The Influence of High Vanadium and Phosphorus Contents on the Risk of Transverse Cracking during the Continuous Casting of Austenitic TWIP Steels

There is considerable interest in improving the resistance of fully austenitic TWIP steels to hydrogen embrittlement; one potential route use V additions promote trapping by V(C,N) precipitates. This has dual benefit increasing yield strength through precipitation strengthening and grain refinement. However, effect on slab quality during continuous casting not been determined. In this study, hot ductility two twinning-induced plasticity (TWIP) steels, Fe-0.6C-22Mn Fe-0.6C-22Mn-0.2V, was examined over temperature range 650–1200 °C. Tensile samples were taken from cast 225 mm slabs 36 transfer bars. The addition caused trough 650–900 °C deepen widen lowest reduction area (RA) recorded as-cast condition 30%. deterioration due precipitation. Even though minimum RA below value often accepted avoid cracking, no transverse cracking observed industrial trials surface acceptable. values found be very sensitive P level. sensitivity less evident when added, possibly VC at austenite boundaries. No industrially produced with (0.02 0.04 wt.% P).