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High-strength hot-dip galvanized steel sheet having excellent uniform elongation and plating properties, and method for manufacturing same

A hot-dip galvanized steel sheet, uniform elongation technology, applied in the direction of chemical instruments and methods, manufacturing tools, heat treatment furnaces, etc., can solve the problems of property deterioration, etc., to achieve excellent coating performance, suppress yield elongation, and excellent processing The effect of sex and surface quality

Active Publication Date: 2013-07-17
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the inventors of the present invention conducted research in the low cooling rate range, and as a result, it was found that the second phase of some of the steel sheets described in the examples decomposed into pearlite, and the properties were greatly deteriorated.

Method used

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  • High-strength hot-dip galvanized steel sheet having excellent uniform elongation and plating properties, and method for manufacturing same
  • High-strength hot-dip galvanized steel sheet having excellent uniform elongation and plating properties, and method for manufacturing same
  • High-strength hot-dip galvanized steel sheet having excellent uniform elongation and plating properties, and method for manufacturing same

Examples

Experimental program
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Embodiment

[0152] Hereinafter, examples of the present invention will be described.

[0153] Table 1 shows the chemical composition of the sample steel, and Table 2 shows the manufacturing conditions. Steel having the chemical composition shown in Table 1 was melted in a vacuum melting furnace and cast to form a slab. After reheating this to a temperature range of 1150 to 1290° C., rough rolling is performed to form a rough slab with a thickness of about 27 mm. Next, it is hot-finish-rolled to a thickness of 4mm in the temperature range of 870-980°C, and then immediately cooled to a temperature range of 450-650°C by spraying water, and kept in a heating furnace at this temperature for 1 hour to carry out equivalent The coiling process forms hot-rolled sheets. After the scale of the hot-rolled sheet was removed by pickling, it was cold-rolled at a rolling reduction of 80% to form a cold-rolled sheet with a thickness of 0.8 mm. According to the temperature conditions shown in Table 2, t...

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Abstract

This invention provides a high-strength hot-dip galvanized steel sheet having a tensile strength of from 440 MPa to less than 590 MPa, excellent uniform elongation as a formability characteristic, reduced yield elongation as a quality characteristic of an outer panel, and good plating properties. This invention also provides a method for manufacturing the steel sheet. This steel sheet contains 0.06-0.20% C, less than 0.50% Si, from 0.5% to less than 2.0% Mn, no more than 0.05% P, no more than 0.02% S, 0.60-2.00% Al, less than 0.004% N, 0.10-0.40% Cr, and no more than 0.003% (including 0%) B. The expressions 0.8 =< Mneq <= 2.0 and Mneq + 1.3 [%Al] >= 2.8 are satisfied. Ferrite is the matrix, and the second phase has a volume fraction of 15% or less. The second phase has martensite at a volume fraction of 3% or more and residual austenite at a volume fraction of 3% or more. The total volume fraction of pearlite and bainite is equal to or less than the volume fraction of martensite and residual austenite.

Description

technical field [0001] The present invention relates to a stamped part that can be applied to automobile bodies and home appliances requiring high formability and plating properties, has a tensile strength of 440 MPa or more and less than 590 MPa, and is excellent in uniform elongation and plating properties. Strength hot-dip galvanized steel sheet and its manufacturing method. Background technique [0002] In recent years, from the viewpoint of improving the fuel efficiency of automobiles, weight reduction of vehicle bodies has been strongly demanded. In addition, from the viewpoint of protecting occupants during a vehicle collision, it is also required to improve the collision safety of the vehicle. In order to achieve both weight reduction and crash safety of the car body, high-strength and thin-walled parts are being promoted by using high-strength steel sheets for body parts. [0003] However, since press formability such as ductility and deep drawability decreases as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/38C22C38/60C23C2/06
CPCC21D8/0236C23C2/02C23C2/28C23C2/06C21D2211/005C22C38/04C21D2211/001C21D2211/008C21D9/46C22C38/06C21D8/0226C22C38/02C22C38/001C22C38/18Y10T428/12799Y10T428/12972C23C2/024C23C2/0224C22C38/00B32B15/013B32B15/18C23C30/005
Inventor 高桥健二奥田金晴小野义彦
Owner JFE STEEL CORP
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