Abstract
In this thesis, mechanical properties of 0.3Ni and 3Ni low-temperature steel materials at low temperature were measured via tensile test and impact toughness test at low temperature, and applicable temperatures at low temperature of two new materials for iron tower were researched. The result shows that the strength of 0.3Ni steel is much higher than that of 3Ni steel, while the plasticity of 3Ni steel is better than that of 0.3Ni steel; the ductile-brittle transition temperature of steel material for power transmission iron tower is defined with impact energy 21J, then the ductile-brittle transition temperature of 0.3Ni low-temperature steel is about -70°C, and that of 3Ni low-temperature steel is about -120°C. With regard to steel using for power transmission iron tower under extremely low temperature conditions in our country, it is suggested that 0.3Ni low-temperature steel should be adopted in cold areas with temperature lower than -60°C.
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