Hot-dip-galvanized steel sheet

A hot-dip galvanized steel sheet, hot-dip galvanized technology, applied in hot-dip galvanizing process, heat treatment furnace, heat treatment equipment, etc., can solve the problems of insufficient consideration of coating adhesion, corrosion resistance, durability, etc., and achieve excellent Effects of corrosion resistance after painting, excellent appearance after painting, and excellent spot weldability

Active Publication Date: 2015-08-12
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in Patent Document 1, the durability of the product, such as the plating adhesion of the processed part after press working and the corrosion resistance after press working, is not considered sufficiently.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0074] Hereinafter, the present invention will be specifically described based on examples. It should be noted that the present invention is not limited to the following examples.

[0075] After removing the black scale of the hot-rolled steel sheet by pickling, cold rolling is carried out with a reduction ratio of 65%, so that the plate thickness is 0.8mm and 1.8mm. This hot-rolled steel sheet has the steel composition shown in Table 1, and is shown in Table 2 ( The table consisting of Table 2-1 and Table 2-2 was coiled at a finish rolling temperature and a coiling temperature of 650° C. or less shown in Table 2). Thereafter, the surface was degreased on the input side of the CGL (continuous galvanizing line), annealed and galvanized under the conditions shown in Table 2 to manufacture galvanized steel sheets. The bath temperature and the Al concentration in the bath were appropriately changed. EDT processed rolls were used for the rolls, and the rolling reduction was appro...

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Abstract

Provided is a hot-dip-galvanized steel sheet which exhibits excellent appearance, post-pressing plating adhesion, spot-welding properties, and post-pressing / post-coating corrosion resistance. This hot-dip-galvanized steel sheet has a yield stress (YS) of 260-350MPa, inclusive, and has: a steel sheet comprising a composition containing, in mass%, C in the amount of 0.05-0.1%, inclusive, Si in the amount of 0.10% or less, Mn in the amount of 0.30-0.70%, inclusive, P in the amount of 0.040% or less, S in the amount of 0.010% or less, N in the amount of 0.005% or less, and Al in the amount of 0.10% or less, with Fe and inevitable impurities constituting the remainder; a hot-dip galvanized layer containing Al in the amount of 0.3-0.6 mass%, inclusive, and formed on at least part of the surface of the steel sheet; and an intermetallic compound present between the steel sheet and the hot-dip galvanized layer, and containing Al in the amount of 0.12gm-2 to 0.22gm-2, inclusive, and Fe2Al5 having an average particle diameter of 1μm or less.

Description

technical field [0001] The present invention relates to a hot-dip galvanized steel sheet applicable to outer panels and inner panels of automobiles. Background technique [0002] In recent years, surface-treated steel sheets that impart rust resistance to material steel sheets have been used in the fields of automobiles, home appliances, and building materials. Among them, hot-dip galvanized steel sheets that are excellent in rust resistance have been used. In particular, European and American automakers are considering improving rust resistance by applying hot-dip galvanized steel sheets that simply increase the coating thickness. In addition, in East Asia, where the economy is growing rapidly, a huge demand for steel sheets for automobiles is expected. [0003] In addition, in the case of steel sheets for automobiles in which good workability is strictly required, the durability of the product cannot be maintained if the plating adhesion after press working and the corros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C21D9/46C22C38/00C22C38/06C23C2/40
CPCC21D9/46C22C38/02C22C18/04C22C38/04B32B15/013C23C28/345C23C28/321C23C2/06C22C38/06C23C2/02C22C38/001C22C38/00C22C38/002C23C2/40C23C2/024C23C2/022
Inventor 铃木善继宫田麻衣长泷康伸
Owner JFE STEEL CORP
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