Abstract: A hot-rolled austenitic iron/carbon/manganese steel sheet, the strength of which is greater than 1200 MPa, the product P (strength (in MPa)×elongation at break (in %)) of which is greater than 65 000 MPa % and the nominal chemical composition of which comprises, the contents being expressed by weight: 0.85%?C?1.05%; 16%?Mn?19%; Si?2%; Al?0.050%; S?0.030%; P?0.050%; N?0.1%, and, optionally, one or more elements chosen from: Cr?1%; Mo?0.40%; Ni?1%; Cu?5%; Ti?0.50%; Nb?0.50%; V?0.50%, the rest of the composition consisting of iron and inevitable impurities resulting from the smelting, the recrystallized surface fraction of said steel being equal to 100%, the surface fraction of precipitated carbides of said steel being equal to 0% and the mean grain size of said steel being less than or equal to 10 microns.

Abstract: The invention relates to a method for producing a siderurgical product made of carbon steel having a high copper content, according to which: —a liquid steel having the composition: 0.0005%?1%; 0.5?Cu?10%; 0?Mn?2%; 0?Si?5% 0?Ti?0.5%; 0?Nb?0.5%; 0?Ni?5%; 0?Al?2%, the remainder being iron and impurities, is produced;—said liquid steel is poured directly in the form of a thin strip having a thickness of no more than 10 mm;—the strip is subjected to forced cooling and/or is surrounded by a non-oxidizing atmosphere while having a temperature of more than 1000? C.; —said thin strip is hot rolled at a reduction rate of at least 10%, the temperature at the end of the rolling process being such that all of the copper is still in a solid solution in the ferrite and/or austenite matrix;—and the strip is coiled. The invention also relates to a siderurgical product obtained according to said method.

Abstract: A hot-rolled austenitic iron/carbon/manganese steel sheet, the strength of which is greater than 1200 MPa, the product P (strength (in MPa)×elongation at break (in %)) of which is greater than 65 000 MPa % and the nominal chemical composition of which comprises, the contents being expressed by weight: 0.85%?C?1.05%; 16%?Mn?19%; Si?2%; Al?0.050%; S?0.030%; P?0.050%; N?0.1%, and, optionally, one or more elements chosen from: Cr?1%; Mo?0.40%; Ni?1%; Cu?5%; Ti?0.50%; Nb?0.50%; V?0.50%, the rest of the composition consisting of iron and inevitable impurities resulting from the smelting, the recrystallized surface fraction of said steel being equal to 100%, the surface fraction of precipitated carbides of said steel being equal to 0% and the mean grain size of said steel being less than or equal to 10 microns.

Abstract: The invention relates to a method for producing a siderurgical product made of carbon steel having a high copper content, according to which:—a liquid steel having the composition: 0.0005%?1%; O.5?Cu?10%; 0?Mn?2%; 0?Si?5% 0?Ti?0.5%; 0?Nb?0.5%; 0?Ni?5%; 0?Al?2%, the remainder being iron and impurities, is produced;—said liquid steel is poured directly in the form of a thin strip having a thickness of no more than 10 mm;—the strip is subjected to forced cooling and/or is surrounded by a non-oxidizing atmosphere while having a temperature of more than 1000? C.;—said thin strip is hot rolled at a reduction rate of at least 10%, the temperature at the end of the rolling process being such that all of the copper is still in a solid solution in the ferrite and/or austenite matrix;—and the strip is coiled. The invention also relates to a siderurgical product obtained according to said method.

Abstract: The invention relates to a process for producing strip made of an iron-carbon-manganese alloy, in which: a thin strip, having a thickness of 1.5 to 10 mm, is cast directly on a casting machine from a liquid metal of composition, in percentages by weight: C ranging between 0.001 and 1.6%; Mn ranging between 6 and 30%; Ni≦10% with (Mn+Ni) ranging between 16 and 30%; Si≦2.5%; Al≦6%; Cr≦10%; (P+Sn+Sb+As)≦0.2%; (S+Se+Te)≦0.5%; (V+Ti+Nb+B+Zr+rare earths)≦3%; (Mo+W)≦0.5%; N≦0.3%; Cu≦5%, the balance being iron and impurities resulting from the smelting; the said strip is cold rolled with a reduction ratio ranging between 10 and 90% in one or more steps; and the said strip undergoes recrystallization annealing. The invention also relates to a strip that can be produced by this process.