CN115228934A - Method for improving surface cleanliness of cold-hard coil of hot-dip aluminum-silicon product - Google Patents
Method for improving surface cleanliness of cold-hard coil of hot-dip aluminum-silicon product Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 57
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 230000003749 cleanliness Effects 0.000 title claims abstract description 42
- 239000000839 emulsion Substances 0.000 claims abstract description 48
- 238000005097 cold rolling Methods 0.000 claims abstract description 43
- 230000007797 corrosion Effects 0.000 claims abstract description 41
- 238000005260 corrosion Methods 0.000 claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 35
- 239000010959 steel Substances 0.000 claims abstract description 35
- 239000003112 inhibitor Substances 0.000 claims abstract description 34
- 238000005238 degreasing Methods 0.000 claims abstract description 19
- 239000002253 acid Substances 0.000 claims abstract description 12
- 238000005554 pickling Methods 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims description 21
- 238000007747 plating Methods 0.000 claims description 19
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 17
- 229910052804 chromium Inorganic materials 0.000 claims description 13
- 239000011651 chromium Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 12
- 238000011282 treatment Methods 0.000 claims description 9
- 239000003513 alkali Substances 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 8
- 230000001680 brushing effect Effects 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 35
- 239000003921 oil Substances 0.000 abstract description 25
- 229910052742 iron Inorganic materials 0.000 abstract description 17
- 238000002310 reflectometry Methods 0.000 abstract description 14
- 230000006872 improvement Effects 0.000 abstract description 6
- 235000019198 oils Nutrition 0.000 description 23
- 230000008569 process Effects 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 15
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 238000005096 rolling process Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000005201 scrubbing Methods 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000010731 rolling oil Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 235000019614 sour taste Nutrition 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
Images
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
- B21B1/28—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 cold-rolling, e.g. Steckel cold mill
-
- 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
- B21B45/0239—Lubricating
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a method for improving the surface cleanliness of a cold-hard coil of a hot-dipped aluminum-silicon product, belonging to the technical field of cold rolling. The method comprises the following steps: obtaining a hot-rolled steel coil of the hot-dip aluminum-silicon product; adding a preheated corrosion inhibitor into the hot-rolled steel coil, and then carrying out acid pickling to obtain acid-pickled strip steel; adding the acid-washed strip steel into emulsion for 5 times of cold rolling to obtain a cold-hard coil; wherein the mass fraction of the emulsion used in the 1-4 cold rolling passes is 3-4%, and the mass fraction of the emulsion used in the 5 cold rolling passes is 0.7-0.9%; and degreasing the chilled coil to obtain the chilled coil with high surface cleanliness. The invention obviously improves the surface cleanliness of the cold-hardened hot-dipped aluminum-silicon product, and the residual oil before improvement is 700mg/m 2 200mg/m of residual iron 2 The reflectivity is 45 percent, and is improved to 240mg/m of improved residual oil 2 Residual iron 45mg/m 2 The reflectance was 92%.
Description
Technical Field
The invention relates to the technical field of cold rolling, in particular to a method for improving the surface cleanliness of a cold-hard coil of a hot-dip aluminum-silicon product.
Background
With the development of steel technology in China, the requirements of quality indexes such as strength, atmospheric corrosion resistance, low-temperature impact resistance and the like of part of high-strength and high-nitrogen steel are higher and higher. The nitrogen component of the high-nitrogen steel is always required to be accurately controlled, the problem that the yield strength is influenced due to too low nitrogen content and the defect that the nitrogen is easily separated out due to too high nitrogen content is avoided. In the existing methods for producing high-nitrogen steel, two methods of nitriding alloy and nitrogen increasing by nitrogen are generally adopted for control, and the two methods are both used in two procedures of a converter and a refining furnace (LF, RH, CAS). The hot-dip aluminum-silicon steel product is prepared by immersing the pretreated steel material into molten silicon-aluminum alloy, keeping the temperature for a certain time, and taking out the steel material to coat a silicon-aluminum alloy coating on the surface of the steel material by diffusion. The silicon-aluminum coated steel plate has the characteristics of high temperature resistance, corrosion resistance and the like, has good surface appearance, is particularly suitable for being used in a high-temperature environment, has good high temperature resistance, can keep bright appearance when the temperature is lower than 450 ℃, and can not be oxidized and discolored until the temperature is higher than 500 ℃. Because aluminum and iron are diffused mutually and an iron-aluminum alloy layer which is difficult to dissolve and compact is thickened, the heat resistance of the alloy is equivalent to that of 409 stainless steel. The silicon-aluminum coated steel plate also has excellent corrosion resistance, and a dense AlO3 oxide film formed by the oxidation of the surface of aluminum isolates a steel base from an oxidation medium, so that the coating cannot be further corroded even under severe environmental conditions, the corrosion resistance of the coating is very strong, the coating has good corrosion resistance to nitric acid, seawater and the like, and the corrosion resistance of the silicon-aluminum coated steel plate is far greater than that of a galvanized steel plate. The hot-dip aluminum-silicon coating product has the characteristics of high temperature resistance and corrosion resistance, and is widely applied to industries such as automobiles, household appliances and the like.
However, the hot-dip aluminum-silicon product has high production difficulty and surface quality defects such as plating missing and the like are easy to occur, so the hot-dip process production has high requirements on the quality of raw materials and particularly has strict requirements on the surface cleanliness of cold-hard coils.
Therefore, how to develop a method for improving the surface cleanliness of the cold-hard coil of the hot-dipped aluminum-silicon product becomes a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a method for improving the surface cleanliness of a cold-hard coil of a hot-dip aluminum-silicon product, and the improvement of the surface cleanliness of the cold-hard coil of the aluminum-silicon product is realized.
In order to achieve the aim, the invention provides a method for improving the surface cleanliness of a cold hard coil of a hot-dip aluminum-silicon product, which comprises the following steps:
obtaining a hot-rolled steel coil of the hot-dip aluminum-silicon product;
adding a preheated corrosion inhibitor into the hot-rolled steel coil, and then carrying out acid pickling to obtain acid-pickled strip steel;
adding the acid-washed strip steel into emulsion for 5 times of cold rolling to obtain a cold-hard coil; wherein the mass fraction of the emulsion used in the 1 st to 4 th cold rolling is 3 to 4 percent, and the mass fraction of the emulsion used in the 5 th cold rolling is 0.7 to 0.9 percent;
and degreasing the chilled coil to obtain the chilled coil with high surface cleanliness.
Furthermore, the mass fraction of the corrosion inhibitor is 0.3-0.5%.
Further, the corrosion inhibitor is a Kincojing corrosion inhibitor.
Further, the temperature range of the preheated corrosion inhibitor is 85-90 ℃.
Furthermore, 5 cold rolling mills are used for the 5-pass cold rolling, wherein at least one set of chromium plating roller is respectively arranged on the 1-4 cold rolling frames, and 2 sets of chromium plating rollers are arranged on the 5 cold rolling frames.
Further, the emulsion is a Hangao P3-multan S emulsion. .
Further, the mass fraction of the emulsion used in the 5-pass cold rolling is adjusted to 0.7-0.9% 6 hours before production. Further, the liquid level of the emulsion used in the 5-pass cold rolling is controlled to be 70-75%.
Further, the degreasing treatment conditions are as follows: the conductivity of the alkali brushing system is 20-30ms/cm, the conductivity of the electrolytic cleaning system is 60-70ms/cm, and the current of the brush roller is 20-25A.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the invention provides a method for improving the surface cleanliness of a cold-hard coil of a hot-dip aluminum-silicon product, which mainly realizes the improvement of the surface cleanliness of the cold-hard coil of the aluminum-silicon product by carrying out a series of treatments on the cold-hard coil of the aluminum-silicon product in a pickling rolling process and a degreasing process.
Obviously improves the surface cleanliness of the cold-hardened hot-dipped aluminum-silicon product, and the residual oil before improvement is 700mg/m 2 200mg/m of residual iron 2 The reflectivity is 45 percent, and is improved to 240mg/m of improved residual oil 2 45mg/m of residual iron 2 And a reflectivity of 92%.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a method for improving the surface cleanliness of a cold-hard coil of a hot-dipped aluminum-silicon product according to an embodiment of the invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically indicated, various raw materials, reagents, instruments, equipment and the like used in the present invention may be commercially available or may be prepared by existing methods.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
in order to achieve the above object, the present embodiment provides a method for improving surface cleanliness of a cold-hard coil of a hot-dip aluminum-silicon product, including:
s1, obtaining a hot-rolled steel coil of a hot-dip aluminum-silicon product;
s2, adding a preheated corrosion inhibitor into the hot-rolled steel coil, and then carrying out acid pickling to obtain acid-pickled strip steel;
s3, adding the acid-washed strip steel into emulsion to perform cold rolling for 5 times to obtain a cold-hard coil; wherein the mass fraction of the emulsion used in the 1 st to 4 th cold rolling is 3 to 4 percent, and the mass fraction of the emulsion used in the 5 th cold rolling is 0.7 to 0.9 percent;
and S4, degreasing the chilled coil to obtain the chilled coil with high surface cleanliness.
According to the method for improving the surface cleanliness of the cold-hard coil of the hot-dipped aluminum-silicon product, provided by the invention, the improvement of the surface cleanliness of the cold-hard coil of the aluminum-silicon product is realized mainly by carrying out a series of treatments on the cold-hard coil of the aluminum-silicon product in a pickling rolling process and a degreasing process. Obviously improves the surface cleanliness of the cold-hardened hot-dipped aluminum-silicon product, and the residual oil before improvement is 700mg/m 2 200mg/m of residual iron 2 The reflectivity is 45 percent, and is improved to 240mg/m of improved residual oil 2 Residual iron 45mg/m 2 And a reflectivity of 92%.
In the above technical scheme, the mass fraction of the emulsion used in the 5 th pass is different from the mass fraction of the emulsion used in the 1-4 th cold rolling: in the 5 th pass, the 5 th rack is controlled by adopting an independent emulsion box body, the emulsion is sprayed into a roll gap through a nozzle to provide lubricating and cooling functions, the concentration of the rolling oil can be mainly reduced by adopting lower mass fraction of the emulsion, and the residue of the rolling oil on the surface of a strip steel plate can be reduced by adopting the low-concentration rolling oil, so that the surface cleanliness and the strip steel reflectivity are improved.
In a preferred embodiment, the corrosion inhibitor comprises a diclozin corrosion inhibitor. Is a product of Beijing Jazz Xin Shenda science and technology development company Limited and is an organic acid corrosion inhibitor of the main component of sour taste. Specific reference may be made to:
https://max.book118.com/html/2020/0812/6052150213002230.shtm。
the mass fraction of the corrosion inhibitor is 0.3-0.5%. If the mass fraction of the corrosion inhibitor is too small, the slow release effect is not ideal; the mass fraction of the corrosion inhibitor is too large, the slow release is too fast, and the plate surface is blackened, so that the surface cleanliness is reduced;
in a preferred embodiment, the preheated corrosion inhibitor is at a temperature in the range of 85-90 deg.C (the corrosion inhibitor is added directly to the acid tank, the temperature of the acid tank is 80 deg.C, corresponding to preheating). Most corrosion inhibitors are controlled within a certain temperature range when in use, the temperature is low, so that the strip steel is not pickled, and the efficiency is reduced when the temperature is increased.
As one of the preferable embodiments, the 5 cold rolling mills used in the 5-pass cold rolling are respectively provided with at least one set of chrome plating roller in 1-4 cold rolling stands, the 5 cold rolling stands are provided with 2 sets of chrome plating rollers, the chrome plating rollers can improve the wear resistance and hardness of the rollers, reduce iron powder generated in the rolling friction process of the rollers and the strip steel, and the 5 cold rolling stands are provided with 2 sets of chrome plating rollers: in order to ensure the roughness of the No. 5 frame, 1 roller change is needed to be arranged in the middle so as to maintain the roughness.
As an alternative embodiment, the emulsion is a hengao P3-multan S emulsion. The main component is vegetable oil.
As one of the preferable embodiments, the mass fraction of the emulsion used in the 1-4 cold rolling passes is adjusted to 3-4% 3 hours before the production. In order to control the concentration of the emulsion in advance and avoid the increase of the total residual quantity on the surface of the strip steel caused by the concentration fluctuation of the emulsion caused by the adjustment in the production process.
As one of the preferable embodiments, the mass fraction of the emulsion used in the 5-pass cold rolling is adjusted to 0.7-0.9% 6 hours before production. Since the concentration of 5 passes needs to be reduced, the adjustment is started 6 hours before production, and the adjustment is expected to be completed.
In a preferred embodiment, the emulsion liquid level used in the 5-pass cold rolling is controlled to be 70-75%.
In a preferred embodiment, the degreasing conditions are as follows: the conductivity of the alkali brushing system is 20-30ms/cm, the conductivity of the electrolytic cleaning system is 60-70ms/cm, and the current of the brush roller is 20-25A. And (3) degreasing the chilled coil in a degreasing process, and improving the surface cleanliness of the chilled coil again mainly by controlling parameters such as the conductivity of an alkali scrubbing system, the conductivity of an electrolytic cleaning system, the current of a brush roller and the like.
The method for improving the surface cleanliness of the cold-hard coil of the hot-dipped aluminum-silicon product is described in detail in the following by combining the examples, comparative examples and experimental data.
Example 1
(1) The first step is as follows: optimizing the production scheduling of an acid rolling procedure: the aluminum-silicon coils are required to be collected and produced in batches, 10-40 coils of common materials are added for transition before the aluminum-silicon coils are produced, and the aluminum-silicon coils are arranged behind the outer plate of the automobile and in front of the high-strength steel.
(2) The second step is that: the method is characterized in that key points of the acid rolling process are specially controlled, the surface cleanliness of the cold-hard coil is improved, and the main process comprises the following steps: 1) Preparing a chromium plating roller according to the production capacity of each batch, preparing at least one set of chromium plating roller by using a 1-4 machine frame respectively, and preparing 2 sets of chromium plating rollers by using a 5 machine frame; 2) The corrosion inhibitor is used: heating the corrosion inhibitor in advance before pickling, wherein the concentration of the corrosion inhibitor is controlled according to 0.4%; 3) Controlling the concentration of the emulsion during cold rolling: controlling the concentration of the emulsion of the 1-4 frames according to 3.5 percent, measuring the concentration 3 hours before production, controlling oil filling and water filling when the concentration can not reach a target value, and adjusting oil filling and water filling for multiple times in small batches; 5 the concentration of the frame is controlled according to 0.8%, the detection and adjustment are carried out 6 hours in advance, the oil skimmer is normally opened, the liquid is changed during maintenance, the liquid is changed in batches during production, and the water is supplemented, and the liquid level of the emulsion is controlled according to 72%.
(3) The third step: degreasing treatment: the aluminum-silicon cold-hard coil is continuously treated in a degreasing process to improve the surface cleanliness, and the main process comprises the following steps: the conductivity of the alkali scrubbing system is 25ms/cm, the conductivity of the electrolytic cleaning system is 65ms/cm, and the current of the brush roller is 22A.
Example 2
(1) The first step is as follows: optimizing the production scheduling of an acid rolling process: the aluminum-silicon coils are required to be produced in batches, 10-40 coils of common materials are added before the aluminum-silicon coils are produced for transition, and the aluminum-silicon coils are arranged behind the automobile outer plate and in front of the high-strength steel.
(2) The second step: the method is characterized in that key points of an acid rolling process are specially controlled, the surface cleanliness of a cold hard coil is improved, and the main process comprises the following steps: 1) Preparing a chromium plating roller according to the production capacity of each batch, preparing at least one set of chromium plating roller by using 1-4 frames respectively, and preparing 2 sets of chromium plating rollers by using 5 frames; 2) The corrosion inhibitor is used: heating the corrosion inhibitor in advance before pickling, wherein the concentration of the corrosion inhibitor is controlled according to 0.3 percent; 3) Controlling the concentration of the emulsion during cold rolling: 1-4, controlling the concentration of the emulsion of the frame according to 3%, measuring the concentration 3 hours before production, controlling oil filling and water filling when the target value is not reached, and adjusting oil filling and water filling for multiple times in small batches; 5 the concentration of the frame is controlled according to 0.7 percent, the detection and adjustment are carried out 6 hours in advance, the oil skimmer is normally opened, the liquid is changed during maintenance, the liquid is changed in batches during production, and the water is supplemented, and the liquid level of the emulsion is controlled according to 70 percent.
(3) The third step: degreasing process treatment: the aluminum-silicon cold-hard coil is continuously treated in a degreasing process to improve the surface cleanliness, and the main process comprises the following steps: the conductivity of the alkali scrubbing system is 20ms/cm, the conductivity of the electrolytic cleaning system is 60ms/cm, and the current of the brush roller is 20A.
Example 3
(1) The first step is as follows: optimizing the production scheduling of an acid rolling procedure: the aluminum-silicon coils are required to be produced in batches, 10-40 coils of common materials are added before the aluminum-silicon coils are produced for transition, and the aluminum-silicon coils are arranged behind the automobile outer plate and in front of the high-strength steel.
(2) The second step: the method is characterized in that key points of the acid rolling process are specially controlled, the surface cleanliness of the cold-hard coil is improved, and the main process comprises the following steps: 1) Preparing a chromium plating roller according to the production capacity of each batch, preparing at least one set of chromium plating roller by using a 1-4 machine frame respectively, and preparing 2 sets of chromium plating rollers by using a 5 machine frame; 2) The corrosion inhibitor is used: heating the corrosion inhibitor in advance before pickling, wherein the concentration of the corrosion inhibitor is controlled according to 0.5 percent; 3) Controlling the concentration of the emulsion during cold rolling: controlling the concentration of the emulsion of the 1-4 frames according to 4%, measuring the concentration 3 hours before production, controlling oil filling and water filling when the concentration does not reach a target value, and adjusting oil filling and water filling for multiple times in small batches; 5 the concentration of the frame is controlled according to 0.9 percent, the detection and adjustment are carried out 6 hours in advance, the oil skimmer is normally opened, the liquid is changed during maintenance, the liquid is changed in batches during production and is supplemented, and the liquid level of the emulsion is controlled according to 75 percent.
(3) The third step: degreasing process treatment: the aluminum-silicon cold-hard coil is continuously treated in a degreasing process to improve the surface cleanliness, and the main process comprises the following steps: the conductivity of the alkali scrubbing system is 30ms/cm, the conductivity of the electrolytic cleaning system is 70ms/cm, and the current of the brush roller is 25A.
Comparative example 1
In this comparative example, the emulsion used in the cold rolling of 1 to 4 passes was 1% by mass, the emulsion used in the cold rolling of 5 passes was 0.4% by mass, and the rest was the same as in example 1.
Comparative example 2
In this comparative example, the emulsion used in the cold rolling of 1 to 4 passes was 6% by mass, the emulsion used in the cold rolling of 5 passes was 2% by mass, and the rest was the same as in example 1.
Comparative example 3
The mass fraction of the corrosion inhibitor in this comparative example was 0.1%, and the rest was the same as in example 1.
Comparative example 4
The mass fraction of the corrosion inhibitor in this comparative example is 1%, and the rest is the same as in example 1.
Comparative example 5
The conditions of the degreasing treatment in this comparative example were: the conductivity of the alkali scrubbing system is 10ms/cm, the conductivity of the electrolytic cleaning system is 40ms/cm, the current of the brush roller is 15A, and the rest is the same as that of the embodiment 1.
Experimental example 1
For comparison, the important parameters of each example and each comparative example are listed in table 1. The cold hard rolls obtained in each example and comparative example were subjected to measurement of residual oil, residual iron and reflectance and counted as shown in table 1.
TABLE 1
From the data in table 1 it can be seen that:
in the prior art, before the processes of examples of the present invention and comparative examples were not carried out, the residual oil was 700mg/m 2 200mg/m of residual iron 2 The reflectivity is 45%;
in comparative example 1, the mass fraction of the emulsion is less than the range of the invention, and the obtained chilled coil has high residual oil and residual iron content and low reflectivity;
in the comparative example 2, the mass fraction of the emulsion is larger than the range of the invention, and the obtained chilled coil has high residual oil and residual iron content and low reflectivity;
in the comparative example 3, the mass fraction of the corrosion inhibitor is 0.1 percent and is less than the range of the invention, and the obtained chilled coil has high residual oil and residual iron content and low reflectivity;
in the comparative example 4, the mass fraction of the corrosion inhibitor is 1 percent, which is larger than the range of the invention, and the obtained chilled coil has high residual oil and residual iron content and low reflectivity;
in comparative example 5, the condition of degreasing treatment was out of the range of the present invention, and the obtained chilled coil had a high residual iron content of residual oil and a low reflectance;
examples 1 to 3, residual oil 240 to 302mg/m 2 45-65mg/m of residual iron 2 And the reflectivity is 84-92%. Shows that: the method comprises the steps of improving residual oil by 700mg/m 2 200mg/m of residual iron 2 The reflectivity is 45 percent, and is improved to 240mg/m of improved residual oil 2 Residual iron 45mg/m 2 And a reflectivity of 92%.
After the method provided by the embodiment of the invention is adopted, the plating leakage incidence rate of the hot-dip process is reduced by 4.24%, the monthly output is 5000 tons, the difference between the output and the quality is 820 yuan/ton, and the monthly benefit is 17.38 ten thousand yuan.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
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 (10)
1. A method for improving the surface cleanliness of a cold-hard coil of a hot-dipped aluminum-silicon product is characterized by comprising the following steps:
obtaining a hot-rolled steel coil of the hot-dip aluminum-silicon product;
adding a preheated corrosion inhibitor into the hot-rolled steel coil, and then carrying out acid pickling to obtain acid-pickled strip steel;
adding the acid-washed strip steel into emulsion for 5 times of cold rolling to obtain a cold-hard coil; wherein the mass fraction of the emulsion used in the 1 st to 4 th cold rolling is 3 to 4 percent, and the mass fraction of the emulsion used in the 5 th cold rolling is 0.7 to 0.9 percent;
and degreasing the chilled coil to obtain the chilled coil with high surface cleanliness.
2. The method for improving the surface cleanliness of the cold-hard coil of the hot-dipped aluminum-silicon product according to claim 1, wherein the mass fraction of the corrosion inhibitor is 0.3-0.5%.
3. The method for improving the surface cleanliness of the cold-hard coil of the hot-dipped aluminum-silicon product according to claim 1, wherein the corrosion inhibitor is a Kincoujing corrosion inhibitor.
4. The method for improving the surface cleanliness of the chilled coil of the hot-dipped aluminum-silicon product according to claim 1, wherein the preheated corrosion inhibitor has a temperature ranging from 85 ℃ to 90 ℃.
5. The method for improving the surface cleanliness of the cold-hard coil of the hot-dipped aluminum-silicon product according to claim 1, wherein 5 cold rolling mills are used in the 5-pass cold rolling, wherein 1-4 cold rolling mills are respectively provided with at least one set of chromium plating roller, and 5 cold rolling mills are provided with 2 sets of chromium plating rollers.
6. The method for improving the surface cleanliness of the cold-hard coil of the hot-dipped aluminum-silicon product according to claim 1, wherein the emulsion is a Hangao P3-multan S emulsion.
7. The method for improving the surface cleanliness of the cold hard coil of the hot-dipped aluminum-silicon product according to claim 1, wherein the mass fraction of the emulsion used for the 1-4 cold rolling passes is adjusted to 3-4% 3 hours before production.
8. The method for improving the surface cleanliness of the cold hard coil of the hot-dipped aluminum-silicon product according to claim 1, wherein the mass fraction of the emulsion used for the 5-pass cold rolling is adjusted to 0.7-0.9% 6 hours before production.
9. The method for improving the surface cleanliness of the cold hard coil of the hot-dipped aluminum-silicon product according to claim 1, wherein the liquid level of the emulsion used in the 5-pass cold rolling is controlled to be 70-75%.
10. The method for improving the surface cleanliness of the cold hard coil of the hot-dip aluminum-silicon product according to claim 1, wherein the degreasing treatment conditions are as follows: the conductivity of the alkali brushing system is 20-30ms/cm, the conductivity of the electrolytic cleaning system is 60-70ms/cm, and the current of the brush roller is 20-25A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210689963.1A CN115228934A (en) | 2022-06-17 | 2022-06-17 | Method for improving surface cleanliness of cold-hard coil of hot-dip aluminum-silicon product |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210689963.1A CN115228934A (en) | 2022-06-17 | 2022-06-17 | Method for improving surface cleanliness of cold-hard coil of hot-dip aluminum-silicon product |
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| Publication Number | Publication Date |
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| CN115228934A true CN115228934A (en) | 2022-10-25 |
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| CN202210689963.1A Pending CN115228934A (en) | 2022-06-17 | 2022-06-17 | Method for improving surface cleanliness of cold-hard coil of hot-dip aluminum-silicon product |
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| Country | Link |
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| CN (1) | CN115228934A (en) |
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- 2022-06-17 CN CN202210689963.1A patent/CN115228934A/en active Pending
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