Reaming steel and preparation method thereof

The invention relates to the technical field of hot-rolled pickling strip steel preparation processes, in particular to chambering steel and a preparation method thereof. The broaching steel has the tensile strength of 800 MPa or above and comprises the following chemical components of C, Mn, P, S, Cr, Nb, Mo, N, Ti, Al, Si and the balance Fe and inevitable impurities. The content of Si is less than or equal to 0.2 wt%; and the content of Al is 0.3 wt% to 1 wt%. The microcosmic metallographic structure of the chambering steel is ferrite and bainite, the volume fraction of the bainite is 25-45%, the tensile strength of the chambering steel is larger than or equal to 800 MPa, the tensile fatigue limit (R =-1) FL is larger than or equal to 380 MPa, the chambering rate lambda is larger than or equal to 60%, and the ductility A80 is larger than or equal to 14%. The problem that in the prior art, the chambering performance and the fatigue performance of chambering steel of 800 MPa or above are poor is solved. 本申请涉及