連続焼鈍缶用鋼板の耐フルーティング性を支配する冶金的因子

抄録

Effects of annealing temperature and primary cooling rate in continuous annealing on the fluting resistance of soft temper tinplate were experimentally investigated. Based on its result, the influence of grain size, solute carbon and carbide morphology affecting the fluting resistance was studied. Main results are the following:
The more rapid the cooling rate is and the higher the annealing temperature is, the better the fluting resistance is improved. However, the dependency of the fluting resistance on cooling rate becomes small with the annealing temperature. Therefore, high temperature annealing is most effective and rapid cooling is second most effective to keep the fluting resistance acceptable under the normal reduction rate of temper rolling. These results mean that coarsening of grains is most effective, and the reduction of solute carbon is second most effective especially in the case of insufficient grain coarsening. Materials with fine and dispersed morphology of carbide show better fluting resistance than those with aggregated carbide on grain boundaries even if the grain size and solute carbon content are the same with each other.