| 摘要 |
An austenitic steel sheet excellent in resistance to delayed cracking, the composition of said steel comprising, in weight: 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 vanadium, titanium, niobium, molybdenum, chromium:0,050% < V < 0,50%, 0,040% <= Ti < 0,50%, 0,070% < Nb < 0,50%, 0,14%<Mo < 2%, 0,070% <Cr < 2 % and optionally, one or several elements chosen among 0,0005% <B <0,010%, Ni < 2%, Cu < 5%, the remainder being iron and unavoidable impurities inherent to fabrication, including hydrogen, the quantity X p of said at least one metallic element under the form of carbides, nitrides or carbonitrides being, in weight: 0,030% <V p < 0,40%, 0,030%<Ti p < 0,50%, 0,040% < Nb p < 0,40%, 0,14%<Mop < 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 (see above formula) |
