| 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%‰ 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 |
