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High-strength hot-dip-galvanized steel sheet

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

Active Publication Date: 2017-08-18
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

[0113] Hereinafter, the present invention will be specifically described based on examples. In addition, this invention is not limited to the following Example.

[0114] 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

Provided is a high-strength hot-dip-galvanized steel sheet exhibiting excellent plating adhesion in worked sections, excellent plating appearance, and excellent spot weldability. The present invention is provided with: a cold-rolled steel sheet which comprises a specific composition, is provided with a structure having a martensite area ratio of at least 7% but less than 25%, and a ferrite area ratio of at least 50%, and has an internal oxidation amount in a ferrite surface layer section of not more than 0.05 g / m2 per surface; an intermetallic compound which is formed on the cold-rolled steel sheet, includes at least 0.03 g / m2 but not more than 0.12 g / m2 of Al, and includes Fe2Al5 having an average grain size of less than 0.7 [mu]m; and a hot-dip-galvanized layer which is formed on the intermetallic compound, satisfies 0.15%<=Al%<=0.30% (Al% indicates the content (mass%) of Al in the hot-dip-galvanized layer), and has a surface roughness (Ra) of 0.8-1.6 [mu]m inclusive, a glossiness (G value) of 750-850 inclusive, and a zinc-basal-plane orientation ratio (Zn(002) / (004)) of 30-60% inclusive.

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 Applications(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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