| 摘要 |
PURPOSE: A high strength steel plate for a reactor container and a manufacturing method thereof are provided to be used in atomic power plant more than 1000MW class by increasing the tensile strength of the steel material. CONSTITUTION: A steel material for high tensile deep drawing with a superior low temperature toughness is as follows. The steel slab is re-heated in 1000~1250°C. The steel slab be rolling-finished in 750~1000°C. The steel slab is sphere and heat treats made after normalizing at a temperature of Ac1~Ac3. The steel slab is made of C: 0.03~0.20%, Si: 0.15~0.55%, Mn: 0.9~1.5%, Al: 0.001~0.05%, P: less than 0.030%, S: less than 0.030%, Cr: less than 0.30%, o: less than 0.2%, Ni: less than 0.6%, V: less than 0.07%, Nb: less than 0.04%, Ca: 5~50ppm, Ti: 0.005~0.025%, N: 0.0020~0.0060%, and B: 0.0005~0.0020%. The impurity which is inevitable the remnant Fe and others is included.
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