公开(公告)号：EP1374655A2

公开(公告)日：2004-01-02

申请号：EP01271458.0

申请日：2001-12-19

申请人： Posco ,  RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY

发明人： LEE, Jae-Young,Res. Inst. Indu. Sci. & Technology ,  KIM, Eel-Young,c/o Pohang Iron & Steel Co. Ltd. ,  SOHN, Jin-Gun,Res. Inst. Indu. Sci. & Technology ,  CHO, Noi-Ha,c/o Pohang Iron & Steel Co. Ltd. ,  KWAK, Young-Jin,c/o Pohang Iron & Steel Co. Ltd. ,  KWON, Soon-Joo ,  KIM, Yong-Min,c/o Pohang Iron & Steel Co. Ltd. ,  LEE, Jung-Sik,c/o Pohang Iron & Steel Co. Ltd.

IPC分类号： H05K9/00

CPC分类号： C22C38/02 ,  A01N59/06 ,  A01N59/16 ,  B05D7/14 ,  B05D2601/20 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0278 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1277 ,  C22C38/008 ,  C22C38/04 ,  C22C38/06 ,  C22C38/16 ,  C23C2/02 ,  C23C2/06 ,  C23C2/26 ,  C23C28/00 ,  Y10S428/935 ,  Y10S428/939 ,  Y10T428/12556 ,  Y10T428/12569 ,  Y10T428/1259 ,  Y10T428/12611 ,  Y10T428/12799 ,  Y10T428/12965 ,  Y10T428/12972 ,  Y10T428/12979 ,  Y10T428/12986 ,  Y10T428/25 ,  Y10T428/252 ,  Y10T428/258 ,  Y10T428/26 ,  Y10T428/31678

摘要： Disclosed are a steel plate and a hot-dip galvanized steel plate, superior in terms of high electromagnetic shield capacity. The steel plate is prepared from a composition comprising C, N and S in an amount of 0.150 % by weight or less in total; Mn in an amount of 0.1 to 1.0 % by weight; Si in an amount of 0.5 % by weight or less; Al in an amount of 1.0 % by weight or less; P in an amount of 0.06 % by weight or less; and Fe for the remainder, and inevitable elements, and shows a yield strength of 18 kg/mm2 or higher, and an elongation of 40 % or higher. The hot-dip galvanized steel plate is prepared from a composition comprising C, N and S in an amount of 0.0150 % by weight or less in total; Mn in an amount of 0.2 to 0.8 % by weight; Al in an amount of 0.6 % by weight or less; Si in an amount of 0.4 % by weight or less; P in an amount of 0.06 % by weight or less, with the proviso that the sum of Mn, Al, Si and P amounts to 0.2∼1.0 % by weight; and Fe for the remainder, and inevitably present elements. In addition to having high yield strength, the hot-dip galvanized steel plate is resistant to corrosion owing to the coating of a corrosion-resistant element on the surface.