CN111266406A - Rolling method of ultrathin hot continuous rolling steel strip - Google Patents
Rolling method of ultrathin hot continuous rolling steel strip Download PDFInfo
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- CN111266406A CN111266406A CN202010135303.XA CN202010135303A CN111266406A CN 111266406 A CN111266406 A CN 111266406A CN 202010135303 A CN202010135303 A CN 202010135303A CN 111266406 A CN111266406 A CN 111266406A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 123
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 71
- 239000010959 steel Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000498 cooling water Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 230000007547 defect Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 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
- B21B1/22—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
- B21B1/26—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 by hot-rolling, e.g. Steckel hot mill
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
Abstract
The invention belongs to the technical field of hot continuous rolling steel strip production, and particularly relates to a rolling method of an extremely thin hot continuous rolling steel strip. The invention aims to provide a rolling method of an extremely thin hot continuous rolling steel strip, which can improve the surface quality and the yield of the steel strip. The method comprises the following steps: heating the steel billet, and then sequentially carrying out 6-pass rough rolling, coiling by a hot coil box, finish rolling, laminar cooling and coiling to obtain the ultrathin hot continuous rolling steel strip; the finish rolling is carried out by 7 passes, and the rolling speed of the 1 st pass is more than or equal to 10 m/s; the rolling speed of the 7 th pass is less than or equal to 15.5 m/s; the initial rolling temperature of the finish rolling is 1080-1150 ℃; the finishing temperature is 860 to 920 ℃. The rolling method has high stability, the obtained hot continuous rolling steel strip has good surface quality, and the yield can reach more than 95%.
Description
Technical Field
The invention belongs to the technical field of hot continuous rolling steel strip production, and particularly relates to a rolling method of an extremely thin hot continuous rolling steel strip.
Background
In recent years, with the rapid development of the automobile industry and the improvement of the living standard of people, the automobile holding capacity is increased sharply, the dependence on energy is higher and higher, and energy conservation and environmental protection become two problems facing the current development of the automobile industry all over the world. Research shows that the weight of the automobile can be reduced to effectively reduce oil consumption and emission, the weight of the whole automobile is reduced by 10%, the oil consumption is reduced by 6% -8%, the emission is reduced by 4% -10%, the light weight is an important development direction of the automobile industry, and the application of the new material is considered as the key for realizing the weight reduction of the automobile.
The acid-washed ultrathin hot continuous rolling steel strip for the automobile structure is used as an ideal substitute product for a part of cold-rolled products, has the advantages of short production flow, reduced energy consumption, reduced carbon emission and reduced product finished products, and particularly has a development trend of replacing thick cold-rolled plates with acid-washed plates with high surface quality and high formability in the international market in recent years. However, the development and production of extremely thin gauge hot continuous rolled steel strip exists such as: the tail part of the steel strip is rolled to be broken, the surface oxidized iron sheet is pressed in, pits, holes, cavities, waves, even waste is rolled and the like.
Disclosure of Invention
The invention aims to provide a rolling method of an extremely thin hot continuous rolling steel strip, which can improve the surface quality and the yield of the steel strip.
The technical scheme adopted by the invention for solving the technical problems is to provide a rolling method of an extremely thin hot continuous rolling steel strip. The method comprises the following steps: heating the steel billet, and then sequentially carrying out 6-pass rough rolling, coiling by a hot coil box, finish rolling, laminar cooling and coiling to obtain the ultrathin hot continuous rolling steel strip; the finish rolling is carried out by 7 passes, and the rolling speed of the 1 st pass is more than or equal to 10 m/s; the rolling speed of the 7 th pass is less than or equal to 15.5 m/s; the initial rolling temperature of the finish rolling is 1080-1150 ℃; the finishing temperature is 860 to 920 ℃.
Further, the steel billet comprises the following chemical components in percentage by weight: less than or equal to 0.12 percent of C, less than or equal to 0.50 percent of Si, less than or equal to 1.5 percent of Mn, less than or equal to 0.80 percent of Cr, less than or equal to 0.06 percent of Ti, more than or equal to 0.010 percent of Als, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, and the balance of Fe and inevitable impurities.
Further, the length of the steel billet is less than or equal to 9.5 m; the heating temperature of the steel billet is 1240-1280 ℃.
Further, high-pressure descaling is carried out on odd passes of the rough rolling procedure, and the water pressure of descaling water is more than or equal to 20 MPa.
Further, obtaining an intermediate blank of 34-38 mm after rough rolling.
Further, after the rough rolling process, the steel billet is subjected to high-pressure descaling and then enters a hot coil box to be coiled; the water pressure of the descaling water is more than or equal to 20 MPa.
Furthermore, the finish rolling is carried out by adopting seven hot continuous rolling units, and the tension and the sleeve quantity value of each loop between the racks of the hot continuous rolling units meet the following requirements: the tension of the loop L1 is 6.0-7.0 MPa, and the loop amount is 9.0-10.0 mm; the tension of the loop L2 is 9.0-10.0 MPa, and the loop amount is 14.0-15.0 mm; the tension of the loop L3 is 11.0-12.0 MPa, and the loop amount is 12.0-13.0 mm; the tension of the loop L4 is 13.0-14.0 MPa, and the loop amount is 11.0-12.0 mm; the tension of the loop L5 is 14.0-15.0 MPa, and the loop amount is 8.0-9.0 mm; the tension of the loop L6 is 15.5-17.0 MPa, and the loop amount is 7.0-8.0 mm; the sleeve-pulling angle of the loop is 15-25 degrees.
Further, the service cycle of the roller of the finishing mill group is 20 km-50 km.
Further, the thickness of the ultrathin hot continuous rolling steel strip is 1.0-1.8 mm.
Further, the laminar cooling adopts a sparse cooling mode, and the opening ratios of the upper header and the lower header of the cooling water are respectively 20% -50% and 50% -80%.
Further, the coiling temperature is 540-660 ℃.
The invention has the beneficial effects that:
according to the invention, by adopting a rolling mode of 6-pass rough rolling and 7-pass finish rolling and matching with the heating process of the billet, the obtained hot continuous rolling steel strip has the advantage of high surface quality, and the defects of rolled steel strip tail, pressed surface oxidized iron sheet, pits, holes, waves, rolling waste and the like in the steel strip preparation process in the prior art are avoided. The rolling method has high stability, and can improve the yield of the hot continuous rolling steel strip with the extremely thin specification, wherein the yield can reach more than 95%. The surface of the ultrathin hot continuous rolling steel strip obtained by the method has no transverse folding defect, and the surface roughness Ra is below 1.5 mu m.
Detailed Description
The invention aims to solve the problems in the production process of the ultrathin hot continuous rolling steel strip, such as: the rolling method has the advantages that problems of rolled tail portions of the steel strips, pressed surface oxidized iron sheets, pits, holes, cavities, wave shapes, even waste rolling and the like are solved, rolling stability of the extremely-thin hot continuous rolled steel strips is achieved, surface quality and yield are improved, and the rolling method of the extremely-thin hot continuous rolled steel strips is provided.
Specifically, the rolling method of the hot continuous rolling steel strip with the extremely thin specification comprises the following steps: heating a steel billet at 1240-1280 ℃, and then sequentially carrying out 6-pass rough rolling, wherein high-pressure descaling is carried out on odd-numbered passes of the rough rolling procedure, after the rough rolling is finished, the steel billet enters a coil box to be coiled, and then enters a finish rolling procedure, the finish rolling is carried out for 7 passes, the rolling process adopts accelerated rolling, the rolling speed of the 1 st pass is more than or equal to 10m/s, the rolling speed of the 7 th pass is less than or equal to 15.5m/s, the start rolling temperature of the finish rolling is 1080-1150 ℃, and the finish rolling temperature is 860-920 ℃. The finish rolling is carried out by adopting seven hot continuous rolling units, and the tension and the sleeve quantity value of each loop between the hot continuous rolling machine frames meet the following requirements: the tension of the loop L1 is 6.0-7.0 MPa, and the loop amount is 9.0-10.0 mm; the tension of the loop L2 is 9.0-10.0 MPa, and the loop amount is 14.0-15.0 mm; the tension of the loop L3 is 11.0-12.0 MPa, and the loop amount is 12.0-13.0 mm; the tension of the loop L4 is 13.0-14.0 MPa, and the loop amount is 11.0-12.0 mm; the tension of the loop L5 is 14.0-15.0 MPa, and the loop amount is 8.0-9.0 mm; the tension of the loop L6 is 15.5-17.0 MPa, and the loop amount is 7.0-8.0 mm; the sleeve rising angle of the loop is 15-25 degrees, laminar cooling is carried out after finish rolling, and the material is obtained after coiling.
The process parameters are adopted during finish rolling, so that the strip steel can be prevented from being scraped and hung with the outlet guide plate, and meanwhile, after the tension between the frames is increased, the strip steel is stretched more fully between the frames, the strip steel is not easy to deviate, and the rolling stability of the strip steel with an extremely thin specification is improved. The service life of the roller of the finishing mill group is 20 km-50 km.
All stand cooling water and descaling water were shut off during the finish rolling of the invention. The finish rolling transition thickness is 2.0mm → 1.8mm → 1.65mm → 1.5mm → 1.4mm → 1.3mm → 1.2mm → 1.1mm → 1.0mm in this order. Namely: when the hot continuous rolling steel strip with the thickness of 1.0mm is rolled, the hot continuous rolling steel strip with the thickness of other than 2.0mm can be selected to be sequentially rolled according to the transition thickness; when the hot continuous rolling steel strip with the thickness of 1.4mm is rolled, the hot continuous rolling steel strips with the thicknesses of 2.0mm, 1.8mm, 1.65mm and 1.5mm can be selected to be rolled according to the transition thicknesses. The rolling method can reduce the working procedures, save the energy consumption and greatly reduce the cost.
By adopting the rolling mode of rough rolling and finish rolling and matching with a proper billet heating process, the obtained hot continuous rolling steel strip has the advantages of high surface quality, no transverse folding defect on the surface and surface roughness Ra below 1.5 mu m. In addition, the rolling method has high stability, and can improve the yield of the hot continuous rolling steel strip with the extremely thin specification, wherein the yield can reach more than 95%.
The present invention will be further illustrated by the following specific examples. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Examples and comparative examples
The steel blanks in the examples and comparative examples were composed of the following chemical components in the following weight percentages, as shown in table 1.
TABLE 1 chemical composition of steel billet in examples and comparative examples
| C | Si | Mn | P | S | Cr | Ti | Als | |
| Example 1 | 0.11 | 0.22 | 1.43 | 0.012 | 0.007 | 0.36 | 0.055 | 0.022 |
| Example 2 | 0.07 | 0.41 | 1.05 | 0.008 | 0.005 | 0.30 | 0.043 | 0.034 |
| Example 3 | 0.003 | 0.22 | 0.65 | 0.006 | 0.001 | 0.21 | 0.015 | 0.056 |
| Example 4 | 0.03 | 0.22 | 1.26 | 0.010 | 0.008 | 0.44 | 0.025 | 0.058 |
| Comparative example 1 | 0.05 | 0.05 | 0.45 | 0.012 | 0.003 | 0.25 | 0.020 | 0.028 |
The parameters of the thickness, the length, the tapping temperature, the heating time, the rough rolling mode, the thickness of the intermediate billet, whether to coil the box and the like of the steel billet are detailed in a table 2.
TABLE 2 rough Rolling Process parameters of examples and comparative examples
The execution conditions of the items such as the rolling mode, the rolling speed of F1, the maximum rolling speed of F7, the finishing temperature, the descaling of the steel strip, the cooling water between the stands and the like are detailed in Table 3.
TABLE 3 finish Rolling Process parameters of examples and comparative examples
The tension and the loop quantity value of the loop L1-L6 between F1-F7 meet the requirements of the table 4, and the loop rising angle is 15-25 degrees.
TABLE 4 example and comparative example hot continuous rolling mill loop tension and loop magnitude parameters
In the laminar cooling stage, a sparse cooling mode is adopted, and the opening ratio and the coiling temperature of the upper header and the lower header of the cooling water are detailed in table 5.
TABLE 5 laminar cooling and coiling parameters for examples and comparative examples
The ultrathin hot continuous rolling steel strip obtained by the method has good surface quality, no transverse folding defect on the surface of the steel strip, the surface roughness Ra of the steel strip is below 1.5 mu m, and the yield of the hot continuous rolling steel strip can reach more than 95 percent. The tail of the steel strip obtained in the comparative example 1 is rolled to be broken, the surface has serious transverse folding defects, the surface roughness Ra is more than 2.0 mu m, and the yield is less than 60 percent.
Claims (10)
1. The rolling method of the ultrathin hot continuous rolling steel strip is characterized by comprising the following steps: the method comprises the following steps: heating the steel billet, and then sequentially carrying out 6-pass rough rolling, coiling by a hot coil box, finish rolling, laminar cooling and coiling to obtain the ultrathin hot continuous rolling steel strip; the finish rolling is carried out by 7 passes, and the rolling speed of the 1 st pass is more than or equal to 10 m/s; the rolling speed of the 7 th pass is less than or equal to 15.5 m/s; the initial rolling temperature of the finish rolling is 1080-1150 ℃; the finishing temperature is 860 to 920 ℃.
2. The method of rolling an extremely thin hot continuous rolled steel strip according to claim 1, characterized in that: the steel billet comprises the following chemical components in percentage by weight: less than or equal to 0.12 percent of C, less than or equal to 0.50 percent of Si, less than or equal to 1.5 percent of Mn, less than or equal to 0.80 percent of Cr, less than or equal to 0.06 percent of Ti, more than or equal to 0.010 percent of Als, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, and the balance of Fe and inevitable impurities.
3. The rolling method of an extremely thin hot continuous rolled steel strip according to claim 1 or 2, characterized in that: the length of the steel billet is less than or equal to 9.5 m; the heating temperature of the steel billet is 1240-1280 ℃.
4. The method for rolling an extremely thin hot continuous rolled steel strip according to any one of claims 1 to 3, characterized in that: and carrying out high-pressure descaling in odd times of the rough rolling procedure, wherein the water pressure of descaling water is more than or equal to 20 MPa.
5. The method for rolling an extremely thin hot continuous rolled steel strip according to any one of claims 1 to 4, characterized in that: and obtaining an intermediate blank with the thickness of 34-38 mm after rough rolling.
6. The method for rolling an extremely thin hot continuous rolled steel strip according to any one of claims 1 to 5, characterized in that: after the rough rolling process, the billet is subjected to high-pressure descaling and then enters a hot coil box to be coiled; the water pressure of the descaling water is more than or equal to 20 MPa.
7. The method for rolling an extremely thin hot continuous rolled steel strip according to any one of claims 1 to 6, characterized in that: the finish rolling is carried out by adopting seven hot continuous rolling mill units, and the tension and the sleeve quantity value of each loop between the hot continuous rolling mill frames meet the following requirements: the tension of the loop L1 is 6.0-7.0 MPa, and the loop amount is 9.0-10.0 mm; the tension of the loop L2 is 9.0-10.0 MPa, and the loop amount is 14.0-15.0 mm; the tension of the loop L3 is 11.0-12.0 MPa, and the loop amount is 12.0-13.0 mm; the tension of the loop L4 is 13.0-14.0 MPa, and the loop amount is 11.012.0 mm; the tension of the loop L5 is 14.0-15.0 MPa, and the loop amount is 8.0-9.0 mm; the tension of the loop L6 is 15.5-17.0 MPa, and the loop amount is 7.0-8.0 mm; the sleeve-pulling angle of the loop is 15-25 degrees.
8. The method for rolling an extremely thin hot continuous rolled steel strip according to any one of claims 1 to 7, characterized in that: the thickness of the extremely thin hot continuous rolling steel strip is 1.0-1.8 mm.
9. The method for rolling an extremely thin hot continuous rolled steel strip according to any one of claims 1 to 8, characterized in that: the laminar cooling adopts a sparse cooling mode, and the opening proportion of the upper header and the lower header of the cooling water is 20-50% and 50-80% respectively.
10. The method for rolling an extremely thin hot continuous rolled steel strip according to any one of claims 1 to 9, characterized in that: the coiling temperature is 540-660 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112692056A (en) * | 2020-12-30 | 2021-04-23 | 唐山燕山钢铁有限公司 | Production process of ultrathin hot-rolled checkered plate with thickness of less than 1mm |
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