Patent ID: 8197746

Claim:
A method of arranging and setting spray nozzles of a processing and cooling apparatus provided with a plurality of pairs of constraining rolls for constraining and processing hot steel plate and provided with one or more lines of spray nozzles, able to control the amounts of cooling water sprayed, between said plurality of pairs of constraining rolls, wherein each said line comprises a plurality of spray nozzles and is disposed perpendicular to the processing direction, said method characterized by arranging and setting the spray nozzles so that a distribution of values ∫P n between two edges of the steel plate in the direction perpendicular to processing is not less than 80% of its highest value, wherein P is an impact pressure of the cooling water on the cooling surface, ∫P n is the value of n power of P integrated in the processing direction between said pairs of constraining rolls, and 0.05≦n≦0.2.