Abstract: The solidification in a beam blank was numerically simulated by using ANSYS commercial software in order to analyze surfacal and internal cracks in the beam blank. The boundary conditions were based on measured technical parameters in practical production. The simulated result is in accordance with the measured surface temperature of the beam blank. It is shown that the surfacal temperature of SS400 beam blank is in the brittleness temperature zone except that of the fillet under the present condition. In order to make the surface temperature of the beam blank into the plastic temperature zone before it goes into the straightening zone, it is necessary to weaken the intensity of secondary cooling.