| 摘要 |
PURPOSE: An ultra thick steel plate for a pressure container with the excellent low temperature toughness and tensile property and a manufacturing method thereof are provided to supply the ultra thick steel plate for the pressure container which has more than 500MPa of tensile strength, and more than 25% of thickness contraction percentage. CONSTITUTION: An ultra thick steel plate for a pressure container with the excellent low temperature toughness and tensile property is composed of, in wt%: C: 0.1-0.3; Si: 0.15-0.5; Mn: 0.6-1.2; Al: 0.001-0.05; Cr: 0.01-0.35; Mo: 0.005-0.2; V: 0.005-0.05; Nb: 0.001-0.05; Ti: 0.001-0.05; Ca: 0.0005-0.005; P: 0.035 or less; S: 0.020 or less; Cu+Ni+Cr+Mo<=1.5; Cr+ Mo<=0.4; V+ Nb<=0.1; Ca/S>=1.0; and the remainder Fe and other inevitable impurities. The ultra thick steel plate has 0.25 or less of the banding index. |
