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Hot-dip galvanized steel sheet

A technology of hot-dip galvanized steel sheet and hot-dip galvanized steel, applied in the field of hot-dip galvanized steel sheet and high-strength hot-dip galvanized steel sheet, can solve the bad influence of Si-Mn oxide coating adhesion, Si-Mn oxide coating There are no problems such as disclosure of oxides, and the effects of excellent plating adhesion and corrosion resistance are achieved.

Active Publication Date: 2017-08-29
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In the steel sheet described in Patent Document 12, it is described that Si-Mn oxides adversely affect plating adhesion
However, the technique of reducing the Si-Mn oxide before the start of plating is not disclosed in Patent Document 12
In addition, in Patent Document 12, since the temperature of the immersion material is higher than the bath temperature (although it also depends on the Al of the plating bath, the lowest is bath temperature + 4°C, and the highest is as high as bath temperature + 28°C), so the The temperature stability and the uniformity of product characteristics remain issues

Method used

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Examples

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Embodiment

[0262] Hereinafter, examples of the present invention will be described. In addition, the conditions in this example are an example of conditions adopted in order to confirm the practicability and effects of the present invention. The present invention is not limited to this conditional example. In the present invention, various conditions can be adopted as long as the object of the present invention is achieved without departing from the gist of the present invention.

[0263] Slabs having chemical components (compositions) of A to BY shown in Tables 1 to 6 were cast, and hot rolled under the conditions (slab heating temperature, rolling completion temperature) shown in Tables 7 to 10. Next, cooling was performed under the conditions shown in Tables 7 to 10 (average cooling rate from completion of hot rolling to coiling, coiling temperature, formula (1)) to obtain hot-rolled steel sheets.

[0264] Thereafter, the hot-rolled steel sheets were pickled, and cold-rolled under t...

experiment example 190

[0352] Experimental Example 190 is an example in which the content of C was small, the volume fraction of the hard phase was small, and sufficient strength, ductility, and hole expandability were not obtained.

experiment example 191

[0353] Experimental example 191 is an example in which the content of C is large and the spot weldability deteriorates. In addition, the fraction of martensite increases, and fatigue resistance, ductility, hole expandability, and bendability are inferior.

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Abstract

A hot-dip galvanized steel sheet comprising a base steel sheet and a hot-dip galvanizing layer, the hot-dip galvanized steel sheet having a hot-dip galvanizing layer in which columnar crystals comprising 5% or less of Fe, 1.0% or less of Al, and a Zeta phase are interposed in 20% or more of the entire interface of the plating layer and the steel sheet on the surface of a base steel sheet in which a ferrite phase constitutes 40%-97% and a hard structure constitutes a total of 3% or more in terms of volume ratio in a range of 1 / 8 thickness to 3 / 8 thickness from the surface of the base steel sheet, and the volume ratio of the hard structure in a surface layer range to a depth of 20 mum in the base steel sheet from the interface of the plating layer and the base steel sheet is 0.10-0.90 times the volume ratio of the hard structure in the range of 1 / 8 thickness to 3 / 8 thickness, the hot-dip galvanized steel sheet having a refined layer on the interface side of the base steel sheet, and the average thickness of the refined layer, the average grain size of a ferrite phase in the refined layer, and the maximum diameter of oxides included in the refined layer each being prescribed.

Description

technical field [0001] The present invention relates to hot-dip galvanized steel sheets. The present invention relates to a high-strength hot-dip galvanized steel sheet that is particularly excellent in ductility, bendability, hole expandability, and coating adhesion during bending deformation, and is excellent in continuous bending fatigue resistance. [0002] this application claims priority based on Japanese Patent Application No. 2014-225612 for which it applied to Japan on November 5, 2014, The content is used here. Background technique [0003] In recent years, there has been an increasing demand for higher strength of steel sheets mainly used in frame parts of automobiles. In these high-strength steel sheets, formability such as ductility, bendability, and stretch-flange formability are required in order to obtain complex part shapes. In addition, since they are often exposed to vibrations when used as automotive parts, high fatigue resistance is also required. Fur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C18/00C22C38/06C22C38/58C23C2/06C23C2/28C23C2/40
CPCC23C2/06C23C2/28C23C2/40C21D9/46C22C18/00C22C38/00C22C38/06C22C38/58C21D8/0205C21D8/0257C21D8/0273C21D2211/001C21D2211/002C21D2211/008C21D2211/009Y10T428/12799B32B15/013C21D2211/005C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18C23C2/29C23C2/261B32B2255/06B32B2255/205
Inventor 川田裕之安井健志植田浩平丸山直纪山口裕司内田智史驹见亮介荒井隼人中岛康宏中村登代充
Owner NIPPON STEEL CORP
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