BLISTERING AND HYDRAULIC REMOVABILITY OF SCALE FILMS OF RIMMED STEEL AT HIGH TEMPERATURE.

Abstract

Blisters caused by compressive stresses such as oxide growth stress and thermally induced stress are small round spots at first, and grow rapidly. The periods from the start of oxidation to the appearance of blisters are measured. The removability of scale films is measured by water jet of 1, 4 and 15 kg/cm**2. Scale films are removed readily. The cohesion or adhesion of scale films at high temperature is discussed.