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Method for producing high strength hot-dip galvanized steel sheet

A technology of hot-dip galvanized steel sheet and manufacturing method, which is applied to manufacturing tools, hot-dip plating process, heat treatment furnace, etc., can solve the problem of lack of stable coating adhesion, etc., and achieve the effect of excellent workability and fatigue resistance.

Active Publication Date: 2019-06-18
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in Patent Document 1, good coating adhesion was not stably obtained.

Method used

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  • Method for producing high strength hot-dip galvanized steel sheet
  • Method for producing high strength hot-dip galvanized steel sheet
  • Method for producing high strength hot-dip galvanized steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] A cold-rolled steel sheet having a thickness of 1.2 mm was produced by hot-rolling, pickling, and cold-rolling cast slabs obtained by melting steels having chemical compositions shown in Table 1.

[0123]

[0124] Next, after performing front-stage and post-stage oxidation treatments under the oxidation conditions shown in Table 2 by CGL having a DFF type oxidation furnace or NOF type oxidation furnace, reduction annealing was performed under the conditions shown in Table 2. Next, hot-dip galvanizing was performed using a bath at 460°C containing the effective Al concentration in the bath shown in Table 2, and then the weight per unit area was adjusted to about 50 g / m by gas wiping. 2 , Next, alloying treatment is carried out in the range of temperature and time shown in Table 2.

[0125] Appearance and plating adhesion were evaluated for the galvanized steel sheets (including galvannealed steel sheets) obtained as described above. In addition, tensile properties an...

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Abstract

Provided is a method for producing a high strength hot-dip galvanized steel sheet with excellent plating adhesion, workability and fatigue resistance. Oxidation is performed in which, in an early stage, a steel sheet is heated at 400-750 DEG C in an atmosphere of at least 1000 ppm by volume O2 concentration and at least 1000 ppm by volume H2O concentration and heated, in a latter stage, at 600-850DEG C in an atmosphere of less than 1000 ppm by volume O2 concentration and at least 1000 ppm by volume H2O concentration. Then, after heating the steel sheet in a heating zone to 650-900 DEG C witha temperature increase rate of at least 0.1 DEG C / sec in an atmosphere with an H2 concentration of 5 volume% to 30 volume%, H2O concentration of 500 ppm by volume to 5000 ppm by volume, the balance being made of N2 and unavoidable impurities, reduction annealing is performed in a soaking zone wherein the steel sheet is maintained at a uniform heat with a temperature variation in the soaking zone within (+ / -) 20 DEG C for 10-300 seconds in an atmosphere with an H2 concentration of 5 volume% to 30 volume%, H2O concentration of 10 ppm by volume to 1000 ppm by volume, the balance being made of N2and unavoidable impurities.

Description

technical field [0001] The present invention relates to a method for producing a high-strength hot-dip galvanized steel sheet using a Si-containing high-strength steel sheet as a base material. 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, have been used. In addition, from the perspective of improving the fuel efficiency of automobiles and improving the collision safety of automobiles, the thickness of the body material can be reduced by increasing the strength of the body material, and the weight of the body itself can be reduced and the strength increased. Therefore, high-strength steel sheets are used in automobiles. application is promoted. [0003] Generally, a hot-dip galvanized steel sheet is p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C21D9/46C21D9/56C22C38/00C22C38/04C23C2/28C23C2/40
CPCC21D1/76C23C2/06C23C2/28C23C2/40C21D9/561C22C38/00C22C38/04C21D9/46C22C38/008C22C38/02C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/22C22C38/26C22C38/28C22C38/32C22C38/38C22C38/60C23C2/0222C23C2/0224C21D8/0247
Inventor 牧水洋一武田玄太郎长谷川宽姬井善正铃木克一
Owner JFE STEEL CORP
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