Method of producing steel and steel for the production of light structures

摘要

Steel sheet comprises (in wt.%) carbon (0.01-0.2), manganese (0.06-3), silicon (= 1.5), aluminum (0.005-1.5), phosphorous (= 0.04), titanium (2.5-7.2) and boron according to a formula given in the specification, optionally other elements such as nickel (= 1), molybdenum (= 1), chromium (= 3), niobium (= 0.1), vanadium (= 0.1) and iron and impurities (rest), where the impurities are unavoidable impurities resulting from elaboration. Independent claims are included for: (1) an object manufactured from the steel pieces of the same or different composition and thickness in which at least one of the steel pieces is the given steel sheet, welded together; (2) a manufacturing process comprising supplying steel compositions and casting the steel in the form of semi-finished product; and (3) production of structural parts, comprising cutting out a blank from a steel sheet or an object and deforming the blank at 20-900[deg] C.