CN212442629U

CN212442629U - Hot rolling base plate zinc-based coating plate strip production unit

Info

Publication number: CN212442629U
Application number: CN202021094578.5U
Authority: CN
Inventors: 夏强强; 余晨韵; 刘玉堂; 韩会全
Original assignee: CISDI Engineering Co Ltd; CISDI Technology Research Center Co Ltd; CISDI Shanghai Engineering Co Ltd
Current assignee: CISDI Engineering Co Ltd; CISDI Technology Research Center Co Ltd; CISDI Shanghai Engineering Co Ltd
Priority date: 2020-06-12
Filing date: 2020-06-12
Publication date: 2021-02-02
Anticipated expiration: 2030-06-12

Abstract

The utility model belongs to the deep field that adds of steel band relates to a hot rolling base plate zinc-based plating layer slab band production unit, and this unit includes: 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 utility model combines the green surface descaling technology, the hot galvanizing technology and the PVD continuous coating technology, and has the characteristics of green, flexible technology, rich products and the like.

Description

Hot rolling base plate zinc-based coating plate strip production unit

Technical Field

The utility model belongs to the deep-processing field of steel band relates to a hot rolling base plate zinc-based plating layer slab band production unit.

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.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a hot rolling base plate zinc-based cladding material slab band production unit for solve product quality, technological flexibility, environmental pollution scheduling problem among the prior art.

In order to achieve the above purpose, the utility model provides a 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 450-480 ℃.

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.

The beneficial effects of the utility model reside in 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 utility model adopts mechanical descaling, no pollutant such as waste water and waste gas is discharged, and the environment is friendly;

4) the utility model adopts mechanical descaling, compared with the traditional pickling process, the surface roughness of the strip steel is higher, which is beneficial to improving the adhesive force of the plating layer;

5) the utility model realizes continuous treatment of descaling, galvanizing, PVD coating and alloying annealing, and has compact process;

6) the utility model discloses four kinds of functions can be realized to the unit: (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/or combinations particularly pointed out in the appended claims.

Drawings

For the purposes of promoting a better understanding of the objects, features 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 following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit 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, 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 any way limiting the scope of the invention; for a better understanding of 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 parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms 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:

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:

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;

8) the withdrawal and straightening elongation rate is 0.5 percent;

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;

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.

To sum up, the utility model provides a hot rolling base plate zinc-based plating layer slab band production line and production method thereof through the combination of environmental protection descaling, hot-galvanize, PVD scribble to plate and alloying annealing process, can realize that same unit produces multiple product. Compared with the traditional acid washing, hot dipping and other processes, the unit and the method provided by the utility model also have the advantages of product quality, flexible process, environmental protection and the like.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to 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 scope of the claims of the present invention.

Claims

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. The hot-rolled substrate zinc-based coated plate strip production unit as claimed in claim 1, wherein the descaling section is descaled by using a shot blasting machine, an abrasive is mixed with water to prepare mortar, and the mortar is ejected to the surface of the hot-rolled steel plate by using a shot blasting machine to remove an oxide layer.

6. The hot-rolled substrate zinc-based coated sheet strip production line of claim 1, wherein the finishing section employs one of a 2-roll finishing machine, a 4-roll finishing machine, and a 6-roll finishing machine.