CN117619904A - Control method for low-carbon low-silicon thin-specification strip steel oxidized iron sheet - Google Patents
Control method for low-carbon low-silicon thin-specification strip steel oxidized iron sheet Download PDFInfo
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- CN117619904A CN117619904A CN202311603791.2A CN202311603791A CN117619904A CN 117619904 A CN117619904 A CN 117619904A CN 202311603791 A CN202311603791 A CN 202311603791A CN 117619904 A CN117619904 A CN 117619904A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000010959 steel Substances 0.000 title claims abstract description 29
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 23
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 22
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 14
- 239000010703 silicon Substances 0.000 title claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 83
- 238000009749 continuous casting Methods 0.000 claims abstract description 22
- 229910000976 Electrical steel Inorganic materials 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 238000005507 spraying Methods 0.000 claims description 22
- 238000005266 casting Methods 0.000 claims description 16
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 238000003825 pressing Methods 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 15
- 230000001276 controlling effect Effects 0.000 description 7
- 238000005554 pickling Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 230000006872 improvement Effects 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000009847 ladle furnace Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Classifications
-
- 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
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a control method of low-carbon low-silicon thin-specification strip steel iron scales, which belongs to the field of steel production, wherein the thin specification is 0.6-1.2mm; the chemical components of the low-carbon low-silicon steel are as follows: c:0.005-0.06%, si:0.01-0.06%, mn:0.05-0.30%, S: less than or equal to 0.012 percent, P: less than or equal to 0.025 percent, als less than or equal to 0.050 percent, ti less than or equal to 0.008 percent, and the balance of Fe and unavoidable impurities; the process comprises the following steps: continuous casting, primary temperature control adjustment, rough rolling, secondary temperature control adjustment, IH furnace heating, single-pass descaling, tertiary temperature control adjustment, finish rolling, cooling and coiling to obtain the hot rolled material. The invention adopts multi-point temperature drop to control the rolling temperature of each rolling area and inhibit the generation of surface iron oxide scale so as to reduce the pressing in of the iron oxide scale.
Description
Technical Field
The invention discloses a split application of a low-carbon low-silicon strip production line scale control device and method (2021112784611), and relates to the field of steel production, in particular to a low-carbon low-silicon thin-specification strip steel scale control method.
Background
In recent years, the continuous casting and rolling production line has rapid technical progress and incomparable advantages in the aspect of rolling of thin specifications of plate and strip. The continuous casting and rolling production line has incomparable advantages in the aspects of energy conservation and consumption reduction, and in order to ensure the rolling stability of the rolling line with thin specification, reduce the heat loss of the rolling line and improve the energy utilization rate of a plate blank, the production line design requires no multipoint descaling of the rolling line, and only a single-pass descaling (the descaling pressure of 400 bar) is configured in front of a finishing mill group.
The low-carbon low-silicon steel is used as the main steel of the pickling plate, the deformation resistance of the strip steel is low, and oxidized iron sheets are easy to press in, so that the pickling plate is a great difficulty in the plate and strip rolling industry. Particularly for a short-flow production line, the continuous casting machine is rigidly connected with the roughing mill, the iron scale produced by the continuous casting machine is thin and high in adhesiveness, is directly pressed into the surface of a casting blank after being rolled by the roughing mill, and is more difficult to remove scales in a single pass before finish rolling. The surface quality of the finished product is restricted by severe iron scale pressing, the improvement rate is higher than that of the traditional production line, the acid washing disqualification rate reaches 5%, and the end user cannot use the product.
At present, a group of descaling is also added at the outlet of the continuous casting machine to solve the problem of poor control of iron scales, and even as in the Chinese patent invention (a control method for white spot defect on the surface of cold-rolled low-carbon steel) (CN 201910334459.8), multi-pass descaling is adopted: the method comprises the steps of pre-descaling, rough rolling descaling and finish rolling descaling, wherein the rough rolling descaling pass is more than or equal to 3 times, the water pressure of a descaling system is more than or equal to 190bar, and the descaling effect is ensured by carrying out multi-pass descaling on the oxide scale on the surface of the strip steel in the hot rolling process and fully descaling in a high-pressure environment. However, the increase of the descaling system firstly occupies investment, and secondly improves the temperature drop of the rolling line, and the loss of the temperature of the rolling line, particularly the reduction of the core temperature, is not beneficial to the stable rolling of thin specifications under the high pulling speed.
Disclosure of Invention
The technical task of the invention is to provide a method and equipment for controlling the iron scale of low-carbon low-silicon steel grade aiming at the short-process production line of endless rolled plate and strip and solve the problem of puzzling the pressing in of the iron scale.
The technical scheme for solving the technical problems is as follows: a control method for low-carbon low-silicon thin-specification strip steel oxidized iron sheet is characterized by comprising the following steps: the thin specification is 0.6-1.2mm; the chemical components of the low-carbon low-silicon steel are as follows: c:0.005-0.06%, si:0.01-0.06%, mn:0.05-0.30%, S: less than or equal to 0.012 percent, P: less than or equal to 0.025 percent, als less than or equal to 0.050 percent, ti less than or equal to 0.008 percent, and the balance of Fe and unavoidable impurities; the process comprises the following steps: continuous casting, primary temperature control adjustment, rough rolling, secondary temperature control adjustment, IH furnace heating, single-pass descaling, tertiary temperature control adjustment, finish rolling, cooling and coiling to obtain a hot rolled material; wherein:
the continuous casting is carried out to obtain a casting blank with the thickness of 70-110 mm;
the primary temperature control adjustment: the temperature of a casting blank entering a roughing mill is controlled to be 950-1000 ℃;
the rough rolling: the finishing temperature of the roughing mill is controlled to be 960-1000 ℃;
the secondary temperature control adjustment: the IH inlet temperature is controlled to be 880-930 ℃;
the IH furnace heats: IH is heated for 10+/-2 s, and the temperature is quickly heated from 850-920 ℃ at the inlet temperature of IH to 1060-1120 ℃ at the outlet temperature of IH;
the single-pass descaling: the pressure of the descaling system is 240-380bar;
the three temperature control adjustments: controlling the initial rolling temperature of the finish rolling to 960-1030 ℃;
the finish rolling: the finish rolling temperature is controlled to 780-860 ℃.
Further, the Si content is in the range of 0.03 to 0.06%.
Further, the primary temperature control is adjusted to be carried out temperature drop at the outlet of the continuous casting machine in a spraying mode.
Further, in the rough rolling described above: temperature drop is carried out between roughing mills R1/R2 and R2/R3.
Further, the secondary temperature control is adjusted to carry out multi-point temperature drop at the outlet of the roughing mill and the rotary drum shears.
Further, the three temperature control is adjusted to perform multi-point temperature drop at the inlet of the finishing mill.
Further, the finish rolling is five-frame finish rolling.
Further, in the finish rolling, a multi-point temperature drop is performed between F1/F2 and between F2/F3.
In the optimized scheme, the finish rolling temperature is controlled to be 820-860 ℃.
Compared with the prior art, the invention has the following outstanding beneficial effects:
1. the invention adopts multi-point temperature drop, controls the rolling temperature of each rolling area, and inhibits the generation of surface iron oxide scale so as to reduce the pressing-in of the iron oxide scale;
2. the new descaling system is not needed, the investment is reduced, and the problem of pressing in the iron scale of the short-process production line is solved with low cost;
3. by applying the technology of the invention, the acid washing improvement rate is reduced from about 5% to within 0.15%, and the economic benefit is obvious.
Drawings
Fig. 1 is a schematic view of a spray device of the present invention.
Fig. 2 is a right side view of fig. 1 of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description. Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
The thickness of the rolled finished product is 0.6-4.0mm. The process of the invention comprises the following steps: continuous casting, primary temperature control adjustment, rough rolling, secondary temperature control adjustment, IH furnace heating, single-pass descaling, tertiary temperature control adjustment, finish rolling, cooling and coiling to obtain the hot rolled material.
S1, continuous casting
The chemical components of the low-carbon low-silicon steel are as follows: c:0.005-0.06%, si:0.01-0.06%, mn:0.05-0.30%, S: less than or equal to 0.012 percent, P: less than or equal to 0.025 percent, als less than or equal to 0.050 percent, ti less than or equal to 0.008 percent, and the balance of Fe and unavoidable impurities.
In the optimization scheme, the Si range is 0.03-0.06%, the production stability and the product performance are not affected in the range, the bubbling mechanism of the iron scale can be restrained from the component angle, the pressing-in is avoided, and the method is suitable for a low-carbon low-silicon steel plate (0.6-1.2 mm) with thinner specification.
And continuously casting the qualified molten steel obtained by the ladle furnace to obtain a casting blank with the thickness of 70-110 mm.
S2, one-time temperature control adjustment
And (3) carrying out temperature drop at an outlet of the continuous casting machine in a spraying mode, and controlling the temperature of a casting blank entering a roughing mill to be 950-1000 ℃.
Specific hardware settings may be: a group of spraying devices are added at the outlet of the continuous casting machine, and the spraying devices are shown in figures 1-2 and comprise a collecting pipe 1, a plurality of water nozzles 2 and a manual ball valve 3. The water nozzle 2 is arranged on one side of the collecting pipe 1 facing the strip steel, and the water nozzle and the strip steel are connected in a waterway manner. The number of the water nozzles is 11-21, and the spraying pressure is 10-25bar. In the optimized scheme, the water nozzle divergence surface is 30 degrees. The height of the bottom surface of the casting blank and the water nozzle is not more than 220mm. The manual ball valve 3 is arranged at the water inlet end of the collecting pipe 1, and the water quantity of the collecting pipe 1 is controlled through the manual ball valve 3. In order to realize high temperature protection, the header 1 comprises a square outer tube and a stainless steel inner tube. In the optimization scheme, each group of spraying devices are arranged in two rows and are respectively positioned above and below the strip steel, and the water nozzles face the strip steel.
S3, rough rolling
And (3) carrying out temperature drop between the roughing mill R1/R2 and the roughing mill R2/R3, wherein the finishing temperature of the roughing mill is controlled to be 960-1000 ℃.
Specific hardware settings may be: and a group of spraying devices are respectively arranged between the roughing mill R1/R2 and the roughing mill R2/R3, each group of spraying devices is two, the two groups of spraying devices are respectively positioned above and below the strip steel, the number of water nozzles is 11-21, the spraying pressure is 10-25bar, an operator can set water quantity, the roughing mill outlet temperature hit is ensured, the rolling temperature rise and the casting blank core back temperature are mainly inhibited, and the roughing mill finishing temperature is controlled to 960-1000 ℃.
The spray device in the rough rolling area aims at controlling the rolling temperature of rolling mill entering each frame of rough rolling, and the outlet temperature of the rough rolling mill is not too high, so that the generation of hard iron sheet is restrained, the generation and the pressing-in amount of the iron sheet are reduced, and the pressing-in of the iron sheet generated in the continuous casting machine can be controlled.
S4, secondary temperature control adjustment
And (3) carrying out multi-point temperature drop at the outlet of the roughing mill and the rotary drum shears, and controlling the temperature of the IH inlet to 880-930 ℃.
Specific hardware settings may be: two rows of spraying devices are respectively added at the outlet of the roughing mill and the turning shears, each group of spraying devices is two, the two spraying devices are respectively positioned above and below the strip steel, the number of water nozzles is 11-21, the spraying pressure is 10-25bar, an operator can set water quantity, the temperature of an IH inlet is regulated in a small range, and the generation of iron scales between roughing and an IH furnace is mainly inhibited.
Because the casting blank core part of the continuous rolling continuous casting production line contains heat, the difference between the surface temperature of the casting blank and the core temperature is relatively large, the core temperature is high, and the casting blank is different from the traditional hot continuous rolling, and has the core temperature returning process, so that a spray device is added at an R3 outlet and a rotary drum shear to cool. Moreover, the water pressure is low (10-20 bar), and the descaling is not the conventional descaling (more than 100-250 bar). The invention aims to inhibit the generation of scale rather than using high pressure to remove scale.
S5, heating by IH furnace
The IH furnace heats to compensate for heat loss. IH is heated for 10+ -2 s, and the temperature is quickly heated from 850-920 ℃ at the inlet temperature of IH to 1060-1120 ℃ at the outlet temperature of IH.
S6, single-pass descaling
The pressure of the descaling system is 240-380bar, and the optimal scheme is 300-380bar.
S7, three-time temperature control adjustment
And (3) carrying out multi-point temperature drop at the inlet of the finishing mill, and controlling the initial rolling temperature of the finish rolling to 960-1030 ℃.
Specific hardware settings may be: the inlet of the finishing mill is provided with two rows of spraying devices, and the opening of the two rows of spraying devices is 60-100% when the finishing mill is used for normal production.
S8, finish rolling
Five frames finish rolling, multi-point temperature drop is carried out between F1/F2 and F2/F3, the finish rolling temperature is controlled to 780-860 ℃, and the optimal scheme is 820-860 ℃.
Specific hardware settings may be: two rows of spraying devices are arranged between the F1 and the F2, a row of spraying devices are arranged on the lower surface between the F2 and the F3, and the spraying pressure is 10-25bar. During normal production, two rows of spraying devices between F1 and F2 are opened by 10-50%, and one row of spraying devices on the lower surface between F2 and F3 is opened by 10-30%.
The inlet temperature is controlled to be lower than that of the traditional hot continuous rolling through each stage of finish rolling spray devices, and the temperature drop in the finish rolling process is small, so that the generation and the pressing-in amount of the iron oxide scale are reduced, and the pressing-in of the iron oxide scale generated by finish rolling can be controlled.
S9, cooling
S10, coiling to obtain a hot rolled material
Finally obtaining the hot rolled coil raw material with the thickness of 0.6-4.0mm.
To better compare the formulations of the present application with the prior art, a comparative test was performed.
Examples 1 to 4 and comparative examples 1 to 2 were prepared by the following process flow routes: steelmaking, continuous casting, rough rolling, finish rolling, laminar cooling, coiling, and pickling and leveling in the later period to obtain a final product.
Examples 1 to 4 adopt the multi-point spray device of the invention to carry out temperature drop; the descaling pressures in examples 1 to 4 were 340bar, 320bar, 380bar and 300bar, respectively, for a single descaling operation prior to finish rolling.
Comparative example 1 used single pass descaling prior to finish rolling at a descaling pressure of 400bar.
The comparative example 2 adopts multi-pass descaling, which comprises pre-descaling, rough rolling descaling and finish rolling descaling, and the descaling pressure is more than or equal to 200bar. The chemical compositions (in weight%) of examples 1-4 and comparative examples 1-2 are shown in the following table, with the balance being iron and unavoidable impurities.
| Project | C | Si | Mn | P | S | Alt | Ti |
| Example 1 | 0.058 | 0.054 | 0.28 | 0.012 | 0.007 | 0.025 | 0.0023 |
| Example 2 | 0.021 | 0.025 | 0.14 | 0.014 | 0.008 | 0.028 | 0.0022 |
| Example 3 | 0.035 | 0.059 | 0.05 | 0.009 | 0.010 | 0.035 | 0.0018 |
| Example 4 | 0.005 | 0.022 | 0.20 | 0.010 | 0.005 | 0.045 | 0.0035 |
| Comparative example 1 | 0.015 | 0.025 | 0.20 | 0.012 | 0.010 | 0.035 | 0.0015 |
| Comparative example 2 | 0.035 | 0.026 | 0.20 | 0.012 | 0.010 | 0.035 | 0.0019 |
Smelting by adopting a converter, an LF furnace and an RH furnace according to the requirements of material component design to obtain molten steel with required components; and (5) carrying out Ar protection continuous casting on the molten steel in the whole process to obtain the continuous casting slab with the thickness of 70-110 mm. And heating the casting blank, conveying the casting blank to a hot continuous rolling mill for rolling, controlling rolling by a rough rolling mill unit and a finish rolling mill unit, coiling the casting blank after laminar cooling, and cooling the laminar flow by adopting a front section to produce a hot rolled raw coil with the thickness of 0.6-4.0mm.
The main process control parameters for hot rolling are shown in the following table.
The low-carbon low-silicon steel is obtained by adopting the component systems and the process technology of examples 1-4, the surface of the finished product is good, the non-spindle-shaped, dispersed Hu Jiaoyan and the mountain-water picture-shaped iron oxide scale are pressed in, the surface of the finished product is poor, the spindle-shaped iron oxide scale is locally pressed in, and the mountain-water picture-shaped iron oxide scale is locally pressed in comparative example 1 and comparative example 2.
The proportion of the press-in defect of the scale in each example and the comparative example is shown in the table below.
| Project | Thickness specification (mm) | Scale press-in defect judging ratio (%) |
| Example 1 | 0.6 | 0.11％ |
| Example 2 | 1.5 | 0.08％ |
| Example 3 | 0.6 | 0.14％ |
| Example 4 | 1.5 | 0.09％ |
| Comparative example 1 | 1.5 | 3.56％ |
| Comparative example 2 | 1.5 | 0.09％ |
As shown by the data in the table, the low-carbon low-silicon steel plate obtained by the invention has good iron scale control capability, even under the condition of high drawing speed of 4.5-5.2m/min of the steel feeding and drawing speed of a rolling mill, the pickling improvement rate can be controlled within 0.15%, the requirements of users are met, the rolling with thin specification is stable, the section temperature difference is controlled within 30 ℃, and the center line deviation is within +/-8 mm.
Whereas the scale in comparative example 1 has serious pressing condition, the surface quality of the finished product is poor, and the pickling improvement rate is more than 3%.
In comparative example 2, the press-in condition of the iron scale is improved because of the presence of a plurality of pickling processes, and the pickling improvement rate is 0.09%. However, the investment is occupied, the energy consumption cost is increased by 12% compared with the energy consumption cost in the embodiments 1-4, the rolling line temperature is rapidly reduced, the loss of the rolling line temperature, especially the reduction of the core temperature, causes the instability of thin-specification rolling, the section temperature difference reaches about 50 ℃, and the deviation of the rolling center line is serious to +/-15 mm at high pulling speed. And the effect of the comparative example 2 is more in "descaling", namely, descaling is performed in a high-pressure environment by passing the scale on the surface of the strip steel for multiple times in the hot rolling process. The technology of the invention adopts multi-point temperature drop, controls the rolling temperature of each rolling area, and inhibits the generation of surface iron scales so as to reduce the pressing in of the iron scales, thus the technology of the invention has lower cost loss and obvious economic benefit.
It should be noted that, the specific embodiments of the present invention have been described in detail, and no mention is made of the related art which partially uses the existing continuous casting and rolling line of sheet billet. Various obvious modifications thereof will be apparent to those skilled in the art without departing from the spirit and scope of the invention.
Claims (8)
1. A control method for low-carbon low-silicon thin-specification strip steel oxidized iron sheet is characterized by comprising the following steps: the thin specification is 0.6-1.2mm; the chemical components of the low-carbon low-silicon steel are as follows: c:0.005-0.06%, si:0.01-0.06%, mn:0.05-0.30%, S: less than or equal to 0.012 percent, P: less than or equal to 0.025 percent, als less than or equal to 0.050 percent, ti less than or equal to 0.008 percent, and the balance of Fe and unavoidable impurities; the process comprises the following steps: continuous casting, primary temperature control adjustment, rough rolling, secondary temperature control adjustment, IH furnace heating, single-pass descaling, tertiary temperature control adjustment, finish rolling, cooling and coiling to obtain a hot rolled material; wherein:
the continuous casting is carried out to obtain a casting blank with the thickness of 70-110 mm;
the primary temperature control adjustment: the temperature of a casting blank entering a roughing mill is controlled to be 950-1000 ℃;
the rough rolling: the finishing temperature of the roughing mill is controlled to be 960-1000 ℃;
the secondary temperature control adjustment: the IH inlet temperature is controlled to be 880-930 ℃;
the IH furnace heats: IH is heated for 10+/-2 s, and the temperature is quickly heated from 850-920 ℃ at the inlet temperature of IH to 1060-1120 ℃ at the outlet temperature of IH;
the single-pass descaling: the pressure of the descaling system is 240-380bar;
the three temperature control adjustments: controlling the initial rolling temperature of the finish rolling to 960-1030 ℃;
the finish rolling: the finish rolling temperature is controlled to 780-860 ℃.
2. The control method of the low-carbon low-silicon thin-specification strip steel scale according to claim 1, which is characterized in that: the Si is in the range of 0.03-0.06%.
3. The control method of the low-carbon low-silicon thin-specification strip steel scale according to claim 1, which is characterized in that: the primary temperature control is adjusted to be temperature-reduced at the outlet of the continuous casting machine in a spraying mode.
4. The control method of the low-carbon low-silicon thin-specification strip steel scale according to claim 1, which is characterized in that: in the rough rolling: temperature drop is carried out between roughing mills R1/R2 and R2/R3.
5. The control method of the low-carbon low-silicon thin-specification strip steel scale according to claim 1, which is characterized in that: the secondary temperature control is adjusted to carry out multi-point temperature drop at the outlet of the roughing mill and the rotary drum shears.
6. The control method of the low-carbon low-silicon thin-specification strip steel scale according to claim 1, which is characterized in that: the three times of temperature control are adjusted to carry out multi-point temperature drop at the inlet of the finishing mill.
7. The control method of the low-carbon low-silicon thin-specification strip steel scale according to claim 1, which is characterized in that: and the finish rolling is five-frame finish rolling.
8. The control method of the low-carbon low-silicon thin-specification strip steel scale according to claim 1, which is characterized in that: in the finish rolling, multi-point temperature drop is performed between F1/F2 and between F2/F3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311603791.2A CN117619904A (en) | 2021-10-30 | 2021-10-30 | Control method for low-carbon low-silicon thin-specification strip steel oxidized iron sheet |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311603791.2A CN117619904A (en) | 2021-10-30 | 2021-10-30 | Control method for low-carbon low-silicon thin-specification strip steel oxidized iron sheet |
| CN202111278461.1A CN113996656B (en) | 2021-10-30 | 2021-10-30 | Oxidized iron scale control device and method for low-carbon low-silicon plate and strip production line |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111278461.1A Division CN113996656B (en) | 2021-10-30 | 2021-10-30 | Oxidized iron scale control device and method for low-carbon low-silicon plate and strip production line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
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| JP2005296973A (en) * | 2004-04-07 | 2005-10-27 | Sumitomo Metal Ind Ltd | Method and apparatus for manufacturing hot-rolled steel plate |
| JP2009095852A (en) * | 2007-10-16 | 2009-05-07 | Sumitomo Metal Ind Ltd | Method and apparatus for manufacturing hot-rolled steel sheet |
| CN101856669B (en) * | 2010-06-02 | 2012-01-04 | 东北大学 | Control method of softness of oxide scales on surface of hot-rolling strip steel |
| CN102615114A (en) * | 2012-03-30 | 2012-08-01 | 南京钢铁股份有限公司 | Method for temperature-controlling and rolling ribbon steel for chain manufacture |
| CN103658178B (en) * | 2012-08-31 | 2015-07-22 | 宝山钢铁股份有限公司 | Method for producing high-strength thin strip steel in short process |
| CN103212571B (en) * | 2013-04-18 | 2015-06-10 | 湖南华菱湘潭钢铁有限公司 | Method for producing oxide scale capable of preventing steel plate surface from getting rusty |
| JP6152839B2 (en) * | 2014-10-09 | 2017-06-28 | Ｊｆｅスチール株式会社 | Manufacturing equipment and manufacturing method for hot-rolled steel sheet |
| CN106583453B (en) * | 2016-12-27 | 2018-04-17 | 中冶南方工程技术有限公司 | A kind of method that ultra-thin mild steel is produced using continuous casting and rolling technique of sheet bar |
| CN107252821B (en) * | 2017-05-15 | 2018-10-09 | 河钢股份有限公司邯郸分公司 | A kind of hot-rolled structural steel production method that can avoid generating the black steel defect of pickling |
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