Method for producing galfan sheet products for deep drawing

Abstract

The application discloses a production method of a galfan sheet product for deep drawing, and the method comprises the following steps: inputting a strip steel from an entrance of a loop car according to a preset initial speed; pretreating the strip steel, feeding the strip steel into an annealing furnace according to different speeds according to different types, and heating and keeping temperature in different temperature ranges in the annealing furnace; feeding the strip steel into a zinc pot, and galvanizing the strip steel after annealing; scraping off the excess zinc liquid by using an air knife, and cooling the strip steel after galvanizing; and performing finishing and tension leveling after cooling; and coiling the sheet after tension leveling under an outlet loop. The application realizes fast and balanced production of the product through the control of the temperature and the speed in the whole production control.

Description

Technical Field

[0001] This invention relates to the field of material forming technology, and in particular to a method for producing galfan thin sheet products for deep drawing. Background Technology

[0002] Currently, tinplate is commonly used as a raw material in product packaging. However, tinplate is difficult to manufacture and lacks the protective mechanism of sacrificial anodes, resulting in corrosion resistance far inferior to galfan products. With the development of the galvanizing industry, galfan products have gained popularity due to their excellent corrosion resistance and low zinc consumption, especially for products requiring simple stamping, and are widely used in the product packaging field.

[0003] However, in the current production process of galfan (zinc-aluminum alloy coated sheet), uneven coating thickness or overall performance degradation after galvanizing often occurs due to uneven control of the temperature and speed of galvanizing the strip. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide a method for producing galfan thin sheet products for deep drawing, which achieves rapid and balanced production by controlling the temperature and speed throughout the entire production process.

[0005] To achieve the above objectives, the present invention provides a method for producing galfan thin sheet products for deep drawing, comprising: The strip steel is fed into the looper car inlet at a preset initial speed; The strip steel is pretreated by following the process of alkaline spraying, electrolytic cleaning, water rinsing and drying to remove residual substances from the strip steel surface. The strip steel is fed into the annealing furnace at a speed of 85-65 m / min according to its type, and heated and held in the annealing furnace at a temperature range of (780-820) ±10℃. The coated product is heated to 480±5℃ in a zinc pot, and the strip steel is fed into the zinc pot to galvanize the annealed strip steel. When the strip steel exits the zinc pot, an air knife is used to scrape off excess zinc, controlling the zinc layer thickness to 8-15 g / m² on one side. 2 The galvanized strip steel is cooled at a cooling rate of ≥20℃ / s; and after cooling, it is smoothed with a smoothing elongation of (0.6-0.8) ±0.1% and then tensioned with a tensioning elongation of 1-1.5%. After straightening, the thin sheet is passivated and treated to resist fingerprints before being rolled up in the export looper.

[0006] In a further preferred embodiment, when the strip steel is selected as grade T4, it is fed into the annealing furnace at a speed of 80±5m / min, heated and held at a temperature range of 780±10℃ in the annealing furnace, and then finished in the finishing machine at a finishing elongation of 0.6±0.1%.

[0007] In a further preferred embodiment, when the strip steel is selected as grade T3, it is fed into the annealing furnace at a speed of 75±5m / min, heated and held at a temperature range of 800±10℃ in the annealing furnace, and then finished in the finishing machine at a finishing elongation of 0.7±0.1%.

[0008] In a further preferred embodiment, when the strip steel is selected as grade T2.5, it is fed into the annealing furnace at a speed of 70±5m / min, heated and held at a temperature range of 820±10℃ in the annealing furnace, and then finished in the finishing machine at a finishing elongation of 0.8±0.1%.

[0009] More preferably, the zinc coating is a 5%Al-95%Zn coating product.

[0010] More preferably, the steel strip substrate is of CQ grade, with the carbon content mainly controlled at 0.15±0.05%.

[0011] A further preferred embodiment includes electrostatic oiling of the sheet after the export looper is unwound.

[0012] The production method of galfan thin sheet products for deep drawing disclosed in this application avoids problems such as uneven coating thickness during the galvanizing process or overall performance degradation due to unstable local heating, by precisely controlling the temperature and speed of strip galvanizing. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the production process of the deep-drawing galfan thin plate product of the present invention. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] like Figure 1 As shown, one embodiment of the present invention provides a method for producing a galfan thin sheet product for deep drawing, comprising: S1. Input the strip steel from the looper car inlet at a preset initial speed; the strip steel substrate is selected from CQ grade, and the main carbon content is controlled at 0.15±0.05%.

[0016] S2. Pre-treat the strip steel by following the process of alkaline spraying, electrolytic cleaning, water rinsing and drying to remove residual substances from the strip steel surface.

[0017] S3. Feed the strip steel into the annealing furnace at a speed of 85-65 m / min, depending on the type. Heat and hold the strip steel in the annealing furnace at a temperature range of (780-820) ±10℃. 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.

[0018] S4. Heat the coated product to 480±5℃ in a zinc pot, and put the strip steel into the zinc pot to galvanize the annealed strip steel; the zinc coating is a 5%Al-95%Zn coating product.

[0019] S5. When the strip exits the zinc pot, use an air knife to scrape off excess zinc liquid, controlling the zinc layer thickness to 8-15 g / m² on one side. 2 .

[0020] S6. Cool the galvanized strip at a cooling rate of ≥20℃ / s; and after cooling, perform finishing with a finishing elongation of (0.6-0.8) ±0.1% and then perform tension straightening with a tension straightening elongation of 1-1.5%.

[0021] S7. After straightening, the thin plate is passivated and treated to resist fingerprints before being rolled up in the export looper.

[0022] Example 1: When the strip steel is selected as grade T4, it is fed into the annealing furnace at a speed of 80±5m / min, heated and held at a temperature range of 780±10℃ in the annealing furnace, and then finished in the finishing machine at a finishing elongation of 0.6±0.1%.

[0023] Example 2: When the strip steel is selected as grade T3, it is fed into the annealing furnace at a speed of 75±5m / min, heated and held at a temperature range of 800±10℃ in the annealing furnace, and then finished in the finishing machine at a finishing elongation of 0.7±0.1%.

[0024] Example 3: When the strip steel is selected as grade T2.5, it is fed into the annealing furnace at a speed of 70±5m / min, heated and held at a temperature range of 820±10℃ in the annealing furnace, and then finished in the finishing machine at a finishing elongation of 0.8±0.1%.

[0025] A further preferred embodiment includes electrostatic oiling of the sheet after the export looper is unwound.

[0026] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for producing galfan thin sheet products for deep drawing, characterized in that, include: The strip steel is fed into the looper car inlet at a preset initial speed; The strip steel is pretreated by following the process of alkaline spraying, electrolytic cleaning, water rinsing and drying to remove residual substances from the strip steel surface. The strip steel is fed into the annealing furnace at a speed of 85-65 m / min according to its type, and heated and held in the annealing furnace at a temperature range of (780-820) ±10℃. When the strip steel is selected as grade T4, it is fed into the annealing furnace at a speed of 80±5m / min, heated and held at a temperature range of 780±10℃ in the annealing furnace, and then finished in the finishing machine at a finishing elongation of 0.6±0.1%. When the strip steel is selected as grade T3, it is fed into the annealing furnace at a speed of 75±5m / min, heated and held at a temperature range of 800±10℃ in the annealing furnace, and then finished in the finishing machine at a finishing elongation of 0.7±0.1%. When the strip steel is selected as grade T2.5, it is fed into the annealing furnace at a speed of 70±5m / min, heated and held at a temperature range of 820±10℃ in the annealing furnace, and then finished in the finishing machine at a finishing elongation of 0.8±0.1%. The coated product is heated to 480±5℃ in a zinc pot, and the strip steel is fed into the zinc pot to galvanize the annealed strip steel. The coating is selected from 5%Al-95%Zn coating products; The steel strip substrate is selected from CQ grade, with a carbon content controlled at 0.15±0.05%; When the strip steel exits the zinc pot, an air knife is used to scrape off excess zinc, controlling the zinc layer thickness to 8-15 g / m² on one side. 2 ; The galvanized strip steel is cooled at a cooling rate of ≥20℃ / s; and after cooling, it is smoothed with a smoothing elongation of (0.6-0.8) ±0.1% and then tensioned with a tensioning elongation of 1-1.5%. After straightening, the thin sheet is passivated and treated to resist fingerprints before being rolled up in the export looper.

2. The method for producing deep-drawing galfan thin sheet products according to claim 1, characterized in that, This also includes electrostatic oiling of the sheet after the export looper is unwound.

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