High-manganese hot-dip aluminum-coated steel sheet having excellent coating adhesion

A hot-dip aluminum and steel plate technology, applied in hot-dip plating process, coating, layered products, etc., can solve the problems of reduced ductility and increased cost, and achieve the effect of excellent coating adhesion

Active Publication Date: 2018-08-21
POSCO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most steel plates show an inverse relationship in ductility as strength increases, thus limiting processing along with cost increases

Method used

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  • High-manganese hot-dip aluminum-coated steel sheet having excellent coating adhesion
  • High-manganese hot-dip aluminum-coated steel sheet having excellent coating adhesion
  • High-manganese hot-dip aluminum-coated steel sheet having excellent coating adhesion

Examples

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Embodiment approach

[0076] Hereinafter, the present invention will be described more specifically through examples. However, the following examples are for illustration and concrete description of the present invention, and do not limit the scope of rights of the present invention. This is because the scope of rights of the present invention is determined by the matters described in the claims and matters reasonably derived therefrom.

[0077] A steel slab having the composition shown in Table 1 below was heated to a temperature of 1200° C., hot-rolled at 860° C., coiled at 620° C., and then air-cooled to obtain a hot-rolled steel sheet. After that, oxides on the surface of the hot-rolled steel sheet were removed with a hydrochloric acid solution, and then cold-rolled at a cold reduction ratio of 70% to obtain a cold-rolled steel sheet of 1.2 mm. Afterwards, at 800°C in N 2 -10vol%H 2After the cold-rolled steel sheet was annealed for 90 seconds in an atmosphere, it was immersed in an aluminum-...

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Abstract

Disclosed is a high-manganese hot-dip aluminum-coated steel sheet comprising: a base steel sheet containing, by weight, 5% to 35% of Mn, 0.3% to 6% of Al, 0.1% to 1.2% of Si, and the balanced amount of Fe and inevitable impurities; a hot-dip aluminum-coated layer, formed on a surface of the base steel sheet, containing, by weight, 3% to 12% of Si and the balanced amount of Al and inevitable impurities; and an alloy layer, 0.1-10 um in thickness with a Fe-Al-Si-Mn alloy phase on an interface between the base steel sheet and the hot-dip aluminum-coated layer, containing, by weight, 40% to 70% ofAl, 2% to 13% of Si, 3% to 9% of Mn, and the balanced amount of Fe and inevitable impurities.

Description

technical field [0001] The present invention relates to a high-manganese hot-dipped aluminum-based plated steel sheet excellent in plated adhesion. Background technique [0002] In order to improve the fuel efficiency of automobiles, the weight reduction of automobile bodies has become a very important issue. To meet this requirement, various types of high-strength steels for automobiles have been developed. Most steel plates show an inverse relationship in ductility as strength increases, so processing is limited and costs rise. Therefore, many studies on improving the ductility of high-strength steel have been carried out, and a method of adding 5 to 35% manganese to steel is proposed to induce twinning (TWIP) during plastic deformation, thereby greatly improving ductility. Austenitic twinning induced plasticity steel (Twinning InducedPlasticity, TWIP). [0003] In addition, manganese is an element with a high ionization tendency, and steel with high manganese content c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/06C22C38/02C22C38/28C22C38/24C22C38/22C23C2/12C23C2/40
CPCC23C2/40C22C38/02C22C38/04C22C38/06B32B15/012C22C38/008C22C38/12C22C38/14C22C38/38C23C2/12C22C38/002C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C23C2/261C23C2/29Y10T428/12757
Inventor 金兴润黄铉锡金泳河
Owner POSCO CO LTD
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