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The fire process of large-size storage tank is simulated by the heat treatment for the steel SPV490.The relationship between mechanical properties of large-size storage tank after fire and heating temperatures,holding time,cooling modes is obtained.The mechanical properties of the steel SPV490 is studied through tensioning at 25℃\400℃ \500℃\600℃\700℃\800℃\900℃ in water cooling or air cooling by the electronic tensile testing machine.The mechanical properties such as yield strength,tensile strength and elongation at different temperatures are obtained by analysis.