Abstract: Transverse cracking resistance is generally displayed in low-C low-N microalloyed steels,but not in microalloyed steels with higher C levels. This paper discusses hot ductility work and commercial experience concerning V microalloyed steels with C levels between 0.05%~0.6 %. These V additions reduce transverse cracking susceptibility in steels with varying carbon content provided the [V][N] product does not exceed about 1 × 10^-3. The combination of Nb and V enhances hot ductility in the critical unbending temperature range of 800~900 ℃. This improvement is due to a combination of V and Nb slowing down the dynamic precipitation process. In Ti-bearing steels,initial,high-temperature Ti N formation has the additional benefit of encouraging Ti Nb (C,N) precipitate coarsening and reducing the volume fraction of fine Nb V precipitation which are detrimental to ductility. Recent results on the hot ductility of TWIP steels as well as industrial experience in continuous casting of V-microalloyed steels is presented.