HOT-PRESSED STEEL SHEET MEMBER, METHOD OF MANUFACTURING SAME AND STEEL SHEET FOR HOT PRESSING Russian patent published in 2018 - IPC C22C38/14 C21D9/46 B21D22/20 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, in particular to a hot-pressed steel sheet member. Said sheet member has a chemical composition, including, wt %: C: 0.10 to 0.24, Si: 0.001 to 2.0, Mn: 1.2 to 2.3, soluble Al: 0.001 to 1.0, Ti: 0.060 to 0.20, P: 0.05 or less, S: 0.01 or less, N: 0.01 or less, Nb: 0 to 0.20, V: 0 to 0.20, Cr: 0 to 1.0, Mo: 0 to 0.15, Cu: 0 to 1.0, Ni: 0 to 1.0, Ca: 0 to 0.01, Mg: 0 to 0.01, REM: 0 to 0.01, Zr: 0 to 0.01, B: 0 to 0.005, Bi: 0 to 0.01, balance: Fe and impurities. Microstructure of the steel member includes, in parts of the area: ferrite: from 10 to 70 %, martensite: 30 % to 90 %, wherein total area of ferrite and martensite is from 90 to 100 %, and, optionally, at least one of bainite, residual austenite, cementite and perlite. Tensile strength of hot-pressed steel sheet member is 980 MPa or more, and 90 % or more of all Ti in the steel is contained in the form of inclusions.

EFFECT: high strength and ductility.

10 cl, 1 dwg, 1 ex, 3 tbl