High-strength hot-dip galvanized steel sheet and process for manufacturing same

A technology of hot dip galvanizing and manufacturing method, applied in manufacturing tools, chemical instruments and methods, hot dip plating process, etc., can solve problems such as inability to obtain effects stably, and achieve excellent fatigue resistance characteristics and excellent coating adhesion Effect

Active Publication Date: 2015-11-04
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, the effect cannot be obtained stably

Method used

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  • High-strength hot-dip galvanized steel sheet and process for manufacturing same
  • High-strength hot-dip galvanized steel sheet and process for manufacturing same
  • High-strength hot-dip galvanized steel sheet and process for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] The cast slabs obtained by melting the steels having the chemical components shown in Table 2 were hot-rolled, pickled, and then cold-rolled to produce cold-rolled steel sheets with a thickness of 1.2 mm.

[0087] [Table 2]

[0088]

[0089] Thereafter, the cold-rolled steel sheet was heated and oxidized by appropriately changing the outlet temperature of the oxidation furnace in a CGL having a DFF type oxidation furnace. The direct fire burner uses COG in the fuel and adjusts the air ratio to adjust the oxygen concentration of the atmosphere. The temperature of the steel plate on the exit side of the oxidation furnace was measured with a radiation thermometer. Next, reduction annealing was performed at 850°C for 20s in the reduction zone, hot-coating was performed in a galvanizing bath at 460°C with the Al addition adjusted to 0.19%, and the mass per unit area was adjusted to about 50g by gas scraping. / m 2 .

[0090] The thus obtained hot-dip galvanized steel s...

Embodiment 2

[0109] The cast slabs obtained by melting the steels having the chemical components shown in Table 2 were hot-rolled, pickled, and then cold-rolled to produce cold-rolled steel sheets with a thickness of 1.2 mm.

[0110] Thereafter, oxidation treatment and reduction annealing were performed in the same manner as in Example 1. Furthermore, hot-dip coating was performed in a 460°C galvanizing bath with an Al addition adjusted to 0.13%, and the mass per unit area was adjusted to about 50 g / m by gas scraping. 2 , alloying treatment was carried out at the specified temperature shown in Table 4 for 20 to 30 seconds.

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Abstract

A high-strength galvanized steel sheet whose base steel is a high-strength steel sheet containing Si, Mn, and B and which has good coating adhesiveness and a production method therefor are provided. A base steel sheet containing Si, Mn, and B is oxidized at a heating temperature of steel sheet T that satisfies formula below, and then subjected to reduction-annealing and galvanizing. T ‰¥ 58.65 × Si + 294400 × B - 13.59 × O 2 + 548.1 [Si]: amount of Si in the steel on a mass percent basis [B]: amount of B in the steel on a mass percent basis [O 2 ]: O 2 concentration on a volume percent basis in an atmosphere at oxidizing treatment

Description

technical field [0001] The invention relates to a high-strength hot-dip galvanized steel sheet using a high-strength steel sheet containing Si, Mn and B as a base material and a manufacturing method thereof. Background technique [0002] In recent years, surface-treated steel sheets that impart rust resistance to raw steel sheets have been used in the fields of automobiles, home appliances, and building materials. Among them, 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 viewpoint of improving the fuel consumption of automobiles and improving the safety of collisions of automobiles, high-strength high-strength is being promoted in order to reduce the weight and increase the strength of the vehicle body itself by making use of high-strength body materials to achieve thinning. Application of steel plates in automobiles. [0003] Generally speaking, the hot-dip galvanized ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/02C21D1/76C21D9/46C22C38/00C22C38/04C23C2/06C23C2/28C22C18/04C22C38/58
CPCC21D1/76B32B15/013C21D9/46C22C18/04C22C38/00C22C38/002C22C38/02C22C38/04C22C38/58C23C2/02C23C2/06C23C2/28C21D8/0478C21D9/561C23C2/0222C23C2/0038C23C2/024C23C2/0224C23C2/34C23C8/14
Inventor 牧水洋一铃木善继长泷康伸
Owner JFE STEEL CORP
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