阅读说明：本技术 一种无锌花0.9-2.5mm超厚锌层热镀锌板的生产工艺 (Production process of hot-dip galvanized sheet without zinc flower and with 0.9-2.5mm thick zinc layer ) 是由 游加伟 狄丽华 王欢龙 刘洪磊 吕世迎 马世文 黄友坡 张勇 李玉良 连晓磊 刘 于 2019-08-30 设计创作，主要内容包括：本发明设计镀锌板技术领域,具体涉及一种无锌花0.9-2.5mm超厚锌层热镀锌板的生产工艺。包括ESP工艺和PGL酸镀工艺,ESP工艺生产热轧钢带熔炼成分：C≤0.12％,Si≤0.50％,Mn：≤0.60％,P：≤0.10％,S≤0.045％,Fe：余量；铸坯不经均热炉加热直接进行热轧；PGL酸镀工艺包括酸洗、平整、镀锌、光整、钝化、卷取成热镀锌卷。本发明可实现0.9-2.5mm规格无锌花660g/m<Sup>2</Sup>超厚锌层热镀锌的生产,产品表面质量良好、尺寸精度高、镀层结合力强、性能稳定。(The invention relates to the technical field of galvanized plates, in particular to a production process of a hot-dip galvanized plate without zinc flakes and with an ultra-thick zinc layer of 0.9-2.5 mm. The method comprises an ESP process and a PGL acid plating process, wherein the ESP process is used for producing hot rolled steel strip smelting components: c is less than or equal to 0.12 percent, Si is less than or equal to 0.50 percent, Mn: less than or equal to 0.60 percent, P: less than or equal to 0.10 percent, less than or equal to 0.045 percent, Fe: the balance; directly hot rolling the casting blank without heating in a soaking pit; the PGL acid plating process comprises pickling, leveling, galvanizing, finishing, passivating and coiling to form the hot galvanizing coil. Hair brushbright can realize the non-spangle 660g/m with the specification of 0.9-2.5mm 2 The super-thick zinc layer hot galvanizing is produced, and the product has good surface quality, high dimensional precision, strong coating binding force and stable performance.)

1. a production process of a hot-dip galvanized sheet without zinc bloom and with an ultra-thick zinc layer of 0.9-2.5mm comprises an ESP process and a PGL acid plating process, and is characterized in that:

the ESP process produces hot rolled steel strip smelting components:

C is less than or equal to 0.12 percent, Si is less than or equal to 0.50 percent, Mn: less than or equal to 0.60 percent, P: less than or equal to 0.10 percent, less than or equal to 0.045 percent, Fe: the balance;

directly carrying out hot rolling on the casting blank without heating the casting blank by a soaking furnace, wherein the outlet temperature of finish rolling is 820-870 ℃, and the coiling temperature is 635-660 ℃;

The PGL acid plating process comprises pickling, leveling, galvanizing, finishing, passivating and coiling to form a hot galvanizing coil;

The pickling process has the following requirements: acid tank HCL content: 40-70g/L, acid washing temperature: 70-85 ℃;

the leveling process has the leveling elongation rate of 0.8-2.0% in the front of the furnace and the leveling elongation rate of 0.8-2.5% in the rear of the furnace;

the heating adopts an induction heating furnace: the soaking section of the radiant tube is 490-500 ℃, the jet air cooling section is 470-480 ℃, and the plate temperature is 470-480 ℃;

The galvanizing process comprises the following steps of: the Zn content is more than or equal to 99 percent, and the Al content is 0.2 +/-0.05 percent; temperature of zinc liquid: 460 +/-2 ℃;

according to the polishing process, the elongation of a polishing machine is 1.0 +/-0.2%.

2. the method of claim 1, wherein the hot-base non-flower high-strength galvanized sheet for building structures comprises the following steps: the galvanized sheet is a double-sided equal-thickness coating with the thickness of 0.9mm-2.5mm, and the weight of the coating is 660g/m²。

3. the production process of the hot-dip galvanized sheet without zinc flakes with the zinc layer thickness of 0.9-2.5mm according to claim 1, characterized in that: in the galvanizing process, the pressure of an upper air knife and a lower air knife is 45mbar-60mbar, the height of the air knife from a zinc liquid is 190mm-300mm, the distance of the air knife from a strip steel is 15mm-30mm, and the angle of the air knife is controlled to be-25 degrees to-15 degrees.

4. The production process of the hot-dip galvanized sheet without zinc flakes with the zinc layer thickness of 0.9-2.5mm according to claim 1, characterized in that: the dew point of the induction heating furnace is as follows: below-45 ℃.

5. The production process of the hot-dip galvanized sheet without zinc flakes with the zinc layer thickness of 0.9-2.5mm according to claim 1, characterized in that: the smelting components of the hot rolled steel strip are as follows: 0.03922% of C, 0.04096% of Si, 0.07631% of Mn, 0.01641% of P, 0.00024% of S, Fe: and (4) the balance.

6. The production process of the hot-dip galvanized sheet without zinc flakes with the zinc layer thickness of 0.9-2.5mm according to claim 1, characterized in that: the smelting components of the hot rolled steel strip are as follows: 0.03918% of C, 0.03775% of Si, 0.07643% of Mn, 0.01214% of P, 0.00205% of S, Fe: and (4) the balance.

7. The production process of the hot-dip galvanized sheet without zinc flakes with the zinc layer thickness of 0.9-2.5mm according to claim 1, characterized in that: the smelting components of the hot rolled steel strip are as follows: 0.04415% of C, 0.03957% of Si, 0.07327% of Mn, 0.01068% of P, 0.00048% of S, Fe: and (4) the balance.

Technical Field

The invention relates to the technical field of galvanized plates, in particular to a production process of a hot-dip galvanized plate without zinc flakes and with an ultra-thick zinc layer of 0.9-2.5 mm.

Background

The galvanized sheet has increased corrosion resistance with the increase of the thickness of the zinc layer. In recent years, with the higher requirements on the corrosion resistance of galvanized plates in the industries such as underground pipe galleries and the like, the higher requirements on the thickness of a zinc layer are also provided.

Traditional 660g/m²The coating of the hot-dip galvanized plate with the ultra-thick zinc layer is provided with spangles, and is produced by adopting hot-base (more than 2.3 mm) or cold-base (less than 2.3 mm) raw materials, and hot-base galvanizing produced by the traditional production line is completely a spangled product and has the defects of limited thin specification, poor dimensional precision, large performance fluctuation and the like; the cold base product needs to be processed by cold rolling and annealing procedures, the process flow is complex, the cost is high, and great difficulty exists in the aspect of thick specification production.

Disclosure of Invention

aiming at the defects of limited specification, poor size precision and large performance fluctuation of patterned products in the prior art, the invention provides a production process of a hot-dip galvanized plate with a zinc-free 0.9-2.5mm super-thick zinc layer, and the obtained advantages are that the advanced process of a hot-rolled steel strip and an acid pickling galvanizing production line based on esp continuous casting and rolling can realize 660g/m of the zinc-free patterned plate with the specification of 0.9-2.5mm²The super-thick zinc layer hot galvanizing is produced, and the product has good surface quality, high dimensional precision, strong coating binding force and stable performance.

The technical scheme of the invention is as follows:

A production process of a hot-dip galvanized sheet without zinc bloom and with an ultra-thick zinc layer of 0.9-2.5mm comprises an ESP process and a PGL acid plating process, and is characterized in that:

The ESP process produces hot rolled steel strip smelting components:

C is less than or equal to 0.12 percent, Si is less than or equal to 0.50 percent, Mn: less than or equal to 0.60 percent, P: less than or equal to 0.10 percent, less than or equal to 0.045 percent, Fe: the balance;

Directly carrying out hot rolling on the casting blank without heating the casting blank by a soaking furnace, wherein the outlet temperature of finish rolling is 820-870 ℃, and the coiling temperature is 635-660 ℃;

the PGL acid plating process comprises pickling, leveling, galvanizing, finishing, passivating and coiling to form a hot galvanizing coil;

the pickling process has the following requirements: acid tank HCL content: 40-70g/L, acid washing temperature: 70-85 ℃;

the leveling process has the leveling elongation rate of 0.8-2.0% in the front of the furnace and the leveling elongation rate of 0.8-2.5% in the rear of the furnace;

The heating adopts an induction heating furnace: the soaking section of the radiant tube is 490-500 ℃, the jet air cooling section is 470-480 ℃, and the plate temperature is 470-480 ℃;

the galvanizing process comprises the following steps of: the Zn content is more than or equal to 99 percent, and the Al content is 0.2 +/-0.05 percent; temperature of zinc liquid: 460 +/-2 ℃;

according to the polishing process, the elongation of a polishing machine is 1.0 +/-0.2%.

Preferably, the galvanized sheet is a double-sided equal-thickness coating with the thickness of 0.9mm-2.5mm, and the coating weight is 660g/m²。

preferably, in the galvanizing process, the pressure of an upper air knife and a lower air knife is 45mbar-60mbar, the height of the air knife from a zinc liquid is 190mm-300mm, the distance of the air knife from a strip steel is 15mm-30mm, and the angle of the air knife is controlled to be-25 degrees to-15 degrees.

preferably, the induction heating furnace dew point: below-45 ℃.

Preferably, the smelting components of the hot-rolled steel strip are as follows: 0.03922% of C, 0.04096% of Si, 0.07631% of Mn, 0.01641% of P, 0.00024% of S, Fe: and (4) the balance.

Preferably, the smelting components of the hot-rolled steel strip are as follows: 0.03918% of C, 0.03775% of Si, 0.07643% of Mn, 0.01214% of P, 0.00205% of S, Fe: and (4) the balance.

preferably, the smelting components of the hot-rolled steel strip are as follows: 0.04415% of C, 0.03957% of Si, 0.07327% of Mn, 0.01068% of P, 0.00048% of S, Fe: and (4) the balance.

The invention has the beneficial effects that:

The invention has reliable design principle and very wide application prospect. Based on an ESP and acid plating continuous production line, the novel process is adopted to produce the 0.9-2.5mm ultra-thick zinc layer hot-dip galvanized sheet, the product has good surface quality, stable performance and size deviation and excellent coating bonding force, and can replace a patterned galvanized sheet with the zinc layer weight of 660 g/square meter.

drawings

in order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 shows the appearance of the sample coating in example 2 of the present invention under a scanning electron microscope.

FIG. 2 shows the appearance of the zinc coating on the cross section of the sample according to the present invention.

FIG. 3 shows the line scanning results of the cross-section galvanized layer of the sample of the present invention.

Detailed Description

in order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.