The Influence of Composition on the Hot Ductility of Steels and to the Problem of Transverse Cracking.

A review of the literature has been made, concentrating on the influence of N, V, Ti and the residuals, Cu, Sn, S and P, on the hot ductility of steels. Nitrogen is generally detrimental to ductility in Al containing and microalloyed steels; to avoid transverse cracking the N levels should be kept as low as possible. When Ti additions are made to low N, C-Mn-Al steels, (0.005 % N) the best ductility is likely to be given by a high Ti : N ratio of 4-5 : 1. For high N steels (0.01 % N), a low Ti level (0.01 %) is recommended to reduce the volume fraction of Ti containing particles, but allow precipitation to occur at high temperatures.…