Title:
加工性、溶接性および疲労特性に優れる高強度溶融亜鉛めっき鋼板およびその製造方法
Document Type and Number:
Japanese Patent JP4924730
Kind Code:
B2
Abstract:
A high strength galvanized steel sheet having excellent formability, weldability, and fatigue properties and a tensile strength equal to or higher than 980 MPa and a method for manufacturing the same. The steel sheet contains all in mass%, C: 0.05% to <0.12%, Si: 0.35% to <0.80%, Mn: 2.0 to 3.5%, P: 0.001 to 0.040%, S: 0.0001 to 0.0050%, Al: 0.005 to 0.1%, N: 0.0001 to 0.0060%, Cr: 0.01% to 0.5%, Ti: 0.010 to 0.080%, Nb: 0.010 to 0.080%, and B: 0.0001 to 0.0030%, optionally one or more of Mo: 0.01 to 0.15%, Ca: 0.0001 to 0.0050%, REM: 0.0001 to 0.1%, and Sb: 0.0001 to 0.1%, and Fe and unavoidable impurities as the balance, has a microstructure containing a ferrite phase with a volume fraction in a range of 20 to 70% and an average grain diameter equal to or smaller than 5 µm, and has a galvanized layer on a surface thereof at a coating weight (per side) of 20 to 150 g/m 2 .
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Inventors:
High Shu Shu
Kohei Hasegawa
Kohei Hasegawa
Application Number:
JP2010038216A
Publication Date:
April 25, 2012
Filing Date:
February 24, 2010
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
C22C38/00; C21D9/46; C22C38/38; C22C38/60; C23C2/06; C23C2/28; C23C2/40
Domestic Patent References:
| JP2008280608A | ||||
| JP2002256386A | ||||
| JP2005105367A | ||||
| JP2004211140A | ||||
| JP2004292881A |
Attorney, Agent or Firm:
Masaki Okui
Satoru Matsumoto
Satoru Matsumoto