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High-strength hot-dip zinced steel sheet excellent in moldability and suitability for plating, high-strength alloyed hot-dip zinced steel sheet, and processes and apparatus for producing these

一种热浸镀锌钢板、高强度钢板的技术，应用在热浸镀工艺、化学仪器和方法、制造工具等方向，能够解决不能充分确保镀覆密合性、空间不能采用、没有各种性能提高等问题

Active Publication Date: 2008-12-31
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in JP-A-2001-323355, JP-A-2003-105516, and JP-A-2004-323970, although it is possible to ensure plating adhesion to the extent that it does not peel off in a bending test, it is not sufficient. Securing plating adhesion for strict evaluation such as DuPont impact test
[0015] In addition, in the pre-plating method described in JP-A-56-33463 and JP-A-57-79160, since plating equipment is required, it cannot be adopted if there is no space for it.
In addition, there is a problem that the production cost increases due to the installation of pre-plating equipment
In addition, the secondary annealing described in JP-A-2002-161315 also has the problem of increased production cost.
[0016] In addition, the production technology of the Si-containing steel sheet disclosed before places emphasis on ensuring the platability, and there has been no consideration of the formability and the like when using it as a plated steel sheet. performance improvement

Method used

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  • High-strength hot-dip zinced steel sheet excellent in moldability and suitability for plating, high-strength alloyed hot-dip zinced steel sheet, and processes and apparatus for producing these
  • High-strength hot-dip zinced steel sheet excellent in moldability and suitability for plating, high-strength alloyed hot-dip zinced steel sheet, and processes and apparatus for producing these
  • High-strength hot-dip zinced steel sheet excellent in moldability and suitability for plating, high-strength alloyed hot-dip zinced steel sheet, and processes and apparatus for producing these

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0182] A slab having the composition in Table 1 was heated to 1423K, rolled at a finish rolling temperature of 1183K to 1203K to form a 4.5mm hot-rolled steel strip, and coiled at 853K to 953K. After pickling, cold rolling is carried out, and after being rolled into a 1.6mm cold-rolled steel strip, the continuous hot-dip galvanizing equipment of the annealing method in the production line is used to perform coating under the conditions shown in Table 2 to form an alloyed hot-dip galvanizing equipment. Galvanized steel. As a continuous hot-dip galvanizing facility, after heating in a non-oxidizing furnace, reduction and annealing are performed in a reduction zone. Adjust the combustion air ratio of the non-oxidizing furnace to 1.0 and use it as an oxidation zone. The reduction belt is installed there for making a mixture of CO and H 2 The gas combustion and introduction of H produced 2 O.CO 2 device, the H 2 O and CO 2 introduced to contain 10 vol% H 2 N 2 in the gas. ...

Embodiment 2

[0212] A slab having the composition in Table 1 was heated to 1423K, rolled at a finish rolling temperature of 1183K to 1203K to form a 4.5mm hot-rolled steel strip, and coiled at 853K to 953K. After pickling, cold rolling is carried out, and after being rolled into a 1.6mm cold-rolled steel strip, the continuous hot-dip galvanizing equipment of the annealing method in the production line is used to perform the coating under the conditions shown in Table 3 to form alloyed hot-dip galvanizing equipment. Galvanized steel. As a continuous hot-dip galvanizing facility, after heating in a non-oxidizing furnace, reduction and annealing are performed in a reduction zone. The dew point of the area heated by the non-oxidizing furnace and its residual heat is adjusted to 283K, and it is used as an oxidation zone. The reduction belt is installed there for making a mixture of CO and H 2 The gas combustion and introduction of H produced 2 O.CO 2 device, the H 2 O and CO 2 introduced ...

Embodiment 3

[0241] A slab having the composition shown in Table 1 was heated to 1423K, rolled at a finish rolling temperature of 1183K to 1203K to form a 4.5mm hot-rolled steel strip, and coiled at 853K to 953K. After pickling, cold rolling is carried out, and after being rolled into a 1.6mm cold-rolled steel strip, the continuous hot-dip galvanizing equipment of the annealing method in the production line is used to carry out the coating under the conditions shown in Table 4 to form alloyed hot-dip galvanizing equipment. Galvanized steel. As a continuous hot-dip galvanizing facility, after heating in a non-oxidizing furnace, reduction and annealing are performed in a reduction zone. The dew point of the area heated by the non-oxidizing furnace and its residual heat is adjusted to 283K, and a device for mixing CO and H is installed in the reduction zone. 2 The gas combustion and introduction of H produced 2 O.CO 2 device, the H 2 O and CO 2 introduced containing 10 vol% H 2 N 2 In ...

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Abstract

The invention provides a high-strength hot-dip zinced steel sheet excellent in moldability and suitability for plating which comprises a high-strength steel sheet containing, in terms of mass%, 0.05-0.25% C, 0.3-2.5% Si, 1.5-2.8% Mn, up to 0.03% P, up to 0.02% S, 0.005-0.5% Al, and up to 0.0060% N, with the remainder being iron and unavoidable impurities and, formed thereon, a zinc deposit layer containing 0.05-10 mass% Al and 0.05-3 mass% Fe, with the remainder being zinc and unavoidable impurities, characterized in that the crystal grain boundaries and crystal grains in the steel sheet which are located in a part ranging from the interface between the high-strength steel sheet and the deposit layer to a depth of 5 [mu]m have an average content of silicon-containing oxides of 0.6-10 mass% and that an Fe-Zn alloy having an average particle diameter of 0.5-3 [mu]m is present in the deposit layer.

Description

technical field [0001] The present invention relates to a high-strength hot-dip galvanized steel sheet and a high-strength alloyed hot-dip galvanized steel sheet and a manufacturing method thereof. , Corrosion resistance, can be suitable for various purposes, such as steel plates for building materials or plated steel plates for steel plates for automobiles. Background technique [0002] A hot-dip galvanized steel sheet is widely used as a coated steel sheet having good corrosion resistance. This kind of hot-dip galvanized steel sheet is usually produced by the following method, that is, after degreasing the steel sheet, preheating it with a non-oxidizing furnace, performing reduction annealing in a reduction furnace for cleaning the surface and ensuring the material, and dipping it in a hot-dip galvanized steel sheet. In the plating solution, the amount of deposition is controlled. It is characterized in that it is excellent in formability, corrosion resistance, plating a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C21D9/46C22C18/00C22C18/04C22C38/00C22C38/06C23C2/02C23C2/28
CPCC21D9/46C22C18/00C22C18/04C22C38/02C22C38/04C22C38/06C23C2/06C23C2/28B32B15/013C21D8/0263C22C38/001Y10T428/1266Y10T428/12674Y10T428/12799Y10T428/12972C23C2/261C23C2/29C23C2/024C23C2/0222
Inventor 本田和彦西山铁生末宗义广伊藤健郎田中幸基池松阳一
Owner NIPPON STEEL CORP
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