Baosteel Applied For A Bolt Patent, Which Can Provide High Strength And High Weather Resistance

On December 22, 2023, according to the announcement of the State Intellectual Property Office, Baoshan Iron and Steel Co., Ltd. applied for a project entitled "A high-strength and high-weather bolt wire rod, bolt and its manufacturing method", public number CN117265378A, the application date is June 2022. The patent abstract shows that the invention discloses a wire rod with high strength and high weather resistance for bolts, which contains Fe and unavoidable impurity elements, and also contains the following chemical elements with mass percentage content as follows: C: 0.150.25%, Si: 0.012.0%, Mn: 0.32.2%, Cr: 2.54.5%, Ni: 0.10.4%, Cu: 0.20.6%, Al: 0.0010.1%, Ti: 0.010.5%, V: 0.010.5%, Re: 0.0100.045%; And the mass percentage content of Cr, C, Ni and Cu meets: Cr/C > 10, Ni/Cu > 0.5. Accordingly, the invention also discloses a manufacturing method of the wire rod for the high strength and high weather resistance bolt, which comprises steps: (1) smelting and casting; (2) Heating; (3) Wire rolling: high wire rolling, the final rolling temperature is 920 ~ 980℃, high wire spinning temperature is 880 ~ 920℃; (4) Stellmore fan cooling. In addition, the invention also discloses a bolt prepared by tempering the high strength and high weather resistance bolt with a wire rod.