CN114045378A - Method for improving surface cleanliness of heat-resistant steel - Google Patents
Method for improving surface cleanliness of heat-resistant steel Download PDFInfo
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- CN114045378A CN114045378A CN202111211422.XA CN202111211422A CN114045378A CN 114045378 A CN114045378 A CN 114045378A CN 202111211422 A CN202111211422 A CN 202111211422A CN 114045378 A CN114045378 A CN 114045378A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 72
- 239000010959 steel Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000003749 cleanliness Effects 0.000 title claims abstract description 16
- 238000005554 pickling Methods 0.000 claims abstract description 37
- 239000002253 acid Substances 0.000 claims abstract description 29
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000000137 annealing Methods 0.000 claims abstract description 20
- 230000001680 brushing effect Effects 0.000 claims abstract description 15
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 13
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052742 iron Inorganic materials 0.000 claims abstract description 12
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 11
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 11
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 11
- 238000004140 cleaning Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 14
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 9
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 8
- 239000004952 Polyamide Substances 0.000 claims description 5
- 229920002647 polyamide Polymers 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000005097 cold rolling Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 abstract description 7
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000005201 scrubbing Methods 0.000 description 3
- 239000011651 chromium Substances 0.000 description 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 235000021110 pickles Nutrition 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/033—Other grinding machines or devices for grinding a surface for cleaning purposes, e.g. for descaling or for grinding off flaws in the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
-
- 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
- C21D11/00—Process control or regulation for heat treatments
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/086—Iron or steel solutions containing HF
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
- C25F1/06—Iron or steel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention relates to a method for improving the surface cleanliness of stainless steel, in particular to a method for improving the surface cleanliness of heat-resistant steel. A method for improving the cleanliness of the surface of heat-resistant steel comprises the following steps: (1) annealing, (2) brushing, (3) pickling: the steel plate annealed in the step (1) is firstly moved to an electrolytic sodium sulfate section for iron scale pre-cleaning, the required sodium sulfate density is 1.125-1.25g/cm3, the electrolytic current is 3500-7500A, the steel plate is brushed and cleaned after the step (2), then the steel strip is moved to an acid mixed by nitric acid and hydrofluoric acid for iron scale pickling, the acid concentration is 175.3-191.4g/l of nitric acid, 25.5-35.8g/l of hydrofluoric acid, and the surface oxide layer is completely removed after the pickling time of 25-36min of the electrolytic sulfuric acid section and the mixed acid section. The method for improving the cleanliness of the surface of the heat-resistant steel eliminates the defects of residual iron scale on the surface of the acid-washed 310S cold plate, incomplete brushing and the like, and enables the surface of the steel plate to be more uniform and consistent.
Description
Technical Field
The invention relates to a method for improving the surface cleanliness of stainless steel, in particular to a method for improving the surface cleanliness of heat-resistant steel.
Background
The heat-resistant steel contains high chromium and nickel contents or is added with a certain amount of silicon and aluminum alloy elements, so that the alloy steel forms a compact oxide film under the action of high temperature, wherein the nickel content of 06Cr25Ni20 (310S) is high, an austenite structure with high heat strength can be formed, the heat resistance of the heat-resistant steel can reach 700-800 ℃, the heat-resistant steel can resist oxidation, creep and fracture at high temperature, and the heat-resistant steel can resist corrosion of a certain medium.
The 310S (06Cr25Ni20) alloy has started to form golden and blue oxide films on the surface at 700 ℃, and as the heating temperature reaches a high temperature state of 1000 ℃, a dense protective black oxide film is formed on the surface. Cr in the steel is easy to form protective oxide films such as FeO & Cr2O3, FeO & Fe2O3, spinel structures (FeCr 2O4 and NiCr2O 4) and the like at high temperature, and is an important reason that 06Cr25Ni20 has good high-temperature oxidation resistance.
Because the oxide film produced on the surface of the steel plate in a high-temperature state is compact and difficult to acid-wash, the one-time washing rate on a cold rolling continuous annealing acid-wash production line is low, and the reduction of the production efficiency and the cost is seriously influenced.
Disclosure of Invention
The invention aims to solve the problems and provides a method for improving the surface cleanliness of heat-resistant steel.
The purpose of the invention is realized as follows: a method for improving the cleanliness of the surface of heat-resistant steel comprises the following steps:
(1) annealing: the steel plate is operated into a continuous annealing furnace, the total heating time is 27.5-29.3min, the temperature is raised from the step combination of 700-: the steel plate operates at the temperature of 700-900 ℃ and the heating time is 18.3-19.2min, and the steel plate operates at the temperature of 900-1100 ℃ and the heating time is 8.7-9.6 min.
(2) Brushing: brushing the surface of the steel plate with a brush roll with the brush wire diameter of 0.8-1.2mm before 8.5-16.4% of mixed acid is pressed down.
(3) Acid washing: the steel plate annealed in the step (1) is firstly moved to an electrolytic sodium sulfate section for iron scale pre-cleaning, the required sodium sulfate density is 1.125-1.25g/cm3, the electrolytic current is 3500-7500A, the steel plate is brushed and cleaned after the step (2), then the steel strip is moved to an acid mixed by nitric acid and hydrofluoric acid for iron scale pickling, the acid concentration is 175.3-191.4g/l of nitric acid, 25.5-35.8g/l of hydrofluoric acid, and the surface oxide layer is completely removed after the pickling time of 25-36min of the electrolytic sulfuric acid section and the mixed acid section.
Further, the steel plate in the step (1) is a raw material coil prepared by adopting a hot-annealing pickling unit and cold rolling.
Further, the basic material of the brush wires of the brush roll in the step (2) is polyamide, and 30% -40% of silicon carbide or aluminum oxide abrasive is added into the polyamide.
Furthermore, the number of the grinding meshes of the brush wires of the brush roller in the step (2) is 80# -240#, and the brush wire density is 2000-.
The invention has the beneficial effects that: the method for improving the cleanliness of the surface of the heat-resistant steel eliminates the defects of residual iron scale on the surface of the pickled 310S cold plate, incomplete brushing and the like, so that the surfaces of the steel plates are more uniform, the one-time wire passing qualification rate of the cold plate of the heat-resistant steel 310S stainless steel is improved, the repeated steel passing amount in the production process is reduced, the enterprise cost is reduced, and the final use requirements of users are met.
Detailed Description
According to the method, researches are carried out on the aspects of controlling the thickness of the oxidation layer in the continuous annealing heating furnace, controlling the pickling parameters and optimizing the scrubbing process, so that the pickled surface is uniform and consistent, the problem that the once pickled steel plate is unqualified is solved, the repeated line passing cost of an enterprise is reduced, and the yield is improved.
(1) Annealing temperature and time control
Because the control methods of annealing furnaces of different steel types and specifications are different, the furnace temperature is set according to the production rhythm in the furnace temperature setting process, and the heating time and temperature when the steel plate passes through are reduced to reduce the thickness of an oxide layer.
The invention requires a total heating time of 27.5-29.3 min. The surface oxide layer of the steel coil heated by the step combination of 700 plus 1100 ℃ is removed after pickling, the invention requires that the steel plate runs in a continuous annealing furnace for 18.3-19.2min at 800 ℃ and 8.7-9.6min at 900 plus 1100 ℃, and the oxide layer formed on the surface after heating and annealing in the range can be removed by subsequent pickling processing.
(2) Scrubbing process
The stainless steel surface brush roller is made of polyamide as basic material and 30-40% silicon carbide or alumina abrasive is added. The diameter phi of the brush wire is mainly 0.8mm, 1.0mm, 1.2mm and the like, and is selected according to the type of defects to be removed from the surface and the roughness to be achieved.
Because the surface quality requirement of the 310S cold plate is high, the pickling thinning amount is small, the silicon carbide coarse-grain bristles are easy to generate steel plate scratches as 1.0mm and 1.2mm, and cannot disappear after pickling, and the secondary defects such as the brush hair scratches generated during brushing can be avoided while the pickling efficiency is improved by selecting and brushing the 0.8mm silicon carbide fine-grain bristles.
The brush roll before using the mixed acid pickling in order to promote pickling efficiency in cold plate pickling process, through increasing the scrubbing motor draft and reaching 8.5% -16.4% to promote the grinding and brushing dynamics of carborundum hard nylon brush roll to the steel sheet, make the steel sheet after the brush grinding can more complete clear away the electrolysis sodium sulfate pickling after the residue, can promote the effective pickling area that the acidizing fluid immerges the steel sheet surface during mixed acid pickling like this, through acid liquor and belted steel contact surface area promote pickling efficiency and reach final surface quality during the increase pickling.
(3) Acid pickling process
In the connection production process of different steel grades, when the chromium-nickel stainless steel with relatively low pickling concentration is pickled with the nitric acid and the hydrofluoric acid in a ratio of 310S (06Cr25Ni20), the oxide scales on the surface of the steel plate can be incompletely cleaned. According to the method, tests show that the pickling concentration and the ratio of the mixed acid have important influence on the production and cleaning process of the heat-resistant steel 310S, and the surface oxide layer is completely removed after the pickling time of 25-30min in the electrolytic sulfuric acid section and the mixed acid section by controlling the nitric acid concentration of 2175.3-191.4g/l and the hydrofluoric acid concentration of 25.5-35.8 g/l.
Specific examples of the method for improving the surface cleanliness of the heat-resistant steel 310S are described in detail below with reference to examples, but the specific implementation process is not limited to the examples described below.
Example one
A coil of steel plate was produced at 310S with a thickness by width specification of 2.0mm by 1219 mm.
(1) Annealing: the 310S steel plate is operated in a continuous annealing furnace, the total heating time is 27.8min, the temperature is raised from 700-: the steel plate operates at 800 ℃ for 18.5min, and the steel plate operates at 900-1100 ℃ for 8.9 min.
(2) Brushing: brushing the surface of the steel plate with a brush roll made of silicon carbide and having a brush wire diameter of 0.8mm before mixed acid with a rolling reduction of 12.5%.
(3) Acid washing: and (2) running the steel plate annealed in the step (1) to an electrolytic sodium sulfate section for iron scale pre-cleaning, wherein the density of sodium sulfate is required to be 1.22g/cm3, the electrolytic current is 5000A, then, performing brushing cleaning after the step (2), then, running the steel strip to an acid mixed by nitric acid and hydrofluoric acid for iron scale pickling, wherein the acid concentration is 180.2g/l of nitric acid and 28.1g/l of hydrofluoric acid, and completely removing the surface oxide layer after the pickling time of 25-36min in the electrolytic sulfuric acid section and the mixed acid section.
And after annealing and pickling, the surface of the steel plate is visually inspected, and the surface color is uniform and consistent.
Example two
A coil of steel plate was produced at 310S with a thickness by width specification of 2.5mm by 1219 mm.
(1) Annealing: the 310S steel plate is operated in a continuous annealing furnace, the total heating time is 27.8min, the temperature is raised from 700-: the steel plate operates at 800 ℃ for 19.0min, and the steel plate operates at 900-1100 ℃ for 9.2 min.
(2) Brushing: brushing the surface of the steel plate with a brush roll made of silicon carbide and having a brush wire diameter of 0.8mm before mixed acid with a rolling reduction of 12.5%.
(3) Acid washing: and (2) running the steel plate annealed in the step (1) to an electrolytic sodium sulfate section for iron scale pre-cleaning, wherein the density of sodium sulfate is required to be 1.25g/cm3, the electrolytic current is 5500A, then, conducting brush cleaning after the step (2), then, running the steel strip to an acid mixed by nitric acid and hydrofluoric acid for iron scale pickling, wherein the acid concentration is 185.5g/l of nitric acid and 28.5g/l of hydrofluoric acid, and completely removing the surface oxide layer after the pickling time of 25-36min in the electrolytic sulfuric acid section and the mixed acid section.
And after annealing and pickling, the surface of the steel plate is visually inspected, and the surface color is uniform and consistent.
The austenitic heat-resistant stainless steel 310S (06Cr25Ni20) is dense in an oxide layer formed on the surface after continuous annealing of a stainless steel cold plate and difficult to pickle. According to the method, through researching the relation between the factors influencing the formation of the surface oxide layer and the control of the pickling factors, the step combination heating at the temperature of 700-1100 ℃ is carried out under the condition that the heating temperature is controlled, the heating time is 27.5-29.3min, the concentration of pickling nitric acid is 175.3-191.4g/l, the concentration of hydrofluoric acid reaches 25.5g/l, the pickling time is 25-30min, and then a silicon carbide brush roller with the fineness of 0.8mm is pressed down to improve the pickling efficiency, so that the uniform and consistent surface quality requirements of the qualified steel plates are met.
The above description is only an embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.
Claims (4)
1. A method for improving the surface cleanliness of heat-resistant steel is characterized by comprising the following steps: the method comprises the following steps:
(1) annealing: the steel plate is operated into a continuous annealing furnace, the total heating time is 27.5-29.3min, the temperature is raised from the step combination of 700-: the steel plate operates at the temperature of 700-900 ℃ for 18.3-19.2min, and the steel plate operates at the temperature of 900-1100 ℃ for 8.7-9.6 min;
(2) brushing: brushing the surface of the steel plate with a brush roll with the brush wire diameter of 0.8-1.2mm before 8.5-16.4% of mixed acid is pressed down;
(3) acid washing: the steel plate annealed in the step (1) is firstly moved to an electrolytic sodium sulfate section for iron scale pre-cleaning, the required sodium sulfate density is 1.125-1.25g/cm3, the electrolytic current is 3500-7500A, the steel plate is brushed and cleaned after the step (2), then the steel strip is moved to an acid mixed by nitric acid and hydrofluoric acid for iron scale pickling, the acid concentration is 175.3-191.4g/l of nitric acid, 25.5-35.8g/l of hydrofluoric acid, and the surface oxide layer is completely removed after the pickling time of 25-36min of the electrolytic sulfuric acid section and the mixed acid section.
2. The method for improving the cleanliness of the surface of the heat-resistant steel according to claim 1, wherein the method comprises the following steps: the steel plate in the step (1) is a raw material coil prepared by adopting a hot-annealing pickling unit and cold rolling.
3. The method for improving the cleanliness of the surface of the heat-resistant steel according to claim 1, wherein the method comprises the following steps: the basic material of the brush wires of the brush roller in the step (2) is polyamide, and 30-40% of silicon carbide or aluminum oxide abrasive is added into the polyamide.
4. The method for improving the cleanliness of the surface of the heat-resistant steel according to claim 1, wherein the method comprises the following steps: the grinding mesh number of the brush wires of the brush roller in the step (2) is 80# -240#, and the brush wire density is 2000-.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115094506A (en) * | 2022-06-13 | 2022-09-23 | 山西太钢不锈钢股份有限公司 | Method for improving surface quality of cold-rolled coil |
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| JP2000073192A (en) * | 1998-08-26 | 2000-03-07 | Kawasaki Steel Corp | Production of ferritic stainless steel sheet |
| JP2003286592A (en) * | 2002-03-29 | 2003-10-10 | Sumitomo Metal Ind Ltd | Pickling process for stainless steel strip |
| CN102925904A (en) * | 2012-11-30 | 2013-02-13 | 张家港浦项不锈钢有限公司 | Thermal annealing acid-washing method of stainless steel wide and thick plate coil |
| CN105586600A (en) * | 2016-03-16 | 2016-05-18 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Duplex stainless steel cold rolling annealing and pickling process |
| CN107142513A (en) * | 2017-05-09 | 2017-09-08 | 张家港浦项不锈钢有限公司 | High chrome high-nickel stainless-steel cold-rolling annealing and pickling technique |
| CN108977874A (en) * | 2018-09-18 | 2018-12-11 | 张家港浦项不锈钢有限公司 | A kind of two phase stainless steel annealing and pickling method |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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