Steel product made from lightweight structural steel containing manganese with a high energy absorption capacity in the event of sudden loads and low temperatures and the process for its manufacture

摘要

The invention relates to a steel product made of lightweight structural steel containing manganese with a minimum impact energy at -40 ° C in the transverse direction of ≥ 30 J with the following chemical composition in% by weight: C: 0.1 to 1.8, preferably 0.3 to 1, 5; Mn: 20 to 35, preferably 25 to 30; AI: 6 to 12, preferably 7 to 10; Si: 0.2 to 1.5, preferably 0.5 to 1.2; Mo: 0.1 to 1.2, preferably 0.5 to 1.1; V: 0.05 to 0.5, preferably 0.07 to 0.3; Nb: 0.05 to 0.5, preferably 0.08 to 0.3; Cr: 0.05 to 3, preferably 0.1 to 2; Ni: 0.05 to 3, preferably 0.1 to 2; P: 0.04; S: 0.02; N: 0.02; The remainder iron including unavoidable steel-accompanying elements, with the optional addition of one or more of the following elements: Ti, Cu, B, Co, W, Zr, Ca and Sn, having a structure consisting of at least 40 vol .-% austenite, less than 60 Vol .-% ferrite, the remainder martensite and / or carbides up to 2%, consisting of kappa carbides and / or vanadium and / or niobium and / or molybdenum carbides with a good combination of strength, elongation and deformation properties . The invention also relates to a method for producing a steel product in the form of a flat steel product from the aforementioned manganese-containing lightweight steel.