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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 sheet, applied in hot-dip galvanizing process, chemical instruments and methods, solid-state diffusion coating, etc., can solve the problems of not providing corrosion resistance, not considering the wettability of the coating

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

AI Technical Summary

Problems solved by technology

However, this invention does not take into account the wettability of the coating, nor does it provide corrosion resistance while allowing thickness reductions with concomitant increases in strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 2 example 1

[0398] The present invention will be explained in detail below based on Example 1 of Embodiment 2.

[0399] A thin steel plate having the chemical composition shown in Table 6 is heated to a temperature of 1200°C; at a temperature not lower than Ar 3 The hot rolling of the steel is completed at the temperature of the transformation temperature; the hot-rolled sheet is cooled and then coiled at a temperature not lower than the bainite transformation point, which is determined by the chemical composition of each steel; then acid Washing, and cold-rolling the thin steel sheet into a cold-rolled thin steel sheet with a thickness of 1.0 mm.

[0400] Thereafter, Ac 1 transition temperature and Ac 3 The transformation temperature is calculated by the composition of each steel (in mass%) 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%-30×Mn%-11×Cr%-20×Cu%+700×P%+400×Al...

Embodiment approach 3 Embodiment 1

[0440] The present invention will be explained in detail below based on Example 1 of Embodiment 3.

[0441] A thin steel plate having the chemical composition shown in Table 9 is heated to a temperature of 1200°C; at a temperature not lower than Ar 3 The hot rolling of the steel is completed at the temperature of the transformation point; the hot-rolled sheet is cooled and then coiled at a temperature not lower than the bainite transformation point, which is determined by the chemical composition of each steel; followed by 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 following formula according to the composition of each steel (in mass%):

[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 plate is coate...

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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 superior appearance 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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Patent Type & Authority Applications(China)
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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