| 20080213121 | Steel For Submarine Hulls With Improved Weldability - The invention relates to a steel for the production of submarine hulls, which is characterised in that the chemical composition thereof comprises, by weight percent: 0.03%≦C<0.08%; 0.04%≦Si≦0.48%; 0.1%≦Mn≦1.4%; 2%≦Ni≦4%; Cr≦0.3%; 0.3%≦Mo+W/2+3(V+Nb/2+Ta/4)≦0.89%; Mo≧0.15%; V+Nb/2+Ta/4≦0.004%; Nb≦0.004%; Cu≦0.45%; Al≦0.1%; Ti≦0.04%; N≦0.03%; the remainder comprising iron and impurities resulting from production, boron being an impurity with a concentration of less than 0.0005% and P+S≦0.015%, the chemical composition satisfying condition 410≦540×C | 09-04-2008 |
