Influence mechanism and process improvement of boron on hot rolled ultra-low carbon strip tail swing
Aiming at the problem of tail swinging of boron-containing ultra-low carbon steel in the process of finishing rolling,the influence mechanism of boron on tail swinging of hot rolled ultra-low carbon strip was analyzed,and the improvement measures were put forward.The results show that in ultra-low carbon steel,although the addition of trace boron has no obvi-ous effect on the high temperature strength of austenitic zone and the beginning temperature of the phase transition of preeu-tectoid ferrite,it hinders the movement of ferrite grain boundaries,reduces the high temperature plasticity of ferrite,and eas-ily generates micropores or even cracks in the ferrite phase under high stress conditions.Therefore,during the plastic deform-ation process,it is easy to cause uneven extension during rolling in two-phase or ferrite zone,which increases the instability of hot strip finishing rolling process.By increasing the final rolling temperature and the uniformity of the cross section tempera-ture of the strip,reducing the strain degree of the back frame,adjusting the chemical composition and so on,the tail swinging phenomenon of the ultra-low carbon steel with boron has been effectively controlled.
boron elementultra-low carbon steelfinishing rollingtail swingingferriterolling temperaturehigh temperature plas-ticity
NETL
NSTL
万方数据
