| 摘要 |
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</=0.12%; 0.5</=Mn</=1.5%; 0</=Si</=0.3%; 0</=P</=0.1%; 0</=S</=0.05%; 0.01</=Al</=0.1%; 0</=Cr</=1%; 0.03</=Tieff </=0.15%, Tieff being the content of titanium not in the form of nitrides, sulfides or oxides; 0</=Nb</=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.
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