.5%, remaining is X80 grades for chromium content control
The composition range of pipe line steel.
A kind of manufacturing process of heat treatment method for preparing low temperature resistant pipe line steel provided by the invention is as follows：
Using converter or electric furnace smelting, then continuous Casting is obtained by conventional controlled rolling and controlled cooling with granular bainite microstructure
Based on roll state tissue.
Strand after controlled rolling and controlled cooling is fitted into heating furnace with stove heat to 1180~1200 DEG C, the time for 1~2 it is small when after
It is quenched into room temperature.
Quenched strand is fitted into heating furnace with stove heat to 910~960 DEG C again, heat preservation 30~quench after sixty minutes
To room temperature.
Finally quenched strand is fitted into heating furnace with stove heat to 630~680 DEG C, heat preservation 1~2 it is small when after come out of the stove
It is air-cooled to arrive room temperature.
A kind of technology controlling and process principle of heat treatment method for preparing low temperature resistant pipe line steel of the present invention is as follows：
Granular bainite microstructure is obtained by carrying out controlled rolling and controlled cooling to strand, this kind tissue general size is relatively fine and equal
It is even, provide basis for heat treatment process thinning microstructure below.By the heating quenching of first stage higher temperature, make to roll state group
Knit homogenization, while obtain martensitic structure, in the tissue different positions to lath beam can play segmentation crystal grain refinement tissue
Effect.Then obtained by second stage compared with the further thinning microstructure of the heating quenching of low temperature containing the ultra-fine plate of nanoscale
The bainite ferrite matrix of item, this tissue morphology have high low-temperature flexibility.Finally, the carbon of chromium is made by high tempering
Compound is precipitated between lath and uniformly on lath, further improves the intensity of steel.On the one hand the addition of chromium can improve quenches
Permeability obtains lath class loading after being conducive to quenching；On the other hand, can be analysed during tempering in the form of carbide
Go out, so as to improve intensity.
The advantage of the invention is that：Using most widely used X80 pipe line steels, the content of chromium is only improved, does not increase material
Cost.By carrying out two stage heating quenching and tempering to rolling state strand, the bayesian with the ultra-fine lath of nanoscale is obtained
Body ferrite matrix and the line and staff control for being uniformly distributed carbide, not only ensure good low-temperature flexibility, but also improve intensity, have
There is excellent comprehensive mechanical property, be laid with suitable for the pipeline of extremely frigid zones.
Description of the drawings
Fig. 1 is the metallographic microscope photo of low temperature resistant pipeline structure of steel prepared by the heat treatment method obtained in example.
Fig. 2 is the high power scanning of the ultra-fine lath structure of low temperature resistant pipe line steel prepared by the heat treatment method obtained in example
Electromicroscopic photograph.
Fig. 3 is that the power spectrum of carbide precipitate in low temperature resistant pipeline structure of steel prepared by the heat treatment method obtained in example is shone
Piece.
Specific embodiment
The essence of the present invention is described further below by example.
A kind of heat treatment method for preparing low temperature resistant pipe line steel of the present invention, continuous casting billet is obtained using vacuum induction furnace smelting,
Its chemical composition is as shown in table 1.First, continuous casting billet is subjected to controlled rolling and controlled cooling on heavy and medium plate mill and obtains granular bainite group
It knits.Then the strand after rolling is fitted into heating furnace with stove heat to 1200 DEG C, heat preservation 1 it is small when after be quenched into room temperature.Then will
Strand after primary quenching is fitted into heating furnace again with stove heat to 940 DEG C, and heat preservation is quenched into room temperature after 45 minutes.Finally will
Strand after secondary quenching is fitted into heating furnace with stove heat to 660 DEG C, when heat preservation 2 is small after come out of the stove it is air-cooled to room temperature.It is prepared
The room temperature tensile mechanical property of low temperature resistant pipe line steel be listed in table 2, low temperature impact properties and DWTT performances are listed in 3 He of table respectively
4。
Fig. 1~2 are set forth under the metallographic and high power scanning electron microscope of the low temperature resistant pipe line steel of heat treatment method preparation
Microstructure morphology.As seen from Figure 1, it is in be staggered that obtained pipe line steel, which is organized in metallographic microscope,.From the height of Fig. 2
It is observed that the Sino-Russian ultra-fine lath of bainite ferrite is about 200nm~400nm in times stereoscan photograph, carbide
Particle size is about 100nm~200nm.Again from the energy spectrogram of Fig. 3, which is precipitated carbide or nitridation of the particle for chromium
Object.
The chemical composition (wt.%) of low temperature resistant pipe line steel prepared by 1 heat treatment method of table
The room temperature tensile mechanical property of low temperature resistant pipe line steel prepared by 2 heat treatment method of table
The low temperature impact properties of low temperature resistant pipe line steel prepared by 3 heat treatment method of table
The low temperature DWTT performances of low temperature resistant pipe line steel prepared by 4 heat treatment method of table
Claims (2)
1. a kind of heat treatment method for preparing low temperature resistant pipe line steel, using converter or electric furnace smelting and external refining, molten steel casting
Into continuous casting billet；It is characterized in that：The technical parameter controlled in process is：
(1) strand is carried out to controlled rolling and controlled cooling to obtain rolling state tissue based on granular bainite microstructure on heavy and medium plate mill；
(2) strand after controlled rolling and controlled cooling is fitted into heating furnace with stove heat to 1180~1200 DEG C, heat preservation 1~2 it is small when after quench
Fire arrives room temperature；
(3) quenched strand is fitted into heating furnace with stove heat to 910~960 DEG C, heat preservation 30~be quenched into after sixty minutes
Room temperature；
(4) quenched strand is fitted into heating furnace with stove heat to 630~680 DEG C again, when heat preservation 1~2 is small after come out of the stove sky
It is as cold as room temperature；
The chemical Composition Control chromium content of low temperature resistant pipe line steel prepared by the heat treatment method is at 0.5%~1.5% or X80 grades
The composition range of pipe line steel.
2. heat treatment method according to claim 1, which is characterized in that the thickness of the low temperature resistant pipe line steel steel plate of preparation
For：21.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711378064.5A CN108103287A (en) | 2017-12-19 | 2017-12-19 | A kind of heat treatment method for preparing low temperature resistant pipe line steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711378064.5A CN108103287A (en) | 2017-12-19 | 2017-12-19 | A kind of heat treatment method for preparing low temperature resistant pipe line steel |
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| Publication Number | Publication Date |
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| CN108103287A true CN108103287A (en) | 2018-06-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711378064.5A Pending CN108103287A (en) | 2017-12-19 | 2017-12-19 | A kind of heat treatment method for preparing low temperature resistant pipe line steel |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3507710A (en) * | 1967-02-23 | 1970-04-21 | United States Steel Corp | Process for treating steel |
| JPS4828316A (en) * | 1971-08-19 | 1973-04-14 | ||
| CN102168227A (en) * | 2010-02-25 | 2011-08-31 | 宝山钢铁股份有限公司 | Super-thick quenched-tempered steel plate with 60kg-grade tensile strength and production method of the super-thick quenched-tempered steel plate |
| CN103789685A (en) * | 2014-02-17 | 2014-05-14 | 上海海隆石油管材研究所 | High-strength high-toughness petroleum drill pipe and production method thereof |
| CN104372261A (en) * | 2014-11-19 | 2015-02-25 | 钢铁研究总院 | High-ductility X80 pipeline steel plate for alpine region and production method of high-ductility X80 pipeline steel plate |
-
2017
- 2017-12-19 CN CN201711378064.5A patent/CN108103287A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3507710A (en) * | 1967-02-23 | 1970-04-21 | United States Steel Corp | Process for treating steel |
| JPS4828316A (en) * | 1971-08-19 | 1973-04-14 | ||
| CN102168227A (en) * | 2010-02-25 | 2011-08-31 | 宝山钢铁股份有限公司 | Super-thick quenched-tempered steel plate with 60kg-grade tensile strength and production method of the super-thick quenched-tempered steel plate |
| CN103789685A (en) * | 2014-02-17 | 2014-05-14 | 上海海隆石油管材研究所 | High-strength high-toughness petroleum drill pipe and production method thereof |
| CN104372261A (en) * | 2014-11-19 | 2015-02-25 | 钢铁研究总院 | High-ductility X80 pipeline steel plate for alpine region and production method of high-ductility X80 pipeline steel plate |
Non-Patent Citations (1)
| Title |
|---|
| 祝鹏: "X80管线钢埋弧焊焊接接头调质处理后组织和性能研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
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Application publication date: 20180601 |