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High-strength hot-dip galvanized steel sheet excellent in coating adhesion and manufacturing method thereof

A hot-dip galvanized steel sheet, coating and sealing technology, applied in hot-dip coating process, manufacturing tools, heat treatment furnaces, etc. Excellent effect

Active Publication Date: 2017-02-15
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in Patent Document 1, the effect cannot be obtained stably

Method used

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  • High-strength hot-dip galvanized steel sheet excellent in coating adhesion and manufacturing method thereof
  • High-strength hot-dip galvanized steel sheet excellent in coating adhesion and manufacturing method thereof
  • High-strength hot-dip galvanized steel sheet excellent in coating adhesion and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] The cast slabs obtained by melting the steels having the chemical components shown in Table 1 were hot-rolled, pickled, and then cold-rolled to form cold-rolled steel sheets with a thickness of 1.2 mm.

[0122] [Table 1]

[0123] (quality%)

[0124] steel mark C Si mn Cr P S A 0.03 0.5 2.0 0.1 0.01 0.001 B 0.05 1.0 2.0 0.1 0.01 0.001 C 0.07 1.2 1.9 0.1 0.01 0.001 D 0.08 1.5 1.2 0.2 0.01 0.001 E 0.09 1.5 2.3 0.2 0.01 0.001 F 0.12 1.5 2.5 0.2 0.01 0.001 G 0.09 1.5 1.4 0.02 0.01 0.001 H 0.08 1.5 2.7 0.02 0.01 0.001 I 0.11 1.5 2.7 0.02 0.01 0.001 J 0.09 1.0 1.8 0.6 0.01 0.001 K 0.11 2.3 1.9 0.2 0.01 0.001 L 0.12 1.2 3.2 0.1 0.01 0.001

[0125] Thereafter, the above-mentioned cold-rolled steel sheet was heated by appropriately changing the outlet temperature of the oxidation furnace by a CGL having a DFF type oxidation furnace. The di...

Embodiment 2

[0139] The cast slabs obtained by melting the steels having the chemical components shown in Table 1 were hot-rolled, pickled, and then cold-rolled to form cold-rolled steel sheets with a thickness of 1.2 mm.

[0140] Thereafter, oxidation treatment and reduction annealing were carried out in the same manner as in Example 1. In addition, the amount of coating was adjusted to about 50 g / m by the gas friction contact method after performing hot-dip plating in a galvanizing bath at 460°C with the added amount of Al adjusted to 0.13%. 2 , alloying treatment was carried out at the predetermined temperature shown in Table 3 for 20 to 30 seconds.

[0141] For the hot-dip galvanized steel sheet obtained as described above, the amount of plating deposition and the Fe content in the plating layer were determined. In addition, quantification of Si and Mn of oxides contained in the plating layer and from the surface layer of the steel sheet under the plating layer to the steel sheet with...

Embodiment 3

[0157] The cast slabs obtained by melting the steels having the chemical components shown in Table 1 were hot-rolled, pickled, and then cold-rolled to form cold-rolled steel sheets with a thickness of 1.2 mm.

[0158] Thereafter, oxidation treatment, reduction annealing, plating, and alloying treatment were performed in the same manner as in Example 2. However, among these, the inside of the oxidation furnace is divided into three areas, and the temperature on the outlet side and the oxygen concentration in the atmosphere are adjusted by variously changing the respective combustion rates and air ratios.

[0159] For the hot-dip galvanized steel sheet obtained as described above, the plating deposition amount and the Fe content in the plating layer were determined. Furthermore, quantification of Si and Mn of oxides contained in the coating layer and from the surface layer of the steel sheet under the coating layer to 5 μm inside the steel sheet was carried out, and the appearan...

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Abstract

The present invention provides a high-strength hot-dip galvanized steel sheet that uses a high-strength steel sheet containing Si, Mn, and Cr as a base material and has excellent plating adhesion and a method for producing the same. Steel containing Si, Mn, and Cr is oxidized at the exit temperature T in an oxidation furnace, followed by reduction annealing and hot-dip galvanizing. Or further alloying treatment is carried out by heating at a temperature of 460-600° C. for 10-60 seconds. The above outlet temperature T satisfies the following relationship: A=0.015T‑7.6 (T≥507°C) A=0 (T<507°C) B=0.0063T‑2.8 (T≥445°C) B=0 (T<445°C) °C) [Si]+A×[Cr]≦B, where [Si]: Si mass % in steel [Cr]: Cr mass % in steel.

Description

technical field [0001] The present invention relates to a high-strength hot-dip galvanized steel sheet that uses a high-strength steel sheet containing Si, Mn, and Cr as a base material and is excellent in coating adhesion, and relates to a method for producing the same. Background technique [0002] In recent years, in the fields of automobiles, home appliances, building materials, etc., surface-treated steel sheets that impart rust resistance to material steel sheets have been used. Among them, hot-dip galvanized steel sheets and alloyed hot-dip galvanized steel sheets that are excellent in rust resistance have been used. In addition, from the viewpoint of reducing fuel consumption and improving the safety of automobile collisions, it is attempted to achieve thinner wall thickness by increasing the strength of car body materials, and in order to make the car body itself lighter and stronger, high-strength steel plates are application has been promoted. [0003] In general...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/02C21D9/46C22C38/00C22C38/18C22C38/58C23C2/06C23C2/28
CPCC23C2/06C23C2/28C21D8/0473C21D8/0478C21D9/48C22C38/02C22C38/04C22C38/34C22C38/38Y10T428/12799C23C2/02C23C2/0222C23C2/0038C23C2/0224C23C2/026C23C2/522C21D9/46C22C38/00C22C38/18C22C38/58C23C2/29
Inventor 牧水洋一铃木善继永野英树金子真次郎
Owner JFE STEEL CORP
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