Abstract: Temperature-gradient double tension test, drop weight test and tensile test with standard circular cross-section specimens are conducted on Q500qE high-strength bridge steels. Crack arrest temperature CAT, nil-ductility transition temperature T_NDT, and yield strength R_el are obtained. A correlation formula is proposed to describe relationship between CAT, T_NDT, R_el and plate thickness t. The Deviation between the crack arrest temperature calculated by the proposed formula and that tested by double tension test is within ±5℃, indicating the validity of the proposed formula on describing correlation between crack arrest temperature, nil-ductility transition temperature, yield strength and plate thickness.