A method of reducing cold start two thick slab head stock Laid scrap judgment Rate

A method of reducing cold start two thick slab head stock Laid judge waste rate belongs steelmaking - continuous casting Field for continuous casting of slab thickness size range 300 ~ 600mm, a width size in the range of 1600 ~ 3000mm. In the open casting casting, die head into the cooled first two secondary cooling zone (1) to fifth secondary cooling zone (5), are two traditional cold start-up mode, i.e., the starting position of the blank head into the area time, the district opened two cold water. After the blank first enters the sixth secondary cooling zone (6), when the blank area of ​​the head into the starting position, the water does not immediately open the area, but when the traveling distance of the first blank in the region of 1-5m after , two cold water opening region, the sixth secondary cooling zone (6) from the initial position a distance between the mold catchy 7-10m, seventh secondary cooling zone (7) to fourteenth secondary cooling zone (14) both sixth secondary cooling zone (6) in the same manner as the secondary cooling water open; head to reduce the strength of the preform is cooled by this method, the blank first straightening improve high temperature thermoplastic and temperature, thereby reducing the surface due to generation of blank head transverse cracks caused by sentenced to waste the chance. Advantageously, the process is easy to implement.