METHOD OF MANUFACTURE OF STEEL PLATES FROM LOW-ALLOY AND CARBON STEELS DESIGNED FOR MANUFACTURE OF VESSELS

FIELD: metallurgy; production of low-alloy steel plates; manufacture of reservoirs-tanks working under pressure and used for carrying gas-lubricating materials. ^ SUBSTANCE: proposed method enhances impact toughness at temperature of minus 60C and smooth distribution of properties over square area of rolled product as determined by the following ratio: delta0.2/delta80.80 at retained strength and ductility characteristics. Prior to rolling, slabs are heated to temperature above Ac3 and roughing is performed at temperature of 950-890C at total cogging no less than 60% and no less than 20% per pass; then, slabs are cooled down to temperature of 84010C and are subjected to finish rolling to temperature of 78010C at total cogging no less than 50% and particular cogging cycles no less than 7% per pass, after which fast cooling is carried out at rate no less than 60C/min from temperature of end of rolling to temperature of 300-200C at further cooling of sheets in air to temperature of 100C at single-row location in racks. ^ EFFECT: enhanced impact toughness. ^ 2 tbl, 1 ex