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SynopsisA continuous annealing heat cycle is established Jor manuJacture oj drawing quality cold rolled low-carbon capped steel strip . Th e heat cycle is composed oj the recrystallization treatment, rapid cooling incorporating water quenchillg and subsequent over-aging treatment. Slifficient overaging can be realized ill less thall 1 min ky virtue oj the rapid cooling, ill contrast to the past resulls in which an over-aging lime q( 30 min to I hr is invariably lIecessary.A waler quellchillg lechllique is developed to realize Ihe pro/losed heOl C)'cle. Soulld as-quenched slrip shape call be secured by means oj sheet waler spray that washes away Ihe vapor film Jorming on the strip surface; the cause oj Ihe shape deterioratioll is 1I01/-ulli(orm adherence and disapperarance oj the vapor film. Illfluence tif the spray no z zle arrangemellt and opera ting cOllditions such as the 1I0zzle header pressure, water temperatllre al/d slrip travellillg speed are clarified.

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