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Alloyed hot-dip galvanized steel sheet and manufacturing method therefor

A hot-dip galvanized steel sheet, hot-dip galvanized technology, applied in the direction of hot-dip galvanizing process, chemical instruments and methods, coating of superimposed layers, etc., can solve the problems that the r value cannot be improved, and achieve excellent deep drawing properties , Excellent formability, high formability effect

Active Publication Date: 2012-07-11
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to increase the strength of the steel plate, it is effective to increase the amount of C added, but the high-strength steel plate with C added cannot improve the r value as the mild steel plate mentioned above

Method used

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  • Alloyed hot-dip galvanized steel sheet and manufacturing method therefor
  • Alloyed hot-dip galvanized steel sheet and manufacturing method therefor
  • Alloyed hot-dip galvanized steel sheet and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] Heating the slab with the composition of Table 1 (very low carbon steel) to 1150°C, hot-rolling at a finish rolling temperature of 910-930°C, making a 4mm hot-rolled steel strip, and coiling it at 680-720°C around the hot rolled steel strip. After pickling, the hot-rolled steel strip was subjected to cold rolling to produce a 0.8 mm cold-rolled steel strip. Furthermore, the cold-rolled steel strip is annealed, plated, and alloyed using continuous hot-dip galvanizing equipment with an in-line annealing method to manufacture alloyed hot-dip galvanized steel sheets. During plating, the annealing atmosphere was set at 5 vol% hydrogen+95 vol% nitrogen mixed gas, the annealing temperature was set at 800-840° C., and the annealing time was set at 90 seconds. As the molten zinc bath, use a coating bath with an effective Al concentration in the bath (Al concentration that can be used as metal) of 0.105%, and use an air brush (gas wiper) to adjust the reference amount of zinc to...

Embodiment 2

[0171] The slab having the composition marked C in Table 1 is heated to 1150°C, hot-rolled at a finish rolling temperature of 910-930°C to produce a 4mm hot-rolled steel strip, and the hot-rolled steel strip is coiled at 680-720°C. Rolled steel strip. After pickling, the hot-rolled steel strip was subjected to cold rolling to produce a 0.8 mm cold-rolled steel strip. Furthermore, the cold-rolled steel strip is annealed, plated, and alloyed using continuous hot-dip galvanizing equipment with an in-line annealing method to manufacture alloyed hot-dip galvanized steel sheets. During plating, the annealing atmosphere was set at 5 vol% hydrogen+95 vol% nitrogen mixed gas, the annealing temperature was set at 800-840° C., and the annealing time was set at 90 seconds. As a molten zinc bath, use a coating bath with an effective Al concentration in the bath of 0.105%, and use an air brush to adjust the reference amount of zinc to 50g / m 2 . For alloying heating, alloying is performed...

Embodiment 3

[0185] A slab having a composition marked D in Table 1 is heated to 1150°C, hot-rolled at a finish rolling temperature of 910-930°C, and a 4mm hot-rolled steel strip is produced, and the hot-rolled steel strip is coiled at 680-720°C. Rolled steel strip. After pickling, the hot-rolled steel strip was subjected to cold rolling to produce a 0.8 mm cold-rolled steel strip. Furthermore, the cold-rolled steel strip is annealed, plated, and alloyed using continuous hot-dip galvanizing equipment with an in-line annealing method to manufacture alloyed hot-dip galvanized steel sheets. During plating, the annealing atmosphere was set at 5 vol% hydrogen+95 vol% nitrogen mixed gas, the annealing temperature was set at 800-840° C., and the annealing time was set at 90 seconds. As a molten zinc bath, use a coating bath with an effective Al concentration in the bath of 0.105%, and use an air brush to adjust the reference amount of zinc to 50g / m 2 . For alloying heating, alloying is perform...

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Abstract

Disclosed is an alloyed hot-dip galvanized steel sheet provided with: a steel sheet; an alloyed hot-dip galvanization layer that is formed on at least one surface of the steel sheet and contains between 0.05% and 0.5% aluminum and between 6% and 12% iron, by mass, with the remainder comprising zinc and unavoidable impurities; and a magnesium / zinc / phosphorus complex oxide layer that is formed on the surface of the alloyed hot-dip galvanization layer and contains between 0.1 mg / m2 and 100 mg / m2 magnesium, between 1 mg / m2 and 100 mg / m2 phosphorus, and zinc. The ratio between the amount of phosphorus and the amount of magnesium in the complex oxide layer is between 0.3 and 50. At the interface between the alloyed hot-dip galvanization layer and the complex oxide layer (5), the alloyed hot-dip galvanization layer has a flat region having an area ratio between 10% and 70% and a roughened-surface region that is closer to the steel sheet than the flat region is. The magnesium / zinc / phosphorus complex oxide layer contains an amorphous compound.

Description

technical field [0001] The present invention relates to an alloyed hot-dip galvanized steel sheet with excellent formability and a manufacturing method thereof. In particular, it relates to a galvannealed steel sheet particularly excellent in deep drawability and a method for producing the same. [0002] this application claims priority based on Japanese Patent Application No. 2009-245871 for which it applied to Japan on October 26, 2009, and uses the content here. Background technique [0003] Alloyed hot-dip galvanized steel sheets are often used in home appliances and building materials, including automobiles, due to their excellent properties such as coating adhesion, post-painting corrosion resistance, and weldability. The alloyed hot-dip galvanized steel sheet is produced by heating and maintaining the steel sheet at a temperature above the melting point of zinc immediately after hot-dip galvanizing on the surface of the steel sheet. In this way, when the hot-dip gal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C22C18/00C22C38/00C22C38/14C23C2/28C23C2/40C23C22/07C23C22/08C23C28/00
CPCC22C38/14C23C28/345C23C2/28C23C2/06C23C2/40C22C38/04C22C38/06C23C28/321C22C38/02B32B15/013C22C18/00C22C38/001C23C22/182C23C2/261
Inventor 本田和彦铃木规之池松阳一
Owner NIPPON STEEL CORP
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