CN110508629B - Method for eliminating defects of landscape painting on surface of low-carbon aluminum killed steel after acid pickling - Google Patents
Method for eliminating defects of landscape painting on surface of low-carbon aluminum killed steel after acid pickling Download PDFInfo
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- CN110508629B CN110508629B CN201910665591.7A CN201910665591A CN110508629B CN 110508629 B CN110508629 B CN 110508629B CN 201910665591 A CN201910665591 A CN 201910665591A CN 110508629 B CN110508629 B CN 110508629B
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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
- 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
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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
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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
- B21B45/004—Heating the product
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- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention provides a method for eliminating the defect of a landscape painting on the surface of low-carbon aluminum killed steel after acid pickling, which comprises the following steps: the defects of landscape painting on the surface of the low-carbon aluminum killed steel after acid washing are avoided by controlling the temperature of the plate blank in the heating furnace, the time in the furnace, the thickness of the intermediate blank and the like. The method is simple, economical and efficient, and the defects of the surface 'landscape painting' of the low-carbon aluminum killed steel after acid pickling can be eliminated by reasonably setting the parameters of the charging temperature, the charging time and the thickness of the intermediate billet of the hot-rolled plate blank under the conditions of the components of the existing steel grade and the existing equipment.
Description
Technical Field
The invention belongs to the technical field of steel rolling production, and particularly relates to a method for eliminating the landscape painting defect on the surface of low-carbon aluminum killed steel after acid washing.
Background
In view of the cost pressure of automobile structural parts, air conditioners and refrigerator compressors in the automobile industry, a plurality of products are cooled in hot zones, and acid pickling products become main products in the years, and under the situation, high surface requirements are put on acid pickling surfaces, and any surface defects and flaws are not allowed.
The steel grade of the clutch of the automobile structural part mainly comprises DD11, DD12 and DD13, the steel grade of the compressor mainly comprises SPHC, SPHD and SPHE steel grades, and if the oxide scales on the surface of a rough rolling area are not completely removed in the hot rolling process, the defect of pressing the oxide scales into the area is easily caused, namely the defect of 'landscape painting', so that the subsequent electrophoresis quality and the surface quality of a finished product are influenced.
Disclosure of Invention
In view of the above, the invention provides a method for eliminating the defects of the landscape painting on the surface of the low-carbon aluminum killed steel after acid pickling, which realizes the elimination of the defects of the landscape painting after acid pickling by controlling the temperature of a plate blank entering a heating furnace, the time of the plate blank in the furnace and the thickness of an intermediate blank.
The invention provides a method for eliminating the defect of a landscape painting on the surface of low-carbon aluminum killed steel after acid pickling, which comprises the following steps:
s1, feeding the plate blank obtained by continuously casting the low-carbon aluminum killed steel into a hot rolling line heating furnace, and controlling the temperature of the plate blank in the heating furnace to be less than or equal to 400 ℃ and the furnace time to be less than or equal to 250 min;
s2, carrying out multi-pass rough rolling on the heated plate blank to obtain an intermediate blank, and controlling the thickness of the intermediate blank to be 25-30 mm;
and S3, finish rolling the intermediate billet into a hot rolled coil, and pickling the hot rolled coil to obtain the low-carbon aluminum killed steel without the landscape painting defect on the surface.
Preferably, in step S1, when the temperature of the heating furnace is 220-400 ℃, the furnace time is less than or equal to 170 min; when the temperature of the heating furnace is less than or equal to 220 ℃, the furnace time is less than or equal to 250 min.
More preferably, in step S1, the heating furnace temperature is 400 ℃., the furnace time is 150-; when the temperature of the heating furnace is less than or equal to 220 ℃, the furnace time is less than or equal to 250 min.
Preferably, the low carbon aluminum killed steel is one of SPHC, SPHD, SPHE, DD11, DD12 or DD13 steel.
Preferably, the thickness specification of the low-carbon aluminum killed steel is 4-7 mm.
Compared with the prior art, the invention has the beneficial effects that:
(1) the thickness of the surface iron scale and the adhesive force between the surface iron scale and the plate blank are controlled by controlling the temperature of the plate blank in a heating furnace, the time in the furnace, the thickness of the intermediate blank and the like, so that the defect of 'landscape painting' on the surface of the low-carbon aluminum killed steel after acid pickling is effectively avoided;
(2) the method is suitable for the hot rolling process of the low-carbon aluminum killed steel pickled plate, the principle of the method is suitable for a low-carbon aluminum killed steel rolling production line, and the method can be realized only by parameter adjustment under the conditions of the existing steel type components, hot rolling production process and equipment, is convenient, economic and efficient, and has good application prospect.
Drawings
FIG. 1 is a surface quality chart of pickled steel sheets obtained by Process 1 in example 1;
FIG. 2 is a surface quality chart of pickled steel sheets obtained by the process 2 in example 1;
FIG. 3 is a surface quality chart of pickled steel sheets obtained by Process 3 in example 1;
FIG. 4 is a surface quality chart of pickled steel sheets obtained by the process 1 in example 2;
FIG. 5 is a surface quality chart of pickled steel sheets obtained by the process 2 in example 2;
FIG. 6 is a surface quality chart of pickled steel sheets obtained by Process 1 in example 3;
FIG. 7 is a surface quality chart of pickled steel sheets obtained by the process 2 in example 3;
FIG. 8 is a surface quality chart of pickled steel sheets obtained by Process 3 in example 3.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the following examples, but the scope of the present invention is not limited to the following specific examples.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The invention provides a method for eliminating the defect of a landscape painting on the surface of low-carbon aluminum killed steel after acid pickling, which comprises the following steps:
s1, feeding the plate blank obtained by the continuous casting of the low-carbon aluminum killed steel into a hot rolling line heating furnace, controlling the temperature of the heating furnace and the time in the furnace: the furnace time is less than or equal to 170min when the temperature of the furnace is 400 ℃ and is preferably 150 ℃ and 170 min; when the temperature of the heating furnace is less than or equal to 220 ℃, the furnace time is less than or equal to 250 min. (ii) a
S2, carrying out multi-pass rough rolling on the heated plate blank to obtain an intermediate blank, and controlling the thickness of the intermediate blank to be 25-30 mm;
s3, finish rolling the intermediate billet into a hot rolled coil, and pickling the hot rolled coil to obtain the low-carbon aluminum killed steel without the landscape painting defect on the surface, wherein the low-carbon aluminum killed steel is one of SPHC, SPHD, SPHE, DD11, DD12 or DD13 steel, and the thickness specification of the low-carbon aluminum killed steel is 4-5 mm.
The invention avoids the defect of landscape painting on the surface by mainly controlling the temperature of the plate blank entering the furnace, the time in the furnace and the thickness of the intermediate blank, and the parameters have the following influence on the defect:
1. influence of the charging temperature and the on-furnace time of the slab
The slab is delivered into a slab warehouse for storage after being taken off the line of the continuous casting machine, and the temperature range of the slab subsequently put into a hot rolling line heating furnace is different from room temperature to 700 ℃, which is usually determined according to the actual production scheduling condition of a production line. For most steel grades, the charging temperature and the in-furnace time of the slab have no obvious influence on the product quality, so that no special regulation is provided, but the inventor finds that the charging temperature and the in-furnace time of the slab have direct influence on the defects of the surface 'landscape painting' after the pickling of the low-carbon aluminum killed steel in the research process. The temperature of the slab entering the heating furnace must be less than or equal to 400 ℃, and the temperature of the slab entering the furnace and the time in the furnace must be matched. If the charging temperature of the slab is less than or equal to 220 ℃ (cold charging), the charging time is less than or equal to 250min, and if the charging temperature is 220 ℃ and 400 ℃ (warm charging), the charging time is less than or equal to 170 min. The process matching is most beneficial to eliminating the landscape painting defect on the surface after acid cleaning, and the principle of the process is mainly to influence the adhesive force of the high-temperature iron scale.
2. Influence of thickness of intermediate blank
The plate blank is rolled into an intermediate blank after rough rolling for multiple times, and then is rolled into a hot rolled coil after finish rolling. For most steel grades, the thickness of the intermediate slab is generally determined according to the final thickness of the hot rolled coil and the state of the rolling mill at that time, by not strictly controlling the thickness of the intermediate slab, and varies from 30mm to 50 mm. However, in the research process, the inventor of the patent finds that the thickness of the intermediate blank has obvious influence on the occurrence and severity of the defects of subsequent landscape painting, the thickness of the intermediate blank is further reduced to 25-30mm, and the defects of the surface landscape painting after acid cleaning can be effectively eliminated. The principle mainly influences the state of an interface of an iron scale and a steel matrix.
The method for eliminating the landscape painting defect on the surface of the low-carbon aluminum killed steel after acid cleaning is provided by the invention and is explained in detail by combining a plurality of examples.
Example 1
The low carbon aluminum killed steel used in this example, steel grade SPHC, specification 4mm x 1450 mm. Three different processes are adopted in the same production plan list, and the influence of the furnace feeding temperature corresponding to each process on the surface quality after pickling is compared.
The process 1 comprises the following steps: the plate blank obtained by the continuous casting of the low-carbon aluminum killed steel enters a hot rolling line heating furnace, and the temperature range of the plate blank entering the heating furnace is 500-550 ℃;
and (2) a process: the slab obtained by the continuous casting of the low-carbon aluminum killed steel enters a hot rolling line heating furnace, and the temperature of the slab entering the heating furnace is 250-400 ℃;
and (3) a process: and (3) feeding the plate blank obtained by the continuous casting of the low-carbon aluminum killed steel into a hot rolling line heating furnace, wherein the temperature of the plate blank in the heating furnace is less than or equal to 100 ℃.
The in-furnace time of the three processes is uniformly controlled within 150-170min, the thickness of an intermediate blank obtained after the heated plate blank is subjected to multi-pass rough rolling is 30mm, the intermediate blank is subjected to finish rolling to form a hot rolled coil, the hot rolled coil is subjected to acid pickling to obtain low-carbon aluminum killed steel, and the surface quality condition is followed after the acid pickling. The rolling parameters are as follows: the tapping temperature is 1200 ℃, the RT21010 ℃, the finishing temperature is 870 ℃, and the coiling temperature is 620 ℃; the pickling parameters are as follows: the highest speed of acid washing threading is 100m/min, the highest running speed is 150m/min, and the tail flicking speed is 120 m/min. The processes 1 to 3 are different in charging temperature, the rolling and pickling processes are consistent, and each group of experiments has 20 blocks.
The surface quality results after pickling are shown in FIGS. 1 to 3.
As can be seen from the graphs in FIGS. 1-3, under the condition that the low-carbon aluminum killed steel is in the furnace time of 150-.
Example 2
The low carbon aluminum killed steel used in this example, steel grade SPHD, specification 5mm 1450 mm.
Two different processes are adopted in the same production plan list, and the influence of the furnace time corresponding to each process on the surface quality after pickling is compared.
The process 1 comprises the following steps: the plate blank obtained by the continuous casting of the low-carbon aluminum killed steel enters a hot rolling line heating furnace, the furnace entering temperature range is 300-400 ℃, and the furnace time is controlled to be 250 min;
and (2) a process: the plate blank obtained by the continuous casting of the low-carbon aluminum killed steel enters a hot rolling line heating furnace, the furnace entering temperature range is 300-;
the plate blank heated by the two processes is subjected to multi-pass rough rolling to obtain an intermediate blank of 30mm, the intermediate blank is subjected to finish rolling to form a hot rolled coil, the hot rolled coil is subjected to acid pickling to obtain low-carbon aluminum killed steel, and the surface quality condition is followed after acid pickling. Process 1-2 the rolling and pickling processes were identical to those of example 1 except for the differences in the furnace time, with 20 runs per set. The surface quality results after pickling are shown in FIGS. 4-5.
As can be seen from FIGS. 4-5, under the condition that the low-carbon aluminum killed steel is at the furnace entry temperature of 300-400 ℃, when the furnace time of the process 1 is longer than 250min, the surface of the hot coil after acid cleaning has obvious landscape painting defects, and when the furnace time of the process 2 is shorter than 150min, the surface of the hot coil after acid cleaning has good quality and no landscape painting defects.
Example 3
The low carbon aluminum killed steel used in this example, steel grade SPHE, specification 4.3mm 1350 mm.
Three different processes are adopted in the same production plan list, and the influence of the thickness of the intermediate blank corresponding to each process on the surface quality after pickling is compared.
The process 1 comprises the following steps: feeding the plate blank obtained by the continuous casting of the low-carbon aluminum killed steel into a hot rolling line heating furnace, wherein the furnace feeding temperature range is 300-400 ℃, the furnace time is 250min, the heated plate blank is subjected to multi-pass rough rolling to obtain an intermediate blank, and the thickness of the intermediate blank is controlled to be 25 mm;
and (2) a process: feeding the plate blank obtained by the continuous casting of the low-carbon aluminum killed steel into a hot rolling line heating furnace, wherein the furnace feeding temperature range is 300-400 ℃, the furnace time is 250min, the heated plate blank is subjected to multi-pass rough rolling to obtain an intermediate blank, and the thickness of the intermediate blank is controlled to be 35 mm;
and (3) a process: and (3) feeding the plate blank obtained by the low-carbon aluminum killed steel continuous casting into a hot rolling line heating furnace, wherein the furnace feeding temperature range is 300-400 ℃, the furnace time is 250min, the heated plate blank is subjected to multi-pass rough rolling to obtain an intermediate blank, and the thickness of the intermediate blank is controlled to be 45 mm.
And (3) finely rolling the intermediate billets of the three processes into hot rolled coils, pickling the hot rolled coils to obtain the low-carbon aluminum killed steel, and subsequently pickling to trace the surface quality condition. Processes 1-3 the rolling and pickling processes were identical to example 1 except for the differences in the thickness of the intermediate slab, with 20 runs per set. The surface quality results after pickling are shown in FIGS. 6 to 8.
As can be seen from FIGS. 6-8, when the thickness of the intermediate billet of the low-carbon aluminum killed steel is 35mm and 45mm, the acid-washed surface of the hot coil has obvious landscape painting defects, and when the thickness of the intermediate billet is reduced to 25mm, the acid-washed surface of the hot coil has good quality and no landscape painting defects.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (3)
1. A method for eliminating the defects of landscape painting on the surface of low-carbon aluminum killed steel after acid pickling comprises the following steps:
s1, feeding the plate blank obtained by continuously casting the low-carbon aluminum killed steel into a hot rolling line heating furnace, controlling the temperature of the plate blank in the heating furnace to be less than or equal to 400 ℃, and controlling the time of the plate blank in the heating furnace to be less than or equal to 250 min;
s2, carrying out multi-pass rough rolling on the heated plate blank to obtain an intermediate blank, and controlling the thickness of the intermediate blank to be 25-30 mm;
s3, finish rolling the intermediate billet into a hot rolled coil, and pickling the hot rolled coil to obtain the low-carbon aluminum killed steel without the landscape painting defect on the surface;
wherein the rolling parameters are as follows: the tapping temperature is 1200 ℃, the RT21010 ℃, the finishing temperature is 870 ℃, and the coiling temperature is 620 ℃; the pickling parameters are as follows: the highest pickling threading speed is 100m/min, the highest running speed is 150m/min, the tail flicking speed is 120m/min, the low-carbon aluminum killed steel is one of SPHC, SPHD, SPHE, DD11, DD12 or DD13 steel, and the thickness specification of the low-carbon aluminum killed steel is 4-7 mm.
2. The method for eliminating the landscape painting defect on the pickled surface of the low-carbon aluminum killed steel as recited in claim 1, wherein: in step S1, when the temperature of the heating furnace is 220-400 ℃, the furnace time is less than or equal to 170 min; when the temperature of the heating furnace is less than or equal to 220 ℃, the furnace time is less than or equal to 250 min.
3. The method for eliminating the landscape painting defect on the pickled surface of the low-carbon aluminum killed steel as recited in claim 2, wherein: in step S1, the heating furnace temperature is 400 ℃ and the furnace time is 170min and 150; when the temperature of the heating furnace is less than or equal to 220 ℃, the furnace time is less than or equal to 250 min.
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| CN105689408A (en) * | 2016-03-07 | 2016-06-22 | 首钢京唐钢铁联合有限责任公司 | Hot rolling control method for iron scale on edge of low-carbon aluminum killed steel |
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| CN102174683B (en) * | 2011-01-30 | 2012-10-10 | 首钢总公司 | Method for producing cold-rolling low-carbon aluminum killed steel with uniform through plate mechanical property |
| CN104324958A (en) * | 2014-09-24 | 2015-02-04 | 首钢总公司 | Method for overcoming surface landscape painting defects after LCAK steel pickling |
| CN107779743A (en) * | 2016-08-30 | 2018-03-09 | 上海梅山钢铁股份有限公司 | Micro- carbon hot rolling acid-cleaning steel plate and its manufacture method with good deep drawability |
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| CN105689408A (en) * | 2016-03-07 | 2016-06-22 | 首钢京唐钢铁联合有限责任公司 | Hot rolling control method for iron scale on edge of low-carbon aluminum killed steel |
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| Title |
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| 酸洗板山水画缺陷产生机理及影响因素的分析;崔秋艳;《中国冶金》;20190715(第7期);第44-49页 * |
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