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Aluminum plated steel plate having excellent coating performance and used in hot formed part, manufacturing method thereof and hot formed part

A manufacturing method and thermoforming technology, applied in hot dip plating process, superimposed layer plating, coating and other directions, can solve the problem of phosphating film cannot be formed, reduce the probability of infiltration of micro-cracks, and improve the adhesion of the coating. Adhesion, the effect of eliminating uneven appearance

Active Publication Date: 2020-08-25
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the Al-Si coating is in contact with the air during the thermoforming process to form a silicon oxide film covering the surface. This layer of oxide cannot be dissolved by phosphoric acid, resulting in the inability to form a phosphating film.
Therefore, Al-Si coated hot-formed steel parts cannot form a good-quality phosphating film to ensure the adhesion and corrosion resistance of the electrophoretic paint layer when they are loaded and painted.

Method used

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  • Aluminum plated steel plate having excellent coating performance and used in hot formed part, manufacturing method thereof and hot formed part
  • Aluminum plated steel plate having excellent coating performance and used in hot formed part, manufacturing method thereof and hot formed part
  • Aluminum plated steel plate having excellent coating performance and used in hot formed part, manufacturing method thereof and hot formed part

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with examples.

[0032] Through molten iron pretreatment→converter smelting→alloy fine-tuning→refining→continuous casting→hot rolling→pickling→cold rolling→get cold-rolled strip steel with a thickness of 1.2-2.5mm for each composition in Table 1, and then each cold-rolled strip steel After cleaning→continuous annealing→hot-dip plating→coating thickness control→alloying→cooling→oiling and controlling according to the parameters in Table 2-3, aluminum-coated steel sheets were prepared.

[0033] Table 1 is the substrate chemical composition and weight percentage (wt%) in each embodiment and comparative example

[0034]

[0035]

[0036] Plating solution chemical composition and weight percent (wt %) in each embodiment of table 2 and comparative example

[0037] Si Sn+Cu+Mo Al Example 1 3.0 0.5 margin Example 2 3.5 1.5 margin Example 3 5.0 1.8 margin ...

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Abstract

The invention discloses an aluminum plated steel plate having excellent coating performance and used in a hot formed part, a manufacturing method thereof and a hot formed part. The manufacturing method comprises the following steps of cold rolled strip steel washing, continuous annealing, hot dip coating, plating thickness control, alloying, cooling and oil coating. A plating solution used by hotdip coating comprises, by weight percentage, 3.0-6.0% of Si, total content 0.5-2.5% of one or more of Sn, Cu and Mo, and the rest Al and inevitable impurity. The aluminum plated steel plate is used for manufacturing the hot formed part, the uneven paint appearance caused by micro-crack forming is eliminated, and the later corrosion resistance of the paint is improved.

Description

technical field [0001] The invention belongs to the technical field of thermoformed steel, and in particular relates to an aluminized steel plate for thermoformed parts with excellent coating performance, a manufacturing method thereof, and a thermoformed part. Background technique [0002] In recent years, the strict laws and regulations on energy saving and emission reduction have put forward higher requirements for the lightweight of the car body. In order to reduce the weight of the car body while maintaining safety performance, high-strength parts are widely used in the manufacture of car bodies. Due to the springback effect of cold-formed ultra-high-strength steel in the stamping process, the application of ultra-high-strength steel in car body is limited. Thermoforming technology has been widely used and popularized due to its high dimensional accuracy, no springback effect, and high strength level. [0003] In the hot stamping process, the use of uncoated plates re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C23C2/26C23C2/28C23C2/40C23C22/00C23C28/00C25D13/12
CPCC23C2/06C23C2/28C23C2/26C23C2/40C23C22/00C25D13/12C23C28/3225
Inventor 李子涛晋家春计遥遥周世龙崔磊张军王辉王伟峰刘东亚成昌晶
Owner MAANSHAN IRON & STEEL CO LTD
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