CN111974812B - Production method of super-thick steel plate - Google Patents
Production method of super-thick steel plate Download PDFInfo
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- CN111974812B CN111974812B CN202010659607.6A CN202010659607A CN111974812B CN 111974812 B CN111974812 B CN 111974812B CN 202010659607 A CN202010659607 A CN 202010659607A CN 111974812 B CN111974812 B CN 111974812B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0071—Levelling the rolled product
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- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a production method of an extra-thick steel plate, which utilizes the existing equipment of a heat treatment line and a rolling line to realize surface cleaning and plate shape correction without adding surface treatment equipment and straightening and flattening equipment, so that on one hand, a large amount of equipment investment cost can be saved, on the other hand, the unevenness of the whole steel plate after being flattened is less than or equal to 8mm, the unevenness of 2m is less than or equal to 4mm/2m, the unevenness of 1m is less than or equal to 2mm/1m, the plate shape is excellent, and the surface of the steel plate after being treated is covered with uniform and compact iron scales, thereby ensuring the good corrosion resistance of the steel plate while ensuring the surface quality. Therefore, the produced super-thick steel plate has higher surface quality and higher flatness, and the requirements of users on the super-thick steel plate are met.
Description
Technical Field
The invention relates to a method for producing a steel plate, in particular to a method for producing an extra-thick steel plate.
Background
Generally, a steel plate with the thickness of more than or equal to 100mm is called an extra-thick steel plate, is widely applied to the fields of machinery manufacturing, wind power generation, turbo generator sets, nuclear power, ocean platforms and the like, and has remarkable economic and social benefits. In general, in order to obtain a super-thick steel sheet having a fine structure and uniform properties, the steel sheet is subjected to normalizing treatment after hot rolling. Because of the thick thickness, heavy weight and long heating and heat preservation time of the super-thick steel plate, steel plants usually carry out normalizing treatment in heat treatment furnaces such as a trolley furnace, a pit furnace and the like. The heat treatment furnace generally adopts mixed gas or natural gas as energy and has no gas protection, so that after long-time heating and heat-preserving normalizing treatment, very thick iron scales are generated on the surface of the steel plate, the iron scales are loose and peeled, and are difficult to effectively clean, and the subsequent flaw detection, processing and manufacturing application of the steel plate are directly influenced. If the surface is polished or the oxide scales are cleaned by shot blasting, the steel plate matrix is directly exposed, and the corrosion resistance is greatly reduced.
In addition, because of the thick thickness of the super-thick steel plate, if the defect of poor plate shape occurs after normalizing, the super-thick steel plate cannot be straightened by a conventional straightening machine, and can only be flattened by a high-pressure flattening machine, so that the requirement on equipment is high, the production efficiency is low, the operation strength is high, and the straightening yield is very low.
There is no feasible and easy-to-operate solution for normalized delivery steel sheets that place high demands on surface quality or sheet profile. Thus, customer complaints of ultra-thick steel plates caused by surface and plate shape quality problems frequently occur.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects of the prior art, the invention provides a production method of an ultra-thick steel plate, which can effectively control the surface quality and the plate shape quality of the ultra-thick steel plate.
The technical scheme is as follows: the invention relates to a production method of an ultra-thick steel plate, which comprises the following steps:
(1) heating the blank and then hot rolling to obtain a steel plate;
(2) after finishing the steel plate, normalizing by using a naked flame according to a normalizing parameter specification corresponding to the steel grade, and controlling the normalizing heat preservation temperature to be more than 850 ℃;
(3) after the heat preservation is finished, the steel plate is quickly transferred to a rolling line roller way of a rolling production line, and the surface temperature of the steel plate is ensured to be above 650 ℃ when the steel plate is transferred to the rolling line;
(4) according to the descaling height required by the rolling of the steel billets with the same thickness, adjusting the descaling height of a rough descaling machine to the same position in advance, adjusting the descaling pressure to be more than 15MPa, and opening descaling water;
(5) conveying the steel plate through a rough descaling machine by using a roller way, and performing rough descaling treatment on the steel plate for one time;
(6) after rough descaling is finished, the roller way transports the steel plate to the front of a rolling mill, and the position of the blank is clamped and centered by utilizing a side guide plate of the rolling mill;
(7) adjusting the height of the roll surface of the roll to the position of a rolling line, adjusting the roll gap of the rolling mill to the thickness of a steel plate with the thickness of +3mm, and turning off the sled control;
(8) conveying the steel plate through a rolling mill, simultaneously observing the condition of the rolling force, and adjusting the rolling force to be in the range of 500-800 t by adjusting the roll gap value; after the parameters are adjusted, carrying out three times of longitudinal leveling on the steel plate, wherein fine descaling is carried out during the first time of leveling;
(9) and after the leveling is finished, cooling the steel plate to room temperature.
Specifically, the blank is any one of a steel ingot, a composite blank and an electroslag remelting blank of a target super-thick steel plate steel grade.
In particular, in the step (2), the shot blasting process is not performed when finishing the steel sheet.
In the step (2), the open flame furnace is any one of a car-type heat treatment furnace, a pit-type heat treatment furnace, an external mechanical heat treatment furnace, a roller furnace and a resistance heating furnace.
Further, in the step (8), when the length of the steel plate is smaller than that of the roller, after the longitudinal leveling is finished, the steel plate is rotated by 90 degrees by using a steel rotating roller way, then the steel plate is transversely leveled for three times, and fine descaling is performed on the steel plate for the first time.
Further, in the step (9), after the transverse leveling is finished, the steel plate is turned to a state before leveling, and the steel plate is conveyed to a cooling bed or an independent cooling rack for cooling.
Has the advantages that: compared with the prior art, the method realizes surface cleaning and plate shape correction by utilizing the existing equipment of the heat treatment line and the rolling line under the condition of not increasing surface treatment equipment and straightening and flattening equipment, on one hand, a large amount of equipment investment cost can be saved, on the other hand, the unevenness of the whole flattened steel plate is less than or equal to 8mm, the unevenness of 2m is less than or equal to 4mm/2m, the unevenness of 1m is less than or equal to 2mm/1m, the plate shape is excellent, and the surface of the treated steel plate is covered with uniform and compact iron oxide scales, so that the steel plate has good corrosion resistance while the surface quality is ensured. Therefore, the produced super-thick steel plate has higher surface quality and higher flatness, and the requirements of users on the super-thick steel plate are met.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention will be described in more detail with reference to the following examples of Q345D extra thick steel plate with the specification of 250X 2500X 4000mm in a certain steel mill.
1. And heating and hot rolling the steel billet to obtain the extra-thick steel plate needing further heat treatment. The billet raw material of the super-thick steel plate can be steel ingots, composite billets, electroslag remelting billets and the like, and the steel type is not limited. For the Q345D super-thick steel plate in the embodiment, the steel billet is a welded composite billet prepared by taking a Q345D continuous casting billet as a raw material, and the welded composite billet is heated and then hot-rolled to obtain a 250mm Q345D hot-rolled steel plate.
2. The hot rolled steel sheet is subjected to finishing treatment and then transferred to a heat treatment line. In particular, the super-thick steel plate does not need to be shot-blasted.
3. And (4) normalizing by using a naked flame furnace. The open furnace may be a car-type heat treatment furnace, a pit-type heat treatment furnace, an external mechanized heat treatment furnace, a roll furnace, a resistance heating furnace, or the like. In the embodiment, the normalizing treatment is carried out by using the trolley type heat treatment furnace, and the mixed gas is used as the energy, so that no gas protection is provided, because the non-oxidation protection treatment is not required when the normalizing treatment is carried out by using the open-flame furnace in the method.
The normalizing process was performed as follows:
4. after heat preservation, the steel plate is transported to the rolling production line, and the transportation time needs to be shortened as far as possible in the transportation process, and the loss of steel temperature is reduced.
Here, the transportation mode can be realized by adopting automobile transportation with a heat preservation cover, roller transportation or by constructing a heat treatment furnace near a rolling line.
In the embodiment, an automobile with a heat preservation cover is transported to a rolling line of a 5000mm rolling mill. When the steel plate is transferred to a rolling line, the surface temperature of the steel plate is 750 ℃.
5. And after the steel plate is transferred to a rolling line, the steel plate is lifted to a rolling line roller way and is transferred to the front of a rough descaling machine.
6. And adjusting the descaling height of the rough descaling to a proper position in advance, wherein the descaling height is the same as the descaling height required by the rolling of the billet with the same thickness and is 352 mm.
And adjusting the descaling pressure to 25MPa, and opening the descaling water.
7. And conveying the steel plate through a roller way to pass through a rough descaling machine, and performing rough descaling treatment on the iron scale on the surface of the steel plate in one pass.
8. And after the rough descaling is finished, the roller way transports the steel plate to the front of the rolling mill.
9. And (4) clamping the blank position by utilizing a side guide plate of the rolling mill to be aligned.
10. Adjusting the height of the roller surface of the roller to the position of a rolling line in advance, namely the working roller surface is horizontal to the roller way surface; and adjusting the roll gap of the rolling mill to 253mm, and turning off the sled control.
11. And conveying the steel plate through a rolling mill, observing the rolling force condition, and adjusting the rolling force to a force range of 500t-800t by adjusting the roll gap value.
12. After the parameters are adjusted, the steel plate is longitudinally leveled by a rolling mill for three times, wherein fine descaling is carried out during the first leveling.
13. And after the longitudinal leveling is finished, rotating the steel plate by 90 degrees by using a steel rotating roller way, and then performing three times of transverse leveling on the steel plate by using a rolling mill, wherein the first time is used for fine descaling.
14. And after finishing leveling, turning the steel to an original state, conveying the steel to a machine, and then lifting the steel to a slow cooling rack to cool the steel to room temperature.
15. After cooling to room temperature, the surface, plate shape and performance of the steel plate are tested. Through inspection, the steel plate has excellent performance and meets the standard requirement; the surface iron scale is compact without color difference and peeling; the unevenness of the whole steel plate, the unevenness of 2m and the unevenness of 1m are respectively 6 mm/whole plate, 4mm/2m and 1mm/1 m.
Claims (10)
1. The production method of the super-thick steel plate is characterized by comprising the following steps:
(1) heating the blank and then hot rolling to obtain a steel plate;
(2) after finishing the steel plate, normalizing by using a naked flame according to a normalizing parameter specification corresponding to the steel grade, and controlling the normalizing heat preservation temperature to be more than 850 ℃;
(3) after the heat preservation is finished, the steel plate is rapidly transferred to a rolling line roller way of a rolling production line, and the surface temperature of the steel plate is ensured to be above 650 ℃ when the steel plate is transferred to the rolling line;
(4) according to the descaling height required by rolling of the steel billets with the same thickness, adjusting the descaling height of a rough descaling machine to the same position in advance, adjusting the descaling pressure to be more than 15MPa, and opening descaling water;
(5) conveying the steel plate through a rough descaling machine by using a roller way, and performing rough descaling treatment on the steel plate for one time;
(6) after rough descaling is finished, conveying a steel plate to the front of a rolling mill by a roller way, and clamping and centering the blank position by utilizing a side guide plate of the rolling mill;
(7) adjusting the height of the roll surface of the roll to the position of a rolling line, adjusting the roll gap of the rolling mill to the thickness of a steel plate with the thickness of +3mm, and turning off the sled control;
(8) conveying the steel plate through a rolling mill, simultaneously observing the condition of the rolling force, and adjusting the rolling force to be in the range of 500-800 t by adjusting the roll gap value; after the parameters are adjusted, carrying out three times of longitudinal leveling on the steel plate, wherein fine descaling is carried out during the first time of leveling;
(9) and after the leveling is finished, cooling the steel plate to room temperature.
2. The method for producing an extra thick steel plate according to claim 1, wherein the slab is any one of an ingot, a composite slab, and an electroslag remelting slab of a target extra thick steel plate grade.
3. A method of producing a super thick steel plate according to claim 1, wherein in said step (2), shot blasting is not performed at the time of finishing treatment of the steel plate.
4. The method for producing a super thick steel plate as set forth in claim 1, wherein in the step (2), the open-hearth furnace is any one of a car-type heat treatment furnace, a pit-type heat treatment furnace, an external mechanical heat treatment furnace, a roll furnace and a resistance heating furnace.
5. The method for producing the super-thick steel plate according to claim 1, wherein in the step (8), when the length of the steel plate is less than that of the roller, after the longitudinal leveling is finished, the steel plate is rotated by 90 degrees by using a steel rotating roller way, and then the steel plate is subjected to three times of transverse leveling, wherein the first time is subjected to fine descaling.
6. The method for producing a super thick steel plate as set forth in claim 5, wherein in said step (9), after the transverse leveling is finished, the steel is turned to a pre-leveling state and the steel plate is transferred to a cooling bed or a separate cooling stand to be cooled.
7. The method for producing an extra thick steel plate according to claim 1, wherein the steel grade of the extra thick steel plate is Q345D, and the blank is a welded composite blank prepared from a continuous casting slab.
8. A method for manufacturing an ultra-thick steel sheet as claimed in claim 7, wherein the thickness after hot rolling is 250mm, and the normalizing parameter control comprises: the temperature of the steel charging hearth of the open-fire furnace is controlled to be 400 ℃, and the holding time is 60-120 min.
9. A method for producing super thick steel plates as claimed in claim 8, wherein the hearth heating rate after charging is controlled to 80 ℃/h.
10. The production method of a super thick steel plate as set forth in claim 8, wherein the normalizing parameter control further comprises: the soaking and heat preservation temperature is controlled to be 900 +/-10 ℃, the soaking and heat preservation time is controlled according to 2.0Hmin, wherein H is the thickness of the steel plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010659607.6A CN111974812B (en) | 2020-07-09 | 2020-07-09 | Production method of super-thick steel plate |
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| CN202010659607.6A CN111974812B (en) | 2020-07-09 | 2020-07-09 | Production method of super-thick steel plate |
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| CN111974812B true CN111974812B (en) | 2022-08-19 |
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| CN114669621B (en) * | 2022-03-23 | 2024-03-08 | 中铝材料应用研究院有限公司 | Aluminum alloy super-thick plate and preparation method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006181628A (en) * | 2004-12-28 | 2006-07-13 | Jfe Steel Kk | Method for rolling thick steel plate and method for producing thick steel plate |
| CN102080182A (en) * | 2010-12-27 | 2011-06-01 | 南阳汉冶特钢有限公司 | High-strength steel plate Q460GJE-Z35 for extra-thick high-rise building structure and production method thereof |
| CN102513383A (en) * | 2011-12-09 | 2012-06-27 | 东北大学 | Ultra fast cooling and conventional laminar flow cooling method for medium plate |
| CN103160666A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | Method for manufacturing of low-cost super-thick steel plate by short process |
| CN103272863A (en) * | 2013-06-21 | 2013-09-04 | 济钢集团有限公司 | Method and system for automatically controlling heavy plate mill to accurately remove scales |
| CN103506382A (en) * | 2013-07-31 | 2014-01-15 | 秦皇岛首秦金属材料有限公司 | Production method for improving surface quality of thick-standard ship plate |
| CN105195525A (en) * | 2014-06-25 | 2015-12-30 | 宝山钢铁股份有限公司 | Combined rolling method capable of improving plan view pattern control |
-
2020
- 2020-07-09 CN CN202010659607.6A patent/CN111974812B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006181628A (en) * | 2004-12-28 | 2006-07-13 | Jfe Steel Kk | Method for rolling thick steel plate and method for producing thick steel plate |
| CN102080182A (en) * | 2010-12-27 | 2011-06-01 | 南阳汉冶特钢有限公司 | High-strength steel plate Q460GJE-Z35 for extra-thick high-rise building structure and production method thereof |
| CN102513383A (en) * | 2011-12-09 | 2012-06-27 | 东北大学 | Ultra fast cooling and conventional laminar flow cooling method for medium plate |
| CN103160666A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | Method for manufacturing of low-cost super-thick steel plate by short process |
| CN103272863A (en) * | 2013-06-21 | 2013-09-04 | 济钢集团有限公司 | Method and system for automatically controlling heavy plate mill to accurately remove scales |
| CN103506382A (en) * | 2013-07-31 | 2014-01-15 | 秦皇岛首秦金属材料有限公司 | Production method for improving surface quality of thick-standard ship plate |
| CN105195525A (en) * | 2014-06-25 | 2015-12-30 | 宝山钢铁股份有限公司 | Combined rolling method capable of improving plan view pattern control |
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