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A local strengthened hot-rolled galvanized aluminum steel sheet and its manufacturing method

A technology for local strengthening, hot-rolled steel sheets, applied in chemical instruments and methods, pressure inorganic powder coating, layered products, etc. and other problems, to avoid the formation of excessive brittle phases at the interface, improve the coordination deformation ability, and achieve the effect of high efficiency

Active Publication Date: 2017-09-22
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned technologies, there are generally high requirements for the original plate, and the preparation of the zinc-aluminum alloy coating on the surface of the hot-rolled plate cannot be realized.
As we all know, the interface treatment between the coating and the substrate is the weakest link in the coating technology. In the above-mentioned technologies, the interface is mainly used to prepare the transition metal layer or the method of mechanical over-roughening to improve the adhesion between the coating and the substrate. The preparation of the transition layer Increases the complexity of the coating process

Method used

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  • A local strengthened hot-rolled galvanized aluminum steel sheet and its manufacturing method
  • A local strengthened hot-rolled galvanized aluminum steel sheet and its manufacturing method
  • A local strengthened hot-rolled galvanized aluminum steel sheet and its manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The substrate is hot-rolled IF steel with a thickness of 4mm. Substrate surface pretreatment adopts gas-solid two-phase flow composed of compressed air and alumina balls, high-speed bombardment to remove surface oxide skin, obtain surface grain size of 30nm, roughness of Ra1.2μm surface, fine-grained layer thickness of 15μm, surface hardness of 2.1 GPa, the hardness of the core is 1.6GPa, the change trend of the hardness of the steel plate from the surface to the core is as follows image 3 As shown, the introduction of hardness difference on the surface improves the coordination of deformation of steel plate substrate and coating. A 100 μm zinc-aluminum alloy coating is deposited by cold spraying on the surface of the above-mentioned pretreated steel plate, and the cross-sectional morphology of the cold sprayed coating is as follows Figure 4 As shown, the driving gas and carrier gas are industrial nitrogen, and the pressure is 2.2MPa. The particle size range of the p...

Embodiment 2

[0042] The substrate is hot-rolled Q235 steel with a thickness of 2mm. Substrate surface pretreatment adopts gas-solid two-phase flow composed of compressed air and cast steel shot, high-speed bombardment to remove surface oxide skin, obtain surface grain size of 27nm, roughness of Ra2.0μm surface, fine-grained layer thickness of 25μm, surface hardness of 2.5 GPa, the core hardness is 1.8GPa. 200μm zinc-aluminum alloy coating is deposited by cold spraying on the surface of the above-mentioned pretreated steel plate, the driving gas and carrier gas are industrial nitrogen, the pressure is 2.5MPa, the particle size range of the powder raw material used is 15-50μm, the proportion is 52%, and the proportion of 50-80μm 28%, the remaining particles are 80-100μm, and the powder feeding rate is 290g / min. The above-mentioned galvanized aluminum Q235 steel plate is heat treated, the environment is a hydrogen reducing atmosphere, the heat treatment temperature is 450°C, the holding time...

Embodiment 3

[0044] The substrate is hot-rolled Q345 steel with a thickness of 10mm. Substrate surface pretreatment adopts gas-solid two-phase flow composed of compressed air and stainless steel wire cut shot, high-speed bombardment to remove surface oxide skin, obtain surface grain size of 0.95μm, roughness of Ra1.8μm surface, fine-grained layer thickness of 50μm, surface The hardness is 2.8GPa, and the core hardness is 2.0GPa. A 50μm zinc-aluminum alloy coating is deposited by cold spraying on the surface of the above-mentioned pretreated steel plate, the driving gas and carrier gas are industrial nitrogen, the pressure is 0.8MPa, and the particle size range of the powder raw materials used is 15-50μm. The proportion is 63%, and the proportion of 50-80μm 24%, the remaining particles are 80-100μm, and the powder feeding rate is 55g / min. Carry out heat treatment on the above-mentioned galvanized aluminum Q345 steel plate, the environment is a hydrogen reducing atmosphere, the heat treatme...

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Abstract

The invention discloses a locally reinforced hot-rolled aluminum-zinc plated steel plate and a manufacturing method thereof. The locally reinforced hot-rolled aluminum-zinc plated steel plate comprises a matrix and a plating, wherein the interface between the plating and the matrix of the zinc-aluminum plated steel plate comprises a non-continuously distributed and locally diffused reinforced zone composed of an iron-zinc compound and an iron-aluminum compound. Compared with a normal hot-dipping zinc plated or zinc-aluminum plated plate, by controlling the formation and distribution of the metal compounds in the interface, the local interface reinforced zone is formed and has relative good adhesion strength and forming performance. The manufacturing method comprises the steps of pre-treatment of the hot-rolled steel plate, cold spraying of zinc-aluminum and post thermal treatment. By adopting the method, the effects of acidless descaling as well as fining and roughening of surface grains are synchronously realized; the method is high in efficiency, slight in pollution and environment-friendly; the plating is strong in adaptability and wide in product range.

Description

technical field [0001] The invention relates to the field of surface protection of steel plate products, in particular to a locally strengthened galvanized aluminum alloy hot-rolled strip and a manufacturing method thereof. Background technique [0002] Galvanizing or zinc alloy plating on the surface of steel plate products is one of the most commonly used and effective protection methods, and it is widely used in industry, especially in the automobile and home appliance industries. With the development of electric power, railway and military industries and the continuous improvement of surface protection performance, pure galvanized products can no longer meet the requirements in terms of corrosion resistance and mechanical properties. Galvalume (55%Al-43.4%Zn-1.6%Si ) and Galfan (zinc-5%Al0.1%RE) represented by hot-dip galvanized aluminum alloy has gradually become the main direction of hot-dip industry development. The zinc-aluminum alloy coating combines the advantages...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/01C23F17/00C23C24/04C21D8/02
Inventor 梁永立杨晓萍史弼张宇军张俊宝
Owner BAOSHAN IRON & STEEL CO LTD
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