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Hot-pressed member

Active Publication Date: 2014-03-04
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent explains a method for producing a hot-pressed member that has no scales, good coating adhesion and corrosion resistance after coating, and is resistant to hydrogen entry associated with corrosion. This method is useful for making strong automobile underbody and body structural members.

Problems solved by technology

However, the hot-pressed members described in Patent Literatures 2 to 4 have the problem of hydrogen embrittlement due to the hydrogen entry into steel with corrosion in the use environment rather than the hydrogen entry into steel during heating before hot-pressing.

Method used

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Examples

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Effect test

examples

[0086]Both surfaces of a cold-rolled steel sheet having an Ac3 transformation point of 818° C., a thickness of 1.6 mm, and a composition containing, by % by mass, C: 0.23%, Si: 0.12%, Mn: 1.5%, P: 0.01%, S: 0.01%, Al: 0.03%, N: 0.005%, Cr: 0.4%, B: 0.0022%, and the balance including Fe and unavoidable impurities were electroplated in a plating bath containing 50 g / L (litter) of sodium sulfate, 100 g / L of nickel sulfate hexahydrate, and 50 g / L of zinc sulfate heptahydrate at pH2 and a temperature of 50° C. with a current density changed from 10 to 50 A / dm2 to form Zn—Ni alloy coating layers having different Ni contents and coating weights shown in Tables 1 and 2. Then, any one of a Si-containing compound, a Ti-containing compound, an Al-containing compound, and Zr-containing compound shown in Tables 1 and 2 was applied to each of the steel sheets with some exception and then dried under a condition in which the ultimate temperature was 140° C. to form any one of a Si-containing compo...

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Abstract

A hot-pressed member includes a steel sheet, a Ni-diffusion region present in a surface layer of the steel sheet, and an intermetallic compound layer and a ZnO layer which are provided in order on the Ni-diffusion region, the intermetallic compound layer corresponding to a γ phase present in a phase equilibrium diagram of a Zn—Ni alloy, wherein a spontaneous immersion potential indicated in a 0.5 M NaCl aqueous air-saturated solution at 25° C.±5° C. is −600 to −360 mV based on a standard hydrogen electrode.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the U.S. National Phase application of PCT International Application No. PCT / JP2010 / 069643, filed Oct. 28, 2010, and claims priority to Japanese Patent Application Nos. 2009-247384, filed Oct. 28, 2009, 2010-102849, filed Apr. 28, 2010 and 2010-218094, filed Sep. 29, 2010, disclosure of which are incorporated herein by reference in their entireties for all purposes.FIELD OF THE INVENTION[0002]The present invention relates to a hot-pressed member produced by pressing a heated steel sheet, and particularly to a hot-pressed member used for underbody parts and car body structures of automobiles and a method for producing the same.BACKGROUND OF THE INVENTION[0003]Many underbody parts and body structural members of automobiles have been produced by pressing steel sheets having predetermined strength. From the viewpoint of global environment conservation, weight lightening of automobile car bodies has recently been desired ea...

Claims

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Application Information

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IPC IPC(8): B32B15/04B32B15/18
Inventor NAKAMARU, HIROKINAKAJIMA, SEIJIMIYOSHI, TATSUYAMASUOKA, HIROYUKIOOTSUKA, SHINJI
Owner JFE STEEL CORP
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