High-corrosion-resistant magnesium-aluminum-zinc alloy plated steel plate, and two-step annealing preparation method and application thereof

A technology of alloy coating and high corrosion resistance, which is applied in the direction of metal material coating process, coating, manufacturing tools, etc., to achieve the effect of coarse grain size, fast heating rate and uniform recrystallization structure

Inactive Publication Date: 2020-01-10
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of the steel plate produced by this method still has room for further improvement

Method used

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  • High-corrosion-resistant magnesium-aluminum-zinc alloy plated steel plate, and two-step annealing preparation method and application thereof
  • High-corrosion-resistant magnesium-aluminum-zinc alloy plated steel plate, and two-step annealing preparation method and application thereof

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preparation example Construction

[0034] The embodiment of the present invention provides a two-step annealing preparation method for a high corrosion-resistant magnesium-aluminum-zinc alloy coated steel plate, comprising:

[0035] The preliminary formed steel plate after continuous casting and rolling is subjected to bell furnace pre-annealing, electrolytic degreasing, vertical annealing furnace annealing and surface galvanizing in sequence.

[0036] The two-step annealing preparation method of high corrosion-resistant magnesium-aluminum-zinc alloy coated steel plate provided by the embodiment of the present invention adopts BAF bell-type furnace pre-annealing + vertical annealing furnace annealing after continuous casting and rolling, and the bell-type annealing furnace has a slow heating rate , the steel strip has the characteristics of small superheat during the heating and cooling process, and the vertical annealing furnace has the characteristics of fast heating rate and high heating temperature. The comb...

Embodiment 1

[0061] The embodiment of the present invention provides a two-step annealing preparation method of high corrosion resistance magnesium-aluminum-zinc alloy coated steel plate, the specific process is as follows:

[0062] Blast furnace molten iron smelting, converter molten steel smelting, LF molten steel refining treatment, RH molten steel refining treatment, CSP thin slab continuous casting and rolling, pickling cold continuous rolling, bell furnace pre-annealing, electrolytic degreasing, vertical annealing furnace annealing, zinc pot coating Plating, post-plating cooling, skin pass and straightening, passivation, drying, electrostatic oiling and coiling.

[0063] After RH molten steel refining treatment, the refined substrate is obtained, and the chemical composition is as follows in terms of mass percentage: [C]: 0.0050Wt%; [Si]: 0.18Wt%; [Mn]: 0.17Wt%; [P]: 0.0150Wt% ; [S]: 0.0100Wt%; [Als]: 0.0462Wt%; [Ti+Nb]: 0.0775Wt%.

[0064] CSP thin slab continuous casting and rolli...

Embodiment 2

[0072] The embodiment of the present invention provides a two-step annealing preparation method of high corrosion resistance magnesium-aluminum-zinc alloy coated steel plate, the specific process is as follows:

[0073] Blast furnace molten iron smelting, converter molten steel smelting, LF molten steel refining treatment, RH molten steel refining treatment, CSP thin slab continuous casting and rolling, pickling cold continuous rolling, bell furnace pre-annealing, electrolytic degreasing, vertical annealing furnace annealing, zinc pot coating Plating, post-plating cooling, skin pass and straightening, passivation, drying, electrostatic oiling and coiling.

[0074] After RH molten steel refining treatment, the refined substrate is obtained, and the chemical composition is as follows in terms of mass percentage: [C]: 0.0047Wt%; [Si]: 0.20Wt%; [Mn]: 0.20Wt%; [P]: 0.0099Wt% ; [S]: 0.0085Wt%; [Als]: 0.030Wt%; [Ti+Nb]: 0.088Wt%.

[0075] CSP thin slab continuous casting and rolling...

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Abstract

The invention relates to the technical field of steelmaking, and discloses a two-step annealing preparation method of a high-corrosion-resistant magnesium-aluminum-zinc alloy plated steel plate. The two-step annealing preparation method comprises the steps that a preliminary molded steel plate obtained after continuous casting and rolling is sequentially annealed in a bell-type furnace, suffers electrolytic degreasing, is annealed in a vertical type annealing furnace and surfaces surface galvanizing. The invention also provides the high-corrosion-resistant magnesium-aluminum-zinc alloy platedsteel plate prepared by the method. The steel plate has good surface stability, good corrosion resistance, and good stamping formability. The invention also discloses an application of the steel platein the field of iron and steel product production or construction.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a high-corrosion-resistant magnesium-aluminum-zinc alloy coated steel plate and a two-step annealing preparation method and application thereof. Background technique [0002] Hot and high corrosion-resistant magnesium-aluminum-zinc alloy coated steel sheet has good corrosion resistance and processability, and is widely used in construction, home appliances and automobile manufacturing. The corrosion resistance of the high-corrosion-resistant magnesium-aluminum-zinc alloy-coated steel sheet is proportional to the thickness of the coating, and improving the corrosion resistance of the high-corrosion-resistant magnesium-aluminum-zinc alloy coated steel sheet will consume more zinc resources. In order to improve the corrosion resistance, in recent years people have developed galvanizing on the surface of the steel plate to improve the surface properties of the steel plate. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D1/74C21D9/52C23C2/02C23C2/06C23C2/40C22C18/04
CPCC21D1/26C21D1/74C21D9/52C22C18/04C23C2/02C23C2/06C23C2/40
Inventor 杜昕赵小龙董世文罗晓阳田成辉王瑾刘晓华
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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