| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel containing little Al, which has high cleanliness in spite of containing Al in a small amount of 0.004 to 0.01% for securing high weldability and superior toughness. SOLUTION: The steel containing little Al and having the high cleanliness has a chemical composition comprising 0.0015 to 0.8% C, 0.01 to 0.8% Si, 0.1 to 2% Mn, 0.01 to 11% Ni and Cr in total, 0.004 to 0.01% Al, 0.0025% or less O, less than 0.0035% B, less than 0.1% Nb, less than 0.015% P, less than 0.0035% S, and the balance Fe with impurities; and contains inclusions which comprise, by mass%, 1 to 12% SiO<SB>2</SB>, and the balance one or more oxides of Al oxide and an Mn oxide. COPYRIGHT: (C)2009,JPO&INPIT
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