HIGH-STRENGTH HOT DIP GALVANIZED STEEL PLATE HAVING EXCELLENT MOLDABILITY, WEAK MATERIAL ANISOTROPY AND ULTIMATE TENSILE STRENGTH OF 980 MPA OR MORE, HIGH-STRENGTH ALLOYED HOT DIP GALVANIZED STEEL PLATE AND MANUFACTURING METHOD THEREFOR

WIPO Patent Application WO/2013/047819

A1

Provided is a hot dip galvanized steel plate having a hot dip galvanized layer on the surface of a base material steel plate. The base material steel plate contains 0.1 to less than 0.40% C, 0.5 to 3.0% Si, 1.5 to 3.0% Mn by mass, the quantity of O is limited to 0.006% or less, quantity of P to 0.04% or less, quantity of S to 0.01% or less, quantity of Al to 2.0% or less and quantity of N to 0.01% or less by mass, with the remainder consisting of iron and unavoidable impurities. The microstructure of the base material steel plate contains 40% or more ferrite, 8 to less than 60% residual austenite, in volume fraction, with the remainder consisting of bainite or martensite. In a plate thickness range of 5/8 to 3/8 from the surface of the base material steel plate, the polar density of specific crystal orientation is within a predetermined range. The hot dip galvanized layer contains less than 7% by mass Fe with the remainder consisting of Zn, Al and unavoidable impurities. Thus, the high-strength hot dip galvanized steel plate of the invention has excellent moldability, weak material anisotropy and an ultimate tensile strength of 980 MPa or more.

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AZUMA MASAFUMI (JP)
WAKABAYASHI CHISATO (JP)
NOZAKI TAKAYUKI (JP)
FUJITA NOBUHIRO (JP)
TAKAHASHI MANABU (JP)

PCT/JP2012/075214

April 04, 2013

September 28, 2012

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NIPPON STEEL & SUMITOMO METAL CORP (JP)

C22C38/00; B21B3/00; C21D9/46; C22C18/04; C22C38/06; C22C38/58; C23C2/06; C23C2/12; C23C2/28

JP2009030159A	2009-02-12
JP2007284776A	2007-11-01
JP2007277661A	2007-10-25
JP3521851B2	2004-04-26
JPH0426720A	1992-01-29
JP3598087B2	2004-12-08
JP2004323970A	2004-11-18
JP2004315960A	2004-11-11
JP2008214752A	2008-09-18
JP2011111674A	2011-06-09
JP2009030159A	2009-02-12
JP2008163388A	2008-07-17
JPS59219473A	1984-12-10

MATSUMURA, GENTARO: "Cullity, Theory of X-ray diffraction", 1986, AGNE INC., pages: 274 - 296
See also references of EP 2762588A4

HAGIWARA, Yasushi et al. (JP)
Yasushi Hagiwara (JP)

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