PRODUCTION OF HOT-DIP ALUMINUM COATED AUSTENITIC STAINLESS STEEL SHEET REDUCED IN SENSITIVITY TO SENSITIZATION PHENOMENON

摘要

PURPOSE: To prevent the occurrence of sensitization phenomenon at the time of applying hot-dip metal coating to an austenitic stainless steel. ;CONSTITUTION: At the time of preannealing a starting sheet for plating, the cooling velocity (T°C/sec) at annealing is controlled so that, in the relationship with the amount of [C ]] contained in the starting sheet, it satisfies T=([C]-0.005)×(500 when 0.010[C%]≤0.020, T=([C]-0.005)×750 when 0.020[C%]≤0.040, and T=([C]-0.005)×(1000 when 0.040[C%]≤0.070, respectively. Further, holding time at the maximum heating temp. in a hot dipping stage is controlled so that it is ≤60sec when the maximum heating temp. is ≥800°C, ≤120sec when 700-800°C, ≤180sec when 600-700°C, and ≤240sec when 500-600°C, respectively.;COPYRIGHT: (C)1993,JPO&Japio