0.003 3N) were melted by 100 kg vacuum-induction furnace with respective adding V-N and V-Fe alloy
and rolled to 14 mm plate. Examination results showed that Added 0.019 0% N in steel 15MnVq obviously promoted V (C
N) precipitating and fined structure of steel
the yield and ultimate strength of steel increased respectively from 393 MPa and 578 MPa to 510 MPa and 660 MPa
and the impact energy AKV of steel at -20 °C increased from 21. 9 J to 101. 8 J; at same time the ageing sensitivity of steel 15MnVq obviously decreased by added N.