Coated steel sheet with thin aluminum alloy coating and coating method thereof
A technology for coating steel plates and aluminum alloys, which is applied in the direction of metal material coating process, coating, hot-dip plating process, etc., to achieve the effect of improving resistance spot welding performance, stabilizing coating thickness and shortening residence time
Active Publication Date: 2020-08-28
IRONOVATION MATERIALS TECH CO LTD
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Problems solved by technology
[0004] However, the inventors of the present application have found that even with a thin initial coating, there is still room for further improvement in resistance spot welding performance
Method used
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Effect test
Embodiment 5
[0079] The coating process parameters of Example 5 and Comparative Example 4 are only different in the temperature of the steel plate entering the pot, and Comparative Example 4 has a significantly higher temperature of the steel plate entering the pot. Therefore, more Kirkendall holes and a thicker FeAlSi suppression layer in Comparative Example 4 are due to the high temperature of the steel plate entering the pan. It can be seen that the high steel plate entering the pot temperature is undesirable.
[0080] image 3 It is a photo of a typical missing coating defect of the coated steel plate of Comparative Example 4. It can be clearly seen that in some areas, the miss plating situation is serious. This is because compared with Example 5, the higher temperature of the steel plate in Comparative Example 4 accelerates the diffusion, so that the generated FeAlSi inhibition layer is thicker, and the corresponding Al alloy layer is thinner, so the requirements for air knife purgi...
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Abstract
The present invention relates to a coated steel sheet with a thin aluminum alloy coating and a coating method thereof. The coated steel sheet of the present invention is used for hot stamping forming, and the coating thickness of the coated steel sheet is 5 ~ 14 μ m, wherein, the aluminum alloy coating comprises the FeAlSi suppression layer near the base steel sheet and the Al alloy layer on its outside, wherein, the FeAlSi suppression layer The thickness is not more than 60% of the coating thickness and is 1.5~6.0μm, and the diameter of the Kirkendall hole within 2μm from the interface of the FeAlSi suppression layer and the base steel to the base steel is less than 2.5μm, and the diameter is above 0.5μm and The number of Kirkendall pores below 2.5 μm does not exceed 15 per 35 μm. The invention also discloses a coating method for coating a thin aluminum alloy coating on a base steel plate for hot stamping, which can eliminate missed coating and make the hot stamping formed member obtained from the coated steel plate have excellent resistance spot welding performance.
Description
technical field [0001] The present invention relates to a coated steel sheet with a thin aluminum alloy coating and a coating method thereof. Background technique [0002] In recent years, with the increasingly stringent requirements for energy, environmental protection, collision regulations, and passenger passive safety, hot stamping has been increasingly applied to the design and manufacture of automotive components. In order to improve the strength and toughness of hot stamping components of aluminum-silicon coated sheets, CN108588612A proposes to use thin coated sheets to obtain hot stamped components, wherein the initial coating thickness of the coated steel sheets before hot stamping is 3-19 μm. However, in the production of thin-coated boards, it is found that the problems of large fluctuations in coating thickness, unstable production and partial missing plating are prone to occur during the production process. [0003] In addition, during the hot stamping process,...
Claims
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IPC IPC(8): C23C2/12C22C21/02C23C2/02C23C2/20C22C38/02C22C38/04C22C38/06C22C38/38C22C38/24C22C38/26C22C38/28C22C38/32C22C38/34C22C38/20C22C38/22C22C38/40C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18
CPCC23C2/12C22C21/02C23C2/02C23C2/20C22C38/02C22C38/04C22C38/06C22C38/38C22C38/24C22C38/26C22C38/28C22C38/32C22C38/34C22C38/20C22C38/22C22C38/40C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18C23C2/26C23C2/29C21D9/46B32B15/012C21D8/0205C21D8/0278C23C2/0224B21D22/022C23C30/00C23C28/02C23C30/005B32B15/04C23C28/023B32B15/18B32B15/043C23C28/021B32B15/20C22C21/00Y10T428/2495Y10T428/265Y10T428/24959Y10T428/264Y10T428/12472Y10T428/12979Y10T428/12951Y10T428/24975Y10T428/12958Y10T428/12764Y10T428/12972Y10T428/12736Y10T428/24967Y10T428/26Y10T428/12757Y10T428/24942Y10T428/12438Y10T428/263Y10T428/12451
Inventor 易红亮周澍熊小川
Owner IRONOVATION MATERIALS TECH CO LTD