CN104805375B - A kind of ultra thick gauge high tenacity X80 pipeline steel and its manufacture method - Google Patents
A kind of ultra thick gauge high tenacity X80 pipeline steel and its manufacture method Download PDFInfo
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- CN104805375B CN104805375B CN201510153571.3A CN201510153571A CN104805375B CN 104805375 B CN104805375 B CN 104805375B CN 201510153571 A CN201510153571 A CN 201510153571A CN 104805375 B CN104805375 B CN 104805375B
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- 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
- C21D8/0226—Hot rolling
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Abstract
The invention discloses ultra thick gauge high tenacity X80 pipeline steel, the chemical composition of this steel plate is C0.02～0.06% by mass percentage, Mn1.6～1.9%, Si0.1～0.35%, S≤0.0006%, P≤0.010%, Nb0.055～0.08%, Ti0.008～0.03%, V≤0.008%, Al≤0.06%, N≤0.010%, O≤0.006%, Mo≤0.15%, Cu≤0.20%, Ni0.2～0.4%, Cr≤0.35%, Ca≤0.01%, balance of Fe and inevitable impurity element；The thickness of described steel plate be 30mm and more than.The manufacturing process flow of steel plate is smelting, continuous casting → heat → roll → cool down, and thoroughly solves ultra thick gauge X80 low temperature block hammer performance requirement technical barrier using special component and specific T MCP technique.
Description
Technical field
The present invention relates to X80 pipeline steel manufactures field and in particular to a kind of thickness with superior low temperature block hammer performance
Degree is not less than X80 pipeline steel and its manufacture method of 30mm.
Background technology
At present in the energy of world demand, fossil energy also accounts for the principal status of public economy in energy resource structure, in recent years World Economics
Rapidly increase the rapidly growth greatly having driven fossil energy demand, this has been also greatly facilitate sending out of long distance delivery pipeline
Exhibition, for improving transfer efficiency, reduces investment, the development trend of distance petroleum gas delivering pipe line steel be to high intensity or
Superelevation grade of steel develops.The pipe line steel highest grade of steel that countries in the world use at present is X80 steel-grade.For improving discharge pressure, X80 steel-grade
Develop to think gauge direction, current section of tubing has started to using thickness more than 30mm wall thickness X80 pipe line steel, and from now on can
A large amount of employings.
The domestic research to X80 level pipeline steel at present is just many.
As mentioned this in patent No. CN101845596B, the production above X80 of 20-35 mm is applied to using Plate Production mode
Pipe line steel, this patent has following features：1）S≤0.05% in composition design, S is harmful element, and actually thickness is less than
20mmX80 pipe line steel S content all controls 0.005% and less, and it is especially special thick that too high S can seriously damage Pipeline Steel Toughness
Steel plate block hammer performance requires；Ni≤0.20%, usual Ni content raising exceedes to the toughness especially thickness improving pipe line steel
The X80 pipe line steel of 30mm is favourable；2）This patent critical process window in rolling mill practice is very wide, and this is to below 23mm grade of steel
Can impact less, but to pipe line steel above with 30mm thickness specification, then performance is difficult to ensure that, especially block hammer performance, practice card
Bright, it is difficult to meet thickness specification in more than 30mm block hammer performance requirement using this technique and composition.
As mentioned this application patent in Patent No. CN103225047A, production thickness is applied to using Plate Production mode
It is not less than 26.5mm specification X80 pipe line steel, this patent application has following features：1）In steel plate composition, Mo is not less than 0.15%, super
In the case of think gauge, increase the sensitivity that Mo can bring the tissues such as a shellfish, this is unfavorable to block hammer performance, also corresponding increasing is closed simultaneously
Golden cost；Nb content is 0.025-0.055%, and too low Nb content is in heavy slab roll control Austenite Grain Growth and refinement
Effect produced by ferrite crystal grain aspect is less；2）In subsequent rolling mill practice with Patent No. CN101845596B in mention
Similar, process window is very wide, it is difficult to ensure that block hammer performance, this is also embodied in my practice.
In fact, thickness specification is a universally acknowledged difficult problem in the block hammer performance of more than 30mm X80 pipe line steel, both domestic and external
Research shows, block hammer performance is except, in addition to the factor such as the tissue in steel and ambient temperature, also having close pass with the thickness of steel plate
System, and increase with thickness, more sensitive to thickness！This is referred to as thickness effect！For solving the thickness effect under ultra thick gauge, need
It is designed from tissue, that is, control and be controlled on organization type and crystal grain thinning.
The present invention is based on above-mentioned design philosophy, in conjunction with current equipment, specific for obtaining specific tissue proposition
Composition design, and according to this composition characteristic, formulate specific TMCP technique.
Content of the invention
The X80 pipe line steel more than 30mm for the think gauge X80 pipe line steel particularly thickness needs the low-temperature flexibility meeting harshness to want
Ask, particularly not higher than -15 DEG C DWTT of temperature section of shear of dropping hammer requires, and is the technical barrier generally acknowledged in the world.For solving to be somebody's turn to do
Technical barrier is the invention provides a kind of produce the X80 pipeline steel that thickness is more than 30mm and its manufacture method, super for obtaining
Think gauge and meet low temperature DWTT block hammer performance, in addition to improving composition design, adopts special producing technique in production technology, from
And obtain excellent low temperature block hammer performance, meanwhile, technique adjustment is simple, and lumber recovery also can be improved.
The technical scheme that present invention solution above-mentioned technical problem is adopted is that a kind of ultra thick gauge high tenacity X80 pipeline is used
Steel plate it is characterised in that：The chemical composition of this steel plate is C by mass percentage：0.02～0.06%, Mn：1.6～1.9%,
Si：0.1～0.35%, S：≤ 0.0006%, P：≤ 0.010%, Nb：0.055～0.08%, Ti：0.008～0.03%, V：≤
0.008%, Al：≤ 0.06%, N：≤ 0.010%, O：≤ 0.006%, Mo：≤ 0.15%, Cu：≤ 0.20%, Ni：0.2～
0.4%, Cr≤0.35%, Ca：≤ 0.01%, balance of Fe and inevitable impurity element；The thickness of described steel plate is
30mm and more than.
Further, the thickness of described steel plate is 30～35mm；Grain size reach 11 grades and more than；Yield strength is not less than
560Mpa；Tensile strength is not less than 660Mpa；Elongation percentage is not less than 25%；- 25 DEG C of ballistic works are not less than 400J；- 40 DEG C of ballistic works
It is not less than 350J；- 60 DEG C of ballistic works are not less than 300J；- 15 DEG C of sections of shear of dropping hammer are not less than 85%；- 20 DEG C of sections of shear of dropping hammer
It is not less than 75%.
In the present invention, the composition design thought of ultra thick gauge low-temperature high-toughness X80 pipe line steel steel plate is based on using appropriate
C, Mn, by adding the micro alloying elements such as micro Nb, V, Ti, add the elements such as a small amount of Mo, Cu, Ni, then by changing
Good TMCP technique, with the final low-temperature high-toughness ensureing ultra thick gauge X80 pipeline steel, especially has excellent DWTT
Block hammer performance, the chemical composition of steel plate is related such that:
C：It is most economical, most basic intensified element in steel, steel can be significantly improved by solution strengthening and precipitation strength
Intensity, but the toughness to steel and ductility and welding performance bring adverse effect, and the development trend of therefore pipe line steel is continuous fall
Low C content, it is contemplated that the matching relationship of intensity and toughness, C content is controlled 0.02～0.06%.
Mn：Improve the intensity of steel by solution strengthening, be to make up because C content reduces in pipe line steel to cause loss of strength
Topmost element, Mn still expands the element of γ phase region simultaneously, it is possible to decrease γ → α phase transition temperature of steel, contributes to obtaining carefully
Little phase-change product, can improve the toughness of steel, reduce tough brittle transition temperature, and Mn is also the quenching degree element improving steel.This
Bright middle Mn content designs in 1.6～1.9% scopes.
Nb：It is one of topmost micro alloying element in modern micro alloyed steel particularly pipe line steel, to crystal grain refinement
Effect clearly.By the Nb in the solid solution towing of Nb and course of hot rolling（C,N）Strain induced precipitate can hinder deformation difficult to understand
The recovery and recrystallization of family name's body, makes the deformed austeaite that Unhydrated cement rolls be changed in phase transformation through TMCP and tiny mutually sells of one's property
Thing, so that steel has high intensity and high tenacity, the present invention mainly determines Nb content range by the relation of C and Nb content.
V：There is higher precipitation strength and weaker Grain Refinement Effect, in tri- kinds of microalloies of Nb, V, Ti under normalizing state
When changing elements compounding use, V acts primarily as precipitation strength effect, and the present invention passes through to add certain V, gives full play to V in steel
Precipitation strength acts on, but too high V will weaken the toughness of steel, and the therefore present invention controls V≤0.008%.
Ti：It is strong solid N element, the stoichiometric proportion of Ti/N is 3.42, and the Ti using 0.02% about can fix in steel
The N of below 60ppm, can form TiN precipitated phase during sheet billet continuous casting, and this tiny precipitated phase can effectively stop slab
The growing up of austenite crystal in heating process, is favorably improved solid solubility in austenite for the Nb, can improve sweating heat simultaneously
The impact flexibility of the zone of influence, is indispensable element in pipe line steel.
Mo：The formation first separating out ferritic phase during γ → α phase transformation can be postponed, promote the main unit that acicular ferrite is formed
Element, to controlling phase transformation to play an important role, is also the quenching degree element improving steel simultaneously, in certain rate of cooling and whole cold temperature
The lower certain Mo of interpolation that passes through of degree can obtain obvious acicular ferrite or bainite structure.
S、P：It is that in pipe line steel, inevitable impurity element it is desirable to more low better, processed by super-low sulfur and Ca and changes
Oxide morphology can make pipe line steel have very high impact flexibility.
Cu、Ni：The intensity of steel can be improved by solution strengthening, Ni adds the toughness that on the one hand can improve steel, changes simultaneously
The red brittleness that kind Cu easily causes in steel.
Cr：The addition of Cr can improve the quenching degree of steel, belong to intensity and improve element, and relatively economical.
The technical scheme that the present invention solves another technical problem is to provide a kind of above-mentioned ultra thick gauge high tenacity X80 pipeline to use
The manufacture method of steel plate, concrete technology step is as follows：
First by raw materials for metallurgy successively through KR molten iron pretreatment, converter smelting, LF refine, RH vacuum refining and continuous casting,
Produce meet chemical composition require, thickness be 350mm and above continuous casting billet；Continuous casting billet is again heated to 1180～1230
DEG C, insulation 6.5h and above it is ensured that Nb carbonitride solid solution suppresses austenite crystal too to grow up simultaneously；Carry out two ranks after coming out of the stove
Section rolling：First stage rolls for recrystallization zone, and finishing temperature control, at 1050～1100 DEG C, controls even during recrystallization zone rolling
The single pass reduction ratio of continuous two to three passages is not less than 22%；Second stage is the rolling of non-recrystallization zone, and start rolling temperature controls
820～960 DEG C, non-recrystallization zone adds up reduction ratio and is not less than 55%, ensures finishing temperature control in phase transformation critical temperature simultaneously
Ar3 ± 15 DEG C,；Then cooling metal sheets, begin to cool down temperature control and are not higher than 760 DEG C, terminate chilling temperature be controlled to 350～
500 DEG C, rate of cooling is 10～30 DEG C/s；, steel plate subsequently naturally cools to room temperature.
Key one step in above-mentioned steel plate preparation method is that non-recrystallization zone rolls in addition to requiring Strain Accumulation, is also important to
Ask and carry out final pass rolling near phase critical point Ar3, by deformation-induced ferrite transformation so that along steel plate thickness portion
Position, the partial austenitic of particularly steel plate center portion is changed into very tiny ferrite, thus each phase composition ratio in optimizing tissue
Example, obtains excellent toughness.Because thick steel plates center portion is higher than surface of steel plate temperature, and center portion specific surface cooling when cooling down
Slowly, steel plate center portion and surface temperature difference are big, often form granular bainite microstructure thick in a large number in center portion, and this tissue is to dropping hammer
Performance is very unfavorable, and therefore core structure optimization is extremely difficult always, how to reduce the granular bayesian of think gauge Pipeline Steel Plate center portion
Body burden, raising block hammer performance is one and significantly works.By rolling near strain accumulation+final pass Ar3, profit
With strain induced ferrite phase transformation so that particularly center portion very fine ferrite crystal grain in whole thickness direction separates out, thus excellent
Change whole thickness direction tissue, obtain excellent ultra thick gauge X80 block hammer performance.
The X80 steel plate of think gauge of the present invention need not follow-up hardening and tempering process, simplify technique, be favorably improved production efficiency.
Compared with prior art, the present invention has following features： 1）By adjusting the alloying component of X80 pipe line steel, make to fit
In production more than 30mm spy's think gauge X80 pipe line steel, and match with specific T MCP technique in process for making, produce more than 30mm
Special think gauge X80 steel plate, makes steel plate finished product have an excellent low-temperature flexibility, the block hammer performance of particularly -15 DEG C and temperature below；
2）This invention specific T MCP process is simple, lumber recovery is high；3）Super thick is thoroughly solved using special component and specific T MCP technique
Specification X80 low temperature block hammer performance requires technical barrier.
Brief description
Fig. 1 is the organization chart of the embodiment of the present invention 1 light plate.
Specific embodiment
Below in conjunction with accompanying drawing, embodiment, the present invention is described in further detail.
Embodiment 1
The thickness of the ultra thick gauge high tenacity X80 pipeline steel of the present embodiment is 30mm, and its chemical composition presses quality hundred
Ratio is divided to be calculated as：C：0.02%, Mn：1.9%, Si：0.25%, S：0.0005%, P：0.01%, Nb：0.055%, Ti：0.018%, V：
0.007%, Al：0.030%, Mo+Cu+Ni+Cr≤0.65%, N≤0.010%, O：≤ 0.006%, Ca：≤ 0.01%, surplus
For Fe and inevitable impurity element.
The manufacturing process of this X80 pipeline steel is, by above-mentioned steel plate finished product chemical constituent configuration raw materials for metallurgy and according to
Secondary through KR molten iron pretreatment, converter smelting, LF refine, RH vacuum refining and continuous casting, produce meet chemical composition require, thick
Spend for 370mm about continuous casting billet.Continuous casting billet is again heated to 1180 DEG C, is incubated 7.5 hours；Carry out two benches after coming out of the stove to roll
System：First stage rolls for recrystallization zone, and finishing temperature control, at 1050～1100 DEG C, controls continuous two during recrystallization zone rolling
Single pass reduction ratio to three passages is not less than 22%, and accumulative deformation rate is 15～55%；Second stage is the rolling of non-recrystallization zone,
Start rolling temperature is controlled to 820～960 DEG C, and accumulated deformation rate is 55%, finishing temperature control in phase transformation critical temperature, that is, 760 DEG C；
Then cooling metal sheets, begin to cool down temperature control and are not higher than 760 DEG C, and rate of cooling is 19 DEG C/s, and terminating chilling temperature is 500
DEG C, it is finally cooled to room temperature and obtain steel plate finished product.
The X80 pipeline steel of the 30mm thickness being obtained via above-mentioned manufacturing process, grain size has reached more than 11.0 grades, main
To be existed with acicular ferrite phase, as shown in figure 1, excellent combination property, its mechanical performance refers to table 1.
Embodiment 2
The thickness of the ultra thick gauge high tenacity X80 pipeline steel of the present embodiment is 35mm, and its chemical composition presses quality hundred
Ratio is divided to be calculated as：C：0.06%, Mn：1.65%, Si：0.15%, S：0.0005%, P：0.008%, Nb：0.070%, Ti：0.018%, V：
0.008%, Al：0.028%, Mo+Cu+Ni+Cr≤0.65%, N≤0.010%, O：≤ 0.006%, Ca：≤ 0.01%, surplus
For Fe and inevitable impurity element.
The manufacturing process of this X80 pipeline steel is, by above-mentioned steel plate finished product chemical constituent configuration raw materials for metallurgy and according to
Secondary through KR molten iron pretreatment, converter smelting, LF refine, RH vacuum refining and continuous casting, produce meet chemical composition require, thick
Spend for 370mm about continuous casting billet.Continuous casting billet is again heated to 1200 DEG C, is incubated 7 hours；Carry out two-phase control rolling after coming out of the stove：
First stage be recrystallization zone rolling, finishing temperature control at 1050～1100 DEG C, recrystallization zone rolling when control continuous two to
The single pass reduction ratio of three passages is not less than 22%, and accumulative deformation rate is 16～50%；Second stage is the rolling of non-recrystallization zone, opens
Roll temperature control be 820～960 DEG C, accumulative deformation rate be 60%, finishing temperature control near phase transformation critical temperature Ar3, that is,
755℃；Then cooling metal sheets, begin to cool down temperature control and are not higher than 760 DEG C, and rate of cooling is 10 DEG C/s, terminate cooling temperature
Spend for 350 DEG C, be finally cooled to room temperature and obtain final product steel plate finished product.
The X80 pipeline steel of the 35mm thickness being obtained via above-mentioned manufacturing process, grain size has reached more than 11.0 grades, main
To be existed with acicular ferrite phase, excellent combination property, its mechanical performance refers to table 1.
Embodiment 3
The thickness of the ultra thick gauge high tenacity X80 pipeline steel of the present embodiment is 33mm, and its chemical composition presses quality hundred
Ratio is divided to be calculated as：C：0.04%, Mn：1.75%, Si：0.23%, S：0.0005%, P：0.009%, Nb：0.080%, Ti：0.018%, V：
0.007%, Al：0.030%, Mo+Cu+Ni+Cr≤0.65%, N≤0.010%, O：≤ 0.006%, Ca：≤ 0.01%, surplus
For Fe and inevitable impurity element.
The manufacturing process of this X80 pipeline steel is, by above-mentioned steel plate finished product chemical constituent configuration raw materials for metallurgy and according to
Secondary through KR molten iron pretreatment, converter smelting, LF refine, RH vacuum refining and continuous casting, produce meet chemical composition require, thick
Spend for 350mm about continuous casting billet.Continuous casting billet is again heated to 1183 DEG C, is incubated 7 hours；Carry out two-phase control rolling after coming out of the stove：
First stage be recrystallization zone rolling, finishing temperature control at 1050～1100 DEG C, recrystallization zone rolling when control continuous two to
The single pass reduction ratio of three passages is not less than 22%, and accumulative deformation rate is 19～40%；Second stage is the rolling of non-recrystallization zone, opens
Roll temperature control be 820～960 DEG C, accumulative deformation rate be 62%, finishing temperature control near phase transformation critical temperature Ar3, that is,
775℃；Then cooling metal sheets, begin to cool down temperature control and are not higher than 760 DEG C, and rate of cooling is 15 DEG C/s, terminate cooling temperature
Spend for 400 DEG C, be finally cooled to room temperature and obtain final product steel plate finished product.
The X80 pipeline steel of the 33mm thickness being obtained via above-mentioned manufacturing process, grain size has reached more than 11.0 grades, main
To be existed with acicular ferrite phase, excellent combination property, its mechanical performance refers to table 1.
Embodiment 4
The thickness of the ultra thick gauge high tenacity X80 pipeline steel of the present embodiment is 35mm, and its chemical composition presses quality hundred
Ratio is divided to be calculated as：C：0.05%, Mn：1.73%, Si：0.25%, S：0.0015%, P：0.007%, Nb：0.065%, Ti：0.018%, V：
0.008%, Al：0.035%, Mo+Cu+Ni+Cr≤0.65%, N≤0.010%, O：≤ 0.006%, Ca：≤ 0.01%, surplus
For Fe and inevitable impurity element.
The manufacturing process of this X80 pipeline steel is, by above-mentioned steel plate finished product chemical constituent configuration raw materials for metallurgy and according to
Secondary through KR molten iron pretreatment, converter smelting, LF refine, RH vacuum refining and continuous casting, produce meet chemical composition require, thick
Spend for 350mm about continuous casting billet.Continuous casting billet is again heated to 1210 DEG C, is incubated 8 hours；Carry out two-phase control rolling after coming out of the stove：
First stage be recrystallization zone rolling, finishing temperature control at 1050～1100 DEG C, recrystallization zone rolling when control continuous two to
The single pass reduction ratio of three passages is not less than 22%, and accumulative deformation rate is 21～57%；Second stage is the rolling of non-recrystallization zone, opens
Roll temperature control be 820～960 DEG C, accumulative deformation rate be 68%, finishing temperature control near phase transformation critical temperature Ar3, that is,
770℃；Then cooling metal sheets, begin to cool down temperature control and are not higher than 760 DEG C, and rate of cooling is 13 DEG C/s, terminate cooling temperature
Spend for 450 DEG C, be finally cooled to room temperature and obtain final product steel plate finished product.
The X80 pipeline steel of the 35mm thickness being obtained via above-mentioned manufacturing process, grain size has reached more than 11.0 grades, main
To be existed with acicular ferrite phase, excellent combination property, its mechanical performance refers to table 1.
The mechanical performance of the steel plate that each embodiment of table 1 is produced
Claims (2)
1. a kind of ultra thick gauge high tenacity X80 pipeline steel it is characterised in that：The chemical composition of this steel plate is by mass percentage
It is calculated as C：0.02～0.06%, Mn：1.6～1.9%, Si：0.1～0.35%, S：≤ 0.0006%, P：≤ 0.010%, Nb：0.055
～0.08%, Ti：0.008～0.03%, V：≤ 0.008%, Al：≤ 0.06%, N：≤ 0.010%, O：≤ 0.006%, Mo：≤
0.15%, Cu：≤ 0.20%, Ni：0.2～0.4%, Cr≤0.35%, Ca：≤ 0.01%, balance of Fe and inevitably
Impurity element；The thickness of described steel plate be 30mm and more than；
The manufacturing technology steps of steel plate are as follows：First by raw materials for metallurgy successively through KR molten iron pretreatment, converter smelting, LF refine,
RH vacuum refining and continuous casting, produce and meet that chemical composition requires, thickness is continuous casting billet not less than 350mm；By continuous casting billet again
It is heated to 1180～1230 DEG C, insulation is not less than 6.5 hours；Carry out two-phase control rolling after coming out of the stove：First stage is recrystallization zone
Rolling, finishing temperature control, at 1050～1100 DEG C, controls the single pass of continuous two to three passages to depress during recrystallization zone rolling
Rate is not less than 22%；Second stage is the rolling of non-recrystallization zone, and start rolling temperature controls at 820～960 DEG C, and non-recrystallization zone adds up
Reduction ratio is not less than 55%, and finishing temperature control is in phase transformation critical temperature Ar3 ± 15 DEG C；Then cooling metal sheets, begin to cool down temperature
It is controlled to not higher than 760 DEG C, terminates chilling temperature and be controlled to 350～500 DEG C, rate of cooling is 10～30 DEG C/s；Subsequently cool down
Obtain final product steel plate finished product to room temperature.
2. ultra thick gauge high tenacity X80 pipeline steel according to claim 1 it is characterised in that：The thickness of described steel plate
Spend for 30～35mm；Grain size reach 11 grades and more than；Yield strength is not less than 560Mpa；Tensile strength is not less than 660Mpa；
Elongation percentage is not less than 25%；- 25 DEG C of ballistic works are not less than 400J；- 40 DEG C of ballistic works are not less than 350J；- 60 DEG C of ballistic works are not less than
300J；- 15 DEG C of sections of shear of dropping hammer are not less than 85%；- 20 DEG C of sections of shear of dropping hammer are not less than 75%.
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| CN105950972A (en) * | 2016-05-13 | 2016-09-21 | 江阴兴澄特种钢铁有限公司 | Thick-specification X80 pipeline steel plate with process time being shortened and manufacturing method thereof |
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| CN101397625B (en) * | 2007-09-24 | 2011-04-13 | 宝山钢铁股份有限公司 | Superfine grain steel sheet with yield strength of 420 MPa grade and method for producing the same |
| CN102172619A (en) * | 2010-12-31 | 2011-09-07 | 武汉钢铁(集团)公司 | Hot rolling process capable of improving high-grade thick pipeline steel fracture toughness |
| CN103658170B (en) * | 2012-09-26 | 2015-11-18 | 中国石油天然气集团公司 | The milling method of pipe line steel and steel pipe |
| JP6123713B2 (en) * | 2014-03-17 | 2017-05-10 | Ｊｆｅスチール株式会社 | Thick-walled hot-rolled steel strip and method for producing the same |
| CN103981462A (en) * | 2014-05-30 | 2014-08-13 | 秦皇岛首秦金属材料有限公司 | Excellent-toughness large-wall-thickness X80 steel for low-temperature stations, and manufacturing method thereof |
| CN104109744B (en) * | 2014-07-28 | 2016-11-09 | 攀钢集团西昌钢钒有限公司 | The method improving pipeline steel block hammer performance |
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