| 摘要 |
<p>The invention relates to steel blanks having the following composition :
Carbon : 0.35-0.43,
Maganese : <0.20,
Silicon : <0.20,
Nickel : 3.00-4.00,
Chrome :1.30-1.80,
Molybdenum : 0.70-1.00,
Vanadium : 0.20-0.35,
Iron : balance
in percentages by weight of the total composition, as well as the inevitable impurities including nitrogen <70ppm, oxygen <30ppm and dihydrogen <2ppm. The invention relates in particular to a steel blank manufactured by electroslag remelting (ESR - ElectroSlag Remelting) or vacuum arc remelting (VAR - Vacuum Arc Remelting) to obtain very good mechanical properties. The blanks obtained can be used especially in the field of the manufacture of pressurised equipment elements and especially cannon tubes.</p> |
