| 摘要 |
An austenitic steel sheet excellent in resistance to delayed cracking, th e composition of said steel comprising, in weight: 0,35% < C < 1,05%,1 5%< 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, titani um, niobium, molybdenum, chromium:0,050% <V < 0,50%, 0,040% <=Ti &l t; 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 <0,0 10%, Ni < 2%, Cu < 5%,the remainder being iron and unavoidable impurit ies inherent to fabrication, including hydrogen, the quantity Xp of said at least one metallic element under the form of carbides, nitrides or carbonitr ides being, in weight : 0,030% <VP < 0,40%, 0,030%<Tip < 0,50%, 0,040% < Nbp < 0,40%, 0,14%<Mop < 0,44%, 0,070% <Crp< 0,6% , the hydrogen content Hmax designating the maximal hydrogen content that ca n be measured from a series of at least five specimens, and the quantity Xp, in weight, being such that (I) <3,3. |
