Masteel Shares Apply For A New Patent, Annealing Free Cold Heading Steel Has A Long Service Life

On January 16, 2024, according to the announcement of the State Intellectual Property Office, Maanshan Iron and Steel Co., Ltd. applied for a project entitled "A High cold heading performance and high plasticity of non-annealable cold heading steel and its manufacturing method and fasteners", public number CN117403127A, the application date is September 2023. The invention discloses a non-annealed cold heading steel with high cold heading performance and high plasticity and its manufacturing method and fastener. The cold heading steel contains C, Si, Mn, Al, B, Mg and Pr, and the metallographic structure is ferrite + degraded pearlite. The hot rolled rod of the cold heading steel has low strength, high plasticity and high cold heading performance, and no nodular annealing treatment is required. It can be directly drawn and cold heading into large deformation fasteners, with excellent drawing and cold heading performance, and can produce large deformation fasteners of 8.8 ~ 9.8 grade. In addition, the cold heading steel has high purity, steel and fasteners have high fatigue performance, and has a long service life.