Abstract: The subject of the invention is a hot-rolled steel sheet with high strength and high drawability, whose composition, expressed in percentages by weight, is:C.ltoreq.0.12%;0.5.ltoreq.Mn.ltoreq.1.5%;0.ltoreq.Si.ltoreq.0.3%;0.ltoreq.P.ltoreq.0.1%;0.ltoreq.S.ltoreq.0.05%;0.01.ltoreq.Al.ltoreq.0.1%;0.ltoreq.Cr.ltoreq.1%;0.01.ltoreq.Nb.ltoreq.0.1%;0.ltoreq.Ti.sub.eff .ltoreq.0.05%, Ti.sub.eff being the content of titanium not in the form of nitrides, sulfides or oxides; and whose structure comprises at least 75% of ferrite hardened by precipitation of niobium or niobium and titanium carbides or carbonitrides, the remainder of the structure comprising at least 10% of martensite and possibly bainite and residual austenite. The subject of the invention is also processes for manufacturing such sheets.

Abstract: The subject of the invention is a hot-rolled steel sheet with high strength and high drawability, whose composition, expressed in percentages by weight, is:C.ltoreq.0.12%;0.5.ltoreq.Mn.ltoreq.1.5%;0.ltoreq.Si.ltoreq.0.3%;0.ltoreq.P.ltoreq.0.1%;0.ltoreq.S.ltoreq.0.05%;0.01.ltoreq.Al.ltoreq.0.1%;0.ltoreq.Cr.ltoreq.1%;0.03.ltoreq.Ti.sub.eff .ltoreq.0.15%, Ti.sub.eff being the content of titanium not in the form of nitrides, sulfides or oxides;0.ltoreq.Nb.ltoreq.0.05%; and whose structure comprises at least 75% of ferrite hardened by precipitation of Ti or Ti and Nb carbides or carbonitrides, the remainder of the structure comprising at least 10% of martensite and possibly bainite and residual austenite. The subject of the invention is also processes for manufacturing such sheets.