CN111804729A - Method for producing medium and extra-thick plates through steel plate blanks under high-performance prepressing - Google Patents
Method for producing medium and extra-thick plates through steel plate blanks under high-performance prepressing Download PDFInfo
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- CN111804729A CN111804729A CN202010641795.XA CN202010641795A CN111804729A CN 111804729 A CN111804729 A CN 111804729A CN 202010641795 A CN202010641795 A CN 202010641795A CN 111804729 A CN111804729 A CN 111804729A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 28
- 239000010959 steel Substances 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 57
- 230000009467 reduction Effects 0.000 claims abstract description 45
- 238000009749 continuous casting Methods 0.000 claims abstract description 28
- 238000003825 pressing Methods 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000004806 packaging method and process Methods 0.000 claims abstract description 4
- 238000007906 compression Methods 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 7
- 238000001953 recrystallisation Methods 0.000 claims description 7
- 238000007711 solidification Methods 0.000 claims description 6
- 230000008023 solidification Effects 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 5
- 238000009628 steelmaking Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000009966 trimming Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
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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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
-
- 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/024—Forging or pressing
-
- 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/026—Rolling
-
- 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/06—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing in a non-continuous process, e.g. triplet mill, reversing mill
-
- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B2001/022—Blooms or billets
-
- 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B2001/028—Slabs
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention provides a method for producing medium and extra-thick plates by prepressing a steel plate blank with high performance, which comprises the following steps: (1) steel making, (2) continuous casting, heavy reduction and high-temperature rolling, (3) heating, (4) controlled rolling and controlled cooling, and (5) trimming and packaging. The invention adopts a technology for producing medium and extra-thick plates by using high-performance pre-pressing slabs, can use a conventional rolling mill with small rolling force to replace an original heavy rolling mill with large rolling force to produce high-performance medium and extra-thick plates, and avoids the huge investment in the heavy medium and heavy plate rolling mill with large rolling force and the matched large-section steelmaking continuous casting equipment and the like for producing thick steel plates, only a group of overweight pressing equipment needs to be added on the original continuous casting machine, and the pre-pressing slabs with high performance, high density, few defects and conventional sizes are obtained by high-temperature rolling.
Description
Technical Field
The invention belongs to the technical field of steel smelting, and relates to a method for producing medium and extra-thick plates by prepressing steel slabs with high performance.
Background
The medium and extra thick plates are used in the fields of pressure containers, oil refining equipment, pipelines, electric power, ships, ocean platforms, low-temperature hydrogen-contacting and wear-resisting machinery and the like, have extremely high requirements on the performance of flaw detection, strength, impact and the like, are produced mainly by a large medium plate rolling mill of about 10000 tons at present, improve the defect tissue in the middle of a plate blank by increasing the section of the plate blank and the high compression ratio at low temperature and high pressure, and ensure the mechanical performance and flaw detection indexes of the medium and extra thick plates. However, for a rolling mill with a conventional tonnage, due to small rolling force and limited equipment, a large-section slab cannot be rolled into a medium and extra-thick plate with qualified performance through high reduction and high compression ratio, and the large-section rolling mill is built through investment or the existing rolling mill is reformed to increase the tonnage of the rolling mill, and meanwhile, the large-section slab continuous casting machine is matched with the large-section slab continuous casting machine, so that the large-section slab continuous casting machine becomes a necessary way for producing the medium and extra-thick plate at present. But in the current environment with a soft steel market, enterprises need to invest large capital, the cost is high, and the risk is huge.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for producing medium and extra-thick plates by prepressing steel slabs with high performance.
Therefore, the invention adopts the following technical scheme:
a method for producing medium and extra-thick plates by using steel slabs under high-performance prepressing comprises the following steps:
(1) making steel to obtain a square billet;
(2) continuously casting the square billet by a continuous casting machine to obtain the following sectional areas: the method comprises the following steps of (1) adding an overweight reduction device on a continuous casting machine to carry out heavy pressing and rolling operation at high temperature of the slab after continuous casting, wherein the thickness and the width are =300mm 1240 mm-1580 mm and 220mm 1240 mm-1580 mm, and specifically comprises the following steps: controlling the temperature drop of the continuously cast slab, and performing rolling deformation under a heavy pressing device in a deformation temperature interval near the final solidification point of the continuously cast slab, namely a high-temperature viscoplastic deformation interval with the slab center temperature of 1250-;
(3) heating the obtained high compression ratio plate blank after entering a furnace;
(4) controlling rolling and cooling of the heated high-compression-ratio plate blank to obtain a plate;
(5) and (5) cutting edges of the plates and then packaging.
Further, in the continuous casting operation in the step (2), the crystallizer of the continuous casting machine is in corner arc transition.
Further, the high compression ratio regular-size square billet is subjected to three-stage heating in the step (3).
Further, in the controlled rolling and controlled cooling operation in the step (4), the heated high compression ratio slab is rolled in two stages of a recrystallization zone and a non-recrystallization zone, and the rolled plate is rapidly cooled to the temperature of the phase change point, so that a finished plate is obtained.
Further, in the step (2), when the slab with the thickness and the width =300mm 1240 mm-1580 mm is rolled to the slab with the thickness of 220mm 1240-1580 mm, the rolling passes are light reduction, heavy reduction, small reduction, large reduction and large reduction, and finally small reduction flattening passes, wherein the rolling schedule is as follows: thickness:
300mm-290mm-295mm-290mm-280mm-265mm-245mm-225mm-218mm。
further, in the step (2), when the slab with the thickness and the width =220mm 1240 mm-1580 mm is rolled to the slab with the thickness of 160mm 1240-1580 mm, the rolling schedule of the flattening pass is as follows: thickness:
220mm-218mm-215mm-210mm-200mm-185mm-165mm-158mm。
the invention has the beneficial effects that:
(1) the technology for producing medium and extra thick plates by using a high-performance pre-pressing plate blank can replace the original heavy rolling mill with large rolling force to produce the high-performance medium and extra thick plates by using a conventional rolling mill with small rolling force, avoids the huge investment in the heavy medium and heavy plate rolling mill with large rolling force and the matched large-section steelmaking continuous casting equipment and the like for producing the thick steel plates, only needs to add a group of overweight pressing equipment on the original continuous casting machine, obtains the pre-pressing plate blank with high performance, high density, few defects and conventional size by high-temperature rolling, and can obtain the medium and extra thick steel plates exceeding the designed thickness specification of the rolling mill on the original conventional rolling mill by using the conventional medium and heavy plate rolling process.
(2) The technology for producing the medium and extra-thick plates by using the high-performance pre-pressed plate blanks makes full use of the heat of the steel blanks in the continuous casting process, the steel blanks in the large specification are directly rolled into the plate blanks in the conventional specification without heating, and the pre-pressed plate blanks in the conventional specification and size, but not the large-specification plate blanks, in the heating furnace are heated to 1200 ℃, so that the heating time, the energy consumption and the burning loss are reduced.
(3) And (3) implementing viscoplasticity deformation of the core structure of the high-temperature viscoplasticity area by utilizing the external cold and internal heat states of the continuous casting billet, thereby realizing reduction of deformation energy consumption and improvement of the casting billet structure.
(4) The load distribution of the conventional rolling mill is fully reduced, and the plate blanks with smaller sizes are punched to produce plates with high compression ratio on the conventional rolling mill, so that the product performance is improved, the time yield of the rolling mill is improved, and the production cost is reduced.
Detailed Description
The present invention will be explained in detail with reference to examples.
A method for producing medium and extra-thick plates by using steel slabs under high-performance prepressing comprises the following steps:
(1) the method comprises the following steps of obtaining a square billet through conventional steelmaking operation, wherein the local billet is suitable for conventionally produced low alloy steel, the smelting composition requirement is met, the total alloy content is controlled to be not higher than 3.0%, the solidification speed is reduced due to too high alloy amount, the thickness of a billet shell is reduced, the risk of steel leakage can be caused in heavy-pressure operation, high-quality molten iron is selected for smelting, the high-quality molten iron is smelted in a converter and then enters a refining furnace, and the harmful element S + P is controlled to be not more than 0.020%;
(2) continuously casting a square billet, wherein a continuous casting crystallizer used for continuous casting is in corner arc transition, molten steel of a continuous casting process is firstly adopted for protective casting during continuous casting, the casting superheat degree is controlled to be 15-30 ℃, the billet drawing speed is 0.80-1.0m/min, a billet plate with the sectional area of 160mm and 1240-1580 mm or 220mm and 1240-1580 mm is obtained after the continuous casting is finished, then a group of heavy reduction equipment is additionally arranged on a continuous casting machine, the heavy pressing and high-temperature rolling operation of the billet after the continuous casting is carried out, specifically, two overweight pressing devices are arranged, the pressing amount and the cooling system of the pressing equipment are adjusted according to the target thickness and the solidification state of a billet shell, the core part is compressed while the core part is forced to float impurities, the internal purity of the billet is improved, and the billet is externally drawn at 0.6-1.2m/min, the drawn thick plate blank presents an internal heat and external cold state, namely the internal melting state-external solidification of the blank forms enough blank shell, one group of two devices under heavy pressure is arranged, the first device is under light pressure, the second device is under heavy pressure, the length of the light pressure is 2.0-2.5 m under heavy pressure, then the plate blank after heavy pressure is carried out high temperature rolling operation, firstly the temperature drop is controlled, the rolling deformation under heavy pressure is carried out in a deformation temperature interval near the final solidification point of the plate blank after continuous casting, namely, in a high temperature viscoplasticity deformation interval with the plate blank core temperature of 1250 ℃1450 ℃, namely, the shell of the plate blank is rolled in the high temperature area 1050 ℃ -1250 ℃, the heavy pressed thick plate blank is subjected to high temperature viscoplasticity rolling deformation on a group of conventional rolling mills, and is subjected to different rolling passes (totally adopting 5 rolling mills), the first small rolling is adopted, the plate blank temperature is the highest, the core part has partial liquid phase, if the high reduction is adopted, the risk of steel leakage can be generated, the inclusion can be extruded and floated upwards under the low reduction, the length of a dendritic crystal is damaged, the internal quality of a billet is improved, then the high reduction is carried out, the liquid phase of the core part is almost zero due to the gradual reduction of the temperature, the internal defects of the billet can be effectively pressed under the high reduction, then the high reduction is continued, the rolling force can be effectively ensured to gradually permeate into the casting billet under the high reduction, the defects such as pressing looseness, looseness and hollowness and the like are changed to the maximum degree, the internal quality is greatly improved, finally, the low reduction is a leveling pass, and the final;
finally, rolling the plate blanks with the thickness of 300mm 1240 mm-1580 mm and the thickness of 220mm 1240 mm-1580 mm to respectively obtain high-compression-ratio conventional-size plate blanks with the specification of 220mm 1240-1580 mm or 160mm 1240-1580 mm;
specifically, square billets with the cross sections of 300mm are heavily pressed to 220mm, and the flattening passes of light pressing, heavy pressing, small pressing, large pressing and large pressing are adopted, wherein the pressing system is as follows:
thickness: 300mm-290mm-295mm-290mm-280mm-265mm-245mm-225mm-
218mm (Table 1);
TABLE 1300 mm high-performance prepressing blank pressing system
The method comprises the following steps of carrying out heavy reduction on square billets with the cross sections of 220mm respectively, pressing the square billets to 160mm, and adopting a flattening pass reduction system of light reduction, heavy reduction, small reduction, large reduction and final small reduction as follows:
thickness: 220mm-218mm-215mm-210mm-200mm-185mm-165mm-158mm (Table 2);
table 2220 mm high-performance pre-pressing blank pressing system
As can be seen from tables 1 and 2, the "soft reduction", "heavy reduction", "small reduction" and "large reduction" in the system are all self-defined, and the reduction amount and the reduction rate are from small to large, which are completely opposite to the reduction system in the traditional rolling process;
(3) heating the plate blank with the conventional size and the high compression ratio, specifically, heating the square blank with the conventional size and the high compression ratio in a three-stage manner to 1180-1230 ℃, and keeping the temperature for 3.5-4.5 hours, wherein the heating can be used for preventing the crystal grains of the square blank with the conventional size and the high compression ratio from being coarsened;
(4) rolling and cooling control are carried out on the heated high-compression-ratio conventional-size plate blank, specifically, two stages of a recrystallization region and a non-recrystallization region of the heated high-compression-ratio conventional-size square blank are subjected to rolling operation, specifically, the rolling temperature in the first stage is 1050 ℃ and 1100 ℃, and when the temperature and the thickness are 2.5-3 times of the specification of a finished product, the accumulated deformation zone of the non-recrystallization region in the low-temperature stage is increased by adopting a mode of increasing the rolling thickness; the rolling temperature of the second stage is 900-;
(5) and finally, cutting edges of the finished plate, spraying, printing, packaging and warehousing.
Claims (6)
1. A method for producing medium and extra-thick plates by using steel slabs under high-performance prepressing is characterized by comprising the following steps:
(1) making steel to obtain a square billet;
(2) continuously casting the square billet by a continuous casting machine to obtain the following sectional areas: the method comprises the following steps of (1) adding an overweight reduction device on a continuous casting machine to carry out heavy pressing and rolling operation at high temperature of the slab after continuous casting, wherein the thickness and the width are =300mm 1240 mm-1580 mm and 220mm 1240 mm-1580 mm, and specifically comprises the following steps: controlling the temperature drop of the continuously cast slab, and performing rolling deformation under a heavy pressing device in a deformation temperature interval near the final solidification point of the continuously cast slab, namely a high-temperature viscoplastic deformation interval with the slab center temperature of 1250-;
(3) heating the obtained high compression ratio plate blank after entering a furnace;
(4) controlling rolling and cooling of the heated high-compression-ratio plate blank to obtain a plate;
(5) and (5) cutting edges of the plates and then packaging.
2. The method for manufacturing an extra-thick steel plate by prepressing a steel slab with high performance according to claim 1, wherein the continuous casting mold is rounded at the corner in the continuous casting operation in the step (2).
3. The method for producing an extra-medium plate from a slab of high-performance pre-pressed steel as claimed in claim 1, wherein the high-compression ratio regular-size square billet is heated in three stages in the step (3).
4. The method for manufacturing medium and extra thick steel plates from steel slabs with high performance prepressing according to claim 1, wherein the controlled rolling and controlled cooling operation of the step (4) is performed by performing a rolling operation in two stages of a recrystallization zone and a non-recrystallization zone of the heated high compression ratio slab, and rapidly cooling the rolled plate to the transformation temperature to obtain a finished plate.
5. The method for manufacturing the extra-thick steel plate by using the steel plate blank under the high-performance prepressing as claimed in claim 1, wherein in the step (2), when the plate blank with the thickness and the width =300mm 1240 mm-1580 mm is rolled to the plate blank with the thickness of 220mm 1240-1580 mm, the soft reduction, the heavy reduction, the small reduction, the large reduction and the final flattening pass of the large reduction are adopted, and the rolling schedule is as follows: thickness: 300mm-290mm-295mm-290mm-280mm-265mm-245mm-225mm-218 mm.
6. The method for manufacturing medium and extra thick plates by prepressing a steel slab with high performance according to claim 1, wherein in the step (2), when the slab with thickness x width =220mm x 1240 mm-1580 mm is rolled to a slab with thickness x 1240 mm-1580 mm, the reduction schedule of the flattening passes of soft reduction, heavy reduction, small reduction, large reduction and final small reduction is as follows: thickness: 220mm-218mm-215mm-210mm-200mm-185mm-165mm-158 mm.
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Application publication date: 20201023 |