CN113621908A - Manufacturing process and method of hot-dip metal steel strip - Google Patents
Manufacturing process and method of hot-dip metal steel strip Download PDFInfo
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- CN113621908A CN113621908A CN202110764763.3A CN202110764763A CN113621908A CN 113621908 A CN113621908 A CN 113621908A CN 202110764763 A CN202110764763 A CN 202110764763A CN 113621908 A CN113621908 A CN 113621908A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 80
- 239000010959 steel Substances 0.000 title claims abstract description 80
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 21
- 239000002184 metal Substances 0.000 title claims abstract description 21
- 238000002161 passivation Methods 0.000 claims abstract description 53
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000011701 zinc Substances 0.000 claims abstract description 35
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 238000005246 galvanizing Methods 0.000 claims abstract description 16
- 230000009467 reduction Effects 0.000 claims abstract description 16
- 238000004804 winding Methods 0.000 claims abstract description 10
- 239000010960 cold rolled steel Substances 0.000 claims abstract description 8
- 230000008859 change Effects 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract 2
- 230000008569 process Effects 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000010008 shearing Methods 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 238000000861 blow drying Methods 0.000 claims description 3
- 238000005282 brightening Methods 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000001953 recrystallisation Methods 0.000 claims description 3
- 238000011946 reduction process Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 abstract description 8
- 238000000576 coating method Methods 0.000 abstract description 8
- 239000000047 product Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 230000003647 oxidation Effects 0.000 abstract description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 5
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 3
- 239000013589 supplement Substances 0.000 abstract description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 3
- 239000008397 galvanized steel Substances 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 238000003618 dip coating Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/24—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Treatment Of Metals (AREA)
- Coating With Molten Metal (AREA)
Abstract
The invention discloses a manufacturing process and a method of a hot-dip metal steel strip, wherein the manufacturing process of the hot-dip metal steel strip comprises the following steps of; s1: pretreatment of a cold-rolled steel strip coil; s2: preheating reduction treatment, namely preheating the mixture to 560-630 ℃ in a preheating furnace and then entering a reducing furnace to continue heating to 750-780 ℃; s3: performing galvanizing treatment, namely cooling the product, and then feeding the product into a galvanizing pot through a furnace nose for galvanizing; s4: passivating; s5: and (6) winding treatment. According to the manufacturing process and the method of the hot-dip metal steel strip, the atmosphere in the preheating furnace is set to be reducibility and weak oxidizability, so that the condition that an oxide film formed in the steel strip in the oxidation furnace is too thick can be avoided, the reduction load is reduced, the temperature of the steel strip discharged from the preheating furnace is set to be 560-630 ℃, the heat load of the reduction furnace is reduced, meanwhile, the quantitative supplement of a reagent is carried out by observing the color change of a passivation solution, the passivation effect of the passivation solution is maintained, and the adhesiveness of a zinc coating can be effectively improved.
Description
Technical Field
The invention relates to the field of steel strip hot process, in particular to a manufacturing process and a method of a hot-dip metal steel strip.
Background
The continuous hot galvanizing of steel strip is to hot dip galvanize cold rolled (hot rolled) steel strip (coil) on a continuous production line, and the steel strip (coil) is generally produced by a series of procedures of uncoiling, shearing, welding, alkali or electrolytic cleaning, inlet loop stock, heating annealing and reduction, hot dip galvanization, air knife thickness control, coating spangle or alloying treatment cooling, finishing and straightening passivation, outlet loop stock, oil coating, coiling or shearing and the like. When a hot-dip galvanized steel strip (coil) is used as a product, it is called a hot-dip galvanized steel sheet. The hot-dip galvanized steel sheet has the advantages of ideal comprehensive performances of corrosion resistance, forming, coating and the like, low cost, good appearance and the like, is mainly applied to the industries of buildings, automobiles and household appliances, and is one of the fastest-developing steel products in the last ten years.
The existing majority of the production lines adopt the Sendzimir method for the continuous hot galvanizing production of the steel strip, which is a production line formed by combining a production line for bright annealing of the cold-rolled steel strip and a hot galvanizing pot, wherein the hot galvanizing treatment process has some defects, and an oxide film formed in an oxidation furnace by the steel strip is too thick, so that the burden of a reduction furnace is increased, and the oxide film on the surface of the steel strip cannot be completely reduced to reduce the quality of a galvanized layer; the temperature of the preheated steel strip in the oxidation furnace is lower (below 450 ℃), and the heat load of the reduction furnace is also increased; in the passivation process, after the passivation solution works for a period of time, the internal components of the passivation solution change, the passivation effect is influenced, and the adhesiveness of a zinc coating is further reduced, so that a manufacturing process and a method of a hot-dip metal steel strip are provided for solving the problem.
Disclosure of Invention
The invention mainly aims to provide a manufacturing process and a method of a hot-dip metal steel strip, which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
the manufacturing process of the hot-dip metal steel strip comprises the following steps of;
s1: the method comprises the following steps of (1) pre-treating a cold-rolled steel strip plate coil, and sequentially carrying out straightening, shearing, clamping and welding treatment;
s2: preheating reduction treatment, preheating to 560-630 ℃ in a preheating furnace, then entering a reducing furnace to continue heating to 750-780 ℃,
s3: galvanizing treatment, namely, cooling the product of the preheating reduction process in a cooling section to a temperature slightly higher than that of a zinc pot, and then feeding the product into the zinc pot through a furnace nose for galvanizing;
s4: passivating, namely putting the steel strip into a chromate passivating tank for passivating;
s5: and (4) winding treatment, namely winding the steel coil into a steel coil through a winding machine.
Preferably, in step S2, the preheating furnace is integrally connected to the reducing furnace through a sealed and narrow passage.
Preferably, in the step S2, the preheating furnace is heated to 560-.
Preferably, in the step S3, the temperature of the steel strip after being cooled is 25 to 30 ℃ higher than the temperature of the zinc pot, and then the steel strip is introduced into the zinc pot for galvanizing.
Preferably, in the step S4, when the passivation solution is disposed in the passivation tank, the steps are as follows
S41, injecting water with 60% of the required volume into the passivation tank,
s42, sequentially adding the main passivation solution, the film forming agent and the brightener into the passivation tank according to the calculated amount, slightly stirring, finally supplementing the water level to the required volume, and simultaneously raising the temperature of the passivation solution to 45-55 ℃, and uniformly stirring;
s43: finally, a small zinc plate is placed in the passivation solution for about 20min, and the steel belt can be passivated when a certain amount of trivalent chromium is produced.
Preferably, in the step S42, 70-80ml of the main passivation solution, 30-40ml of the film forming agent and 20-30ml of the brightening agent are added into each liter of water.
Preferably, in S43, when the steel strip is passivated with the chromate passivation solution, the components change after a period of operation, and when the color of the passivation film becomes light, green, and blue, 3 to 5ml of the passivation solution should be supplemented, and when the passivation film is reddish purple, 2 to 3ml of the film-forming agent should be supplemented.
An operation method of a manufacturing process of a hot-dip metal steel strip comprises the following steps:
s81: after passing through an uncoiler straightener, a double-layer shearing machine, a pinch roll and a welding machine, a cold-rolled steel strip coil enters a horizontal loop through a tension roll;
s82: then, the steel plate enters a preheating furnace after the tension is adjusted by a No. 1 deviation controller, a No. 2 tension roller and a dancing roller, the rolled oil on the surface is removed, the steel plate is preheated to 560-plus-material temperature of 630 ℃, then the steel plate passes through a channel to enter a reduction furnace to be continuously heated to 750-plus-material temperature of 780 ℃, recrystallization annealing is carried out, and the steel plate is reduced into pure iron by introduced protective gas;
s83: then the steel strip enters a cooling section to be cooled to a temperature slightly higher than the temperature of a zinc pot by 25-30 ℃, enters the zinc pot through a furnace nose to be galvanized, bypasses a sinking direction in the zinc pot, vertically rises, passes through a stabilizing roller, is taken out of the pot, is blown and wiped by an air knife to control the thickness of a zinc layer, and enters a chromate passivation tank through a spangle control machine, a vertical cooling air box, a No. 2 deviation controller, a horizontal cooling air box, a steering roller, a No. 2 tension roller, a finishing machine, a stretch bending straightener or a multi-roller straightener;
s84: the zinc layer is passivated, dried by a squeezing roller and a hot air blow-drying machine, and then enters a coiling machine through an outlet loop, a No. 4 tension roller, a slitting and cutting machine and an oiling device to be coiled into a steel coil.
Compared with the prior art, the invention has the following beneficial effects:
the improved hot-dip process for the steel strip has the advantages that the atmosphere in the preheating furnace is set to be reducing and weak oxidizing, the condition that an oxide film formed in the steel strip in the oxidation furnace is too thick can be avoided, the reduction load is reduced, the temperature of the steel strip out of the preheating furnace is set to be 560-630 ℃, the heat load of the reduction furnace is reduced, meanwhile, quantitative supplement of reagents is carried out by observing the color change of the passivation solution, the passivation effect of the passivation solution is maintained, and the adhesiveness of a zinc coating can be effectively improved.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The manufacturing process of the hot-dip metal steel strip comprises the following steps of;
s1: the method comprises the following steps of (1) pre-treating a cold-rolled steel strip plate coil, and sequentially carrying out straightening, shearing, clamping and welding treatment;
s2: preheating reduction treatment, preheating to 560-630 ℃ in a preheating furnace, then entering a reducing furnace to continue heating to 750-780 ℃,
s3: galvanizing treatment, namely, cooling the product of the preheating reduction process in a cooling section to a temperature slightly higher than that of a zinc pot, and then feeding the product into the zinc pot through a furnace nose for galvanizing;
s4: passivating, namely putting the steel strip into a chromate passivating tank for passivating;
s5: and (4) winding treatment, namely winding the steel coil into a steel coil through a winding machine.
In the step S2, the preheating furnace is integrally connected to the reducing furnace through a sealed and narrow passage, so that the high-temperature steel strip processed by the preheating furnace can enter the reducing annealing furnace under a sealed condition without being oxidized and cooled by air and enter the reducing furnace at a higher temperature without the combustion exhaust gas entering the reducing furnace.
In the step S2, the preheating furnace is heated to 560-.
In the step S3, the temperature of the cooled steel strip is 25-30 ℃ higher than the temperature of the zinc pot, and then the steel strip is introduced into the zinc pot for galvanizing.
In the step S4, when the passivation solution is disposed in the passivation tank, the steps are as follows
S41, injecting water with 60% of the required volume into the passivation tank,
s42, sequentially adding the main passivation solution, the film forming agent and the brightener into the passivation tank according to the calculated amount, slightly stirring, finally supplementing the water level to the required volume, and simultaneously raising the temperature of the passivation solution to 45-55 ℃, and uniformly stirring;
s43: finally, a small zinc plate is placed in the passivation solution for about 20min, and the steel belt can be passivated when a certain amount of trivalent chromium is produced.
In the step S42, 70-80ml of main passivation solution, 30-40ml of film forming agent and 20-30ml of brightening agent are added into each liter of water.
In the step S43, when the steel strip is passivated by using the chromate passivation solution, the components change after working for a period of time, when the color of the passivation film becomes light, green and blue, 3-5ml of the passivation solution should be supplemented, and when the passivation film is reddish purple, 2-3ml of the film forming agent should be supplemented.
An operation method of a manufacturing process of a hot-dip metal steel strip comprises the following steps:
s81: after passing through an uncoiler straightener, a double-layer shearing machine, a pinch roll and a welding machine, a cold-rolled steel strip coil enters a horizontal loop through a tension roll;
s82: then, the steel plate enters a preheating furnace after the tension is adjusted by a No. 1 deviation controller, a No. 2 tension roller and a dancing roller, the rolled oil on the surface is removed, the steel plate is preheated to 560-plus-material temperature of 630 ℃, then the steel plate passes through a channel to enter a reduction furnace to be continuously heated to 750-plus-material temperature of 780 ℃, recrystallization annealing is carried out, and the steel plate is reduced into pure iron by introduced protective gas;
s83: then the steel strip enters a cooling section to be cooled to a temperature slightly higher than the temperature of a zinc pot by 25-30 ℃, enters the zinc pot through a furnace nose to be galvanized, bypasses a sinking direction in the zinc pot, vertically rises, passes through a stabilizing roller, is taken out of the pot, is blown and wiped by an air knife to control the thickness of a zinc layer, and enters a chromate passivation tank through a spangle control machine, a vertical cooling air box, a No. 2 deviation controller, a horizontal cooling air box, a steering roller, a No. 2 tension roller, a finishing machine, a stretch bending straightener or a multi-roller straightener;
s84: the zinc layer is passivated, dried by a squeezing roller and a hot air blow-drying machine, and then enters a coiling machine through an outlet loop, a No. 4 tension roller, a slitting and cutting machine and an oiling device to be coiled into a steel coil.
Contrast table after steel strip hot-dip coating process improvement
| Item | Traditional hot-dip technology | Improved hot-dip coating process |
| Preheating the atmosphere in the furnace | Oxidability | Reducing and weakly oxidizing |
| temperature/deg.C of the preheating furnace when the steel strip is taken out | 350-450 | 560-630 |
| Adhesion of zinc coating | Is poor | Good effect |
The improved hot-dip process for the steel strip has the advantages that the atmosphere in the preheating furnace is set to be reducing and weak oxidizing, the condition that an oxide film formed in the steel strip in the oxidation furnace is too thick can be avoided, the reduction load is reduced, the temperature of the steel strip out of the preheating furnace is set to be 560-630 ℃, the heat load of the reduction furnace is reduced, meanwhile, quantitative supplement of reagents is carried out by observing the color change of the passivation solution, the passivation effect of the passivation solution is maintained, and the adhesiveness of a zinc coating can be effectively improved.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A manufacturing process of a hot-dip metal steel strip is characterized by comprising the following steps: the manufacturing process of the hot-dip metal steel strip comprises the following steps of;
s1: the method comprises the following steps of (1) pre-treating a cold-rolled steel strip plate coil, and sequentially carrying out straightening, shearing, clamping and welding treatment;
s2: preheating reduction treatment, namely preheating the mixture to 560-630 ℃ in a preheating furnace and then entering a reducing furnace to continue heating to 750-780 ℃;
s3: galvanizing treatment, namely, cooling the product of the preheating reduction process in a cooling section to a temperature slightly higher than that of a zinc pot, and then feeding the product into the zinc pot through a furnace nose for galvanizing;
s4: passivating, namely putting the steel strip into a chromate passivating tank for passivating;
s5: and (4) winding treatment, namely winding the steel coil into a steel coil through a winding machine.
2. The process for manufacturing a hot-dip metal coated steel strip as claimed in claim 1, wherein: in step S2, the preheating furnace is connected to the reducing furnace through a sealed and narrow passage to form a whole.
3. The process for manufacturing a hot-dip metal coated steel strip as claimed in claim 1, wherein: in the step S2, the preheating furnace is heated to 560-.
4. The process for manufacturing a hot-dip metal coated steel strip as claimed in claim 1, wherein: in the step S3, the temperature of the cooled steel strip is 25-30 ℃ higher than the temperature of the zinc pot, and then the steel strip is introduced into the zinc pot for galvanizing.
5. The process for manufacturing a hot-dip metal coated steel strip as claimed in claim 1, wherein: in the step S4, when the passivation solution is disposed in the passivation tank, the steps are as follows
S41, injecting water with 60% of the required volume into the passivation tank,
s42, sequentially adding the main passivation solution, the film forming agent and the brightener into the passivation tank according to the calculated amount, slightly stirring, finally supplementing the water level to the required volume, and simultaneously raising the temperature of the passivation solution to 45-55 ℃, and uniformly stirring;
s43: finally, a small zinc plate is placed in the passivation solution for about 20min, and the steel belt can be passivated when a certain amount of trivalent chromium is produced.
6. The process for producing a hot-dip metal coated steel strip as claimed in claim 5, wherein: in the step S42, 70-80ml of main passivation solution, 30-40ml of film forming agent and 20-30ml of brightening agent are added into each liter of water.
7. The process for producing a hot-dip metal coated steel strip as claimed in claim 5, wherein: in the step S43, when the steel strip is passivated by using the chromate passivation solution, the components change after working for a period of time, when the color of the passivation film becomes light, green and blue, 3-5ml of the passivation solution should be supplemented, and when the passivation film is reddish purple, 2-3ml of the film forming agent should be supplemented.
8. The method of operating a process for manufacturing a hot-dip coated metal steel strip as claimed in claim 1, wherein: the operation method comprises the following steps:
s81: after passing through an uncoiler straightener, a double-layer shearing machine, a pinch roll and a welding machine, a cold-rolled steel strip coil enters a horizontal loop through a tension roll;
s82: then, the steel plate enters a preheating furnace after the tension is adjusted by a No. 1 deviation controller, a No. 2 tension roller and a dancing roller, the rolled oil on the surface is removed, the steel plate is preheated to 560-plus-material temperature of 630 ℃, then the steel plate passes through a channel to enter a reduction furnace to be continuously heated to 750-plus-material temperature of 780 ℃, recrystallization annealing is carried out, and the steel plate is reduced into pure iron by introduced protective gas;
s83: then the steel strip enters a cooling section to be cooled to a temperature slightly higher than the temperature of a zinc pot by 25-30 ℃, enters the zinc pot through a furnace nose to be galvanized, bypasses a sinking direction in the zinc pot, vertically rises, passes through a stabilizing roller, is taken out of the pot, is blown and wiped by an air knife to control the thickness of a zinc layer, and enters a chromate passivation tank through a spangle control machine, a vertical cooling air box, a No. 2 deviation controller, a horizontal cooling air box, a steering roller, a No. 2 tension roller, a finishing machine, a stretch bending straightener or a multi-roller straightener;
s84: the zinc layer is passivated, dried by a squeezing roller and a hot air blow-drying machine, and then enters a coiling machine through an outlet loop, a No. 4 tension roller, a slitting and cutting machine and an oiling device to be coiled into a steel coil.
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| CN202110764763.3A CN113621908A (en) | 2021-07-06 | 2021-07-06 | Manufacturing process and method of hot-dip metal steel strip |
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| CN202110764763.3A CN113621908A (en) | 2021-07-06 | 2021-07-06 | Manufacturing process and method of hot-dip metal steel strip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115404329A (en) * | 2022-08-24 | 2022-11-29 | 北冶功能材料(江苏)有限公司 | Silicon steel strip and preparation method thereof |
| CN116103596A (en) * | 2023-04-04 | 2023-05-12 | 天津市宇润德金属制品有限公司 | Production process for coating steel coil |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20040177903A1 (en) * | 2003-03-12 | 2004-09-16 | Stein Heurtey | Process for the controlled oxidation of a strip before continuous galvanizing, and galvanizing line |
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| CN104368660A (en) * | 2014-10-18 | 2015-02-25 | 江苏江南冷轧薄板有限公司 | Continuous galvanizing flat knurling process |
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| CN116103596A (en) * | 2023-04-04 | 2023-05-12 | 天津市宇润德金属制品有限公司 | Production process for coating steel coil |
| CN116103596B (en) * | 2023-04-04 | 2023-07-07 | 天津市宇润德金属制品有限公司 | Production process for coating steel coil |
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Application publication date: 20211109 |