PROCESS FOR MANUFACTURING IRON-CARBON-MANGANESE AUSTENITIC STEEL SHEET WITH EXCELLENT RESISTANCE TO DELAYED CRACKING, AND SHEET THUS PRODUCED

摘要

Austenitic steel sheet excellent in resistance to delayed cracking, the composition of said steel comprising 0.35% ≤ C ≤ 1.05%, 15% ≤ Mn ≤ 26%, Si ≤ 3%, Al ≤ 0.050%, S ≤ 0.030%, P ≤ 0.080%, N ≤ 0.1%, at least one metallic element X chosen among 0.050% ≤ V ≤ 0.50%, 0.040% ≤ Ti ≤ 0.50%, 0.070% ≤ Nb ≤ 0.50%, 0.14% ≤ Mo ≤ 2%, 0.070% ≤ Cr ≤ 2%, the quantity X_p of said at least one metallic element under the form of carbides, nitrides or carbonitrides being 0.030% ≤ V_p ≤ 0.40%, 0.030% ≤ Ti_p ≤ 0.50%, 0.040% ≤ Nb_p ≤ 0.40%, 0.14% ≤ Mo_p ≤ 0.44%, 0.070% ≤ Cr_p ≤ 0.6%, the hydrogen content H_max designating the maximal hydrogen content that can be measured from a series of at least five specimens, and the quantity X_p, in weight, being such that: $1000\frac{H_{\mathit{max}}}{X_P}\le \mathrm{3.3.}\mathop{\mathrm{image}}$