CN109097700B - Low-carbon steel plate easy to pickle in CSP process and manufacturing method thereof - Google Patents
Low-carbon steel plate easy to pickle in CSP process and manufacturing method thereof Download PDFInfo
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- CN109097700B CN109097700B CN201811122283.1A CN201811122283A CN109097700B CN 109097700 B CN109097700 B CN 109097700B CN 201811122283 A CN201811122283 A CN 201811122283A CN 109097700 B CN109097700 B CN 109097700B
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a low-carbon steel plate easy to acid wash in a CSP process and a manufacturing method thereof. The chemical components and weight percentage are as follows: c: 0.020-0.050%; si: less than or equal to 0.030 percent; mn: less than or equal to 0.30 percent; p: less than or equal to 0.015 percent; s: less than or equal to 0.010 percent; al: 0.020-0.060%; the balance of Fe and inevitable impurities. The method comprises the following steps: the method comprises the following steps of molten iron pretreatment, converter smelting, argon blowing station, LF furnace refining, CSP continuous casting, heating, high-pressure water descaling, hot rolling, laminar cooling, and reasonable smelting, heating, hot rolling, cooling and coiling of the steel plate. According to the method disclosed by the invention, the thickness of the iron scale of the low-carbon steel plate can be obviously reduced, the proportion of FeO in the iron scale is improved, the acid liquor consumption in the subsequent acid pickling process is reduced, the acid pickling time is reduced, and the production efficiency and the yield of the steel plate are improved.
Description
Technical Field
The invention relates to the technical field of production processes of sheet billet continuous casting and rolling steel, in particular to a low-carbon steel plate easy to acid wash in a CSP process and a manufacturing method thereof.
Background
The low-carbon steel is used as one of important varieties in CSP product structures, is mainly used as a cold rolling base material, and is subjected to an acid cleaning process to remove surface iron oxide scales. The surface scale of the hot-rolled strip steel generally consists of the outermost layer Fe2O3Middle layer Fe3O4And innermost FeO, wherein Fe2O3Most dense, Fe3O4The next generationFeO is the most loose; FeO is most susceptible to reductive decomposition by acid, Fe3O4Second, Fe2O3Most difficult to be reduced and decomposed by acid. The thinner the thickness of the iron scale, the more the proportion of FeO in the iron scale structure, and the more beneficial to the improvement of the pickling efficiency and the pickling surface quality.
With the rapid development of industries such as automobiles, household appliances and the like, downstream users have higher and higher requirements on the performance of steel and the surface quality of the steel. At present, the surface quality of a cold-rolled base material is generally improved by controlling a pickling process in domestic steel enterprises, and due to long-term systematic research on the surface quality of low-carbon steel in a CSP process in China, the thicknesses and the structures of iron scales at different positions of a hot-rolled coil are often inconsistent, the iron scales with different thicknesses and structures can directly influence the surface quality and the pickling efficiency of a pickled product, so that the surface quality of a final pickled plate can often generate the phenomenon of 'underpickling' or 'over-pickling'. When the acid pickling is performed, the iron scale on the surface of the steel plate is not completely pickled, so that the subsequent product quality is inevitably influenced; when the 'over-pickling' occurs, although the iron oxide scales of the steel are pickled completely, the consumption of the acid liquor is increased or the pickling time is prolonged, so that the ecological environment is inevitably polluted greatly, the energy conservation and the environmental protection are not facilitated, the production cost is increased, and the quality grade of the subsequent cold-rolled product is seriously hindered from being improved.
At present, the method for reducing the thickness of the scale of hot rolled strip steel and improving the pickling efficiency mainly focuses on the traditional hot continuous rolling process; on the other hand, the research on the continuous casting and rolling process of the sheet billet is relatively less, the requirements on the dephosphorization water pressure and the cooling equipment capacity are higher, and the investment of newly-added equipment is needed. The methods are not suitable or increase the production cost, and a method for reducing the scale of the low-carbon steel in the CSP process and improving the pickling efficiency on the premise of not increasing the production cost is not available at present.
Disclosure of Invention
The invention aims to provide a low-carbon steel plate easy to pickle in a CSP process and a manufacturing method thereof. The steel plate can obviously reduce the thickness of the iron scale of the low-carbon steel plate, improve the proportion of FeO in the iron scale, reduce the acid liquor dosage of the subsequent acid washing process, reduce the acid washing time and improve the production efficiency and the yield through reasonable smelting, heating, hot rolling, cooling and coiling processes. The low-carbon steel plate is mainly used as a cold-rolled base material for pickling, continuous annealing and cover annealing processes.
The technical scheme adopted by the invention is as follows:
the easy-pickling low-carbon steel plate for the CSP process is characterized by comprising the following chemical components in percentage by weight: c: 0.020-0.050%; si: less than or equal to 0.030 percent; mn: less than or equal to 0.30 percent; p: less than or equal to 0.015 percent; s: less than or equal to 0.010 percent; al: 0.020-0.060%; the balance of Fe and inevitable impurities.
Further, the chemical components and weight percentages are preferably as follows: c: 0.024-0.048%; si: 0.02-0.025%; mn: 0.08-0.12%; p: less than or equal to 0.013 percent; s: less than or equal to 0.004 percent; al: 0.024-0.057%; the balance of Fe and inevitable impurities.
The invention also provides a manufacturing method of the low-carbon steel plate easy to pickle in the CSP process, which comprises the following steps: the method comprises the following steps of molten iron pretreatment, converter smelting, argon blowing station, LF furnace refining, CSP continuous casting, heating, high-pressure water descaling, hot rolling, laminar cooling and reeling.
In the heating step, the casting blank enters a roller hearth type heating furnace and is heated at a low temperature, the discharging temperature of the casting blank is controlled to be 1000-1100 ℃, and the air excess coefficient of each area in the heating furnace is controlled to be 1.05-1.30.
And in the high-pressure water descaling step, controlling the pressure of the descaling water to be not lower than 20 MPa.
In the hot rolling step, a 7-stand finishing mill is adopted for rolling, and low-temperature initial rolling and low-temperature final rolling processes are adopted, wherein the initial rolling temperature is 960-1000 ℃, the final rolling temperature is controlled at 760-800 ℃, secondary descaling water behind F1 stands and F2 stands is opened, cooling water between stands is opened, and the rolling speed is not lower than 4.0 m/s.
In the laminar cooling step, the cooling speed is 20-40 ℃/s.
The coiling temperature is 600-680 ℃.
Further, air cooling to room temperature is further included after the coiling step.
The invention mainly adopts the following components in the component design, namely low C, low Si, low P, low S and C: the main reason for 0.020-0.050% is to prevent a large amount of carbide from precipitating, so that the strength of the strip steel is increased and the forming performance is deteriorated. Si is less than or equal to 0.030 percent, so that the solid solution strengthening effect of Si is reduced, and the strength of the strip steel is reduced; on the other hand, in order to prevent the Si content from being too high, fayalite (2FeO. SiO) is produced by a bonding reaction with FeO at a high temperature2) FeO is firmly nailed and rolled on the surface of the steel matrix with the strip, so that the difficulty in removing the scale is increased; the Mn content is less than or equal to 0.30 percent, and is mainly used for fixing S and preventing the over-high strength of the strip steel; p, S as an impurity element adversely affects the formability of the steel strip, and the lower the content, the better the formability should be controlled. The content of Al is 0.020-0.060%, Al is mainly used as a deoxidizer to reduce the oxygen content in steel, and on one hand, the thickness of iron scale is favorably controlled; on the other hand, the AlN precipitation strength effect is controlled, and the high strength of the strip steel is prevented.
In the heating step, low-temperature heating is adopted, and the heating temperature is controlled to be 1000-1100 ℃, so that on one hand, the furnace-generated oxide scale is thicker in order to avoid overhigh temperature; on the other hand, the phenomenon that the heating temperature is too high to generate molten fayalite is prevented, the fayalite in the molten state can be solidified along with the reduction of the temperature, FeO is firmly nailed and rolled on a steel matrix, and the difficulty in removing the scale is increased. In the hot rolling process, a low-temperature start rolling process, a low-temperature finish rolling process and a high-speed rolling process with the rolling speed not lower than 4.0m/s are adopted, and a reasonable coiling process is matched. The final rolling temperature is controlled to be 760-800 ℃, the main purpose of the method is to control the thickness of the iron scale generated in the rolling process, the thickness of the iron scale in the hot rolled strip steel rolling process mainly depends on the rolling temperature and the rolling speed, the lower the rolling temperature is, the faster the rolling speed is, the slower the growth speed of the iron scale of the strip steel is, and the smaller the thickness of the iron scale is. The coiling temperature is controlled to be 600-680 ℃, mainly aiming at improving the FeO proportion in the iron scale, the FeO structure is loose and porous, easy to corrode and poor in adhesion with a strip steel matrix, and Fe3O4Compact structure, corrosion resistance, good adhesion with the strip steel substrate, high FeO proportion and Fe3O4The smaller the ratio, the more susceptible the strip steel is to pickling.
The average thickness of the iron scale of the 3.5m low-carbon steel plate produced by the method is 5.348 mu m, the FeO proportion is about 15-20%, and Fe3O4The proportion is about 80-85%, the average thickness of the scale of the low-carbon steel plate with the same specification produced by the CSP conventional process is 8.287 mu m, and Fe3O4The proportion reaches more than 95 percent. Compared with the CSP conventional process, the thickness of the scale of the low-carbon steel plate produced by the method is reduced by more than 35%, the proportion of FeO is increased by 15-20%, the yield of the low-carbon steel plate can be improved, the acid liquor consumption and time of the subsequent pickling process are reduced, and the pickling efficiency is improved.
Drawings
FIG. 1 shows the thickness and morphology of the hot rolled low carbon steel scale head of example 1;
FIG. 2 shows the thickness and morphology of the tail of the low carbon steel scale hot rolled coil of example 1;
FIG. 3 shows the thickness and shape of the head of a low carbon steel scale hot rolled coil in a comparative example;
FIG. 4 shows the thickness and shape of the tail of the low carbon steel scale hot rolled coil in the comparative example.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings.
Examples 1 to 3
The chemical components and the weight percentage of the low-carbon steel plate easy to pickle in the CSP process are shown in Table 1.
TABLE 1 chemical composition of low carbon steel sheet in examples and comparative examples (weight percent, wt%)
The preparation method of the low-carbon steel plate easy to pickle in the CSP process comprises the following steps: the method comprises the following steps of molten iron pretreatment, converter smelting, argon blowing station, LF furnace refining, CSP continuous casting, heating, high-pressure water descaling, hot rolling, laminar cooling, reeling and air cooling to room temperature. The thickness of the continuously cast slab is controlled to be 70mm, the process parameters of the heating, high-pressure water descaling, hot rolling, laminar cooling and coiling steps are controlled to be shown in table 2, the thicknesses of the scale scales of the examples and the comparative examples are shown in table 3, and the compositions of the scale of the examples and the comparative examples are shown in table 4.
TABLE 2 Rolling Process parameters for the examples and comparative examples
| Example 1 | Example 2 | Example 3 | Comparative example | |
| Heating and tapping temperature (. degree.C.) | 1086 | 1095 | 1089 | 1150 |
| Coefficient of excess air | 1.08 | 1.15 | 1.25 | 1.29 |
| Descaling Water pressure (MPa) | 20 | 25 | 28 | 30 |
| Initial Rolling temperature (. degree.C.) | 968 | 991 | 985 | 1100 |
| Finish Rolling temperature (. degree.C.) | 785 | 781 | 779 | 881 |
| Rolling speed (m/s) | 4.2 | 4.8 | 4.6 | 4.2 |
| Cooling Rate (. degree. C/s) | 26 | 25 | 30 | 29 |
| Coiling temperature (. degree.C.) | 661 | 654 | 669 | 681 |
TABLE 3 examples and comparative examples scale thicknesses
TABLE 4 examples and comparative examples scale compositional phase ratios
| Numbering | FeO(％) | Fe3O4(％) |
| Example 1 | 15～20 | 80～85 |
| Example 2 | 10～15 | 85～90 |
| Example 3 | 8～13 | 87～92 |
| Comparative example | <5 | >95 |
As can be seen from tables 3 and 4, in the low-carbon steel plates in the examples and the comparative examples with the same specification, the thickness of the scale of the low-carbon steel plate produced by the invention is reduced by 35-40% compared with that of the low-carbon steel plate produced by the comparative example, and the proportion of FeO is increased by 15-20%.
The above detailed description of a CSP process easy-pickling low carbon steel sheet and its manufacturing method with reference to the examples is illustrative and not restrictive, and several examples can be cited within the limits thereof, and thus, variations and modifications thereof without departing from the general concept of the present invention shall fall within the scope of the present invention.
Claims (5)
1. The easy-pickling low-carbon steel plate for the CSP process is characterized by comprising the following chemical components in percentage by weight: c: 0.024-0.048%; si: 0.02-0.025%; mn: 0.08-0.12%; p: less than or equal to 0.013 percent; s:
less than or equal to 0.004 percent; al: 0.024-0.057%; the balance of Fe and inevitable impurities;
the manufacturing method of the low-carbon steel plate easy to pickle in the CSP process comprises the following steps: the method comprises the following steps of molten iron pretreatment, converter smelting, argon blowing station, LF furnace refining, CSP continuous casting, heating, high-pressure water descaling, hot rolling, laminar cooling and coiling;
in the heating step, the casting blank enters a roller hearth type heating furnace and is heated at a low temperature, and the discharging temperature of the casting blank is controlled to be 1000-1100 ℃;
in the hot rolling step, the initial rolling temperature is 960-1000 ℃, and the final rolling temperature is controlled at 760-800 ℃; the rolling speed is not lower than 4.0 m/s;
the coiling temperature is 600-680 ℃;
in the laminar cooling step, the cooling speed is 20-40 ℃/s.
2. The CSP process easy-pickling low carbon steel plate as claimed in claim 1, wherein in the heating step, the air excess coefficient of each zone in the heating furnace is controlled to be 1.05-1.30.
3. The CSP process easy-pickling low carbon steel plate as claimed in claim 1, wherein the descaling water pressure is controlled to not less than 20MPa in the high pressure water descaling step.
4. The CSP process easy-pickling low carbon steel plate as claimed in claim 1, wherein in the hot rolling step, the secondary descaling water is opened after the F1 and F2 stands and the cooling water is opened between the stands.
5. The CSP process easy-pickling low carbon steel plate as claimed in claim 1, wherein the step of coiling further comprises air cooling to room temperature.
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| CN109940043B (en) * | 2019-04-09 | 2020-07-03 | 唐山市德龙钢铁有限公司 | Preparation method of hot rolled strip steel easy to pickle |
| CN111575465A (en) * | 2020-05-13 | 2020-08-25 | 武汉钢铁有限公司 | Production method for preventing surface of hot-rolled pickled steel from blackening |
| CN111944974B (en) * | 2020-07-23 | 2022-05-03 | 武汉钢铁有限公司 | Method for producing thin-specification strip steel with good surface quality based on CSP (compact strip production) process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57145934A (en) * | 1981-03-05 | 1982-09-09 | Kawasaki Steel Corp | Production of low carbon hot-rolled steel strip of superior carburizability |
| JP2004107722A (en) * | 2002-09-18 | 2004-04-08 | Nippon Steel Corp | Method for manufacturing steel sheet for clutch plate having excellent adhesiveness to friction material |
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| CN102266868B (en) * | 2011-08-05 | 2013-06-19 | 河北钢铁股份有限公司邯郸分公司 | Production method for pickling steel with reduced acid |
| CN102699030B (en) * | 2012-05-30 | 2014-05-14 | 东北大学 | Preparation method of sheet billet continuous casting and rolling easy-acid washing hot rolling strip steel |
| CN102925791B (en) * | 2012-11-05 | 2015-01-07 | 武汉钢铁(集团)公司 | Steel easy to pickle and production method of steel |
| CN103937951A (en) * | 2014-04-16 | 2014-07-23 | 河北钢铁股份有限公司邯郸分公司 | Pickling deep-drawing board production process method for CSP (Compact Strip Production) production line |
| CN106244921B (en) * | 2016-08-30 | 2018-05-01 | 武汉钢铁有限公司 | A kind of method in CSP producing lines using rolling in ferrite domains production mild steel |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57145934A (en) * | 1981-03-05 | 1982-09-09 | Kawasaki Steel Corp | Production of low carbon hot-rolled steel strip of superior carburizability |
| JP2004107722A (en) * | 2002-09-18 | 2004-04-08 | Nippon Steel Corp | Method for manufacturing steel sheet for clutch plate having excellent adhesiveness to friction material |
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