Method and apparatus for producing high-strength hot-dipped galvanized steel sheet

A technology of hot dip galvanizing and manufacturing method, applied in manufacturing tools, heat treatment equipment, hot dip plating process, etc., can solve problems such as the inability to stabilize the adhesion of plating, and achieve the effect of improving workability

Active Publication Date: 2017-05-24
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the method described in Patent Document 1, good plating adhesion cannot be obtained stably.

Method used

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  • Method and apparatus for producing high-strength hot-dipped galvanized steel sheet
  • Method and apparatus for producing high-strength hot-dipped galvanized steel sheet
  • Method and apparatus for producing high-strength hot-dipped galvanized steel sheet

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Experimental program
Comparison scheme
Effect test

Embodiment

[0183] After melting the steels with the chemical compositions shown in Table 2, billets were produced by continuous casting.

[0184] [Table 2]

[0185] [Table 2]

[0186] (quality%)

[0187] steel symbol C Si mn P S Al Mo Nb Ti Cu Ni Cr B A 0.08 0.25 1.5 0.03 0.001 - 0.1 0.04 - - - 0.6 0.001 B 0.11 0.8 1.9 0.01 0.001 0.05 - - - - - - - C 0.08 1.0 3.5 0.01 0.001 - - - - 0.2 - - - D 0.12 1.4 1.9 0.01 0.001 - - - - - 0.1 - - E 0.09 1.5 2.5 0.01 0.001 - - - 0.02 - - - 0.001 F 0.06 2.1 2.8 0.01 0.001 - - - 0.02 - - - - G 0.15 0.3 4.2 0.01 0.001 - - - - - - 0.2 - H 0.10 1.2 2.7 0.01 0.001 - - - - - - - -

[0188] These slabs were heated at 1200°C, and then hot-rolled at a finish rolling temperature of 890°C so as to have a thickness of 2.6mm. The coiling temperature is coiled into a coil, and after cooling, the ...

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Abstract

Provided is a method for producing a high-strength hot-dipped galvanized steel sheet that has excellent plating adhesion, processability and appearance. A method for producing a high-strength hot-dipped galvanized steel sheet, which comprises: a hot rolling step wherein after hot rolling a slab that contains, in mass%, 0.05-0.30% of C, 0.1-2.0% of Si and 1.0-4.0% of Mn, the hot-rolled slab is wound into a coil at a specific temperature Tc and is subjected to acid pickling; a cold rolling step wherein the hot-rolled plate obtained in the hot rolling step is subjected to cold rolling; an annealing step wherein the cold-rolled sheet obtained in the cold rolling step is annealed under specific conditions; and a hot dip galvanization step wherein the annealed plate after the annealing step is subjected to hot dip galvanization in a hot dip galvanization bath that contains 0.12-0.22% by mass of Al.

Description

technical field [0001] The present invention relates to a method for manufacturing a high-strength hot-dip galvanized steel sheet that uses a high-strength steel sheet containing Si and Mn as a base material and is excellent in appearance and plating adhesion, and a manufacturing facility for carrying out the manufacturing method. Background technique [0002] In recent years, in the fields of automobiles, home appliances, building materials, etc., surface-treated steel sheets that impart rust resistance to raw steel sheets, especially hot-dip galvanized steel sheets and alloyed hot-dip galvanized steel sheets that are excellent in rust resistance, are being used. In addition, from the viewpoint of improving the fuel consumption of automobiles and improving the collision safety of automobiles, it is preferable to use high-strength steel sheets that have been strengthened and thinned as vehicle body materials. [0003] Generally, hot-dipped galvanized steel sheets use thin st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/46C22C38/00C22C38/04C23C2/02C23C2/06C23C2/28C23C2/40
CPCC23C2/02C23C2/06C23C2/28C23C2/40C22C38/04C21D9/46C21D8/0226C21D8/0236C21D8/0273C21D8/0278C22C38/002C22C38/02C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18C22C38/32C22C38/38C23C2/0222C23C2/024C23C2/0224C23C2/0038C21D8/0247C23C2/022C23C2/29C22C38/00C23F17/00
Inventor 牧水洋一铃木善继高桥秀行武田玄太郎藤田耕一郎
Owner JFE STEEL CORP
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