Continuous Casting Solidification Rules of Heavy rail Steel Bloom

A solidification heat transfer mathematical model of heavy rail steel bloom was established based on practical production conditions bloom continuous caster in No.1 steel-making plant of WISCO.Besides,it was tested and modified by pin-shooting technique.The results show that the final stage of solidification of U71Mn heavy rail steel is far 16.96～21.68 m from mold liquid level.With increasing 0.1 m/min casting speed,surface temperature and centre temperature of bloom increase obviously,and the final stage of solidification shifts 4.72 m backward.After adjusting the intensity of secondary cooling weakly,surface temperature of bloom increases clearly,but centre temperature of casting blank has no change obviously,and the final stage of solidification shifts 1.12～2.23 m forward.So,weak intensity of secondary cooling is more suitable for U71Mn heavy rail steel.