Production method of galfan sheet product for deep drawing

Abstract

The invention discloses a production method of a galfan sheet product for deep drawing. The method comprises the following steps: inputting strip steel from an entrance of a looping car according to a preset initial speed; the method comprises the following steps: pre-treating strip steel, feeding the strip steel into an annealing furnace according to different models and different speeds, and heating and preserving heat in different temperature ranges in the annealing furnace; the strip steel is input into a zinc pot, and the annealed strip steel is galvanized; an air knife is adopted to scrape redundant zinc liquid, and the galvanized strip steel is cooled; after cooling, finishing and straightening are carried out; and the stretched and straightened thin plate is rolled down at an outlet loop. According to the invention, rapid and balanced production of products is realized through temperature and speed control in the whole production control.

Description

Technical Field

[0001] The invention relates to the technical field of material forming, and in particular to a production method of a galfan thin plate product for deep drawing. Background Art

[0002] At present, tinplate is generally used as raw material in the product packaging field, but this product is difficult to produce as a whole, lacks the protection mechanism of sacrificial anode, and its corrosion resistance is far inferior to that of galfan products. With the development of the galvanizing industry, galfan products are favored by users due to their excellent corrosion resistance and low zinc consumption, especially for products that require simple stamping, and are widely used in the product packaging field.

[0003] However, in the current production process of galfan (zinc-aluminum alloy coated plate) thin plates, the control of the temperature and speed of galvanizing the strip is often unbalanced, resulting in uneven coating thickness during the galvanizing process, or the overall performance of the strip after galvanizing is reduced due to unstable local heating. Summary of the invention

[0004] Therefore, the object of the present invention is to provide a method for producing galfan thin plate products for deep drawing, which can achieve rapid and balanced production of products through temperature and speed control throughout the entire production process.

[0005] In order to achieve the above object, the present invention provides a method for producing a galfan thin plate product for deep drawing, comprising:

[0006] The strip steel is fed into the looper from the entrance at a preset initial speed;

[0007] Pre-treat the strip steel by following the process of alkali spray cleaning, electrolytic cleaning, water rinsing and drying to clean the surface residue of the strip steel;

[0008] The strip steel is fed into the annealing furnace at a speed of 85-65m / s according to different models, and heated and kept warm in the annealing furnace at a temperature range of (780-820)±10℃;

[0009] The coated product is heated to 480±5℃ in the zinc pot, the strip is fed into the zinc pot, and the annealed strip is galvanized;

[0010] When the strip is out of the zinc pot, the excess zinc liquid is scraped off by an air knife to control the zinc layer thickness to 8-15g / m on one side. 2

[0011] The galvanized strip is cooled at a cooling rate of ≥20°C / s; after cooling, it is skin-passed at a skin-pass elongation of (0.6-0.8) ±0.1% and straightened at a straightening elongation of 1-1.5%;

[0012] The straightened thin plate is passivated and anti-fingerprint treated and then rolled up at the exit loop.

[0013] Further preferably, when the strip steel model is selected as T4 grade, it is fed into the annealing furnace at a speed of 80±5m / s, heated and kept warm in the annealing furnace at a temperature range of 780±10°C, and skin-finished in the skin-finishing mill at a skin-finishing elongation of 0.6±0.1%.

[0014] Further preferably, when the strip steel model is selected as T3 grade, it is fed into the annealing furnace at a speed of 75±5m / s, heated and kept warm in the annealing furnace at a temperature range of 800±10°C, and skin-finished in a skin-finishing machine at a skin-finishing elongation of 0.7±0.1%.

[0015] Further preferably, when the strip steel model is selected as T2.5 grade, it is fed into the annealing furnace at a speed of 70±5m / s, heated and kept warm in the annealing furnace at a temperature range of 820±10°C, and skin-finished in the skin-finishing machine at a skin-finishing elongation of 0.8±0.1%.

[0016] Further preferably, the zinc coating is a 5% Al-95% Zn coating product.

[0017] Further preferably, the strip steel substrate is selected from CQ grade, and the carbon content is mainly controlled at 0.15±0.05%.

[0018] Further preferably, the thin plate is electrostatically oiled after the outlet loop is rolled down.

[0019] The production method of galfan thin plate products for deep drawing disclosed in the present application avoids the problem of uneven thickness of the coating on the steel strip during the galvanizing process, or the problem of decreased overall performance of the steel strip after galvanizing due to local thermal instability, by accurately controlling the temperature and speed of the steel strip galvanizing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a schematic diagram of the process flow of the production method of the galfan thin plate product for deep drawing. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below through the accompanying drawings and specific embodiments.

[0022] like Figure 1 As shown, an embodiment of the present invention provides a method for producing a galfan sheet product for deep drawing, comprising:

[0023] S1. Input the strip steel from the entrance of the looper at a preset initial speed; the strip steel substrate is selected to be CQ grade, and the main carbon content is controlled at 0.15±0.05%.

[0024] S2. Pre-treat the strip steel by cleaning the surface residue of the strip steel according to the process of alkali spray cleaning, electrolytic cleaning, water rinsing and drying;

[0025] S2. The strip steel is fed into the annealing furnace at a speed of 85-65 m / s according to different models, and heated and kept warm in the annealing furnace at a temperature range of (780-820) ± 10°C. It should be noted that when annealing in the annealing furnace, a protective atmosphere (such as nitrogen, hydrogen, etc.) is required to effectively prevent oxidation and decarburization.

[0026] S3. The coated product is heated to 480±5° C. in a zinc pot, and the strip steel is input into the zinc pot to galvanize the annealed strip steel; the zinc coating layer is a 5% Al-95% Zn coated product.

[0027] S4. Use an air knife to scrape off excess zinc liquid when the strip is out of the zinc pot, and control the zinc layer thickness to 8-15g / m on one side. 2 .

[0028] S5. Cool the galvanized strip at a cooling rate of ≥20°C / s; after cooling, perform skin-passing at a skin-passing elongation of (0.6-0.8) ±0.1%, and perform straightening at a straightening elongation of 1-1.5%.

[0029] S6. After passivation and fingerprint resistance treatment, the thin plate after tensioning and straightening is rolled down in the exit loop.

[0030] Example 1: When the strip steel model is T4 grade, it is fed into the annealing furnace at a speed of 80±5m / s, heated and kept warm in the annealing furnace at a temperature range of 780±10°C, and skin-passed in the skin-passing mill at a skin-passing elongation of 0.6±0.1%.

[0031] Example 2: When the strip steel model is selected as T3 grade, it is fed into the annealing furnace at a speed of 75±5m / s, heated and kept warm in the annealing furnace at a temperature range of 800±10°C, and skin-passed in the skin-passing mill at a skin-passing elongation of 0.7±0.1%.

[0032] Example 3: When the strip steel model is selected as T2.5 grade, it is fed into the annealing furnace at a speed of 70±5m / s, heated and kept warm in the annealing furnace at a temperature range of 820±10°C, and skin-passed in the skin-passing mill at a skin-passing elongation of 0.8±0.1%.

[0033] Further preferably, the thin plate is electrostatically oiled after the outlet loop is rolled down.

[0034] A thickness sensor is also provided in the present application, which can identify the current galvanized strip model according to the different strip models and automatically switch the temperature and furnace entry speed of the annealing furnace.

[0035] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A method for producing a galfan sheet product for deep drawing, characterized in that: include: The strip steel is fed from the entrance of the looper at a preset initial speed; Pre-treat the strip steel by following the process of alkali spray cleaning, electrolytic cleaning, water rinsing and drying to clean the surface residue of the strip steel; The strip steel is fed into the annealing furnace at a speed of 85-65m / s according to different models, and heated and kept warm in the annealing furnace at a temperature range of (780-820)±10℃; The coated product is heated to 480±5℃ in the zinc pot, the strip is fed into the zinc pot, and the annealed strip is galvanized; When the strip is out of the zinc pot, the excess zinc liquid is scraped off by an air knife to control the zinc layer thickness to 8-15g / m on one side. 2 The galvanized strip is cooled at a cooling rate of ≥20°C / s; after cooling, it is skin-passed at a skin-pass elongation of (0.6-0.8) ±0.1% and straightened at a straightening elongation of 1-1.5%; The straightened thin plate is passivated and anti-fingerprint treated and then rolled up at the exit loop.

2. The method for producing a galfan sheet product for deep drawing according to claim 1, characterized in that: When the strip steel model is selected as T4 grade, it is fed into the annealing furnace at a speed of 80±5m / s, heated and kept warm in the annealing furnace at a temperature range of 780±10℃, and skin-passed in the skin-passing mill at a skin-passing elongation of 0.6±0.1%.

3. The method for producing a galfan sheet product for deep drawing according to claim 1, characterized in that: When the strip steel model is selected as T3 grade, it is fed into the annealing furnace at a speed of 75±5m / s, heated and kept warm in the annealing furnace at a temperature range of 800±10℃, and skin-passed in the skin-passing mill at a skin-passing elongation of 0.7±0.1%.

4. The method for producing a galfan sheet product for deep drawing according to claim 1, characterized in that: When the strip steel model is selected as T2.5 grade, it is fed into the annealing furnace at a speed of 70±5m / s, heated and kept warm in the annealing furnace at a temperature range of 820±10℃, and skin-passed in the skin-passing mill at a skin-passing elongation of 0.8±0.1%.

5. The method for producing a galfan sheet product for deep drawing according to claim 1, characterized in that: The coating is a 5% Al-95% Zn coating product.

6. The method for producing a galfan sheet product for deep drawing according to claim 1, characterized in that: The strip steel substrate is selected from CQ grade, and the carbon content is mainly controlled at 0.15±0.05%.

7. The method for producing a galfan sheet product for deep drawing according to claim 1, characterized in that: It also includes electrostatic oiling of the thin plate after the exit loop is rolled down.

Images