| 简介 |
A steel product reduced in the amount of an alumina cluster, which is produced by a method comprising deoxidizing a molten steel by the use of Al, adding one or more rare earth elements (REM) selected from Ce, La, Pr and Nd to the deoxidized molten steel, followed by casting, characterized in that (a) an oxide inclusion containing alumina and a REM oxide as main components has a REM oxide content of 0.5 to 15 %% in terms of mass %% relative to the oxide inclusion, (b) the requirement (a) is satisfied and further the mass ratio of the total REM to the total oxygen : REM/T.O in the steel product is 0.05 to 0.5, or (c) the total amount of REM is not less than 0.1 ppm and less than 10 ppm and the amount of REM in the state of solid solution is less than 1 ppm.
© KIPO & WIPO 2007 |
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