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EP3561142

HOT PRESS FORMING PLATED STEEL SHEET HAVING EXCELLENT IMPACT PROPERTY, HOT PRESS MOLDING MEMBER, AND MANUFACTURING METHOD THEREOF

Filed
Dec 15, 2017
Technology
Chemistry · Surface technology, coating +1
UPC cases
1
EPO proceedings
2
Ownership history
As recorded at the EPO. Transfers made after the opposition period are recorded in national registers and may be missing here.
Abstract

[0001] One aspect of the present invention relates to a hot press forming plated steel sheet having an excellent impact property, comprising: a base steel sheet including, by wt%, 0.15-0.4% of C, 0.05-1.0% of Si, 0.6-3.0% of Mn, 0.001-0.05% of P, 0.0001-0.02% of S, 0.01-0.1% of Al, 0.001-0.02% of N, 0.001-0.01% of B, 0.01-0.5% of Cr, 0.01-0.05% of Ti, and the balance of Fe and inevitable impurities; and an Al-Si plated layer formed on the surface of the base steel sheet, wherein the thickness of a carbon depletion layer is 5 µm or less on a surface layer part of the base steel sheet. (The surface layer part means a region from the surface of the base steel sheet to a depth of 200 µm, and the carbon depletion layer means a region which is 50% or less of an average C amount (C0) of the base steel sheet.)

Litigation history
DateCaseDivisionTypeOutcomeParties
Jul 10, 2026UPC CFI 2509/2026Dusseldorf LDInfringementLockedPOSCO Co., Ltd. +3

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