Masteel Applied For A Patent For Non-annealed Cold Heading Steel With A Long Service Life

On December 23, 2023, according to the announcement of the State Intellectual Property Office, Maanshan Iron and Steel Co., Ltd. applied for a project entitled "a non-annealable cold heading steel and its manufacturing method and fasteners obtained therefrom", public number CN117265408A, the application date is September 2023. The invention discloses a non-annealed cold heading steel and a manufacturing method thereof and a fastener obtained therefrom. The cold heading steel contains C, Si, Mn, Al, Cr, Mo, B and Mg, 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 make large deformation fasteners of 10.9 ~ 12.9 level, in addition, the cold heading steel has high purity, steel and fasteners have high fatigue performance, and has a long service life.