This paper focuses on the influence of reheating conditions on the hot duct
ility behavior of steel. Two types of hot ductility test were performed; (i
) the conventional 'isothermal' test, in which specimens were reheated, coo
led to the desired test temperature and then fractured; (ii) physical simul
ation of biller continuous casting, in which the specimens were subjected t
o thermal histories typical of the surface of a continuously cast biller, a
nd then fractured. Two reheat conditions were used, (i) reheating to the in
cipient melting temperature (IM), (ii) in-situ melting and solidification (
MS).
For the isothermal ductility, compared to the IM reheated specimens, the MS
reheat considerably decreased the hot ductility trough for the two steels
tested (a microalloyed Nb-Ti and a microalloyed Ti-B grade). For MS specime
ns, the majority of the physical simulations led to hot ductility values lo
wer than that predicted from the isothermally tested specimens. The opposit
e was observed for IM reheated specimens.