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High-strength hot-dipped galvanized steel sheet having excellent plating adhesion, and method for producing same

A technology of hot-dip galvanized steel sheet and coating adhesion, which is applied in hot-dip coating technology, manufacturing tools, heat treatment furnaces, etc., can solve the problem that the effect cannot be obtained stably, and achieve excellent fatigue resistance and coating adhesion excellent effect

Active Publication Date: 2014-02-12
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-dipped galvanized steel sheet having excellent plating adhesion, and method for producing same
  • High-strength hot-dipped galvanized steel sheet having excellent plating adhesion, and method for producing same
  • High-strength hot-dipped galvanized steel sheet having excellent plating adhesion, and method for producing same

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 ...

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 coating layer and from the surface layer of the steel sheet under the coating layer to the 5 μm inside of t...

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 the 5 μm inside of the steel sheet was carried out, and the a...

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Abstract

Provided are: a high-strength hot-dipped galvanized steel sheet which uses, as a base material, a high-strength steel sheet containing Si, Mn and Cr and has excellent plating adhesion; and a method for producing the high-strength hot-dipped galvanized steel sheet. In an oxidation furnace, steel containing Si, Mn and Cr is subjected to an oxidation treatment at an exit side temperature (T), and then the steel is subjected to reduction annealing and hot dip galvanization. Alternatively, the steel is alloyed by being heated to a temperature of 460-600 DEG C for 10-60 seconds. In this connection, the exit side temperature (T) satisfies the following conditions: A = 0.015T-7.6 (T>=507 DEG C) A=0 (T<507 DEG C) B=0.0063T-2.8 (T>=445 DEG C) B=0 (T<445 DEG C) [Si]+A*[Cr]<=B, wherein [Si]: mass% of Si in the steel [Cr]: mass% of Cr in the 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 Applications(China)
IPC IPC(8): C23C2/02C21D9/46C22C38/00C22C38/18C22C38/58C23C2/06C23C2/28
CPCC23C2/28C23C2/06C21D8/0473C22C38/04C23C2/02C22C38/38C22C38/34C21D8/0478C21D9/48C22C38/02Y10T428/12799C23C2/0222C23C2/0038C23C2/0224C23C2/026C23C2/522C21D9/46C22C38/00C22C38/18C22C38/58C23C2/29
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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