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High-strength hot-dip zinc plated steel sheet excellent in workability and process for manufacturing the same

A hot-dip galvanized steel sheet with excellent workability. It is used in manufacturing tools, chemical instruments and methods, heat treatment furnaces, etc. It can solve problems such as poor workability and poor impact resistance, and achieve lightweight, improved corrosion resistance, and safety. Improved performance and excellent workability

Active Publication Date: 2010-09-01
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ratio of the yield strength YS to TS, that is, the yield ratio YR (=YS / TS) is high and the processability is poor.
In addition, there is a problem that the impact resistance required for safety in the event of a car collision is poor.

Method used

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  • High-strength hot-dip zinc plated steel sheet excellent in workability and process for manufacturing the same
  • High-strength hot-dip zinc plated steel sheet excellent in workability and process for manufacturing the same
  • High-strength hot-dip zinc plated steel sheet excellent in workability and process for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Use a converter to smelt the steels A to S with the composition shown in Table 1, and make billets by continuous casting, then hot-roll them at a final rolling temperature of 900°C to a plate thickness of 3.0mm, and cool them at a cooling rate of 10°C / s after rolling. Cool and coil at a coiling temperature of 600°C. Next, after pickling, cold rolling to a plate thickness of 1.2 mm, passing through a continuous hot-dip galvanizing production line, annealing under the annealing conditions shown in Tables 2 and 3, and then immersing in a plating bath at 460°C to form a plate with an adhesion of 35~ 45g / m 2 The coated layer was alloyed at 520°C and cooled at a cooling rate of 10°C / sec to manufacture coated steel sheets 1-44. In addition, as shown in Tables 2 and 3, the alloying treatment was performed on the partially plated steel sheet. Then, with respect to the obtained plated steel sheet, the area ratios of ferrite, martensite, retained austenite, and tempered martensi...

Embodiment 2

[0111] The steels AA~AL with the composition shown in Table 6 were smelted in a converter, made into slabs by continuous casting, hot rolled at a final rolling temperature of 900°C to a plate thickness of 3.0mm, and cooled at a cooling rate of 10°C / s after rolling Cool and coil at a coiling temperature of 600°C. Next, after pickling, cold rolling to a plate thickness of 1.2 mm, passing through a continuous hot-dip galvanizing production line, annealing under the annealing conditions shown in Table 7, and then immersing in a plating bath at 460°C to form a plate with an adhesion weight of 35-45g / m 2 The coated layer was alloyed at 520°C and cooled at a cooling rate of 10°C / sec to manufacture coated steel sheets 101-130. In addition, as shown in Table 7, the alloying treatment was performed on the partially plated steel sheet. Then, for the obtained coated steel sheet, the area ratio of ferrite, martensite, retained austenite and tempered martensite and the area ratio of mart...

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Abstract

The invention provides a high-strength hot-dip zinc plated steel sheet which exhibits high TS-El balance, excellent stretch frangeability, excellent workability due to low YR, and excellent impact characteristics, and a process for manufacturing the same. A high-strength hot-dip zinc plated steel sheet excellent in workability and impact characteristics, having a composition which contains by mass C: 0.05 to 0.3%, Si: 0.01 to 2.5%, Mn: 0.5 to 3.5%, P: 0.003 to 0.100%, S: 0.02% or below, Al: 0.010 to 1.5%, and N: 0.007% or below and further contains at least one element selected from among Ti, Nb and V in a total amount of 0.01 to 0.2% with the balance being Fe and unavoidable impurities and a microstructure which comprises, in terms of area fraction, 20 to 87% of ferrite, 3 to 10% (in total) of martensite and retained austenite, and 10 to 60% of tempered martensite and in which the average grain diameter of the second phase consisting of the martensite, retained austenite, and tempered martensite is 3[mu]m or below.

Description

technical field [0001] The present invention relates to a high-strength hot-dip galvanized steel sheet excellent in workability and impact resistance used in the industrial fields of automobiles and electric appliances, and a method for producing the same. Background technique [0002] In recent years, improving the fuel efficiency of automobiles has become an important issue from the standpoint of protecting the global environment. Therefore, studies are being made to increase the strength and thickness of a steel plate as a vehicle body material, and to reduce the weight of the vehicle body itself. The use of high-strength steel sheets for vehicle body materials is being actively promoted because the increase in the strength of vehicle body materials is closely related to improving the safety of automobiles during collisions. However, generally, the ductility of the steel sheet is lowered due to the increase in strength of the steel sheet, that is, the workability is lowe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/58C21D9/46C23C2/06
CPCC21D8/0426C21D9/46C21D2211/009C21D9/48C22C38/04C21D2211/005C23C2/06C21D2211/001C21D8/0436C21D2211/002C21D8/0405C21D2211/008C22C38/06C21D8/04C22C38/02Y10T428/12799B32B15/013C21D1/26C21D8/0263C22C38/001C22C38/002C22C38/005C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18C22C38/24C22C38/26C22C38/28C22C38/32C22C38/38C21D8/02C23C30/00
Inventor 中垣内达也高木周作松冈才二金子真次郎
Owner JFE STEEL CORP
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