| 摘要 |
PURPOSE: Provided is a method of manufacturing steel plate having TiN and TiO for welded structures, such as construction, a bridge, shipbuilding, a sea structure, a line pipe, a steel pipe and the like. CONSTITUTION: The method of manufacturing steel plate to be precipitating TiN and TiO for welded structures comprises the steps of: preparing steel slab composed of C:0.03-0.17%. Si:0.01-0.5%, mn:0.4-2.0%, Ti:0.005-0.2%, Al:0.0005-0.1%, N:0008-0.030%, B:0.0003-0.01%, W:0.001-0.2%, P:0.03% or less, S: 0.035 or less, O:0.001-0.006% and a balance of Fe and other impurities(2<=Ti/N<=2.5, 10<=N/B<=40, 2.5<=Al/N<=7, 6.5<=(Ti+2Al+4B)/N<=14, 4<=Ti/O<=10); heating the steel slab at 1100-1250 deg.c for 60-180 minutes; performing hot rolling mill therewith; and cooling it.
|
