STEEL HAVING EXCELLENT TOUGHNESS IN WELD HEAT-AFFECTED ZONE AND MANUFACTURING METHOD THEREFOR

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PROBLEM TO BE SOLVED : To provide a steel having excellent toughness in the weld heat-affected zone, and to provide a manufacturing method therefor. SOLUTION : The steel has a composition comprising, by mass, 0.01 to 0.2% C, ≤0.5% (excluding 0%) Si, ≤2.5% (excluding 0%) Mn and ≤0.01% (excluding 0%) N, satisfying ≤0.02% (including 0%) P, ≤0.015% (including 0%) S and ≤0.01% (including 0%) Al, further comprising 0.001 to 0.1% rare earth metals and/or 0.0003 to 0.02% Ca, and 0.001 to 0.05% Zr, respectively, and also comprising the oxide of rare earth metals and/or Cao, and ZrO2. COPYRIGHT : (C)2007, JPO&INPIT