A kind of device is used to cool down and guide that the castor (10) of beam blank (12) curved secondary cooling zone beam blank (24) to include inner arc instant web supporter roller (46) and cylindrical bearing surface (64) are the methods interrupted by groove, including for example multiple axially-spaced annular grooves (66). The groove refers to that being designed to generate cooling water to avoid spilling stops up the intrados instant web supporter roller (46) at high rear by guiding channel (12) of enough cooling waters in intrados instant web supporter roller (46) axially across intrados beam blank (42). It has found that this cooling water overflow can generate intrados tip (52,52, the ') flange (16 ", 16 ") being quenched really, these tips of generation transverse crack are in aligning beam blank (12) in this way.
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