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High-strength hot-dip galvanized steel sheet

A technology of hot-dip galvanized steel sheet and hot-dip galvanizing, which is applied in hot-dip galvanizing process, heat treatment furnace, heat treatment equipment, etc., can solve problems such as insufficient consideration, and achieve the effect of excellent coating appearance and spot weldability

Active Publication Date: 2019-12-31
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the technology described in Patent Document 1, sufficient consideration has not been given to the plating quality, plating appearance, and spot weldability such as the impact resistance adhesion of the processed part and the corrosion resistance after painting. , need further improvement

Method used

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  • High-strength hot-dip galvanized steel sheet
  • High-strength hot-dip galvanized steel sheet
  • High-strength hot-dip galvanized steel sheet

Examples

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Embodiment

[0114] Hereinafter, the present invention will be specifically described based on examples. In addition, this invention is not limited to the following Example.

[0115] By pickling, the black scale of the hot-rolled steel sheet produced by coiling at a coiling temperature of 650°C or less with the steel composition shown in Table 1 is removed, and the cold rolling is carried out at a cold rolling reduction of 50%. Rolled to produce cold-rolled raw materials with a plate thickness of 1.2mm or 2.3mm. Thereafter, degreasing treatment was performed on the surface, and annealing and hot-dip galvanizing were performed under the conditions shown in Table 2. The line rate (LS) is set to 60mpm or 100mpm. Properly change the bath temperature and Al concentration in the bath. After adjusting the amount of coating deposition, skin pass rolling (SK treatment) is performed. The rolls used in the SK treatment use EDT processing rolls, and the reduction rate is appropriately changed. Adh...

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Abstract

We provide high-strength hot-dip galvanized steel sheets with excellent plating quality, plating appearance, and spot weldability in processed parts. The high-strength hot-dip galvanized steel sheet has: a cold-rolled steel sheet, which is composed of a specific composition, has a structure with a martensite area ratio of 7% or more and less than 25%, and a ferrite area ratio of 50% or more, and the base metal The internal oxidation amount of the surface layer is 0.05g / m per one side 2 The following; intermetallic compounds formed on said cold-rolled steel sheet and containing 0.03 g / m 2 More than 0.12g / m 2 Al below, and Fe with an average particle size of less than 0.7 μm 2 al 5 and a hot-dip galvanized layer, formed on the intermetallic compound, and containing 0.15%≤Al%≤0.30%, wherein in mass %, Al% represents the Al content of the hot-dip galvanized layer, and the hot-dip galvanized layer The surface roughness Ra of the galvanized layer is not less than 0.8 μm and not more than 1.6 μm, the glossiness (G value) is not less than 750 and not more than 850, and the zinc-base plane orientation ratio Zn (002) / (004) is not less than 30% and not more than 60% .

Description

technical field [0001] The present invention relates to a high-strength hot-dip galvanized steel sheet for inner panels of automobiles. Background technique [0002] In recent years, surface-treated steel sheets with antirust properties imparted to raw steel sheets have been used in the fields of automobiles, home appliances, and building materials. Among them, hot-dip galvanized steel sheets that can be produced at low cost and have excellent antirust properties have been used. In particular, European and American automakers believe that by simply increasing the coating thickness of hot-dip galvanized steel sheets, the anti-rust performance can be improved. The situation is that in East Asia, where economic growth is remarkable, large-scale automotive applications can be expected. demand for steel plates. [0003] In the case of a steel sheet for automobiles in which good workability is strictly required, durability cannot be maintained unless the plating quality such as i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06C22C38/00C22C38/12C23C2/26C23C2/40C21D9/46C22C18/04
CPCC23C2/06C23C2/26C23C2/40C21D9/46C22C18/04C22C38/00C23C2/02C22C38/12Y10T428/12583Y10T428/1259Y10T428/12611Y10T428/12618Y10T428/12757Y10T428/12792Y10T428/12799Y10T428/12958Y10T428/12972Y10T428/12993Y10T428/265Y10T428/27B32B15/012C21D8/0226C21D8/0236C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C23C2/024C23C2/022C23C2/29C23C28/02C23C28/021C23C28/023C23C28/025C23C30/00C23C30/005
Inventor 铃木善继
Owner JFE STEEL CORP
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