| 摘要 |
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.
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