CN111659748A - Hot-rolled substrate zinc-based coated plate strip production unit and production process - Google Patents
Hot-rolled substrate zinc-based coated plate strip production unit and production process Download PDFInfo
- Publication number
- CN111659748A CN111659748A CN202010538016.3A CN202010538016A CN111659748A CN 111659748 A CN111659748 A CN 111659748A CN 202010538016 A CN202010538016 A CN 202010538016A CN 111659748 A CN111659748 A CN 111659748A
- Authority
- CN
- China
- Prior art keywords
- section
- strip
- hot
- enters
- rolled
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 75
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 239000011701 zinc Substances 0.000 title claims abstract description 50
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 50
- 239000000758 substrate Substances 0.000 title claims abstract description 49
- 238000004148 unit process Methods 0.000 title description 2
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 109
- 239000010959 steel Substances 0.000 claims abstract description 109
- 238000000576 coating method Methods 0.000 claims abstract description 85
- 239000011248 coating agent Substances 0.000 claims abstract description 84
- 238000000137 annealing Methods 0.000 claims abstract description 47
- 238000001816 cooling Methods 0.000 claims abstract description 43
- 238000005240 physical vapour deposition Methods 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 37
- 238000005246 galvanizing Methods 0.000 claims abstract description 34
- 239000000126 substance Substances 0.000 claims abstract description 24
- PGTXKIZLOWULDJ-UHFFFAOYSA-N [Mg].[Zn] Chemical compound [Mg].[Zn] PGTXKIZLOWULDJ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910000861 Mg alloy Inorganic materials 0.000 claims abstract description 16
- 238000007747 plating Methods 0.000 claims abstract description 15
- 229910000640 Fe alloy Inorganic materials 0.000 claims abstract description 14
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000004570 mortar (masonry) Substances 0.000 claims description 16
- 238000005275 alloying Methods 0.000 claims description 12
- 238000002161 passivation Methods 0.000 claims description 12
- 238000005422 blasting Methods 0.000 claims description 11
- 238000001771 vacuum deposition Methods 0.000 claims description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 239000011777 magnesium Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005566 electron beam evaporation Methods 0.000 claims description 2
- 238000005098 hot rolling Methods 0.000 claims description 2
- 238000007733 ion plating Methods 0.000 claims description 2
- 238000001755 magnetron sputter deposition Methods 0.000 claims description 2
- 238000007738 vacuum evaporation Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract 3
- 239000000243 solution Substances 0.000 description 12
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000005554 pickling Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 3
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
-
- 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
-
- 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
- B21B2001/225—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 by hot-rolling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Coating With Molten Metal (AREA)
Abstract
The invention belongs to the field of deep processing of steel strips, and relates to a hot-rolled substrate zinc-based coating plate strip production unit and a production process, wherein the unit comprises: the device comprises an inlet section, an inlet loop, a descaling section, a first steering roller, a heating section, a hot galvanizing section, an air knife, a cooling section after plating, a Physical Vapor Deposition (PVD) continuous coating section, an annealing section, a cooling section, a fourth steering roller, a finishing section, a straightening and pulling section, a chemical treatment section, an outlet loop and an outlet section; the device also comprises a second steering roller and a third steering roller which are connected in parallel between the first steering roller and the fourth steering roller. The production line can be used for producing hot-rolled substrate zinc-magnesium alloy coating plate strips, hot-rolled substrate zinc-plating plate strips, hot-rolled substrate zinc-iron alloy coating plate strips, hot-rolled descaler plate strips and other products. The invention combines the green surface descaling technology, the hot galvanizing technology and the PVD continuous coating technology, and has the characteristics of green environmental protection, flexible process, abundant products and the like.
Description
Technical Field
The invention belongs to the field of deep processing of steel strips, and relates to a hot-rolled substrate zinc-based coating plate strip production unit and a production process.
Background
The hot-rolled galvanized sheet is directly galvanized after acid pickling by taking the hot-rolled sheet as a substrate, compared with the traditional galvanized sheet, the hot-rolled galvanized sheet has the advantages that the cold-rolling process is omitted, the strip steel is not hardened by cold rolling, the recrystallization annealing treatment is not needed in a galvanizing unit, the annealing temperature is lower compared with that of a cold-rolled hot-galvanized product, and therefore, the cost is greatly lower than that of the cold-rolled strip steel with the same specification. In recent years, with the rise of steel structure industry and the development of highway and railway industry, hot-rolled galvanized plates have good development prospects in the industries of construction, automobile manufacturing, steel plate bin manufacturing, railway passenger car manufacturing, highway guardrail plate manufacturing and the like.
The prior zinc-magnesium coating steel plate strip production has the following defects: 1) acid-containing wastewater and waste gas are generated in the pickling process of the hot-dip plated strip, so that the environment is polluted; 2) the single-sheet plate galvanizing production efficiency is low; 3) the thickness requirement of a zinc layer in part of industries is high (for example, the thickness of the zinc layer required by a highway guardrail is as high as 600g/m2), and the continuous galvanizing unit is difficult to realize the large-thickness zinc layer coating; 4) acid washing and galvanization are independent production, the unit occupies large area and has more personnel, and simultaneously, steel coils also need to be transferred among different units and are repeatedly coiled and uncoiled; 5) after pickling, the surface of the strip steel needs to be oiled in order to prevent the strip steel from being oxidized, and the strip steel needs to be cleaned before galvanization.
The zinc-magnesium alloy coating is used as an upgraded coating material, the corrosion resistance of the zinc-magnesium alloy coating can reach more than 23 times of that of a pure zinc coating, the formability, the weldability, the coating property and the hardness of the coating are superior to those of a zinc coating, the development trend of 'thin zinc coating and high corrosion resistance' of a steel coating is met, and the zinc-magnesium alloy coating has a good application prospect.
Disclosure of Invention
In view of the above, the invention aims to provide a hot-rolled substrate zinc-based coated plate strip production unit and a production process, which are used for solving the problems of product quality, process flexibility, environmental pollution and the like in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a hot-rolled substrate zinc-based coating plate strip production unit is characterized by comprising an inlet section, an inlet loop, a descaling section, a first steering roller, a heating section, a hot galvanizing section, an air knife, a cooling section after plating, a PVD (physical vapor deposition) continuous coating section, an annealing section, a cooling section, a fourth steering roller, a finishing section, a straightening and withdrawal section, a chemical treatment section, an outlet loop and an outlet section which are sequentially connected; the device also comprises a second steering roller and a third steering roller which are connected in parallel between the first steering roller and the fourth steering roller.
Optionally, the PVD continuous coating section comprises an inlet multistage differential pressure chamber, a plasma cleaning chamber, a heating chamber, a vacuum deposition chamber, and an outlet multistage differential pressure chamber, which are arranged in sequence.
Optionally, the descaling section is descaled by using a shot blasting machine, an abrasive and water are mixed to prepare mortar, and the mortar is thrown to the surface of the hot rolled steel plate by using the shot blasting machine to remove an oxide layer.
Optionally, the heating section is a horizontal furnace or a vertical furnace, and the heating temperature of the steel strip in the heating section is 450 DEG C
～480℃。
Optionally, the annealing section is a horizontal furnace or a vertical furnace, and the maximum heating temperature of the steel strip in the annealing section is 600 ℃.
Optionally, the finishing section adopts one of a 2-roll finishing machine, a 4-roll finishing machine and a 6-roll finishing machine.
A hot-rolled substrate zinc-based coating plate strip production process adopts the hot-rolled substrate zinc-based coating plate strip production unit, and comprises a hot-rolled substrate zinc-magnesium alloy coating plate strip production process, a hot-rolled substrate zinc-based coating plate strip production process, a hot-rolled substrate zinc-iron alloy coating plate strip production process and a hot-rolled descaling plate strip production process;
in the production process of the hot-rolled substrate zinc-magnesium alloy coating plate strip, the hot-rolled plate strip enters a descaling section from an inlet section through an inlet loop to be descaled; the descaled strip enters a heating section through a first steering roller, the strip is heated to a certain temperature and then enters a zinc pot for galvanizing, the strip is blown by an air knife after galvanizing, and then enters a post-galvanizing cooling section for cooling to a target temperature; then the strip enters a PVD continuous coating section and a layer of magnesium is deposited on one surface or two surfaces of the strip, then the strip enters an annealing section to carry out alloying annealing on the coating to form a zinc-magnesium alloy coating, and the annealed strip enters a cooling section to be cooled to room temperature; then the strip enters a finishing section and a straightening and withdrawal section through a fourth steering roller to be subjected to finishing and straightening and withdrawal treatment, so that the surface quality and the strip shape of the strip are improved; then the strip enters a chemical treatment section to perform passivation treatment on the coating; and finally, the plate strip is output from the outlet section after passing through the outlet loop, and the production of the hot-rolled substrate zinc-magnesium alloy coating plate strip is completed.
Optionally, in the production process of the hot-rolled substrate galvanized sheet strip, the hot-rolled sheet strip enters a descaling section from an inlet section through an inlet loop to be descaled; the descaled strip enters a heating section through a first steering roller, the strip is heated to a certain temperature and then enters a zinc pot for galvanizing, the strip is blown by an air knife after galvanizing, and then enters a post-galvanizing cooling section for cooling to room temperature; then the strip passes through a Physical Vapor Deposition (PVD) continuous coating section, an annealing section, a cooling section and a fourth steering roller, and enters a finishing section and a straightening and withdrawal section in sequence for finishing and straightening and withdrawal treatment, so that the surface quality and the strip shape of the strip are improved; then the strip enters a chemical treatment section to perform passivation treatment on the coating; finally, the plate strip is output from the outlet section after passing through the outlet loop, and the production of the hot-rolled substrate galvanized plate strip is finished; in the production process, the steel strip only passes through a PVD (physical vapor deposition) continuous coating section, an annealing section and a cooling section, and related process section equipment does not participate in actual production operation;
optionally, in the production process of the hot-rolled substrate zinc-iron alloy coating plate strip, the hot-rolled plate strip enters a descaling section from an inlet section through an inlet loop to be descaled; the descaled strip enters a heating section through a first steering roller, the strip is heated to a certain temperature and then enters a zinc pot for galvanizing, the strip is blown by an air knife after galvanizing, and then enters a post-galvanizing cooling section for cooling to a target temperature; then the strip enters an annealing section through a Physical Vapor Deposition (PVD) continuous coating section to perform alloying annealing on the coating to form a zinc-iron alloy coating, and then the strip enters a cooling section to be cooled to room temperature; then the strip enters a finishing section and a straightening and withdrawal section through a fourth steering roller to be subjected to finishing and straightening and withdrawal treatment, so that the surface quality and the strip shape of the strip are improved; then the strip enters a chemical treatment section to perform passivation treatment on the coating; finally, the plate strip is output from the outlet section after passing through the outlet loop, and the production of the hot-rolled substrate zinc-iron alloy coating plate strip is completed; in the production process, the steel strip only passes through the PVD continuous coating section, and the PVD continuous coating section equipment does not participate in actual production operation;
optionally, in the production process of the hot-rolled descaled plate strip, the hot-rolled plate strip enters a descaled section from an inlet section through an inlet loop to be descaled; the descaled strip enters a finishing section and a pulling and straightening section through a first turning roll, a second turning roll, a third turning roll and a fourth turning roll to be subjected to finishing and pulling and straightening treatment in sequence, so that the surface quality and the plate shape of the strip are improved; then the plate strip is output from the outlet section through a chemical treatment section and an outlet loop to finish the production of the hot rolling descaled plate strip; in the production process, the steel strip only passes through the chemical treatment section, and the chemical treatment section equipment does not participate in actual production operation.
Optionally, a shot blasting machine is used for descaling in the descaling section, the abrasive and water are mixed to prepare mortar, and the mortar is thrown to the surface of the hot rolled steel plate through the shot blasting machine to remove an oxide layer.
Optionally, the size of the abrasive is 0.1 mm-1.0 mm; the mass ratio of the abrasive to water in the mortar is 0.25: 1-4: 1; the throwing speed of the mortar from the shot blasting machine is 40-80 m/s, and the throwing processing time of the hot rolled steel plate is 1-5 s.
Optionally, the annealing temperature of the annealing section plate strip is as follows: the alloying annealing temperature of the hot-rolled substrate zinc-magnesium alloy coating plate strip is 400-420 ℃; the alloying annealing temperature of the hot-rolled substrate zinc-iron alloy coating plate strip is 500-570 ℃.
Optionally, the cooling mode of the cooling section is one or more of air cooling, water mist cooling and water quenching cooling.
Optionally, the working pressure in the multi-stage differential pressure chamber at the inlet of the PVD continuous coating section is gradually reduced from atmospheric pressure to 1×10-3 Pa; working pressure in outlet multistage differential pressure chamber is from 1×Gradually reducing the pressure of 10-3Pa to atmospheric pressure; the physical vapor deposition process of the vacuum deposition chamber adopts one or more process combinations of magnetron sputtering plating, multi-arc ion plating, electron beam evaporation plating and vacuum evaporation plating.
The invention has the beneficial effects that:
1) PVD is a dry coating process, and simultaneously, the coating environment is in a vacuum state, so that no environmental pollutants such as waste water, waste gas, waste residue and the like are generated in the whole production process, and the current requirements of green manufacturing can be met;
2) the PVD can realize single-sided and double-sided combination, and the process is flexible;
3) the invention adopts mechanical descaling, has no discharge of pollutants such as waste water, waste gas and the like, and is environment-friendly;
4) the invention adopts mechanical descaling, compared with the traditional pickling process, the surface roughness of the strip steel is higher, and the coating adhesion is favorably improved;
5) the invention realizes continuous treatment of descaling, galvanizing, PVD coating and alloying annealing, and has compact process;
6) the unit of the invention can realize four functions: (1) the method comprises the following steps of (1) producing a hot-rolled substrate zinc-magnesium alloy coating plate strip, (2) producing a hot-rolled substrate zinc-iron alloy coating plate strip, (3) producing a hot-rolled substrate zinc-iron alloy coating plate strip, and (4) producing a hot-rolled descaling plate strip.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
fig. 1 shows a schematic flow diagram of the plant.
FIG. 2 is a schematic flow chart of a process for producing a zinc-magnesium alloy coated plate strip of a hot-rolled substrate.
FIG. 3 is a schematic flow chart of a hot-rolled substrate galvanized sheet strip production process.
FIG. 4 is a schematic flow chart of a process for producing a hot-rolled substrate zinc-iron alloy coated plate strip.
FIG. 5 is a schematic flow chart of the production process of the hot rolled descaled strip.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1-5, the reference numbers in the figures refer to the following elements: 1-an inlet section, 2-an inlet loop, 3-a descaling section, 4-a first steering roller, 5-a second steering roller, 6-a heating section, 7-a hot galvanizing section, 8-an air knife, 9-a cooling section after plating, 10-a third steering roller, 11-a Physical Vapor Deposition (PVD) continuous coating and plating section, 12-an annealing section, 13-a cooling section, 14-a fourth steering roller, 15-a finishing section, 16-a pulling and straightening section, 17-a chemical treatment section, 18-an outlet loop and 19-an outlet section.
Example one
In this embodiment, the unit produces the hot-rolled substrate zinc-magnesium alloy coated plate strip, the production process flow is shown in fig. 2, and the devices in the dotted line part do not participate in the actual production operation. The steel belt advancing direction is as follows: the inlet section → the inlet loop → the descaling section → the first steering roller → the heating section → the hot galvanizing section → the air knife → the cooling section after plating → the PVD continuous coating section → the annealing section → the cooling section → the fourth steering roller → the finishing section → the straightening and pulling section → the chemical treatment section → the outlet loop → the outlet section, and the specific process and process parameters are as follows:
1) after being uncoiled by an uncoiler at an inlet section, a hot-rolled steel coil is welded with the tail end of the last steel coil strip after the head of the strip is cut off, and enters a descaling section through an inlet loop and a first steering roller to be descaled;
2) the steel strip enters a descaling section and is subjected to shot blasting descaling treatment by adopting a wet type impeller, the ejection medium of the impeller is mortar formed by mixing steel sand and water, and the descaling treatment process parameters are as follows: the size of the steel grit is 0.8mm, the mass ratio of the steel grit to water is 0.6:1, the mortar ejection speed is 60m/s, and the steel plate treatment time is 3 s;
3) after descaling treatment, the steel strip enters a heating section for heating, wherein the heating section adopts a horizontal annealing furnace, and the heating temperature of the steel strip is 470 ℃;
4) after the steel strip comes out of the annealing furnace, the steel strip directly enters a zinc pot for galvanizing, the temperature of zinc liquid in the zinc pot is 460 ℃, and the weight of the zinc layer is 100g/m2 on both sides;
5) after the steel strip is taken out of the zinc pot, the steel strip is blown by an air knife and cooled to 150 ℃ by air jet cooling and water quenching;
6) the strip steel enters a PVD continuous coating section, the pressure is reduced to 1 x 10 < -3 > Pa from the atmospheric pressure after passing through an inlet multistage differential pressure chamber, then the surface of the strip steel is subjected to plasma cleaning and then enters a vacuum deposition chamber, magnesium is deposited on the two sides of the surface of the strip steel, the weight of the magnesium is 3g/m2, and then the strip steel is discharged from the PVD continuous coating section through an outlet multistage differential pressure chamber;
7) the strip steel enters an annealing section to carry out coating alloying annealing, the annealing section adopts a vertical annealing furnace, the heating temperature of the strip steel is 410 ℃, and after alloying annealing, the strip steel is cooled to room temperature through air cooling and water quenching;
8) the finishing section adopts a 4-roller finishing machine, and the rolling elongation is 1.0 percent;
9) the withdrawal and straightening elongation rate is 0.5 percent;
10) after the steel strip is subjected to the finishing, pulling and straightening treatment, the steel strip enters a chemical treatment section for surface treatment, a hexavalent chromic acid solution is adopted as a passivation solution, the passivation solution is coated on the surface of the steel strip through a coating roller, and then the steel strip is dried to 80 ℃ and cooled to room temperature;
11) the strip steel enters the outlet section through the outlet loop, the surface quality is checked at the outlet section, and then the strip steel is coated with oil, cut and coiled into coils.
Example two
In this embodiment, the hot-rolled substrate galvanized sheet strip is produced by the unit, the production process flow is shown in fig. 3, and the dotted line part equipment does not participate in actual production operation. The steel belt advancing direction is as follows: the inlet section → the inlet loop → the descaling section → the first steering roller → the heating section → the hot galvanizing section → the air knife → the cooling section after plating → the fourth steering roller → the finishing section → the pulling and straightening section → the chemical treatment section → the outlet loop → the outlet section, and the specific process and the process parameters are as follows:
1) after being uncoiled by an uncoiler at an inlet section, a hot-rolled steel coil is welded with the tail end of the last steel coil strip after the head of the strip is cut off, and enters a descaling section through an inlet loop and a first steering roller to be descaled;
2) the steel strip enters a descaling section and is subjected to shot blasting descaling treatment by adopting a wet type impeller, the ejection medium of the impeller is mortar formed by mixing steel sand and water, and the descaling treatment process parameters are as follows: the size of the steel grit is 0.8mm, the mass ratio of the steel grit to water is 0.6:1, the mortar ejection speed is 60m/s, and the steel plate treatment time is 3 s;
3) after descaling treatment, the steel strip enters a heating section for heating, wherein the heating section adopts a horizontal annealing furnace, and the heating temperature of the steel strip is 470 ℃;
4) after the steel strip comes out of the annealing furnace, the steel strip directly enters a zinc pot for galvanizing, the temperature of zinc liquid in the zinc pot is 460 ℃, and the weight of the zinc layer is 100g/m2 on both sides;
5) after the steel strip is taken out of the zinc pot, the steel strip is blown by an air knife and cooled to room temperature by air injection cooling and water quenching;
6) the strip steel enters a finishing section and a pulling and straightening section through a PVD continuous coating section, an annealing section, a cooling section and a fourth steering roller to be subjected to finishing and pulling and straightening treatment in sequence;
7) the finishing section adopts a 4-roller finishing machine, and the rolling elongation is 1.0 percent;
8) the withdrawal and straightening elongation rate is 0.5 percent;
9) after the steel strip is subjected to the finishing, pulling and straightening treatment, the steel strip enters a chemical treatment section for surface treatment, a hexavalent chromic acid solution is adopted as a passivation solution, the passivation solution is coated on the surface of the steel strip through a coating roller, and then the steel strip is dried to 80 ℃ and cooled to room temperature;
10) the strip steel enters the outlet section through the outlet loop, the surface quality is checked at the outlet section, and then the strip steel is coated with oil, cut and coiled into coils.
EXAMPLE III
In this embodiment, the unit produces the hot-rolled substrate zinc-iron alloy coated plate strip, and the devices in the dotted line do not participate in the actual production operation. The steel belt advancing direction is as follows: the inlet section → the inlet loop → the descaling section → the first steering roller → the heating section → the hot galvanizing section → the air knife → the cooling section after the plating → the annealing section → the cooling section → the fourth steering roller → the finishing section → the pulling and straightening section → the chemical treatment section → the outlet loop → the outlet section, and the specific process and the process parameters are as follows:
1) after being uncoiled by an uncoiler at an inlet section, a hot-rolled steel coil is welded with the tail end of the last steel coil strip after the head of the strip is cut off, and enters a descaling section through an inlet loop and a first steering roller to be descaled;
2) the steel strip enters a descaling section and is subjected to shot blasting descaling treatment by adopting a wet type impeller, the ejection medium of the impeller is mortar formed by mixing steel sand and water, and the descaling treatment process parameters are as follows: the size of the steel grit is 0.8mm, the mass ratio of the steel grit to water is 0.6:1, the mortar ejection speed is 60m/s, and the steel plate treatment time is 3 s;
3) after descaling treatment, the steel strip enters a heating section for heating, wherein the heating section adopts a horizontal annealing furnace, and the heating temperature of the steel strip is 470 ℃;
4) after the steel strip comes out of the annealing furnace, the steel strip directly enters a zinc pot for galvanizing, the temperature of zinc liquid in the zinc pot is 460 ℃, and the weight of the zinc layer is 100g/m2 on both sides;
5) after the steel strip is discharged from the zinc pot, the steel strip is blown by an air knife and cooled to 250 ℃ by air injection;
6) allowing the strip steel to enter an annealing section through a PVD (physical vapor deposition) continuous coating section to perform coating alloying annealing, wherein the annealing section adopts a vertical annealing furnace, the heating temperature of the strip steel is 550 ℃, and after the alloying annealing, the strip steel is cooled to room temperature through air cooling and water quenching;
7) the finishing section adopts a 4-roller finishing machine, and the rolling elongation is 1.0 percent;
8) the withdrawal and straightening elongation rate is 0.5 percent;
9) after the steel strip is subjected to the finishing, pulling and straightening treatment, the steel strip enters a chemical treatment section for surface treatment, a hexavalent chromic acid solution is adopted as a passivation solution, the passivation solution is coated on the surface of the steel strip through a coating roller, and then the steel strip is dried to 80 ℃ and cooled to room temperature;
10) the strip steel enters the outlet section through the outlet loop, the surface quality is checked at the outlet section, and then the strip steel is coated with oil, cut and coiled into coils.
Example four
In this embodiment, the hot-rolled descaled plate strip is produced by the unit, the production process flow is shown in fig. 5, and the devices in the dotted line part do not participate in the actual production operation. The steel belt advancing direction is as follows: the inlet section → the inlet loop → the descaling section → the first steering roller → the second steering roller → the third steering roller → the fourth steering roller → the finishing section → the pulling and straightening section → the outlet loop → the outlet section, and the specific process and process parameters are as follows:
1) after being uncoiled by an uncoiler at an inlet section, a hot-rolled steel coil is welded with the tail end of the last steel coil strip after the head of the strip is cut off, and enters a descaling section through an inlet loop 2 for descaling treatment;
2) the steel strip enters a descaling section and is subjected to shot blasting descaling treatment by adopting a wet type impeller, the ejection medium of the impeller is mortar formed by mixing steel sand and water, and the descaling treatment process parameters are as follows: the size of the steel grit is 0.8mm, the mass ratio of the steel grit to water is 0.6:1, the mortar ejection speed is 60m/s, and the steel plate treatment time is 3 s;
3) after descaling treatment, the steel strip enters a finishing and straightening section through a first turning roll, a second turning roll, a third turning roll and a fourth turning roll to be subjected to finishing and straightening treatment in sequence;
4) the finishing section adopts a 4-roller finishing machine, and the rolling elongation is 1.0 percent;
5) the withdrawal and straightening elongation rate is 0.5 percent;
6) after the steel strip is subjected to the finishing, pulling and straightening treatment, the steel strip enters the outlet section through the chemical treatment section and the outlet loop, the surface quality is checked at the outlet section, then oil is coated, cut and coiled into a coil, and equipment at the chemical treatment section does not participate in production in the process.
In conclusion, the invention provides a hot-rolled substrate zinc-based coated plate strip production line and a production method thereof, and various products can be produced by the same unit by combining environment-friendly descaling, hot galvanizing, PVD coating and alloying annealing processes. Compared with the traditional acid washing, hot dipping and other processes, the unit and the method provided by the invention also have the advantages of product quality, flexible process, environmental friendliness and the like.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A hot-rolled substrate zinc-based coating plate strip production unit is characterized by comprising an inlet section, an inlet loop, a descaling section, a first steering roller, a heating section, a hot galvanizing section, an air knife, a cooling section after plating, a PVD (physical vapor deposition) continuous coating section, an annealing section, a cooling section, a fourth steering roller, a finishing section, a straightening and withdrawal section, a chemical treatment section, an outlet loop and an outlet section which are sequentially connected; the device also comprises a second steering roller and a third steering roller which are connected in parallel between the first steering roller and the fourth steering roller.
2. The hot-rolled substrate zinc-based coated plate strip production unit as claimed in claim 1, wherein the PVD continuous coating section comprises an inlet multistage differential pressure chamber, a plasma cleaning chamber, a heating chamber, a vacuum deposition chamber and an outlet multistage differential pressure chamber which are arranged in sequence.
3. The hot-rolled substrate zinc-based coated sheet strip production line as claimed in claim 1, wherein the heating section is a horizontal furnace or a vertical furnace, and the heating temperature of the steel strip in the heating section is 450 ℃ to 480 ℃.
4. The hot-rolled substrate zinc-based coated sheet strip production line of claim 1, wherein the annealing section is a horizontal furnace or a vertical furnace, and the maximum heating temperature of the steel strip in the annealing section is 600 ℃.
5. A production process of a hot-rolled substrate zinc-based coated plate strip is characterized in that the production unit of the hot-rolled substrate zinc-based coated plate strip as described in any one of claims 1 to 4 is adopted, and the production process comprises a hot-rolled substrate zinc-magnesium alloy coated plate strip production process, a hot-rolled substrate zinc-based coated plate strip production process, a hot-rolled substrate zinc-iron alloy coated plate strip production process and a hot-rolled descaled plate strip production process;
in the production process of the hot-rolled substrate zinc-magnesium alloy coating plate strip, the hot-rolled plate strip enters a descaling section from an inlet section through an inlet loop to be descaled; the descaled strip enters a heating section through a first steering roller, the strip is heated to a certain temperature and then enters a zinc pot for galvanizing, the strip is blown by an air knife after galvanizing, and then enters a post-galvanizing cooling section for cooling to a target temperature; then the strip enters a PVD continuous coating section and a layer of magnesium is deposited on one surface or two surfaces of the strip, then the strip enters an annealing section to carry out alloying annealing on the coating to form a zinc-magnesium alloy coating, and the annealed strip enters a cooling section to be cooled to room temperature; then the strip enters a finishing section and a straightening and withdrawal section through a fourth steering roller to be subjected to finishing and straightening and withdrawal treatment, so that the surface quality and the strip shape of the strip are improved; then the strip enters a chemical treatment section to perform passivation treatment on the coating; and finally, the plate strip is output from the outlet section after passing through the outlet loop, and the production of the hot-rolled substrate zinc-magnesium alloy coating plate strip is completed.
6. The process for producing a hot-rolled zinc-based coated sheet strip as claimed in claim 5, wherein in the process for producing the hot-rolled zinc-based coated sheet strip, the hot-rolled sheet strip enters a descaling section from an inlet section through an inlet loop to be descaled; the descaled strip enters a heating section through a first steering roller, the strip is heated to a certain temperature and then enters a zinc pot for galvanizing, the strip is blown by an air knife after galvanizing, and then enters a post-galvanizing cooling section for cooling to room temperature; then the strip passes through a Physical Vapor Deposition (PVD) continuous coating section, an annealing section, a cooling section and a fourth steering roller, and enters a finishing section and a straightening and withdrawal section in sequence for finishing and straightening and withdrawal treatment, so that the surface quality and the strip shape of the strip are improved; then the strip enters a chemical treatment section to perform passivation treatment on the coating; finally, the plate strip is output from the outlet section after passing through the outlet loop, and the production of the hot-rolled substrate galvanized plate strip is finished; in the production process, the steel strip only passes through the PVD continuous coating section, the annealing section and the cooling section, and relevant process section equipment does not participate in actual production operation.
7. The process for producing a hot-rolled zinc-based coated sheet strip as claimed in claim 5, wherein in the process for producing the hot-rolled zinc-iron alloy coated sheet strip, the hot-rolled sheet strip enters a descaling section from an inlet section through an inlet loop to be descaled; the descaled strip enters a heating section through a first steering roller, the strip is heated to a certain temperature and then enters a zinc pot for galvanizing, the strip is blown by an air knife after galvanizing, and then enters a post-galvanizing cooling section for cooling to a target temperature; then the strip enters an annealing section through a Physical Vapor Deposition (PVD) continuous coating section to perform alloying annealing on the coating to form a zinc-iron alloy coating, and then the strip enters a cooling section to be cooled to room temperature; then the strip enters a finishing section and a straightening and withdrawal section through a fourth steering roller to be subjected to finishing and straightening and withdrawal treatment, so that the surface quality and the strip shape of the strip are improved; then the strip enters a chemical treatment section to perform passivation treatment on the coating; finally, the plate strip is output from the outlet section after passing through the outlet loop, and the production of the hot-rolled substrate zinc-iron alloy coating plate strip is completed; in the production process, the steel strip only passes through the PVD continuous coating section, and the PVD continuous coating section equipment does not participate in actual production operation.
8. The process for producing a hot-rolled substrate zinc-based coated plate strip as claimed in claim 5, wherein in the process for producing the hot-rolled descaled plate strip, the hot-rolled plate strip enters a descaled section from an inlet section through an inlet loop to be descaled; the descaled strip enters a finishing section and a pulling and straightening section through a first turning roll, a second turning roll, a third turning roll and a fourth turning roll to be subjected to finishing and pulling and straightening treatment in sequence, so that the surface quality and the plate shape of the strip are improved; then the plate strip is output from the outlet section through a chemical treatment section and an outlet loop to finish the production of the hot rolling descaled plate strip; in the production process, the steel strip only passes through the chemical treatment section, and the chemical treatment section equipment does not participate in actual production operation.
9. The process for producing a hot-rolled substrate zinc-based coated plate strip as claimed in claim 5, wherein a shot blasting machine is used for descaling in a descaling section, an abrasive is mixed with water to prepare mortar, and the mortar is thrown to the surface of the hot-rolled steel plate through a shot blasting machine to remove an oxide layer.
10. The process for producing a hot-rolled substrate zinc-based coated sheet strip as claimed in claim 5, wherein the working pressure in the multistage differential pressure chamber at the inlet of the PVD continuous coating section is gradually reduced from atmospheric pressure to 1 × 10-3Pa, working pressure in the outlet multistage pressure difference chamber is from 1 × 10-3Pa is gradually reduced to atmospheric pressure; the physical vapor deposition process of the vacuum deposition chamber adopts one or more process combinations of magnetron sputtering plating, multi-arc ion plating, electron beam evaporation plating and vacuum evaporation plating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010538016.3A CN111659748A (en) | 2020-06-12 | 2020-06-12 | Hot-rolled substrate zinc-based coated plate strip production unit and production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010538016.3A CN111659748A (en) | 2020-06-12 | 2020-06-12 | Hot-rolled substrate zinc-based coated plate strip production unit and production process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111659748A true CN111659748A (en) | 2020-09-15 |
Family
ID=72387465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010538016.3A Withdrawn CN111659748A (en) | 2020-06-12 | 2020-06-12 | Hot-rolled substrate zinc-based coated plate strip production unit and production process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111659748A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113913599A (en) * | 2021-10-29 | 2022-01-11 | 中冶赛迪工程技术股份有限公司 | Martensite steel strip continuous coating production line and production process |
-
2020
- 2020-06-12 CN CN202010538016.3A patent/CN111659748A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113913599A (en) * | 2021-10-29 | 2022-01-11 | 中冶赛迪工程技术股份有限公司 | Martensite steel strip continuous coating production line and production process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2506321C2 (en) | General-purpose line for treatment of steel strip for production of high-strength steel of various types | |
| JP3582512B2 (en) | Steel plate for hot pressing and method for producing the same | |
| KR101578848B1 (en) | Method for coating a warm or cold-rolled flat steel product comprising 6-30 weight% mn with a metallic protective layer | |
| CN104213017B (en) | A kind of galvanized steel plain sheet and production technology thereof | |
| CN212451601U (en) | Continuous descaling and plating production line for steel plate strips | |
| US20090139872A1 (en) | Method for producing a sheet steel product protected against corrosion | |
| CN101812579B (en) | Flexible strip steel treating line suitable for producing various high-strength steel | |
| KR20070042578A (en) | Highly corrosion resistant zn alloy plated steel material having hairline appearance | |
| CN102691004B (en) | Production method for treating weathering steel for containers without sand blasting or shot blasting | |
| EP3126540B1 (en) | Multi-layer substrate and fabrication method | |
| CN110423971B (en) | Hot-dip galvanized steel plate with excellent welding performance and corrosion resistance and preparation method thereof | |
| CN105112914A (en) | Continuous hot-dip galvanizing device and continuous hot-dip galvanizing method | |
| JPS5837391B2 (en) | Method for manufacturing cold-rolled steel sheet with excellent phosphate treatment properties | |
| CN110565003A (en) | Production process of hot-dip galvanized sheet without zinc flower and with 0.9-2.5mm thick zinc layer | |
| CN105177573A (en) | Combined unit for steel strip continuous hot-dip galvanizing and zinc-magnesium alloy plating and production method for combined unit | |
| CN102312167A (en) | High-strength hot rolled steel plate for counter enameling and manufacturing method thereof | |
| CN111411321A (en) | Continuous descaling and plating production line for steel plate strips and production method thereof | |
| CN212442629U (en) | Hot rolling base plate zinc-based coating plate strip production unit | |
| CN111659748A (en) | Hot-rolled substrate zinc-based coated plate strip production unit and production process | |
| JP4700543B2 (en) | Aluminum-based hot-pressed steel with excellent adhesion and corrosion resistance after painting | |
| SE527393C2 (en) | Aluminum coated stainless steel strip product for use as a sacrificial anode | |
| AU2011275945A1 (en) | Method and production line for producing a cold rolled flat steel product from a rustproof steel | |
| US20220186351A1 (en) | Zinc-plated steel sheet for hot stamping, method of manufacturing zinc-plated steel sheet for hot stamping, and hot-stamping formed body | |
| KR100985349B1 (en) | Continuous Hot-dip Coating Line and Method for Continuous Hot-dip Coating Steel Strip | |
| CN216891193U (en) | Continuous coating and plating production line for martensite steel strip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200915 |