CN113617836A - Rolling process for producing low-energy-consumption headless ferrite strip steel - Google Patents
Rolling process for producing low-energy-consumption headless ferrite strip steel Download PDFInfo
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- CN113617836A CN113617836A CN202110683050.4A CN202110683050A CN113617836A CN 113617836 A CN113617836 A CN 113617836A CN 202110683050 A CN202110683050 A CN 202110683050A CN 113617836 A CN113617836 A CN 113617836A
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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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
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- 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
- B21B45/004—Heating the product
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Abstract
The invention provides a rolling process for producing low-energy consumption endless ferritic strip steel, which mainly comprises the steps of continuous casting machine continuous rolling, rough rolling dephosphorization, two-frame rough rolling, pendulum shearing, pushing out of a stacker, finish rolling descaling, five-frame finish rolling, laminar cooling and coiling by an underground coiler. In the rolling process, the condition that the heat history of the sheet continuous casting and rolling production line is low is fully utilized, the disadvantages are converted into advantages, the surface quality and the performance of the strip steel are effectively improved, and the obtained strip steel can replace cold-rolled steel.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a rolling process for producing low-energy-consumption headless ferrite strip steel.
Background
The continuous casting and rolling device for the thin slab is one of main equipment for steel production and is of great importance in strip steel production. The prior thin slab is a cold-rolled product, and the rolling process comprises the following steps: hot rolling-pickling-cold rolling-annealing, in which there is a disadvantage of high amount of exhaust gas, and in addition, the use of an induction heating furnace during rolling, makes this type of thin slab costly and disadvantageous for long-term production of the thin slab.
In recent years, the heat and cold generation has become more and more accepted at home and abroad in terms of cost, environmental protection and the like. However, the development of "hot instead of cold" is limited due to the limitations in production specifications of the conventional hot rolling and thin slab continuous casting and rolling processes represented by CSP.
Although the existing thin plate endless continuous casting and rolling can produce thin strip steel, the production line is compact in structure, the casting blank is thin, the rolling process is influenced by the continuous casting pulling speed, the temperature thermal history is low, the strength is high, the thin plate endless continuous casting and rolling is difficult to replace a cold rolling product, and the induction heating furnace has high power consumption and great influence on the cost. Therefore, an optimized structural design and a production method are urgently needed to make up the existing defects in a standard way.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a rolling process for producing low-energy consumption headless ferritic steel strip, which fully utilizes the condition that the heat history of a sheet continuous casting and rolling production line is low, turns the disadvantage into the advantage, effectively improves the surface quality and the performance of the steel strip and enables the obtained steel strip to replace cold-rolled steel. The rolling process has the advantage of easy control, and the strip steel produced by the rolling process has surface quality capable of replacing non-electroplating and other medium and low-end cold-rolled products.
The technical scheme of the invention is as follows:
a rolling process for producing low-energy consumption endless ferritic steel strip mainly comprises the steps of continuous casting machine continuous rolling, rough rolling dephosphorization, two-frame rough rolling, pendulum shearing, pushing out of a stacker, finish rolling descaling, five-frame finish rolling, laminar cooling and coiling by an underground recoiling machine.
Preferably, the rolling process comprises the following specific steps:
(1) molten steel enters a crystallizer through ladle casting, and is crystallized through the crystallizer, and then is treated through a continuous casting machine at a pulling speed of more than or equal to 4.8m/min to obtain a casting blank I with the thickness of 120-130 mm;
(2) rough rolling descaling treatment is carried out on the casting blank I, surface iron scales and protective slag are cleaned, then rough rolling is carried out on the casting blank I through a two-frame, an intermediate blank I with the thickness of less than or equal to 20mm is obtained, and the temperature of the intermediate blank I is controlled to be more than or equal to 1020 ℃;
(3) after the intermediate billet I passes through the shearing head, the intermediate billet I is pushed out of a stacker roller way and then is subjected to finish rolling and descaling to obtain an intermediate billet II, wherein the temperature of the intermediate billet II is 930-950 ℃; the pressure of finish rolling and descaling is 150-300 bar; after the fine rolling dephosphorization treatment, iron scale on the surface of the intermediate billet I can be removed;
(4) the intermediate billet II is subjected to finish rolling treatment by five racks and rolled into 0.8-3.0mm strip steel;
(5) the strip steel is cooled to the temperature of 680-750 ℃ by laminar flow to obtain a recovered structure, and the recovered structure is rolled into a steel coil by an underground coiler.
Preferably, in the two-stand rough rolling process in the step (2), a two-stand high reduction rolling mill is used, and the rolling capacity of the high reduction rolling mill is 0-4500 t; because the more racks, the larger the temperature drop of the rolled piece is, the temperature drop can be effectively reduced by selecting a rolling mill with two racks under large pressure, and the enough rolling capacity can be ensured.
Preferably, in the step (3), in order to keep the intermediate billet I at a certain temperature when the intermediate billet I passes through the pushing stacker roller way, the length of the pushing stacker roller way is set to be 5-8 m; the temperature of the intermediate blank I is controlled, and subsequent treatment is facilitated.
Preferably, in the step (5), the length of laminar cooling is 8-15 m; after the strip steel is cooled by the laminar flow within the length range, a certain temperature can be maintained, and the performance of the strip steel is further ensured.
In the rolling process for producing the low-energy consumption headless ferritic strip steel, the ferritic strip steel comprises the following components in percentage by weight:
less than or equal to 0.05 percent of C, less than or equal to 0.20 percent of Si, less than or equal to 0.30 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.10 percent of Nb, Ti and V, and the balance of iron.
Preferably, the thickness of the ferritic steel strip produced by the rolling process is 0.8-3.0 mm; the ferrite strip steel can replace non-electroplating and other medium and low end cold rolling products.
Compared with the prior art, the invention has the beneficial effects that:
1. the method fully utilizes the existing equipment conditions (sheet continuous casting and rolling production line), and adopts the processes of two-frame rough rolling, push-out stacker, five-frame finish rolling, laminar cooling and the like to make the obtained strip steel be in a ferrite tissue form, so that the strip steel has the advantages of good surface quality and low strength, and is suitable for replacing non-electric low-end and medium-end cold-rolled products.
2. By controlling the thickness of the casting blank I and combining the arrangement of the two-rack rough rolling device, the temperature of the intermediate blank I can be effectively controlled, and the heat loss from the casting blank I to the intermediate blank II is reduced by combining the design of a push-out stacker roller way, so that an induction heating furnace is avoided in the strip steel rolling process, the equipment investment is reduced, the heat energy consumption is reduced, and the production cost is effectively reduced.
Drawings
FIG. 1 is a photograph comparing the product made from the steel strip of example 1 with the product made from cold rolling DC 01.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A ferritic steel strip comprises the following components in percentage by weight:
0.05% of C, 0.20% of Si, 0.30% of Mn, 0.030% of P, 0.015% of S, 0.10% of Nb + Ti + V and the balance of iron.
The rolling process of the ferrite strip steel comprises the following specific steps:
(1) molten steel enters a crystallizer through ladle casting, and is crystallized through the crystallizer, and then is treated through a continuous casting machine at a pulling speed of 4.8m/min to obtain a casting blank I with the thickness of 120 mm;
(2) rough rolling descaling treatment is carried out on the casting blank I, surface iron scales and protective slag are cleaned, then the casting blank I passes through a two-stand high-reduction rolling mill to obtain an intermediate blank I with the thickness of 20mm, and the temperature of the intermediate blank I is controlled to be 1020 ℃; the rolling capacity of a single large-reduction rolling mill is 4500t, and the reduction rate is 80%;
(3) after the intermediate billet I passes through the swinging shearing head, the intermediate billet I is pushed out of a stacker roller way and then is subjected to finish rolling and descaling to obtain an intermediate billet II, wherein the temperature of the intermediate billet II is 940 ℃; wherein the length of the push-out stacker roller way is 6 m; the pressure of finish rolling and descaling is 220 bar; after the fine rolling dephosphorization treatment, iron scale on the surface of the intermediate billet I can be removed;
(4) the intermediate billet II is subjected to finish rolling treatment by five frames and rolled into strip steel; the nominal thickness of the strip steel is 1.8 mm; the strip steel can replace non-electroplating and other middle and low end cold rolling products; the outlet temperature of the finishing mill is 780 ℃;
(5) and (3) carrying out laminar cooling on the strip steel to the temperature of 710 ℃ to obtain a recovered structure, wherein the length of the laminar cooling is 11m, and continuously rolling the strip steel into a steel coil by an underground coiler.
Example 2
A ferritic steel strip comprises the following components in percentage by weight:
0.04% of C, 0.10% of Si, 0.20% of Mn, 0.015% of P, 0.010% of S, 0.05% of Nb + Ti + V and the balance of iron.
The rolling process of the ferrite strip steel comprises the following specific steps:
(1) molten steel enters a crystallizer through ladle casting, and is crystallized through the crystallizer, and then is treated through a continuous casting machine at a pulling speed of 5.2m/min to obtain a casting blank I with the thickness of 125 mm;
(2) carrying out rough rolling descaling treatment on the casting blank I, cleaning surface iron scale and protective slag, then passing through a two-stand high-reduction rolling mill to obtain an intermediate blank I with the thickness of 8mm, and controlling the temperature of the intermediate blank I to be 1150 ℃; the rolling capacity of a single large-reduction rolling mill is 2000t, and the reduction rate is 85%;
(3) after the intermediate billet I passes through the swinging shearing head, the intermediate billet I is pushed out of a stacker roller way and then is subjected to finish rolling and descaling to obtain an intermediate billet II, wherein the temperature of the intermediate billet II is 930 ℃; wherein the length of the push-out stacker roller way is 5 m; the pressure of finish rolling and descaling is 150 bar; after the fine rolling dephosphorization treatment, iron scale on the surface of the intermediate billet I can be removed;
(4) the intermediate billet II is subjected to finish rolling treatment by five frames and rolled into strip steel; the nominal thickness of the strip steel is 0.8 mm; the strip steel can replace non-electroplating and other middle and low end cold rolling products; the outlet temperature of the finishing mill is 800 ℃;
(5) and (3) carrying out laminar cooling on the strip steel to the temperature of 680 ℃ to obtain a recovered structure, wherein the length of the laminar cooling is 11m, and continuously rolling the strip steel into a steel coil by an underground coiler.
Example 3
A ferritic steel strip comprises the following components in percentage by weight:
0.01% of C, 0.15% of Si, 0.10% of Mn, 0.010% of P, 0.007% of S, 0.01% of Nb + Ti + V and the balance of iron.
The rolling process of the ferrite strip steel comprises the following specific steps:
(1) molten steel enters a crystallizer through ladle casting, and is crystallized through the crystallizer, and then is treated through a continuous casting machine at a pulling speed of 5.5m/min to obtain a casting blank I with the thickness of 130 mm;
(2) rough rolling descaling treatment is carried out on the casting blank I, surface iron scales and protective slag are cleaned, then the casting blank I passes through a two-frame high-reduction rolling mill to obtain an intermediate blank I with the thickness of 8mm, and the temperature of the intermediate blank I is controlled to be 1300 ℃; the rolling capacity of a single large-reduction rolling mill is 3500t, and the reduction rate is 82%;
(3) after the intermediate billet I passes through the swinging shearing head, the intermediate billet I is pushed out of a stacker roller way and then is subjected to finish rolling and descaling to obtain an intermediate billet II, wherein the temperature of the intermediate billet II is 950 ℃; wherein the length of the push-out stacker roller way is 8 m; the pressure of finish rolling and descaling is 300 bar; after the fine rolling dephosphorization treatment, iron scale on the surface of the intermediate billet I can be removed;
(4) the intermediate billet II is subjected to finish rolling treatment by five frames and rolled into strip steel; the nominal thickness of the strip steel is 3.0 mm; the strip steel can replace non-electroplating and other middle and low end cold rolling products; the outlet temperature of the finishing mill is 810 ℃;
(5) and (3) carrying out laminar cooling on the strip steel to the temperature of 750 ℃ to obtain a recovered structure, wherein the length of the laminar cooling is 15m, and continuously rolling the strip steel into a steel coil by an underground coiler.
The properties and surface characteristics of the steel strips of examples 1-3 were examined and the results are shown in Table 1.
TABLE 1 strip Steel Performance test
Note:awhen the yield phenomenon is not obvious, the yield strength adopts Rp0.2；
bThe yield strength and the bending sample direction are longitudinal;
the cold rolled DC01 is a cold rolled steel strip commonly used in the market.
The surface characteristics of the steel strips of examples 1 to 3 were classified according to the following classification criteria:
general grade surface: code a, characteristics: the surface is allowed to have slight and local defects such as pits, concave surfaces, scratches and the like with the depth or height not more than half of the thickness tolerance of the steel strip, but the minimum thickness allowed by the steel strip is ensured;
higher level surface: code B, characteristic: the surface is allowed to have a small amount of slight hand feeling defects which do not influence the formability, the coating adhesion and the plating adhesion, such as slight scratch, indentation, pockmark, roll mark, oxidation color and the like.
In FIG. 1, the left drawing is the steel strip product of example 1 and the right drawing is the cold rolled DC01 steel strip product; as can be seen from the combination of FIG. 1, the surface of the product made of the steel strip provided by the embodiment 1 of the invention has no obvious difference with the surface of the product made of the cold-rolled DC01 steel strip. The product prepared by the strip steel in the embodiment 1 has smooth surface and smooth edges of the arranged through holes, which shows that the strip steel produced by the invention has low strength and can be suitable for various modeling designs, and the produced product can replace cold-rolled products.
Although the present invention has been described in detail by referring to the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A rolling process for producing low-energy consumption endless ferritic steel strips is characterized by mainly comprising the steps of continuous casting machine continuous rolling, rough rolling dephosphorization, two-frame rough rolling, pendulum shearing, pushing out of a stacker, finish rolling descaling, five-frame finish rolling, laminar cooling and coiling by an underground coiler.
2. The rolling process for producing the low-energy consumption headless ferritic steel strip according to claim 1, characterized in that the specific process is as follows:
(1) molten steel enters a crystallizer through ladle casting, and is crystallized through the crystallizer, and then is treated through a continuous casting machine at a pulling speed of more than or equal to 4.8m/min to obtain a casting blank I with the thickness of 120-130 mm;
(2) rough rolling descaling treatment is carried out on the casting blank I, surface iron scales and protective slag are cleaned, then rough rolling is carried out on the casting blank I through a two-frame, an intermediate blank I with the thickness of less than or equal to 20mm is obtained, and the temperature of the intermediate blank I is controlled to be more than or equal to 1020 ℃;
(3) after the intermediate billet I passes through the shearing head, the intermediate billet I is pushed out of a stacker roller way and then is subjected to finish rolling and descaling to obtain an intermediate billet II, wherein the temperature of the intermediate billet II is 930-950 ℃; the pressure of finish rolling and descaling is 150-300 bar;
(4) the intermediate billet II is subjected to finish rolling treatment by five racks and rolled into 0.8-3.0mm strip steel;
(5) the strip steel is cooled to the temperature of 680-750 ℃ by laminar flow to obtain a recovered structure, and the recovered structure is rolled into a steel coil by an underground coiler.
3. The rolling process for the production of low energy consumption headless ferritic steel strip according to claim 2, characterized in that during the two-stand roughing in step (2), a two-stand high reduction rolling mill is used, having a rolling capacity of 0 to 4500 t.
4. The rolling process for producing the low-energy consumption headless ferritic steel strip according to claim 2, characterized in that in step (3) the length of the push-out stacker roller table is set to 5-8 m.
5. The rolling process for the production of low energy consumption headless ferritic steel strip according to the claim 2, characterized in that, in step (5), the length of laminar cooling is comprised between 8 and 15 m.
6. The rolling process for the production of low energy headless ferritic steel strip according to claim 1, characterized in that it comprises the following components in percentage by weight:
less than or equal to 0.05 percent of C, less than or equal to 0.20 percent of Si, less than or equal to 0.30 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.10 percent of Nb, Ti and V, and the balance of iron.
7. Rolling process for the production of low-energy headless ferritic steel strip according to claim 6, characterised in that the thickness of the ferritic steel strip is comprised between 0.8 and 3.0 mm.
8. A rolling process for the production of a low energy consumption headless ferritic steel strip according to claim 6, characterized in that it comprises the following constituents in percentage by weight:
0.05% of C, 0.20% of Si, 0.30% of Mn, 0.030% of P, 0.015% of S, 0.10% of Nb + Ti + V and the balance of iron.
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| EP0937512A1 (en) * | 1998-02-19 | 1999-08-25 | Kvaerner Metals Continuous Casting Limited | Low cost apparatus and method for manufacture of light gauge steel strip |
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