Wire rod for high-strength and high-weather-resistant bolt, bolt and manufacturing method of wire rod

The invention discloses a high-strength and high-weather-resistance wire rod for a bolt, which contains Fe and inevitable impurity elements, and further contains the following chemical elements in percentage by mass: 0.15 to 0.25 percent of C, 0.01 to 2.0 percent of Si, 0.3 to 2.2 percent of Mn, 2.5 to 4.5 percent of Cr, 0.1 to 0.4 percent of Ni, 0.2 to 0.6 percent of Cu, 0.001 to 0.1 percent of Al, 0.01 to 0.5 percent of Ti, 0.01 to 0.5 percent of V, 0.010 to 0.045 percent of Re, and the balance of Fe. The mass percentage contents of Cr, C, Ni and Cu meet the conditions that Cr/C is greater than 10, and Ni/Cu is greater than 0.5. Correspondingly, the invention further discloses a manufacturing method of the wire rod for the high-strength and high-weather-resistant bolt, and the manufacturing method comprises the following steps: (1) smelting and casting; (2) heating; (3) wire rod rolling: high-speed wire rod rolling is carried out, the finish rolling temperature is 920-980 DEG C, and the high-speed wire rod