| 摘要 |
PROBLEM TO BE SOLVED: To provide a 9% Ni steel having brittle crack propagation arresting properties more excellent than those of a Q-T material and having excellent strength and low temperature toughness, and a method for economically and stably producing the same.SOLUTION: The 9% Ni steel having excellent strength, low temperature toughness and brittle crack propagation arresting properties has a composition comprising, by mass, 0.03 to 0.10% C, 0.02 to 0.40% Si, ≤0.005% P, ≤0.005% S, 0.2 to 1.0% Mn, 8.5 to 9.5% Ni and 0.01 to 0.10% Al, and the balance Fe with inevitable impurities, and comprises retained austenite of 2.0 to 6.0% by volume, and in which the integration degree of the {110} texture in the face parallel to the surface of the steel sheet is ≥1.2 in the range of 3 mm from the surface of the steel sheet, and the integration degrees of the {100} and {211} textures in the faces parallel to the surface of the steel sheet are ≥1.2 to 3.0, respectively in the central part of the sheet thickness of the steel sheet. |
