发明名称 FIRE-RESISTANT STEEL MATERIAL SUPERIOR IN HIGH-TEMPERATURE STRENGTH OF BASE METAL AND HIGH-TEMPERATURE DUCTILITY OF WELD HEAT-AFFECTED ZONE, AND METHOD FOR MANUFACTURING THE SAME
摘要 PROBLEM TO BE SOLVED: To provide a fire-resistant steel material which shows high yield strength in each base metal part at 600°C, also has high ductility in a weld heat-affected zone, and is superior in the toughness of the base metal part and the weld heat-affected zone. SOLUTION: The fire-resistant steel material includes 0.005-0.050% C, 0.01-0.50% Si, 0.50-2.00% Mn, 0.50-2.00% Cr, 0.001-0.030% Ti, 0.005-0.10% Al, 0.001-0.006% N, less than 0.01% Mo, less than 0.03% V, 0.0003% or less B, less than 0.02% P, less than 0.01% S, less than 0.01% O and the balance Fe with unavoidable impurities; and has a steel material structure in which one or more of a bainite structure, a martensite structure or a ferrite structure formed of grains with circle equivalent grain sizes of 20μm or less when measured with a EBSP method occupy 80% or more by an area rate, and the balance is a ferrite or MA structure with unavoidable phases. COPYRIGHT: (C)2011,JPO&INPIT
申请公布号 JP2011190506(A) 申请公布日期 2011.09.29
申请号 JP20100057983 申请日期 2010.03.15
申请人 NIPPON STEEL CORP 发明人 MIZOGUCHI MASATAKE;HASEGAWA HIROSHI;YOSHIDA TAKU;UEMORI RYUJI;WATABE YOSHIYUKI
分类号 C22C38/00;B21B3/00;C21D8/02;C22C38/38;C22C38/58 主分类号 C22C38/00
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