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Hot-dipped aluminum-zinc alloy steel plate and preparation method thereof

An alloy steel plate and hot-dip aluminum technology, applied in the field of coating steel plate production, can solve the problems of poor yield strength and tensile strength, poor coating quality, and high production cost, and achieve thin coating thickness, simple composition design, and strong adaptability. Effect

Inactive Publication Date: 2017-08-11
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problems to be solved by the present invention are: the yield strength and tensile strength of the hot-dip aluminum-zinc alloy steel plate produced by the prior art are poor, the coating quality is not good, and the production cost is high.

Method used

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  • Hot-dipped aluminum-zinc alloy steel plate and preparation method thereof
  • Hot-dipped aluminum-zinc alloy steel plate and preparation method thereof
  • Hot-dipped aluminum-zinc alloy steel plate and preparation method thereof

Examples

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preparation example Construction

[0037] The present invention also provides a method for preparing the above-mentioned hot-dip aluminum-zinc alloy steel sheet, comprising the following steps:

[0038] Smelting-hot rolling-cold rolling-cleaning-annealing-hot-dip galvalume-post-plating cooling-finishing-stretch leveling-surface treatment-oiling-coiling-finished products;

[0039] The heating temperature of the slab during the hot rolling is 1230-1260°C, the time in the furnace is 180min-300min, the finishing temperature of the hot rolling is 840-900°C; the annealing temperature is 720-780°C, and the annealing time is 45-85s ; The coiling temperature is 580-640°C.

[0040] Among them, hot-rolling temperature and time, annealing temperature and time, and coiling temperature all have a great influence on the strength and elongation of the final hot-dip aluminum-zinc alloy steel sheet. Maintaining a suitable slab heating temperature and furnace time during hot rolling can ensure that alloy elements such as Ti are ...

Embodiment 1

[0072] Embodiment 1 prepares hot-dip aluminum-zinc alloy steel plate with the method of the present invention

[0073] The slab with the chemical composition shown in Table 6 is used as the raw material, heated in a heating furnace at 1240°C, the time in the furnace is 253min, rough rolling for 5 passes, the temperature at the entrance of the finish rolling is 1050°C, and thermal connection through 6 stands Rolling, the final rolling temperature is 871°C, coiled by cooling to 618°C in the front section, and the cooling reduction rate is 72%. Degrease cleaning, annealing, and galvanizing are performed on the continuous hot-dip galvanizing line at a speed of 100m / min. Among them, the free alkalinity of the alkali washing tank is controlled at 75Pt, and the temperature is 80°C; the free alkalinity of the electrolytic cleaning solution is controlled at 75Pt, the temperature is 85°C, and the electrolytic current is controlled at 7000A. The annealing soaking temperature is 754°C, an...

Embodiment 2

[0074] Embodiment 2 prepares hot-dip aluminum-zinc alloy steel plate with the method of the present invention

[0075] A hot-dip aluminum-zinc alloy steel sheet was prepared according to the method in Example 1. The control of different process parameters is shown in Table 7.

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Abstract

The invention belongs to the technical field of clad steel sheet production, particularly relates to a hot-dipped aluminum-zinc alloy steel plate and a preparation method thereof. Aiming at the problems that the hot-dipped aluminum-zinc alloy steel plate produced through the prior art has poor strength, low coating quality and high cost, the invention provides the hot-dipped aluminum-zinc alloy steel plate, and the base material of the steel plate consists of the following components according to weight percentage, 0. 15-0.20% of C, less than or equal to 0.07% of Si, 0.2-0.5% of Mn, 0.02-0.05% of P, less than or equal to 0.015% of S, 0.04-0.06% of Ti, 0.020-0.070% of Al, and the balance of Fe and unavoidable impurities; the preparation method includes the following steps: smelting, hot rolling, cold rolling, cleaning, annealing, hot dipping aluminum-zinc, cooling after hot dipping, finishing, tension levelling, surface treating, greasing, rolling, and getting a product; the heating temperature of a slab during hot rolling is 1230-1260 DEG C and the time in a furnace is 180-300 min; the finish rolling temperature of hot rolling is 840-900 DEG C; the annealing temperature is 720-780 DEG C, and the annealing time is 45-85 s; and the rolling temperature is 580-640 DEG C. The alloy steel plate disclosed by the invention is high in strength, high in ductility, low in coating thickness, uniform and compact in zinc spangle, and high in quality.

Description

technical field [0001] The invention belongs to the technical field of coated steel plate production, and in particular relates to a hot-dip aluminum-zinc alloy steel plate and a preparation method thereof. Background technique [0002] Hot-dip galvanized steel sheet is mainly aimed at products with high corrosion resistance requirements but less complicated deformation, especially for home appliances, construction industry and color-coated substrates. According to the development needs of the market, the hot-dip galvanized sheet is gradually developing towards high strength, thin coating and high surface quality. Hot-dip galvanized sheets with a yield strength of more than 350 MPa for structural purposes are widely used in the fields of home appliance back panels and outer cladding panels for construction plants. The key to its production technology lies in the reasonable design of the substrate composition and process, combined with the hot-dip galvanized process to obtai...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C38/06C22C33/04B21C37/04
CPCC22C38/02B21C37/042C22C33/04C22C38/04C22C38/06C22C38/14
Inventor 许哲峰张功庭郑之旺郑昊青余灿生王敏莉
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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