Hot-dip galvanized thin steel sheet, thin steel sheet processed by hot-dip galvanized layer, and a method of producing the same

A technology of hot-dip galvanizing and thin steel plate, applied in the direction of hot-dip galvanizing process, chemical instruments and methods, solid-state diffusion coating, etc., which can solve the problems of not providing corrosion resistance and not considering the wettability of coatings, etc.

Inactive Publication Date: 2008-02-20
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this invention does not take into account the wettability of the coating, nor does it prov

Method used

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Effect test

Example

[0397] Practical example 1 of implementation 2

[0398] Hereinafter, the present invention will be explained in detail based on Example 1 of Embodiment 2.

[0399] Heat the thin steel sheet with the chemical composition shown in Table 6 to a temperature of 1200℃; 3 The hot rolling of the steel is completed at the temperature of the transformation temperature; the hot-rolled steel sheet is cooled, and then the steel sheet is coiled at a temperature not lower than the bainite transformation point, the temperature is determined by the chemical composition of each steel; then the acid After washing, the steel sheet was cold-rolled into a cold-rolled steel sheet having a thickness of 1.0 mm.

[0400] Thereafter, Ac 1 Transition temperature and Ac 3 The transformation temperature of each steel composition (in mass%) is calculated according to the following formula:

[0401] Ac 1 =723-10.7×Mn%-16.9×Ni%+29.1×Si%+16.9×Cr%,

[0402] Ac 3 =910-203×(C%) 1 / 2 +15.2×Ni%+44.7×Si%+104×V%+31.5×Mo%-...

Example

[0439] Example 1 of Embodiment 3

[0440] Hereinafter, the present invention will be explained in detail based on Example 1 of Embodiment 3.

[0441] Heat the steel sheet with the chemical composition shown in Table 9 to a temperature of 1200℃; 3 The hot rolling of steel is completed at the temperature of the transformation point; the hot-rolled steel sheet is cooled, and then the steel sheet is coiled at a temperature not lower than the bainite transformation point, the temperature is determined by the chemical composition of each steel; then pickling , The thin steel sheet is cold rolled into a cold rolled thin steel sheet with a thickness of 1.0 mm.

[0442] Thereafter, Ac 1 Transition temperature and Ac 3 The transformation temperature is calculated according to the composition of each steel (in mass%) according to the following formula:

[0443] Ac 1 =723-10.7×Mn%+29.1×Si%,

[0444] Ac 3 =910-203×(C%) 1 / 2 +44.7×Si%+31.5×Mo%-30×Mn%-11×Cr%+400×Al%.

[0445] The thin steel sheet...

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Abstract

The present invention provides: a high-strength high-ductility hot-dip galvanized steel sheet and hot-dip galvannealed steel sheet having high fatigue resistance and corrosion resistance; a high-strength hot-dip galvanized steel sheet excellent in ductility, which improves non-plating defects and plating adhesion after severe deformation, and a method of producing the same; a high-strength and high-ductility hot-dip galvanized steel sheet having high fatigue resistance and corrosion resistance; a high-strength hot-dip galvanized steel sheet and hot-dip galvannealed steel sheet having superiorappearance and workability, which suppresses the generation of non-plating defects, and a method of producing the same; and a high-strength hot-dip galvannealed steel sheet and a high-strength hot-dip galvanized steel sheet, which suppress non-plating defects and surface defects and have both corrosion resistance, in particular corrosion resistance in an environment containing chlorine ion, and high ductility, and a method of producing the same.

Description

[0001] This application was submitted on June 6, 2002, and the title of the invention is "High-strength hot-dip galvanized steel sheet with fatigue resistance, corrosion resistance, ductility and high coating adhesion after strong deformation and hot-dip galvanized layer diffusion A divisional application of Chinese Patent Application No.02811523.6 (International Application No. PCT / JP02 / 05627) of “Thin Steel Plates Treated and Manufacturing Methods Thereof”. technical field [0002] The invention relates to a high-strength, high-ductility hot-dip galvanized thin steel sheet and a thin steel sheet with a hot-dip galvanized layer treated by diffusion. The steel sheet has excellent fatigue resistance and corrosion resistance, and is suitable for building materials, household Electrical appliances and automobiles, and the steel sheet has excellent corrosion resistance and workability in an environment containing chloride ions and relates to a manufacturing method of the steel shee...

Claims

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Application Information

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IPC IPC(8): B32B15/01C23C2/02C23C2/28C23C2/40C23C8/14C21D6/00C21D8/02C21D8/04C22C38/18C22C38/12
Inventor 藤田展弘东昌史高桥学森本康秀黑崎将夫宫坂明博
Owner NIPPON STEEL CORP
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