CN109487064A - X80 pipe line steel slab controlling hot rolling method - Google Patents
X80 pipe line steel slab controlling hot rolling method Download PDFInfo
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- CN109487064A CN109487064A CN201811449848.7A CN201811449848A CN109487064A CN 109487064 A CN109487064 A CN 109487064A CN 201811449848 A CN201811449848 A CN 201811449848A CN 109487064 A CN109487064 A CN 109487064A
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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
- C21D8/0205—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
- 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
- C21D8/0221—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
-
- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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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)
- Metal Rolling (AREA)
Abstract
This application provides a kind of X80 pipe line steel slab controlling hot rolling methods, the hot-rolled process includes heating stepses, milling step and cooling step, after the milling step, when carrying out cooling step, X80 pipe line steel slab carries out cooling by ACC mode after head is blocked, the range that control head is blocked is the head length 3-6m of X80 pipe line steel slab, blocks the 1-95% that water accounts for normal water, and the maximum transition distance for blocking water to normal water is controlled in 3-10m.This method lumber recovery improves 2%~3%, the performance of steel plate controls within 30MPa with plate difference, and the unevenness control of steel plate is in the excellent level of 3mm/m, effectively increase the precision of steel plate shearing, the problem of shearing of steel plate is bad, size is not hit by is significantly improved, and the shearing fraction defective of steel plate controls within 1 ‰.
Description
Technical field
This application involves high-carbon steel continuous casting technical fields, in particular to a kind of X80 pipe line steel slab controlling hot rolling side
Method.
Background technique
The energy is the important foundation that national economy realizes sustainable development, and natural gas is a kind of low-carbon fossil energy, is expanded
Its ratio in China's energy resource structure, for ensureing that China's energy, preserving the ecological environment has important practical significance, with
The continuous development of east China regional economy, energy notch gradually expand, and the demand to natural gas resource gradually expands.Pipeline is defeated
Sending is most economical, efficient and environmentally friendly energy medium delivery method, has completed " three lines of transfering natural gas from the west to the east ", " the Shan capital four of construction
The key projects such as line " and the Sino-Russian eastern line built, using X80M grade of steel, caliber is respectively 1219mm and 1422mm, display
Heavy caliber, high pressure gas transmission line have broad application prospects, heavy caliber, high pressure Transmission Pipeline Construction are modern high
Effect, the basic characteristics of low cost long distance conveying, in order to ensure that pipe safety, the pipe line steel of heavy caliber high pressure power have more toughness
Strict requirements, such as Sino-Russian Dong Xianguandao use Φ 1422mm caliber, and design distribution pressure reaches 12MPa, -20 DEG C of Charpy impacts
Function requirement >=210J, steel plate thickness use 21.4/25.7/30.8mm, and the production difficulty of steel plate is very big, and the specification pipe line steel exists
It is proof strength when production with plate difference≤60MPa requirement, generally taking rolled plate, the methods cut off guarantee more end to end
Intensity is poor with plate, simultaneously as rolled plate has reached 4500mm, rolling is spreaded than big, and big plate " pregnant " problem is (end to end
It is narrow, middle part is wide) trimming amount caused by problem is big, the lumber recovery of steel plate 88% hereinafter, production waste is more, cost also compared with
It is high.
Pipe line steel is widely used in the transportation arts such as petroleum, natural gas, the coal gas energy, and the direct relation national economic development is very
To national energy strategic security, major iron and steel enterprise increasingly payes attention to the research and development and production of pipe line steel.X80 grades of pipeline hot rolled coils
The needs of plate is to meet pipe line steel Xiang Kang great pressure and heavy caliber direction and the high-strength line-pipe steel developed, thickness specification are
The X80 grade hot-rolled coil huge market demand of 18.4mm~22mm.The production of X80 grades of pipeline hot-rolled coils, is mainly adopted at present
With hot rolling technology, wherein hot-rolled process mainly includes heating, rolling and cools down three main processes, and wherein heating process is
Pipe line steel produces the most key one of technology controlling and process link.In commercial process, base tail portion among X80 grades of hot-rolled coils
Temperature drop is larger, i.e., and 40 DEG C lower than head temperature of slab tail temperature or so, since X80 grades of hot-rolled coils of think gauge are rolled using constant speed
System, coil of strip along its length unstable mechanical property, and coil of strip tail portion mechanical property low so as to cause roll bending coiling temperature hit rate
It can be relatively low or unqualified, it is difficult to meet the needs of client.
The method that Wide and Thick Slab improves lumber recovery focuses mostly on to be controlled in rolled plate shape, reduces circular arc, dovetail and side end to end
Steel plate resection caused by portion's convex or concave is larger is big, such as patent CN106311757B, CN104747891B and
CN102974624B etc. belongs to this kind.And at present using TMCP technique (ThermoMechanicalControlProcess:
Thermomechanical control technique) it is exactly in the hot rolling, in the controlled rolling of control heating temperature, rolling temperature and drafts
(ControlRolling) on the basis of, then implement air-cooled or control cooling and accelerate cooling (AcceleratedCooling)
Technology but for how to be reduced under TMCP technique because rolling " blackhead " and accelerate it is cooling caused by end to end within the scope of long length by force
Degree fluctuation is big, needs just to can guarantee the research of the decline of lumber recovery caused by same plate intensity homogeneity then by increasing resection length
Do not find.The present invention is therefore.
Summary of the invention
The application is intended to provide a kind of X80 pipe line steel slab controlling hot rolling method, to solve the problems of the prior art.
To achieve the goals above, according to the one aspect of the application, a kind of X80 pipe line steel slab controlling hot rolling is provided
Method, the hot-rolled process include heating stepses, milling step and cooling step, which is characterized in that
After the milling step, when carrying out cooling step, X80 pipe line steel slab carries out passing through ACC after head is blocked
Mode is cooling, and the range that control head is blocked is the head length 3-6m of X80 pipe line steel slab, blocks water and accounts for normal water
1-95%, and the maximum transition distance for blocking water to normal water is controlled in 3-10m.
Further technical solution is that the method also includes using two rank of breaking down stage and finish rolling stage in milling step
Section rolling, start rolling temperature control between 1000~1100 DEG C, and the breaking down stage carries out high-pressure water descaling, and the breaking down stage terminates temperature
Control is at 1000 DEG C or less；The first passage of finish rolling stage carries out high-pressure water descaling, and back pass no longer carries out high-pressure water descaling, essence
The reduction ratio for rolling last 1-4 passage controls between 8~12%, and finishing temperature control is between 750~800 DEG C, when finish rolling
Between control within 75 seconds.
Further technical solution is that the range that control head is blocked is the head length 5-6m of X80 pipe line steel slab, is hidden
Water blocking amount accounts for the 1-90% of normal water, and the maximum transition distance for blocking water to normal water is controlled in 4-8m.
Further technical solution is that the range that control head is blocked is the head length 5-6m of X80 pipe line steel slab, is hidden
Water blocking amount accounts for the 10-90% of normal water, and the maximum transition distance for blocking water to normal water is controlled in 4-5m.
Further technical solution is,
The method also includes the step of cooling step carries out template aligning, the template aligning is rectified using heat and temperature correction
The mode for combining aligning carries out thermal straightening when X80 pipe line steel board briquette is more than or equal to 200 DEG C；When X80 pipe line steel slab
When temperature is less than 200 DEG C, it is straight to carry out temperature correction.
Further technical solution is that thermal straightening carries out thermal straightening after using 9 roller thermal straightening machines, ACC cooling, is aligned
Passage is 3 passages, first carries out large deformation aligning, rear to carry out small deformation aligning, wherein the drafts of control large deformation aligning is greater than
The drafts of small deformation aligning.
Further technical solution is that temperature correction is carried out after thermal straightening, and temperature correction uses 9 roller straighteners, the entrance of temperature correction
Roll gap=thickness -2mm arrives -5mm, and outlet roll gap=thickness -0mm arrives -0.8mm, and 3 passages are aligned in temperature correction.
Start rolling temperature controls between 1000~1100 DEG C, and recrystallization rolling sequence (breaking down) carries out high-pressure water descaling, just
Roll bonding beam is controlled only at 1000 DEG C, and hereinafter, non-recrystallization rolls (finish rolling) stage, only the first passage wakes up with a start high-pressure water descaling, after
Continuous passage is without high-pressure water descaling, and the reduction ratio of last three passage of finish rolling controls between 8~12%, finishing temperature control
System carries out ACC between 750~800 DEG C, after rolling and accelerates cooling, and ACC is blocked using head, and the range that head is blocked is
The head length 5-6m of X80 pipe line steel slab blocks water more than or equal to 90%, and block water to normal water transition away from
From control in 4-5m, steel plates straightening is carried out after cooling.
After adopting the above scheme, the present invention has the advantages that following prominent and effect compared with prior art:
(1) it provides a kind of effectively improve and X80 yield of steel plate and plate property is effectively reduced with the method for plate difference, with state
Interior other steel mills production X80 pipe line steel is compared, and resection reduces 500~800mm to the present invention end to end, and lumber recovery improves 2%
~3%, plate property can control within 30MPa with plate difference；
(2) reduction ratio for specifying passage on rolling final pass due to the present invention, compared with other steel mills, steel plate
Rear template is rolled to substantially improve, the nose problem of steel plate is improved well, can be not necessary to carry out preheating rectify also can guarantee it is cooling
Uniformity；
(3) compared with other steel plate factory common process, present invention employs the combination straightening process of hot strong+temperature correction, to steel
The template of plate has good effect, and the unevenness control of practical template exists in the level of 3mm/m especially for width specifications
The ultra-wide specification pipe line steel of 4000mm or more, comprehensive template effect is better, overall with unevenness can be controlled in 8mm/ overall with
It is interior；
(4) because the performance of steel plate controls within 30MPa with plate difference, and the unevenness of steel plate is controlled in the excellent of 3mm/m
The problem of different level effectively increases the precision of steel plate shearing, and the shearing of steel plate is bad, size is not hit by significantly is changed
Into the shearing fraction defective of steel plate controls within 1 ‰.
Detailed description of the invention
Fig. 1 is the steel plate finished product head metallographic structure photo of one embodiment of the present of invention.
Fig. 2 is metallographic structure photo in the middle part of the steel plate finished product of one embodiment of the present of invention.
Fig. 3 is the steel plate finished product tail portion metallographic structure photo of one embodiment of the present of invention.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
It should be noted that the description and claims of this application and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so that presently filed embodiment described herein for example can be in addition to herein
Sequence other than those of diagram or description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that
Be to cover it is non-exclusive include, for example, containing the process, method, system, product or equipment of a series of steps or units not
Those of be necessarily limited to be clearly listed step or unit, but may include be not clearly listed or for these processes, side
The intrinsic other step or units of method, product or equipment.
For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ",
" ... upper surface ", " above " etc., for describing such as a component shown in the figure or module or feature and other
The spatial relation of component or module or feature.It should be understood that spatially relative term be intended to comprising in addition to component or
Different direction in use or operation except orientation of person's module described in figure.For example, if component in attached drawing
Perhaps module is squeezed, be described as " above other component or module or construction " or " in other component or module or
On construction " component or module after will be positioned as " below other component or module or construction " or " at other
Under component or module or construction ".Thus, exemplary term " ... top " may include " ... top " and
" in ... lower section " two kinds of orientation.The component or module can also be positioned with other different modes (to be rotated by 90 ° or in other
Orientation), and respective explanations are made to the opposite description in space used herein above.
It is an object of the invention to propose a kind of method for improving X80 yield of steel plate: by the way of two-phase control rolling,
The finish rolling stage, remaining passage was not turned on high-pressure water descaling in addition to first rolling pass de-scaling, and rolling biting speed control is rolling
Acceleration appropriate is used in the process, by the control of finish rolling time within 75 seconds.Iron is oxidized at high operating temperatures, on its surface
Form one layer of fine and close iron scale (phosphorus skin).Before the rolling if this layer of iron scale cannot be removed, during the rolling process
They can be pressed into belt steel surface by roll, influence its surface quality.Steel billet in heating furnace after coming out of the stove, the oxygen of surface covering
Change iron sheet rapid cooling, pattern cracking is presented in the iron scale generated in furnace.Under the injection of high pressure water, iron scale surface
Partial Rapid-cold generates very big contraction, so that iron scale crackle be made to expand, and has part warpage.Impact through high pressure water flow,
The dynamic pressure of crackle mesohigh water becomes the static pressure of fluid and squeezes into iron scale bottom, shells iron scale from billet surface
It falls, has reached the purpose for removing iron scale.High-pressure water descaling of the present invention is that first rolling pass carries out.
It is cooling that ACC is carried out after rolling, by analyzing the temperature difference distribution situation of steel plate head, middle and end, steel plate head, middle and end
Temperature difference is bigger.When ACC is cooling in such a way that head is blocked, the length that head is blocked is controlled at 5~6 meters, is blocked
Water >=90%, that is, the actual flow after blocking are the 10% of initial set value hereinafter, simultaneously by the recovery distance setting of water
It is 4~5 meters, which considers steel plate and roll occiput temperature drop comparatively fast and most start to carry out cooling feature, reduces head
Intensity of cooling effectively reduces the intensity of steel plate head position, does not use and blocks at the middle part of steel plate and tail portion, therefore ensure that steel
The uniformity of plate overall performance reduces the performance inconsistency of position end to end.ACC is cooling by high-pressure injection section (5bar) and U-tube
Laminar cooling system composition.The amount of water sprayed used is adjusted in 3: 1~4: 1 range, maximum cooling in the case where accelerating refrigerating mode
Speed reaches 15 DEG C/s (30mm thick steel plate, 800 DEG C~500 DEG C), under direct quenching mode maximum cooling velocity reach 25 DEG C/
S (30mm thick steel plate, 800 DEG C~500 DEG C).
Steel plate, using the combination template straightening process of hot strong+temperature correction, improves the qualification rate of template after ACC is cooling,
It is rectified when steel plate temperature correction is higher using heat, the stress of steel plate is discharged, after the natural cooling of cold bed, then by the way of temperature correction
It is aligned, discharges the internal stress of steel plate sufficiently, steel plate finally template after cooling is effectively ensured.Steel plate passes through controlled rolling
Control it is cold after, temperature is at 550~650 DEG C；Thermal straightening technological temperature control of the invention is carried out at 650~1000 DEG C, the straight work of temperature correction
The control of skill temperature is carried out at 400~600 DEG C.Thermal straightening carries out thermal straightening after using 9 roller thermal straightening machines, ACC cooling, aligns
Passage is 3 passages, and straightening schemes are large deformation straightening schemes, i.e., preceding several rollers are using more much bigger than small deformation straightening schemes
Drafts makes steel obtain sufficiently large bending, to eliminate the unevenness of its original curvature, forms monodrome curvature, subsequent
Roller then uses small deformation straightening schemes.
Carry out temperature correction after thermal straightening, temperature correction equally uses 9 roller straighteners, the straightening schemes of temperature correction be entrance roll gap=
Thickness -2mm arrives -5mm, and outlet roll gap=thickness -0mm arrives -0.8mm, and 3 passages are aligned in temperature correction.
Examples 1 to 4:
The trimmed size of steel plate is 25.7 × 4360 × 12000mm, two start rolling temperature≤900 DEG C of finish rolling, finish rolling last three
The reduction ratio of passage is 9.5%, 9.4%, 8.6% respectively, and cooling using ACC, the total cooling length of ACC is 24 meters, and head is blocked
Technique be set as head and block 6 meters, water restores 5 meters of distance, and water blocks 90%, that is, blocks rear actual amount of water and be equivalent to and set
The 10% of definite value.
After ACC is cooling, using the combination straightening process of hot strong+temperature correction, finished steel plate is obtained.
For steel plate by the way of two multiple length group plates, table 1 is the lumber recovery situation of the steel plate of Examples 1 to 4, and table 2 is to implement
Situation of the steel plate finished product tensile property of example 1~4 with plate difference；Table 3 is the template data of the steel plate finished product of Examples 1 to 4；Fig. 1
~3 be steel plate finished product head, the middle part, tail portion metallographic structure photo of Examples 1 to 4.
The lumber recovery situation of the steel plate of 1 Examples 1 to 4 of table
| Embodiment | Big plate planar dimension | Finished product board size | Production board number | Practical lumber recovery |
| Embodiment 1 | 4459×25573mm | 4360×12000mm | 2 | 91.8% |
| Embodiment 2 | 4459×25897mm | 4360×12000mm | 2 | 90.6% |
| Embodiment 3 | 4459×25581mm | 4360×12000mm | 2 | 91.7% |
| Embodiment 4 | 4459×25887mm | 4360×12000mm | 2 | 90.7% |
The tensile property of the steel plate finished product of 2 Examples 1 to 4 of table
The template data of the steel plate finished product of 3 Examples 1 to 4 of table
| Embodiment | Plate size | Lateral unevenness | Longitudinal unevenness |
| Embodiment 1 | 25.7×4360×12000mm | 3mm/m | 2mm/m |
| Embodiment 2 | 25.7×4360×12000mm | 3mm/m | 3mm/m |
| Embodiment 3 | 25.7×4360×12000mm | 4mm/m | 3mm/m |
| Embodiment 4 | 25.7×4360×12000mm | 2mm/m | 2mm/m |
Find out, the pipe line steel produced using the technical program have lumber recovery high, performance is poor with plate from above embodiments
Small, the good advantage of steel plate unevenness compared with other domestic pipe line steel manufacturers there is process control to stablize, economy effect
Beneficial outstanding feature has great promotional value.
Compared with domestic other steel mills production X80 pipe line steel, resection reduces 500~800mm to the present invention end to end, becomes a useful person
Rate improves 2%~3%, and plate property can control within 30MPa with plate difference；The rear template that rolls of steel plate substantially improves, steel plate
Nose problem improved well, can be not necessary to carry out preheating and rectify also can guarantee cooling uniformity；The injustice of practical template
Degree controls the level in 3mm/m, the ultra-wide specification pipe line steel especially for width specifications in 4000mm or more, comprehensive template effect
Fruit is better, and overall with unevenness is can be controlled within 8mm/ overall with；The performance of steel plate controls within 30MPa with plate difference, and
The unevenness control of steel plate effectively increases the precision of steel plate shearing in the excellent level of 3mm/m, and the shearing of steel plate is bad, ruler
Very little the problem of being not hit by, is significantly improved, and the shearing fraction defective of steel plate controls within 1 ‰.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (7)
1. a kind of X80 pipe line steel slab controlling hot rolling method, the hot-rolled process includes heating stepses, milling step and cooling step
Suddenly, which is characterized in that
After the milling step, when carrying out cooling step, X80 pipe line steel slab is carried out after head is blocked through ACC mode
Cooling, the range that control head is blocked is the head length 3-6m of X80 pipe line steel slab, blocks the 1- that water accounts for normal water
95%, and the maximum transition distance for blocking water to normal water is controlled in 3-10m.
2. X80 pipe line steel slab controlling hot rolling method according to claim 1, which is characterized in that
The method also includes using breaking down stage and finish rolling stage two-phase control rolling in milling step, start rolling temperature control exists
Between 1000~1100 DEG C, the breaking down stage carries out high-pressure water descaling, and the breaking down stage terminates temperature control at 1000 DEG C or less；Finish rolling
The first passage of stage carries out high-pressure water descaling, and back pass no longer carries out high-pressure water descaling, the reduction ratio of the last 1-4 passage of finish rolling
Control is between 8~12%, and between 750~800 DEG C, the finish rolling time controlled within 75 seconds finishing temperature control.
3. X80 pipe line steel slab controlling hot rolling method according to claim 1, which is characterized in that
The range that control head is blocked is the head length 5-6m of X80 pipe line steel slab, blocks the 1- that water accounts for normal water
90%, and the maximum transition distance for blocking water to normal water is controlled in 4-8m.
4. X80 pipe line steel slab controlling hot rolling method according to claim 1, which is characterized in that
The range that control head is blocked is the head length 5-6m of X80 pipe line steel slab, blocks the 10- that water accounts for normal water
90%, and the maximum transition distance for blocking water to normal water is controlled in 4-5m.
5. X80 pipe line steel slab controlling hot rolling method according to claim 1, which is characterized in that
The method also includes the step of cooling step carries out template aligning, the template aligning is rectified using heat and temperature correction combination
The mode of aligning carries out thermal straightening when X80 pipe line steel board briquette is more than or equal to 200 DEG C；When X80 pipe line steel board briquette
When less than 200 DEG C, it is straight to carry out temperature correction.
6. X80 pipe line steel slab controlling hot rolling method according to claim 5, which is characterized in that
Thermal straightening carries out thermal straightening after using 9 roller thermal straightening machines, ACC cooling, aligning passage is 3 passages, is first become greatly
Shape aligning, it is rear to carry out small deformation aligning, wherein the drafts of control large deformation aligning is greater than the drafts of small deformation aligning.
7. X80 pipe line steel slab controlling hot rolling method according to claim 5, which is characterized in that
Carry out temperature correction after thermal straightening, temperature correction uses 9 roller straighteners, entrance roll gap=thickness -2mm Dao -5mm of temperature correction, out
Mouth roll gap=thickness -0mm arrives -0.8mm, and 3 passages are aligned in temperature correction.
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| CN201811449848.7A CN109487064A (en) | 2018-11-30 | 2018-11-30 | X80 pipe line steel slab controlling hot rolling method |
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| CN201811449848.7A CN109487064A (en) | 2018-11-30 | 2018-11-30 | X80 pipe line steel slab controlling hot rolling method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115537647A (en) * | 2021-06-30 | 2022-12-30 | 宝山钢铁股份有限公司 | High-toughness, low-yield-ratio and low-longitudinal-transverse-strength anisotropic 600 MPa-grade steel plate and manufacturing method thereof |
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| CN102671941A (en) * | 2012-06-11 | 2012-09-19 | 南京钢铁股份有限公司 | Process for producing thin gauge pipeline steel by using double-stand medium and heavy plate mill |
| KR20140130325A (en) * | 2013-04-30 | 2014-11-10 | 현대제철 주식회사 | Hot-rolled steel sheet and method of manufacturing the same |
| CN104018060A (en) * | 2014-05-23 | 2014-09-03 | 内蒙古包钢钢联股份有限公司 | Guaranteed crack detection and guaranteed performance Q345B steel plate with thickness of 150mm and production method thereof |
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| CN107974614A (en) * | 2017-11-23 | 2018-05-01 | 武汉钢铁有限公司 | The production method of the X80 level pipe line steels of resistance against hydrogen cracking |
| CN107983784A (en) * | 2017-11-29 | 2018-05-04 | 江苏省沙钢钢铁研究院有限公司 | Method for improving performance uniformity of hot-rolled steel plate |
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| CN115537647A (en) * | 2021-06-30 | 2022-12-30 | 宝山钢铁股份有限公司 | High-toughness, low-yield-ratio and low-longitudinal-transverse-strength anisotropic 600 MPa-grade steel plate and manufacturing method thereof |
| CN115537647B (en) * | 2021-06-30 | 2023-10-13 | 宝山钢铁股份有限公司 | High-toughness, low-yield ratio and low-longitudinal-transverse-strength anisotropic 600 MPa-grade steel plate and manufacturing method thereof |
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