CN112139244A - Rolling method for eliminating surface oxygen spot defect of hot-rolled and acid-washed enameled steel plate - Google Patents
Rolling method for eliminating surface oxygen spot defect of hot-rolled and acid-washed enameled steel plate Download PDFInfo
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- CN112139244A CN112139244A CN201910558155.XA CN201910558155A CN112139244A CN 112139244 A CN112139244 A CN 112139244A CN 201910558155 A CN201910558155 A CN 201910558155A CN 112139244 A CN112139244 A CN 112139244A
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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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- 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
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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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
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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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0269—Cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2275/00—Mill drive parameters
- B21B2275/02—Speed
- B21B2275/06—Product speed
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Abstract
The invention discloses a rolling method for eliminating the surface oxygen spot defect of a hot-rolled acid-washed enameled steel plate, which mainly solves the technical problem that the surface oxygen spot defect of the existing hot-rolled acid-washed enameled steel plate cannot be eliminated. The technical scheme of the invention is as follows: a rolling method for eliminating the surface oxygen spot defect of hot-rolled and acid-washed enameled steel plates comprises the following steps: heating the continuous casting plate blank, wherein the heating temperature of the continuous casting plate blank is 1150-1190 ℃; descaling the continuous casting slab by using high-pressure water; carrying out hot rolling on the continuous casting plate blank, wherein the hot rolling adopts a two-stage controlled rolling process; carrying out laminar cooling on the finish-rolled steel plate, wherein the front section of the laminar cooling is adopted, and the mass volume concentration of Cl ions in laminar cooling water is less than or equal to 220 mg/L; the hot-rolled steel sheet is coiled. The method reduces the residue of primary iron scale, obviously improves the surface quality of the enamel steel and has low production cost.
Description
Technical Field
The invention relates to a hot continuous rolling production method of a hot-rolled acid-washed enameled steel plate, in particular to a rolling method for eliminating the surface oxygen spot defect of the hot-rolled acid-washed enameled steel plate, and belongs to the technical field of metal rolling and hot continuous rolling.
Background
The enamel steel is safe, non-toxic, easy to wash and clean, has both the mechanical strength of metal and the gorgeous appearance of enamel as well as the performance of chemical corrosion resistance, and is widely used as diet utensils and washing appliances in daily life. Due to the continuous progress of scientific technology, the increasing demand of consumers and the increasing competition of the market, the yield and the quality of the enameled pressed steel are urgently improved.
In order to reduce the cost, the market has developed a trend of replacing the cold-rolled enameled steel sheet with the hot-rolled enameled steel sheet, which puts higher demands on the surface properties of the hot-rolled steel sheet. The quality of the cold-rolled sheet is far higher than that of the hot-rolled sheet, such as surface and size precision, so that the production difficulty of the hot-rolled pickled sheet is extremely high.
The design chemical composition requirements of the common steel grade of the hot-rolled acid-washed enameled pressed steel are that C is less than or equal to 0.16 percent, Si is less than or equal to 0.05 percent, Mn is less than or equal to 0.90 percent, P is less than or equal to 0.035 percent, S is less than or equal to 0.035 percent, Alt is more than or equal to 0.010 percent, and other alloy elements can be added according to the actual requirements.
Because the hot-rolled pickled enameled steel plate is produced by a hot-rolling production process structure, the production process in an austenite state is necessarily accompanied by oxidation, and the existence of iron scales is necessarily caused. The oxygen spot defect of the enamel steel pickled plate refers to the defect that after hot rolling and pickling, the surface has irregular color difference spots, is in landscape painting appearance and has serious hand feeling. The defects are not clear in the cause for a long time, and the pickling line is subjected to measures of increasing the concentration and the temperature of the acid liquor, reducing the pickling speed and the like, but the defects are not obviously improved. And the hot coil surface defects corresponding to the defects cannot be found from the hot rolling online detection system. Therefore, the oxygen spot defect of the enamel steel pickled plate cannot be detected in a hot rolling surface detection system, can be found only in a downstream production process, has the characteristics of long detection period and large loss, and always solves the core problem of production of high-quality enamel steel pickled plate products.
The application publication No. CN104826872A discloses a controlled rolling method for eliminating the surface color difference defect of hot rolled strip steel, which comprises the steps of placing a continuously cast plate blank in a heating furnace for heat treatment, removing scale from the plate blank with high pressure water after discharging, and removing primary scale; carrying out 3-5 times of rough rolling on the plate blank, and descaling by adopting odd number of times; then the plate blank entering the finishing mill is descaled for 1 time and then is finish-rolled by 7 stands, and is put into hot rolling lubrication by 2-6 stands, and is coiled after the front section is cooled. The invention can obviously improve the transverse uniformity of the iron scale of the hot-rolled strip steel compared with the traditional process, has more reasonable structure of the iron scale, effectively eliminates the surface color difference defect of the hot-rolled strip steel and ensures the surface quality of the hot-rolled strip steel. However, the tapping temperature of the invention is higher, up to 1250 ℃, the tapping temperature is higher, the heating time is longer, the oxidation weight gain degree is higher, namely the oxidation degree of the steel plate is higher, if the subsequent descaling is incomplete, primary scale on the finished product hot plate can be remained.
The prior art lacks a method for eliminating the surface oxygen spot defect of the hot-rolled and acid-washed enameled steel sheet.
Disclosure of Invention
The invention aims to provide a rolling method for eliminating the surface oxygen spot defect of a hot-rolled acid-washed enameled steel plate, mainly solving the technical problem that the surface oxygen spot defect of the existing hot-rolled acid-washed enameled steel plate cannot be eliminated, improving the surface quality of the hot-rolled acid-washed enameled steel plate and reducing the production cost of the hot-rolled acid-washed enameled steel plate.
The technical scheme of the invention is that the rolling method for eliminating the surface oxygen spot defect of the hot-rolled acid-washed enameled steel plate comprises the following steps:
1) heating the continuous casting plate blank, and heating the continuous casting plate blank in a plate blank heating furnace in a reducing atmosphere environment, wherein the excess air coefficient is 0.90-0.95, and the heating temperature of the continuous casting plate blank is 1150-1190 ℃;
2) descaling the continuous casting slab, and descaling the continuous casting slab by using high-pressure water, wherein the descaling water flow is 307-432 m3H, the descaling water pressure is more than or equal to 210 MPa;
3) carrying out hot rolling on the continuous casting plate blank, wherein the hot rolling adopts a two-stage controlled rolling process, the rough rolling is carried out at the temperature above the austenite recrystallization temperature, and the finish temperature of the rough rolling is 1000-1040 ℃; rolling in an austenite non-recrystallization temperature region in a finish rolling way, wherein the finish rolling speed is 6-18 m/s, and the finish rolling finishing temperature is 850-880 ℃; after finish rolling, the thickness of the steel plate finished product is 1.78-6.00 mm;
4) carrying out laminar cooling on the finish-rolled steel plate, wherein the front section of the laminar cooling is adopted, and the mass volume concentration of Cl ions in laminar cooling water is less than or equal to 220 mg/L;
5) the hot-rolled steel sheet is coiled, and the hot-rolled steel sheet is coiled by a coiling machine, wherein the coiling temperature of the hot-rolled steel sheet is 540-620 ℃.
Further, the heating time of the continuous casting slab is 180-240 min.
Further, the rough rolling is 6-pass continuous rolling, and the finish rolling is 7-pass continuous rolling.
The method of the invention is based on the following studies of the applicant: the oxygen spots belong to primary iron sheets, and are primary iron sheet residues which are not removed by a descaling box behind the furnace, and the part of the residual iron sheets is tightly connected with a matrix and is difficult to remove scales by a conventional method; the residual primary iron scale is relatively compact and has poor air exchange property, and the residual primary iron scale is not further oxidized into high-price red iron scale Fe2O3. Therefore, the primary iron sheet is mainly controlled in the aspect of control. Firstly, the generated primary scale needs to have good uniformity, and the scale residue caused by inconsistent descaling difficulty can be effectively prevented. Secondly, the generation amount of iron sheets is reduced as much as possible, and the more the iron sheets are, the higher the possibility of residue is; thirdly, the descaling and clearing effect is increased, and the descaling and hitting force is improved; and fourthly, increasing descaling passes and removing residual iron scale as far as possible.
The process parameter control of the method of the invention has the following reasons:
1. setting of heating temperature and heating time of continuous casting slab
The heating temperature in the heating furnace is controlled to be wider and lower: 1150-1190 ℃, the lower heating temperature can reduce the generation amount of the iron scale, is easier to control the production, can effectively save energy and reduce the cost.
2. Setting of high-pressure descaling water
The descaling box has large descaling water flow and descaling pressure, and the descaling water flow is 307-432 m3The descaling water pressure is more than or equal to 210 MPa. The scale removed from the furnace is firstly faced with the heated plate blank and the surface scaleThick, loose structure, and small difficulty in cleaning, at least 95% of the furnace iron sheet should be cleaned. However, due to the obstruction of the outer layer iron sheet, the hitting force is weakened when the iron sheet hits the surface layer of the plate blank, the iron sheet which is attached to the surface of the plate blank and has high descaling difficulty sometimes cannot be hit, and the area with small hitting force at the intersection part between the two nozzles is more obvious. The descaling technological parameters can ensure that the descaling water can directly act on the surface of the plate blank, and the large striking force can be fully exerted.
3. Setting of finish Rolling speed
And the finish rolling speed is 6-18 m/s, and the higher the finish rolling speed is, the better the finish rolling speed is on the premise of ensuring the through plate. The requirement of the rolling speed can give consideration to the high rolling speed of the hot rolled plate on one hand and the crushing degree of the iron scale on the other hand.
4. Setting of laminar cooling mode after finish rolling
The lower the Cl ion concentration in the laminar cooling water is, the better the Cl ion concentration is, but the Cl ion concentration relates to the cost, and the Cl ion concentration is comprehensively considered to be less than or equal to 220 mg/L. The hot-rolled laminar cooling water is cooled and then volatilizes on the surface of the steel plate, and residual chlorine-containing salt can form high-concentration chloride ions in a humid environment, and is easy to generate electrochemical reaction with iron ions in the storage stage of the steel plate, so that local pitting corrosion is caused. The salt in the iron scale mainly comes from cooling water and rolling water. The cooling water can be quickly evaporated on the steel plate to leave salt after each rolling pass, and the more the rolling passes, the more the salt is remained. When these salts absorb water (dew condensation on the surface of the steel sheet) during storage to become local droplets or pools, corrosive media with high concentrations are formed, thereby affecting the surface quality of the steel sheet.
5. Setting of coiling temperature in Hot Rolling
The coiling temperature mainly affects the structure and performance of the strip steel. In combination with the component system of the invention, the performance stability is further considered, and the hot rolling coiling temperature is set to be 540-620 ℃.
Compared with the prior art, the invention has the following positive effects: 1. according to the invention, through heating system control, descaling process improvement, cooling water Cl ion concentration control and the like, the primary oxide scale residue is reduced, the surface quality of the enamel steel is obviously improved, and the degradation rate of oxygen spot defects of the acid-pickled enamel steel plate is greatly reduced. 2. The method of the invention adopts wider hot rolling process parameter conditions, can be implemented in most enterprises, is easy to realize and has low production cost.
Drawings
FIG. 1 is an optical microscopic metallographic structure photograph of scale of a hot rolled steel sheet according to example 1 of the present invention.
FIG. 2 is a scanning electron micrograph of scale on a hot rolled steel sheet according to example 1 of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are shown in tables 1 to 2. It should be understood that the following detailed description is illustrative of the invention only and is not intended to limit the scope of the invention.
Table 1 shows the chemical composition (in weight%) of the steels of the examples of the invention, the balance being Fe and unavoidable impurities.
Table 1 chemical composition of the steels of the examples of the invention, in units: weight percent of
| Examples | C | Si | Mn | P | S | Alt | N | Ti |
| Example 1 | 0.04 | 0.04 | 0.25 | 0.016 | 0.007 | 0.030 | 0.005 | 0.035 |
| Example 2 | 0.03 | 0.03 | 0.26 | 0.014 | 0.006 | 0.035 | 0.006 | 0.038 |
| Example 3 | 0.04 | 0.03 | 0.22 | 0.015 | 0.007 | 0.030 | 0.005 | 0.042 |
| Example 4 | 0.06 | 0.04 | 0.6 | 0.013 | 0.006 | 0.035 | 0.007 | 0.040 |
Smelting the molten steel by a converter to obtain the molten steel meeting the requirements of chemical components, and blowing Ar to the molten steel in the refining process of an LF ladle refining furnace; and the continuous casting adopts the whole-process Ar blowing protection casting, and the molten steel is cast into a continuous casting slab.
And after the continuous casting plate blank is heated by a heating furnace, rolling the continuous casting plate blank on a hot continuous rolling mill, controlling the rolling by a rough rolling mill and a finish rolling continuous rolling mill unit, cooling the front section by laminar cooling, and then coiling to produce a hot rolled steel coil. The thickness of the finished hot rolled steel plate is 1.78-6.00 mm. The control parameters of the hot rolling process are shown in a table 2, and the control parameters of the hot rolling high-pressure descaling water and the laminar cooling water are shown in a table 3.
TABLE 2 Hot Rolling Process control parameters of the inventive examples
TABLE 3 Hot Rolling high pressure descaling Water parameters and laminar Cooling Water parameters of examples of the present invention
| Process parameters | Flow rate of descaling water mm3/h | Descaling Water pressure, MPa | Concentration of Cl ion, mg/L |
| Example 1 | 408 | 226 | 197 |
| Example 2 | 396 | 215 | 206 |
| Example 3 | 408 | 223 | 213 |
| Example 4 | 420 | 232 | 168 |
Referring to table 2, table 3, the heating temperature was below 1190 ℃. The finish rolling speed is 8-14 m/s, and the descaling water flow is 396-420 m3The descaling water pressure is more than or equal to 215MPa, and the Cl ion concentration is lower than 213 mg/L.
The surface iron scale of the hot-rolled acid-washed enameled steel plate obtained by the invention is analyzed in metallographic structure and scanning electron microscope appearance, as shown in the figure 1 and 2, the thickness of the surface iron scale of the hot-rolled acid-washed enameled steel plate is uniform and compact, as shown in the figure 1; the thickness of the iron scale is about 5-8.5 μm, and the iron scale is well combined with the matrix, as shown in figure 2. The hot-rolled acid-washed enameled pressed steel is acid-washed by an acid rolling line, the surface quality is excellent, and the defect of oxygen spots is not seen.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope of the present invention.
Claims (3)
1. A rolling method for eliminating the surface oxygen spot defect of hot-rolled and acid-washed enameled steel plates is characterized by comprising the following steps:
1) heating the continuous casting plate blank, and heating the continuous casting plate blank in a plate blank heating furnace in a reducing atmosphere environment, wherein the excess air coefficient is 0.90-0.95, and the heating temperature of the continuous casting plate blank is 1150-1190 ℃;
2) descaling the continuous casting slab, and descaling the continuous casting slab by using high-pressure water, wherein the descaling water flow is 307-432 m3H, the descaling water pressure is more than or equal to 210 MPa;
3) carrying out hot rolling on the continuous casting plate blank, wherein the hot rolling adopts a two-stage controlled rolling process, the rough rolling is carried out at the temperature above the austenite recrystallization temperature, and the finish temperature of the rough rolling is 1000-1040 ℃; rolling in an austenite non-recrystallization temperature region in a finish rolling way, wherein the finish rolling speed is 6-18 m/s, and the finish rolling finishing temperature is 850-880 ℃; after finish rolling, the thickness of the steel plate finished product is 1.78-6.00 mm;
4) carrying out laminar cooling on the finish-rolled steel plate, wherein the front section of the laminar cooling is adopted, and the mass volume concentration of Cl ions in laminar cooling water is less than or equal to 220 mg/L;
5) the hot-rolled steel sheet is coiled, and the hot-rolled steel sheet is coiled by a coiling machine, wherein the coiling temperature of the hot-rolled steel sheet is 540-620 ℃.
2. The rolling method for eliminating the oxygen spot defect on the surface of the hot-rolled and acid-washed enameled steel sheet according to claim 1, wherein the heating time of the continuous casting slab is 180-240 min.
3. The rolling method for eliminating the oxygen spot defect on the surface of the hot-rolled and acid-washed enameled steel plate according to claim 1, wherein the rough rolling is 6-pass continuous rolling and the finish rolling is 7-pass continuous rolling.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113290047A (en) * | 2021-05-21 | 2021-08-24 | 新余钢铁股份有限公司 | Processing method of low-carbon acid-washing steel substrate |
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| CN113290047A (en) * | 2021-05-21 | 2021-08-24 | 新余钢铁股份有限公司 | Processing method of low-carbon acid-washing steel substrate |
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Application publication date: 20201229 |