High-strength steel sheet plated with zinc by hot dipping with excellent formability and process for producing the same

A technology of hot-dip galvanized steel sheet and manufacturing method, which is applied in the direction of manufacturing tools, hot-dip galvanizing technology, chemical instruments and methods, etc., can solve the problems of increased manufacturing cost and constraints, and achieve the effect of excellent formability

Inactive Publication Date: 2008-04-23
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When designing such a process, as mentioned above, there is a problem that it is restricted by the production line, resulting in an increase in manufacturing cost.

Method used

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  • High-strength steel sheet plated with zinc by hot dipping with excellent formability and process for producing the same
  • High-strength steel sheet plated with zinc by hot dipping with excellent formability and process for producing the same
  • High-strength steel sheet plated with zinc by hot dipping with excellent formability and process for producing the same

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Embodiment

[0096] The following describes the embodiments of the present invention in more detail, but the present invention is not limited to the following embodiments, and additional changes are allowed without changing the gist of the present invention.

[0097] The steel of the chemical composition shown in Table 1 was smelted to obtain a cast piece, which was hot pressed, pickled, and cold rolled to form a 1.2 mm thick cold rolled steel sheet. Then, after heat treatment under the conditions shown in Tables 2 and 3, the weight per unit area was 50 / 50g / m using a galvanizing bath at 463°C. 2 The alloying treatment is performed to make the Fe% of the plating layer 9% by mass. The obtained steel sheet was subjected to temper rolling at 0.3%. In addition, the N content of the steel material is 0.0020-0.0060 mass%.

[0098] Observe 10 views of the structure of the cross section (plane parallel to the rolling direction) of the steel sheet with a scanning electron microscope (SEM) at 2000 times,...

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Abstract

A high-strength steel sheet plated with zinc by hot dipping which has excellent processability. It can be produced using a production line which includes zinc plating by hot dipping and in which a sufficient austempering time after annealing is not secured, without necessitating a special structural control as a pretreatment. The high-strength steel sheet plated with zinc by hot dipping contains 0.05-0.3 mass% carbon, up to 1.4 mass% (including 0 mass%) silicon, 0.08-3 mass% manganese, 0.003-0.1 mass% phosphorus, up to 0.07 mass% sulfur, 0.1-2.5 mass% aluminum, 0.1-0.5 mass% chromium, and up to 0.007 mass% nitrogen, provided that silicon + aluminum = 0.5 mass%, with the remainder consisting of iron and unavoidable impurities. The steel sheet has a volume content of residual austenite of 3% or higher, and residual austenite grains have an average aspect ratio of 2.5 or lower.

Description

Technical field [0001] The present invention relates to a high-strength hot-dip galvanized steel sheet with excellent formability used in industrial fields such as automobiles and electrical appliances, and a method for manufacturing the same. Background technique [0002] In recent years, starting from the understanding of global environmental protection, the increase in fuel consumption of automobiles has become an important issue. For this reason, extensive development activities have been carried out to reduce the weight of the vehicle body by increasing the strength of the vehicle body material to achieve thinning. However, generally, the increase in strength of the steel sheet leads to a decrease in formability. Therefore, it is desired to develop materials that have both high strength and high workability. [0003] As a material that meets this requirement, TRIP steel that utilizes the transformation-induced plasticity of retained austenite has attracted attention. In the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46
CPCC22C38/38C22C38/02C22C38/06C22C38/04C23C2/28C22C38/002C23C2/02C21D9/46B32B15/013C21D2211/001C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/40C23C2/024C23C2/0224C21D8/0273C23C2/06C23F17/00
Inventor 松田广志中垣内达也二冢贵之高木周作长泷康伸
Owner JFE STEEL CORP
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