According to news from the financial industry on December 22, 2023, according to the announcement of the State Intellectual Property Office, Baoshan Iron and Steel Co., Ltd. applied for a project called "A wire rod and bolt for high-strength and high-weather-resistant bolts and their manufacturing method", Publication No. CN117265378A , the application date is June 2022.

The patent abstract shows that the invention discloses a wire rod for high-strength and high-weather-resistant bolts, which contains Fe and inevitable impurity elements, and also contains the following chemical elements in the following mass percentages: C: 0.15-0.25%, Si: 0.01‑2.0%, Mn: 0.3‑2.2%, Cr: 2.5‑4.5%, Ni: 0.1‑0.4%, Cu: 0.2‑0.6%, Al: 0.001‑0.1%, Ti: 0.01‑0.5%, V : 0.01-0.5%, Re: 0.010-0.045%; and the mass percentages of Cr, C, Ni and Cu satisfy: Cr/C>10, Ni/Cu>0.5. Correspondingly, the present invention also discloses a method for manufacturing the above-mentioned wire rod for high-strength and high-weather-resistant bolts, which includes the steps: (1) smelting and casting; (2) heating; (3) wire rolling: high-wire rolling is performed, The final rolling temperature is 920~980℃, and the high-line spinning temperature is 880~920℃; (4) Stelmo fan cooling. In addition, the invention also discloses a bolt made by subjecting the above-mentioned high-strength and high-weather-resistant bolt wire rod to quenching and tempering treatment.